Using nullptr in locations where warning disable is not convenient. (#6313, #4537)

backends/imgui_impl_glfw.cpp

@@ -331,7 +331,7 @@ static int ImGui_ImplGlfw_TranslateUntranslatedKey(int key, int scancode)
     const char* key_name = glfwGetKeyName(key, scancode);
     glfwSetErrorCallback(prev_error_callback);
 #if GLFW_HAS_GETERROR && !defined(__EMSCRIPTEN__) // Eat errors (see #5908)
-    (void)glfwGetError(NULL);
+    (void)glfwGetError(nullptr);
 #endif
     if (key_name && key_name[0] != 0 && key_name[1] == 0)
     {
@@ -573,7 +573,7 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
 #endif
     glfwSetErrorCallback(prev_error_callback);
 #if GLFW_HAS_GETERROR && !defined(__EMSCRIPTEN__) // Eat errors (see #5908)
-    (void)glfwGetError(NULL);
+    (void)glfwGetError(nullptr);
 #endif
 
     // Chain GLFW callbacks: our callbacks will call the user's previously installed callbacks, if any.
@@ -583,7 +583,7 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
     // We intentionally do not check 'if (install_callbacks)' here, as some users may set it to false and call GLFW callback themselves.
     // FIXME: May break chaining in case user registered their own Emscripten callback?
 #ifdef __EMSCRIPTEN__
-    emscripten_set_wheel_callback(EMSCRIPTEN_EVENT_TARGET_DOCUMENT, NULL, false, ImGui_ImplEmscripten_WheelCallback);
+    emscripten_set_wheel_callback(EMSCRIPTEN_EVENT_TARGET_DOCUMENT, nullptr, false, ImGui_ImplEmscripten_WheelCallback);
 #endif
 
     // Set platform dependent data in viewport
@@ -599,7 +599,7 @@ static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, Glfw
     // Windows: register a WndProc hook so we can intercept some messages.
 #ifdef _WIN32
     bd->GlfwWndProc = (WNDPROC)::GetWindowLongPtr((HWND)main_viewport->PlatformHandleRaw, GWLP_WNDPROC);
-    IM_ASSERT(bd->GlfwWndProc != NULL);
+    IM_ASSERT(bd->GlfwWndProc != nullptr);
     ::SetWindowLongPtr((HWND)main_viewport->PlatformHandleRaw, GWLP_WNDPROC, (LONG_PTR)ImGui_ImplGlfw_WndProc);
 #endif
 
@@ -638,7 +638,7 @@ void ImGui_ImplGlfw_Shutdown()
 #ifdef _WIN32
     ImGuiViewport* main_viewport = ImGui::GetMainViewport();
     ::SetWindowLongPtr((HWND)main_viewport->PlatformHandleRaw, GWLP_WNDPROC, (LONG_PTR)bd->GlfwWndProc);
-    bd->GlfwWndProc = NULL;
+    bd->GlfwWndProc = nullptr;
 #endif
 
     io.BackendPlatformName = nullptr;

backends/imgui_impl_osx.mm

@@ -424,11 +424,11 @@ bool ImGui_ImplOSX_Init(NSView* view)
         NSPasteboard* pasteboard = [NSPasteboard generalPasteboard];
         NSString* available = [pasteboard availableTypeFromArray: [NSArray arrayWithObject:NSPasteboardTypeString]];
         if (![available isEqualToString:NSPasteboardTypeString])
-            return NULL;
+            return nullptr;
 
         NSString* string = [pasteboard stringForType:NSPasteboardTypeString];
         if (string == nil)
-            return NULL;
+            return nullptr;
 
         const char* string_c = (const char*)[string UTF8String];
         size_t string_len = strlen(string_c);

backends/imgui_impl_sdl2.cpp

@@ -487,7 +487,7 @@ void ImGui_ImplSDL2_Shutdown()
         SDL_free(bd->ClipboardTextData);
     for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
         SDL_FreeCursor(bd->MouseCursors[cursor_n]);
-    bd->LastMouseCursor = NULL;
+    bd->LastMouseCursor = nullptr;
 
     io.BackendPlatformName = nullptr;
     io.BackendPlatformUserData = nullptr;

backends/imgui_impl_sdl3.cpp

@@ -421,7 +421,7 @@ void ImGui_ImplSDL3_Shutdown()
         SDL_free(bd->ClipboardTextData);
     for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
         SDL_DestroyCursor(bd->MouseCursors[cursor_n]);
-    bd->LastMouseCursor = NULL;
+    bd->LastMouseCursor = nullptr;
 
     io.BackendPlatformName = nullptr;
     io.BackendPlatformUserData = nullptr;

docs/FAQ.md

@@ -604,7 +604,7 @@ ImFontConfig config;
 config.MergeMode = true;
 io.Fonts->AddFontDefault();
 io.Fonts->AddFontFromFileTTF("fontawesome-webfont.ttf", 16.0f, &config, ranges); // Merge icon font
-io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_pixels, NULL, &config, io.Fonts->GetGlyphRangesJapanese()); // Merge japanese glyphs
+io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_pixels, nullptr, &config, io.Fonts->GetGlyphRangesJapanese()); // Merge japanese glyphs
 ```
 
 ##### [Return to Index](#index)
@@ -616,7 +616,7 @@ When loading a font, pass custom Unicode ranges to specify the glyphs to load.
 
 ```cpp
 // Add default Japanese ranges
-io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_in_pixels, NULL, io.Fonts->GetGlyphRangesJapanese());
+io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_in_pixels, nullptr, io.Fonts->GetGlyphRangesJapanese());
 
 // Or create your own custom ranges (e.g. for a game you can feed your entire game script and only build the characters the game need)
 ImVector<ImWchar> ranges;
@@ -625,7 +625,7 @@ builder.AddText("Hello world");                        // Add a string (here "He
 builder.AddChar(0x7262);                               // Add a specific character
 builder.AddRanges(io.Fonts->GetGlyphRangesJapanese()); // Add one of the default ranges
 builder.BuildRanges(&ranges);                          // Build the final result (ordered ranges with all the unique characters submitted)
-io.Fonts->AddFontFromFileTTF("myfontfile.ttf", 16.0f, NULL, ranges.Data);
+io.Fonts->AddFontFromFileTTF("myfontfile.ttf", 16.0f, nullptr, ranges.Data);
 ```
 
 All your strings need to use UTF-8 encoding. In C++11 you can encode a string literal in UTF-8

docs/FONTS.md

@@ -117,13 +117,13 @@ io.Fonts->Build();
 
 ```cpp
 // Basic Latin, Extended Latin
-io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesDefault());
+io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, nullptr, io.Fonts->GetGlyphRangesDefault());
 
 // Default + Selection of 2500 Ideographs used by Simplified Chinese
-io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesChineseSimplifiedCommon());
+io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, nullptr, io.Fonts->GetGlyphRangesChineseSimplifiedCommon());
 
 // Default + Hiragana, Katakana, Half-Width, Selection of 1946 Ideographs
-io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, NULL, io.Fonts->GetGlyphRangesJapanese());
+io.Fonts->AddFontFromFileTTF("font.ttf", size_pixels, nullptr, io.Fonts->GetGlyphRangesJapanese());
 ```
 See [Using Custom Glyph Ranges](#using-custom-glyph-ranges) section to create your own ranges.
 
@@ -132,7 +132,7 @@ See [Using Custom Glyph Ranges](#using-custom-glyph-ranges) section to create yo
 
 ```cpp
 ImGuiIO& io = ImGui::GetIO();
-io.Fonts->AddFontFromFileTTF("NotoSansCJKjp-Medium.otf", 20.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+io.Fonts->AddFontFromFileTTF("NotoSansCJKjp-Medium.otf", 20.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
 ```
 ```cpp
 ImGui::Text(u8"こんにちは！テスト %d", 123);
@@ -245,7 +245,7 @@ builder.AddChar(0x7262);                               // Add a specific charact
 builder.AddRanges(io.Fonts->GetGlyphRangesJapanese()); // Add one of the default ranges
 builder.BuildRanges(&ranges);                          // Build the final result (ordered ranges with all the unique characters submitted)
 
-io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_in_pixels, NULL, ranges.Data);
+io.Fonts->AddFontFromFileTTF("myfontfile.ttf", size_in_pixels, nullptr, ranges.Data);
 io.Fonts->Build();                                     // Build the atlas while 'ranges' is still in scope and not deleted.
 ```
 
@@ -271,7 +271,7 @@ rect_ids[1] = io.Fonts->AddCustomRectFontGlyph(font, 'b', 13, 13, 13+1);
 io.Fonts->Build();
 
 // Retrieve texture in RGBA format
-unsigned char* tex_pixels = NULL;
+unsigned char* tex_pixels = nullptr;
 int tex_width, tex_height;
 io.Fonts->GetTexDataAsRGBA32(&tex_pixels, &tex_width, &tex_height);
 

docs/TODO.txt

@@ -74,7 +74,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - input text: reorganize event handling, allow CharFilter to modify buffers, allow multiple events? (#541)
  - input text: expose CursorPos in char filter event (#816)
  - input text: try usage idiom of using InputText with data only exposed through get/set accessors, without extraneous copy/alloc. (#3009)
- - input text: access public fields via a non-callback API e.g. InputTextGetState("xxx") that may return NULL if not active (available in internals)
+ - input text: access public fields via a non-callback API e.g. InputTextGetState("xxx") that may return nullptr if not active (available in internals)
  - input text: flag to disable live update of the user buffer (also applies to float/int text input) (#701)
  - input text: hover tooltip could show unclamped text
  - input text: support for INSERT key to toggle overwrite mode. currently disabled because stb_textedit behavior is unsatisfactory on multi-line. (#2863)
@@ -318,7 +318,7 @@ It's mostly a bunch of personal notes, probably incomplete. Feel free to query i
  - nav/menus: allow pressing Menu to leave a sub-menu.
  - nav/menus: a way to access the main menu bar with Alt? (currently needs CTRL+TAB) or last focused window menu bar?
  - nav/menus: when using the main menu bar, even though we restore focus after, the underlying window loses its title bar highlight during menu manipulation. could we prevent it?
- - nav/menus: main menu bar currently cannot restore a NULL focus. Could save NavWindow at the time of being focused, similarly to what popup do?
+ - nav/menus: main menu bar currently cannot restore a nullptr focus. Could save NavWindow at the time of being focused, similarly to what popup do?
  - nav/menus: Alt,Up could open the first menu (e.g. "File") currently it tends to nav into the window/collapse menu. Do do that we would need custom transition?
  - nav/windowing: configure fade-in/fade-out delay on Ctrl+Tab?
  - nav/windowing: when CTRL+Tab/windowing is active, the HoveredWindow detection doesn't take account of the window display re-ordering.

examples/example_allegro5/main.cpp

@@ -47,7 +47,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -57,8 +57,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     bool show_demo_window = true;
     bool show_another_window = false;

examples/example_android_opengl3/main.cpp

@@ -15,7 +15,7 @@
 static EGLDisplay           g_EglDisplay = EGL_NO_DISPLAY;
 static EGLSurface           g_EglSurface = EGL_NO_SURFACE;
 static EGLContext           g_EglContext = EGL_NO_CONTEXT;
-static struct android_app*  g_App = NULL;
+static struct android_app*  g_App = nullptr;
 static bool                 g_Initialized = false;
 static char                 g_LogTag[] = "ImGuiExample";
 static std::string          g_IniFilename = "";
@@ -63,10 +63,10 @@ void android_main(struct android_app* app)
         struct android_poll_source* out_data;
 
         // Poll all events. If the app is not visible, this loop blocks until g_Initialized == true.
-        while (ALooper_pollAll(g_Initialized ? 0 : -1, NULL, &out_events, (void**)&out_data) >= 0)
+        while (ALooper_pollAll(g_Initialized ? 0 : -1, nullptr, &out_events, (void**)&out_data) >= 0)
         {
             // Process one event
-            if (out_data != NULL)
+            if (out_data != nullptr)
                 out_data->process(app, out_data);
 
             // Exit the app by returning from within the infinite loop
@@ -124,7 +124,7 @@ void Init(struct android_app* app)
         if (g_EglContext == EGL_NO_CONTEXT)
             __android_log_print(ANDROID_LOG_ERROR, g_LogTag, "%s", "eglCreateContext() returned EGL_NO_CONTEXT");
 
-        g_EglSurface = eglCreateWindowSurface(g_EglDisplay, egl_config, g_App->window, NULL);
+        g_EglSurface = eglCreateWindowSurface(g_EglDisplay, egl_config, g_App->window, nullptr);
         eglMakeCurrent(g_EglDisplay, g_EglSurface, g_EglSurface, g_EglContext);
     }
 
@@ -148,7 +148,7 @@ void Init(struct android_app* app)
 
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Read 'docs/FONTS.md' for more instructions and details.
     // - Remember that in C/C++ if you want to include a backslash \ in a string literal you need to write a double backslash \\ !
@@ -165,19 +165,19 @@ void Init(struct android_app* app)
     //ImFont* font;
     //font_data_size = GetAssetData("segoeui.ttf", &font_data);
     //font = io.Fonts->AddFontFromMemoryTTF(font_data, font_data_size, 16.0f);
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
     //font_data_size = GetAssetData("DroidSans.ttf", &font_data);
     //font = io.Fonts->AddFontFromMemoryTTF(font_data, font_data_size, 16.0f);
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
     //font_data_size = GetAssetData("Roboto-Medium.ttf", &font_data);
     //font = io.Fonts->AddFontFromMemoryTTF(font_data, font_data_size, 16.0f);
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
     //font_data_size = GetAssetData("Cousine-Regular.ttf", &font_data);
     //font = io.Fonts->AddFontFromMemoryTTF(font_data, font_data_size, 15.0f);
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
     //font_data_size = GetAssetData("ArialUni.ttf", &font_data);
-    //font = io.Fonts->AddFontFromMemoryTTF(font_data, font_data_size, 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //font = io.Fonts->AddFontFromMemoryTTF(font_data, font_data_size, 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Arbitrary scale-up
     // FIXME: Put some effort into DPI awareness
@@ -297,22 +297,22 @@ void Shutdown()
 static int ShowSoftKeyboardInput()
 {
     JavaVM* java_vm = g_App->activity->vm;
-    JNIEnv* java_env = NULL;
+    JNIEnv* java_env = nullptr;
 
     jint jni_return = java_vm->GetEnv((void**)&java_env, JNI_VERSION_1_6);
     if (jni_return == JNI_ERR)
         return -1;
 
-    jni_return = java_vm->AttachCurrentThread(&java_env, NULL);
+    jni_return = java_vm->AttachCurrentThread(&java_env, nullptr);
     if (jni_return != JNI_OK)
         return -2;
 
     jclass native_activity_clazz = java_env->GetObjectClass(g_App->activity->clazz);
-    if (native_activity_clazz == NULL)
+    if (native_activity_clazz == nullptr)
         return -3;
 
     jmethodID method_id = java_env->GetMethodID(native_activity_clazz, "showSoftInput", "()V");
-    if (method_id == NULL)
+    if (method_id == nullptr)
         return -4;
 
     java_env->CallVoidMethod(g_App->activity->clazz, method_id);
@@ -330,22 +330,22 @@ static int ShowSoftKeyboardInput()
 static int PollUnicodeChars()
 {
     JavaVM* java_vm = g_App->activity->vm;
-    JNIEnv* java_env = NULL;
+    JNIEnv* java_env = nullptr;
 
     jint jni_return = java_vm->GetEnv((void**)&java_env, JNI_VERSION_1_6);
     if (jni_return == JNI_ERR)
         return -1;
 
-    jni_return = java_vm->AttachCurrentThread(&java_env, NULL);
+    jni_return = java_vm->AttachCurrentThread(&java_env, nullptr);
     if (jni_return != JNI_OK)
         return -2;
 
     jclass native_activity_clazz = java_env->GetObjectClass(g_App->activity->clazz);
-    if (native_activity_clazz == NULL)
+    if (native_activity_clazz == nullptr)
         return -3;
 
     jmethodID method_id = java_env->GetMethodID(native_activity_clazz, "pollUnicodeChar", "()I");
-    if (method_id == NULL)
+    if (method_id == nullptr)
         return -4;
 
     // Send the actual characters to Dear ImGui

examples/example_apple_metal/main.mm

@@ -67,7 +67,7 @@
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -77,8 +77,8 @@
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     return self;
 }

examples/example_apple_opengl2/main.mm

@@ -55,7 +55,7 @@
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -65,8 +65,8 @@
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 }
 
 -(void)updateAndDrawDemoView

examples/example_emscripten_wgpu/main.cpp

@@ -15,9 +15,9 @@
 #include <webgpu/webgpu_cpp.h>
 
 // Global WebGPU required states
-static WGPUDevice    wgpu_device = NULL;
+static WGPUDevice    wgpu_device = nullptr;
-static WGPUSurface   wgpu_surface = NULL;
+static WGPUSurface   wgpu_surface = nullptr;
-static WGPUSwapChain wgpu_swap_chain = NULL;
+static WGPUSwapChain wgpu_swap_chain = nullptr;
 static int           wgpu_swap_chain_width = 0;
 static int           wgpu_swap_chain_height = 0;
 
@@ -37,7 +37,7 @@ int main(int, char**)
     // Make sure GLFW does not initialize any graphics context.
     // This needs to be done explicitly later.
     glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
-    GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+WebGPU example", NULL, NULL);
+    GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+WebGPU example", nullptr, nullptr);
     if (!window)
     {
         glfwTerminate();
@@ -63,7 +63,7 @@ int main(int, char**)
 
     // For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
     // You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
-    io.IniFilename = NULL;
+    io.IniFilename = nullptr;
 
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();
@@ -76,7 +76,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -89,8 +89,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("fonts/Cousine-Regular.ttf", 15.0f);
     //io.Fonts->AddFontFromFileTTF("fonts/ProggyTiny.ttf", 10.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("fonts/ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("fonts/ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 #endif
 
     // This function will directly return and exit the main function.
@@ -107,7 +107,7 @@ static bool InitWGPU()
     if (!wgpu_device)
         return false;
 
-    wgpuDeviceSetUncapturedErrorCallback(wgpu_device, print_wgpu_error, NULL);
+    wgpuDeviceSetUncapturedErrorCallback(wgpu_device, print_wgpu_error, nullptr);
 
     // Use C++ wrapper due to misbehavior in Emscripten.
     // Some offset computation for wgpuInstanceCreateSurface in JavaScript
@@ -211,7 +211,7 @@ static void MainLoopStep(void* window)
     WGPURenderPassDescriptor render_pass_desc = {};
     render_pass_desc.colorAttachmentCount = 1;
     render_pass_desc.colorAttachments = &color_attachments;
-    render_pass_desc.depthStencilAttachment = NULL;
+    render_pass_desc.depthStencilAttachment = nullptr;
 
     WGPUCommandEncoderDescriptor enc_desc = {};
     WGPUCommandEncoder encoder = wgpuDeviceCreateCommandEncoder(wgpu_device, &enc_desc);

examples/example_glfw_metal/main.mm

@@ -37,7 +37,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -47,8 +47,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Setup window
     glfwSetErrorCallback(glfw_error_callback);
@@ -57,8 +57,8 @@ int main(int, char**)
 
     // Create window with graphics context
     glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
-    GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+Metal example", NULL, NULL);
+    GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+Metal example", nullptr, nullptr);
-    if (window == NULL)
+    if (window == nullptr)
         return 1;
 
     id <MTLDevice> device = MTLCreateSystemDefaultDevice();

examples/example_glfw_opengl2/main.cpp

@@ -36,8 +36,8 @@ int main(int, char**)
         return 1;
 
     // Create window with graphics context
-    GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+OpenGL2 example", NULL, NULL);
+    GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+OpenGL2 example", nullptr, nullptr);
-    if (window == NULL)
+    if (window == nullptr)
         return 1;
     glfwMakeContextCurrent(window);
     glfwSwapInterval(1); // Enable vsync
@@ -60,7 +60,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -70,8 +70,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Our state
     bool show_demo_window = true;

examples/example_glfw_opengl3/main.cpp

@@ -61,8 +61,8 @@ int main(int, char**)
 #endif
 
     // Create window with graphics context
-    GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+OpenGL3 example", NULL, NULL);
+    GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+OpenGL3 example", nullptr, nullptr);
-    if (window == NULL)
+    if (window == nullptr)
         return 1;
     glfwMakeContextCurrent(window);
     glfwSwapInterval(1); // Enable vsync
@@ -85,7 +85,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -96,8 +96,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Our state
     bool show_demo_window = true;
@@ -108,7 +108,7 @@ int main(int, char**)
 #ifdef __EMSCRIPTEN__
     // For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
     // You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
-    io.IniFilename = NULL;
+    io.IniFilename = nullptr;
     EMSCRIPTEN_MAINLOOP_BEGIN
 #else
     while (!glfwWindowShouldClose(window))

examples/example_glfw_vulkan/main.cpp

@@ -32,7 +32,7 @@
 #endif
 
 // Data
-static VkAllocationCallbacks*   g_Allocator = NULL;
+static VkAllocationCallbacks*   g_Allocator = nullptr;
 static VkInstance               g_Instance = VK_NULL_HANDLE;
 static VkPhysicalDevice         g_PhysicalDevice = VK_NULL_HANDLE;
 static VkDevice                 g_Device = VK_NULL_HANDLE;
@@ -98,14 +98,14 @@ static void SetupVulkan(const char** extensions, uint32_t extensions_count)
 
         // Get the function pointer (required for any extensions)
         auto vkCreateDebugReportCallbackEXT = (PFN_vkCreateDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkCreateDebugReportCallbackEXT");
-        IM_ASSERT(vkCreateDebugReportCallbackEXT != NULL);
+        IM_ASSERT(vkCreateDebugReportCallbackEXT != nullptr);
 
         // Setup the debug report callback
         VkDebugReportCallbackCreateInfoEXT debug_report_ci = {};
         debug_report_ci.sType = VK_STRUCTURE_TYPE_DEBUG_REPORT_CALLBACK_CREATE_INFO_EXT;
         debug_report_ci.flags = VK_DEBUG_REPORT_ERROR_BIT_EXT | VK_DEBUG_REPORT_WARNING_BIT_EXT | VK_DEBUG_REPORT_PERFORMANCE_WARNING_BIT_EXT;
         debug_report_ci.pfnCallback = debug_report;
-        debug_report_ci.pUserData = NULL;
+        debug_report_ci.pUserData = nullptr;
         err = vkCreateDebugReportCallbackEXT(g_Instance, &debug_report_ci, g_Allocator, &g_DebugReport);
         check_vk_result(err);
 #else
@@ -119,7 +119,7 @@ static void SetupVulkan(const char** extensions, uint32_t extensions_count)
     // Select GPU
     {
         uint32_t gpu_count;
-        err = vkEnumeratePhysicalDevices(g_Instance, &gpu_count, NULL);
+        err = vkEnumeratePhysicalDevices(g_Instance, &gpu_count, nullptr);
         check_vk_result(err);
         IM_ASSERT(gpu_count > 0);
 
@@ -149,7 +149,7 @@ static void SetupVulkan(const char** extensions, uint32_t extensions_count)
     // Select graphics queue family
     {
         uint32_t count;
-        vkGetPhysicalDeviceQueueFamilyProperties(g_PhysicalDevice, &count, NULL);
+        vkGetPhysicalDeviceQueueFamilyProperties(g_PhysicalDevice, &count, nullptr);
         VkQueueFamilyProperties* queues = (VkQueueFamilyProperties*)malloc(sizeof(VkQueueFamilyProperties) * count);
         vkGetPhysicalDeviceQueueFamilyProperties(g_PhysicalDevice, &count, queues);
         for (uint32_t i = 0; i < count; i++)
@@ -361,7 +361,7 @@ int main(int, char**)
 
     // Create window with Vulkan context
     glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
-    GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+Vulkan example", NULL, NULL);
+    GLFWwindow* window = glfwCreateWindow(1280, 720, "Dear ImGui GLFW+Vulkan example", nullptr, nullptr);
     if (!glfwVulkanSupported())
     {
         printf("GLFW: Vulkan Not Supported\n");
@@ -414,7 +414,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -424,8 +424,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Upload Fonts
     {

examples/example_glut_opengl2/main.cpp

@@ -78,7 +78,7 @@ int main(int argc, char** argv)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -88,8 +88,8 @@ int main(int argc, char** argv)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Main loop
     glutMainLoop();

examples/example_null/main.cpp

@@ -11,7 +11,7 @@ int main(int, char**)
     ImGuiIO& io = ImGui::GetIO();
 
     // Build atlas
-    unsigned char* tex_pixels = NULL;
+    unsigned char* tex_pixels = nullptr;
     int tex_w, tex_h;
     io.Fonts->GetTexDataAsRGBA32(&tex_pixels, &tex_w, &tex_h);
 
@@ -26,7 +26,7 @@ int main(int, char**)
         ImGui::Text("Hello, world!");
         ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
         ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
-        ImGui::ShowDemoWindow(NULL);
+        ImGui::ShowDemoWindow(nullptr);
 
         ImGui::Render();
     }

examples/example_sdl2_directx11/main.cpp

@@ -12,10 +12,10 @@
 #include <SDL_syswm.h>
 
 // Data
-static ID3D11Device*            g_pd3dDevice = NULL;
+static ID3D11Device*            g_pd3dDevice = nullptr;
-static ID3D11DeviceContext*     g_pd3dDeviceContext = NULL;
+static ID3D11DeviceContext*     g_pd3dDeviceContext = nullptr;
-static IDXGISwapChain*          g_pSwapChain = NULL;
+static IDXGISwapChain*          g_pSwapChain = nullptr;
-static ID3D11RenderTargetView*  g_mainRenderTargetView = NULL;
+static ID3D11RenderTargetView*  g_mainRenderTargetView = nullptr;
 
 // Forward declarations of helper functions
 bool CreateDeviceD3D(HWND hWnd);
@@ -73,7 +73,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -83,8 +83,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Our state
     bool show_demo_window = true;
@@ -162,7 +162,7 @@ int main(int, char**)
         // Rendering
         ImGui::Render();
         const float clear_color_with_alpha[4] = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
-        g_pd3dDeviceContext->OMSetRenderTargets(1, &g_mainRenderTargetView, NULL);
+        g_pd3dDeviceContext->OMSetRenderTargets(1, &g_mainRenderTargetView, nullptr);
         g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha);
         ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());
 
@@ -206,7 +206,7 @@ bool CreateDeviceD3D(HWND hWnd)
     //createDeviceFlags |= D3D11_CREATE_DEVICE_DEBUG;
     D3D_FEATURE_LEVEL featureLevel;
     const D3D_FEATURE_LEVEL featureLevelArray[2] = { D3D_FEATURE_LEVEL_11_0, D3D_FEATURE_LEVEL_10_0, };
-    if (D3D11CreateDeviceAndSwapChain(NULL, D3D_DRIVER_TYPE_HARDWARE, NULL, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext) != S_OK)
+    if (D3D11CreateDeviceAndSwapChain(nullptr, D3D_DRIVER_TYPE_HARDWARE, nullptr, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext) != S_OK)
         return false;
 
     CreateRenderTarget();
@@ -216,20 +216,20 @@ bool CreateDeviceD3D(HWND hWnd)
 void CleanupDeviceD3D()
 {
     CleanupRenderTarget();
-    if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = NULL; }
+    if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = nullptr; }
-    if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = NULL; }
+    if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = nullptr; }
-    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; }
+    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = nullptr; }
 }
 
 void CreateRenderTarget()
 {
     ID3D11Texture2D* pBackBuffer;
     g_pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
-    g_pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &g_mainRenderTargetView);
+    g_pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &g_mainRenderTargetView);
     pBackBuffer->Release();
 }
 
 void CleanupRenderTarget()
 {
-    if (g_mainRenderTargetView) { g_mainRenderTargetView->Release(); g_mainRenderTargetView = NULL; }
+    if (g_mainRenderTargetView) { g_mainRenderTargetView->Release(); g_mainRenderTargetView = nullptr; }
 }

examples/example_sdl2_metal/main.mm

@@ -28,7 +28,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -38,8 +38,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Setup SDL
     // (Some versions of SDL before <2.0.10 appears to have performance/stalling issues on a minority of Windows systems,
@@ -57,14 +57,14 @@ int main(int, char**)
     SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
 
     SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL+Metal example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
-    if (window == NULL)
+    if (window == nullptr)
     {
         printf("Error creating window: %s\n", SDL_GetError());
         return -2;
     }
 
     SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
-    if (renderer == NULL)
+    if (renderer == nullptr)
     {
         printf("Error creating renderer: %s\n", SDL_GetError());
         return -3;

examples/example_sdl2_opengl2/main.cpp

@@ -59,7 +59,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -69,8 +69,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Our state
     bool show_demo_window = true;

examples/example_sdl2_opengl3/main.cpp

@@ -86,7 +86,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -97,8 +97,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Our state
     bool show_demo_window = true;
@@ -110,7 +110,7 @@ int main(int, char**)
 #ifdef __EMSCRIPTEN__
     // For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
     // You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
-    io.IniFilename = NULL;
+    io.IniFilename = nullptr;
     EMSCRIPTEN_MAINLOOP_BEGIN
 #else
     while (!done)

examples/example_sdl2_sdlrenderer/main.cpp

@@ -36,7 +36,7 @@ int main(int, char**)
     SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
     SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+SDL_Renderer example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
     SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED);
-    if (renderer == NULL)
+    if (renderer == nullptr)
     {
         SDL_Log("Error creating SDL_Renderer!");
         return 0;
@@ -63,7 +63,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -73,8 +73,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Our state
     bool show_demo_window = true;

examples/example_sdl2_vulkan/main.cpp

@@ -24,7 +24,7 @@
 #endif
 
 // Data
-static VkAllocationCallbacks*   g_Allocator = NULL;
+static VkAllocationCallbacks*   g_Allocator = nullptr;
 static VkInstance               g_Instance = VK_NULL_HANDLE;
 static VkPhysicalDevice         g_PhysicalDevice = VK_NULL_HANDLE;
 static VkDevice                 g_Device = VK_NULL_HANDLE;
@@ -86,14 +86,14 @@ static void SetupVulkan(const char** extensions, uint32_t extensions_count)
 
         // Get the function pointer (required for any extensions)
         auto vkCreateDebugReportCallbackEXT = (PFN_vkCreateDebugReportCallbackEXT)vkGetInstanceProcAddr(g_Instance, "vkCreateDebugReportCallbackEXT");
-        IM_ASSERT(vkCreateDebugReportCallbackEXT != NULL);
+        IM_ASSERT(vkCreateDebugReportCallbackEXT != nullptr);
 
         // Setup the debug report callback
         VkDebugReportCallbackCreateInfoEXT debug_report_ci = {};
         debug_report_ci.sType = VK_STRUCTURE_TYPE_DEBUG_REPORT_CALLBACK_CREATE_INFO_EXT;
         debug_report_ci.flags = VK_DEBUG_REPORT_ERROR_BIT_EXT | VK_DEBUG_REPORT_WARNING_BIT_EXT | VK_DEBUG_REPORT_PERFORMANCE_WARNING_BIT_EXT;
         debug_report_ci.pfnCallback = debug_report;
-        debug_report_ci.pUserData = NULL;
+        debug_report_ci.pUserData = nullptr;
         err = vkCreateDebugReportCallbackEXT(g_Instance, &debug_report_ci, g_Allocator, &g_DebugReport);
         check_vk_result(err);
 #else
@@ -107,7 +107,7 @@ static void SetupVulkan(const char** extensions, uint32_t extensions_count)
     // Select GPU
     {
         uint32_t gpu_count;
-        err = vkEnumeratePhysicalDevices(g_Instance, &gpu_count, NULL);
+        err = vkEnumeratePhysicalDevices(g_Instance, &gpu_count, nullptr);
         check_vk_result(err);
         IM_ASSERT(gpu_count > 0);
 
@@ -137,7 +137,7 @@ static void SetupVulkan(const char** extensions, uint32_t extensions_count)
     // Select graphics queue family
     {
         uint32_t count;
-        vkGetPhysicalDeviceQueueFamilyProperties(g_PhysicalDevice, &count, NULL);
+        vkGetPhysicalDeviceQueueFamilyProperties(g_PhysicalDevice, &count, nullptr);
         VkQueueFamilyProperties* queues = (VkQueueFamilyProperties*)malloc(sizeof(VkQueueFamilyProperties) * count);
         vkGetPhysicalDeviceQueueFamilyProperties(g_PhysicalDevice, &count, queues);
         for (uint32_t i = 0; i < count; i++)
@@ -359,7 +359,7 @@ int main(int, char**)
     SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_VULKAN | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
     SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+Vulkan example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
     uint32_t extensions_count = 0;
-    SDL_Vulkan_GetInstanceExtensions(window, &extensions_count, NULL);
+    SDL_Vulkan_GetInstanceExtensions(window, &extensions_count, nullptr);
     const char** extensions = new const char*[extensions_count];
     SDL_Vulkan_GetInstanceExtensions(window, &extensions_count, extensions);
     SetupVulkan(extensions, extensions_count);
@@ -412,7 +412,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -422,8 +422,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Upload Fonts
     {

examples/example_sdl3_opengl3/main.cpp

@@ -62,7 +62,7 @@ int main(int, char**)
     SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
     SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIDDEN);
     SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL3+OpenGL3 example", 1280, 720, window_flags);
-    if (window == NULL)
+    if (window == nullptr)
     {
         printf("Error: SDL_CreateWindow(): %s\n", SDL_GetError());
         return -1;
@@ -91,7 +91,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -102,8 +102,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Our state
     bool show_demo_window = true;
@@ -115,7 +115,7 @@ int main(int, char**)
 #ifdef __EMSCRIPTEN__
     // For an Emscripten build we are disabling file-system access, so let's not attempt to do a fopen() of the imgui.ini file.
     // You may manually call LoadIniSettingsFromMemory() to load settings from your own storage.
-    io.IniFilename = NULL;
+    io.IniFilename = nullptr;
     EMSCRIPTEN_MAINLOOP_BEGIN
 #else
     while (!done)

examples/example_win32_directx10/main.cpp

@@ -10,9 +10,9 @@
 #include <tchar.h>
 
 // Data
-static ID3D10Device*            g_pd3dDevice = NULL;
+static ID3D10Device*            g_pd3dDevice = nullptr;
-static IDXGISwapChain*          g_pSwapChain = NULL;
+static IDXGISwapChain*          g_pSwapChain = nullptr;
-static ID3D10RenderTargetView*  g_mainRenderTargetView = NULL;
+static ID3D10RenderTargetView*  g_mainRenderTargetView = nullptr;
 
 // Forward declarations of helper functions
 bool CreateDeviceD3D(HWND hWnd);
@@ -26,9 +26,9 @@ int main(int, char**)
 {
     // Create application window
     //ImGui_ImplWin32_EnableDpiAwareness();
-    WNDCLASSEXW wc = { sizeof(wc), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(NULL), NULL, NULL, NULL, NULL, L"ImGui Example", NULL };
+    WNDCLASSEXW wc = { sizeof(wc), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(nullptr), nullptr, nullptr, nullptr, nullptr, L"ImGui Example", nullptr };
     ::RegisterClassExW(&wc);
-    HWND hwnd = ::CreateWindowW(wc.lpszClassName, L"Dear ImGui DirectX10 Example", WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, NULL, NULL, wc.hInstance, NULL);
+    HWND hwnd = ::CreateWindowW(wc.lpszClassName, L"Dear ImGui DirectX10 Example", WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, nullptr, nullptr, wc.hInstance, nullptr);
 
     // Initialize Direct3D
     if (!CreateDeviceD3D(hwnd))
@@ -60,7 +60,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -70,8 +70,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Our state
     bool show_demo_window = true;
@@ -85,7 +85,7 @@ int main(int, char**)
         // Poll and handle messages (inputs, window resize, etc.)
         // See the WndProc() function below for our to dispatch events to the Win32 backend.
         MSG msg;
-        while (::PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
+        while (::PeekMessage(&msg, nullptr, 0U, 0U, PM_REMOVE))
         {
             ::TranslateMessage(&msg);
             ::DispatchMessage(&msg);
@@ -140,7 +140,7 @@ int main(int, char**)
         // Rendering
         ImGui::Render();
         const float clear_color_with_alpha[4] = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
-        g_pd3dDevice->OMSetRenderTargets(1, &g_mainRenderTargetView, NULL);
+        g_pd3dDevice->OMSetRenderTargets(1, &g_mainRenderTargetView, nullptr);
         g_pd3dDevice->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha);
         ImGui_ImplDX10_RenderDrawData(ImGui::GetDrawData());
 
@@ -182,9 +182,9 @@ bool CreateDeviceD3D(HWND hWnd)
 
     UINT createDeviceFlags = 0;
     //createDeviceFlags |= D3D10_CREATE_DEVICE_DEBUG;
-    HRESULT res = D3D10CreateDeviceAndSwapChain(NULL, D3D10_DRIVER_TYPE_HARDWARE, NULL, createDeviceFlags, D3D10_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice);
+    HRESULT res = D3D10CreateDeviceAndSwapChain(nullptr, D3D10_DRIVER_TYPE_HARDWARE, nullptr, createDeviceFlags, D3D10_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice);
     if (res == DXGI_ERROR_UNSUPPORTED) // Try high-performance WARP software driver if hardware is not available.
-        res = D3D10CreateDeviceAndSwapChain(NULL, D3D10_DRIVER_TYPE_WARP, NULL, createDeviceFlags, D3D10_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice);
+        res = D3D10CreateDeviceAndSwapChain(nullptr, D3D10_DRIVER_TYPE_WARP, nullptr, createDeviceFlags, D3D10_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice);
     if (res != S_OK)
         return false;
 
@@ -195,21 +195,21 @@ bool CreateDeviceD3D(HWND hWnd)
 void CleanupDeviceD3D()
 {
     CleanupRenderTarget();
-    if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = NULL; }
+    if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = nullptr; }
-    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; }
+    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = nullptr; }
 }
 
 void CreateRenderTarget()
 {
     ID3D10Texture2D* pBackBuffer;
     g_pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
-    g_pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &g_mainRenderTargetView);
+    g_pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &g_mainRenderTargetView);
     pBackBuffer->Release();
 }
 
 void CleanupRenderTarget()
 {
-    if (g_mainRenderTargetView) { g_mainRenderTargetView->Release(); g_mainRenderTargetView = NULL; }
+    if (g_mainRenderTargetView) { g_mainRenderTargetView->Release(); g_mainRenderTargetView = nullptr; }
 }
 
 // Forward declare message handler from imgui_impl_win32.cpp
@@ -228,7 +228,7 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
     switch (msg)
     {
     case WM_SIZE:
-        if (g_pd3dDevice != NULL && wParam != SIZE_MINIMIZED)
+        if (g_pd3dDevice != nullptr && wParam != SIZE_MINIMIZED)
         {
             CleanupRenderTarget();
             g_pSwapChain->ResizeBuffers(0, (UINT)LOWORD(lParam), (UINT)HIWORD(lParam), DXGI_FORMAT_UNKNOWN, 0);

examples/example_win32_directx11/main.cpp

@@ -9,10 +9,10 @@
 #include <tchar.h>
 
 // Data
-static ID3D11Device*            g_pd3dDevice = NULL;
+static ID3D11Device*            g_pd3dDevice = nullptr;
-static ID3D11DeviceContext*     g_pd3dDeviceContext = NULL;
+static ID3D11DeviceContext*     g_pd3dDeviceContext = nullptr;
-static IDXGISwapChain*          g_pSwapChain = NULL;
+static IDXGISwapChain*          g_pSwapChain = nullptr;
-static ID3D11RenderTargetView*  g_mainRenderTargetView = NULL;
+static ID3D11RenderTargetView*  g_mainRenderTargetView = nullptr;
 
 // Forward declarations of helper functions
 bool CreateDeviceD3D(HWND hWnd);
@@ -26,9 +26,9 @@ int main(int, char**)
 {
     // Create application window
     //ImGui_ImplWin32_EnableDpiAwareness();
-    WNDCLASSEXW wc = { sizeof(wc), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(NULL), NULL, NULL, NULL, NULL, L"ImGui Example", NULL };
+    WNDCLASSEXW wc = { sizeof(wc), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(nullptr), nullptr, nullptr, nullptr, nullptr, L"ImGui Example", nullptr };
     ::RegisterClassExW(&wc);
-    HWND hwnd = ::CreateWindowW(wc.lpszClassName, L"Dear ImGui DirectX11 Example", WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, NULL, NULL, wc.hInstance, NULL);
+    HWND hwnd = ::CreateWindowW(wc.lpszClassName, L"Dear ImGui DirectX11 Example", WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, nullptr, nullptr, wc.hInstance, nullptr);
 
     // Initialize Direct3D
     if (!CreateDeviceD3D(hwnd))
@@ -60,7 +60,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -70,8 +70,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Our state
     bool show_demo_window = true;
@@ -85,7 +85,7 @@ int main(int, char**)
         // Poll and handle messages (inputs, window resize, etc.)
         // See the WndProc() function below for our to dispatch events to the Win32 backend.
         MSG msg;
-        while (::PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
+        while (::PeekMessage(&msg, nullptr, 0U, 0U, PM_REMOVE))
         {
             ::TranslateMessage(&msg);
             ::DispatchMessage(&msg);
@@ -140,7 +140,7 @@ int main(int, char**)
         // Rendering
         ImGui::Render();
         const float clear_color_with_alpha[4] = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
-        g_pd3dDeviceContext->OMSetRenderTargets(1, &g_mainRenderTargetView, NULL);
+        g_pd3dDeviceContext->OMSetRenderTargets(1, &g_mainRenderTargetView, nullptr);
         g_pd3dDeviceContext->ClearRenderTargetView(g_mainRenderTargetView, clear_color_with_alpha);
         ImGui_ImplDX11_RenderDrawData(ImGui::GetDrawData());
 
@@ -185,9 +185,9 @@ bool CreateDeviceD3D(HWND hWnd)
     //createDeviceFlags |= D3D11_CREATE_DEVICE_DEBUG;
     D3D_FEATURE_LEVEL featureLevel;
     const D3D_FEATURE_LEVEL featureLevelArray[2] = { D3D_FEATURE_LEVEL_11_0, D3D_FEATURE_LEVEL_10_0, };
-    HRESULT res = D3D11CreateDeviceAndSwapChain(NULL, D3D_DRIVER_TYPE_HARDWARE, NULL, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext);
+    HRESULT res = D3D11CreateDeviceAndSwapChain(nullptr, D3D_DRIVER_TYPE_HARDWARE, nullptr, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext);
     if (res == DXGI_ERROR_UNSUPPORTED) // Try high-performance WARP software driver if hardware is not available.
-        res = D3D11CreateDeviceAndSwapChain(NULL, D3D_DRIVER_TYPE_WARP, NULL, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext);
+        res = D3D11CreateDeviceAndSwapChain(nullptr, D3D_DRIVER_TYPE_WARP, nullptr, createDeviceFlags, featureLevelArray, 2, D3D11_SDK_VERSION, &sd, &g_pSwapChain, &g_pd3dDevice, &featureLevel, &g_pd3dDeviceContext);
     if (res != S_OK)
         return false;
 
@@ -198,22 +198,22 @@ bool CreateDeviceD3D(HWND hWnd)
 void CleanupDeviceD3D()
 {
     CleanupRenderTarget();
-    if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = NULL; }
+    if (g_pSwapChain) { g_pSwapChain->Release(); g_pSwapChain = nullptr; }
-    if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = NULL; }
+    if (g_pd3dDeviceContext) { g_pd3dDeviceContext->Release(); g_pd3dDeviceContext = nullptr; }
-    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; }
+    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = nullptr; }
 }
 
 void CreateRenderTarget()
 {
     ID3D11Texture2D* pBackBuffer;
     g_pSwapChain->GetBuffer(0, IID_PPV_ARGS(&pBackBuffer));
-    g_pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, &g_mainRenderTargetView);
+    g_pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, &g_mainRenderTargetView);
     pBackBuffer->Release();
 }
 
 void CleanupRenderTarget()
 {
-    if (g_mainRenderTargetView) { g_mainRenderTargetView->Release(); g_mainRenderTargetView = NULL; }
+    if (g_mainRenderTargetView) { g_mainRenderTargetView->Release(); g_mainRenderTargetView = nullptr; }
 }
 
 // Forward declare message handler from imgui_impl_win32.cpp
@@ -232,7 +232,7 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
     switch (msg)
     {
     case WM_SIZE:
-        if (g_pd3dDevice != NULL && wParam != SIZE_MINIMIZED)
+        if (g_pd3dDevice != nullptr && wParam != SIZE_MINIMIZED)
         {
             CleanupRenderTarget();
             g_pSwapChain->ResizeBuffers(0, (UINT)LOWORD(lParam), (UINT)HIWORD(lParam), DXGI_FORMAT_UNKNOWN, 0);

examples/example_win32_directx12/main.cpp

@@ -34,16 +34,16 @@ static FrameContext                 g_frameContext[NUM_FRAMES_IN_FLIGHT] = {};
 static UINT                         g_frameIndex = 0;
 
 static int const                    NUM_BACK_BUFFERS = 3;
-static ID3D12Device*                g_pd3dDevice = NULL;
+static ID3D12Device*                g_pd3dDevice = nullptr;
-static ID3D12DescriptorHeap*        g_pd3dRtvDescHeap = NULL;
+static ID3D12DescriptorHeap*        g_pd3dRtvDescHeap = nullptr;
-static ID3D12DescriptorHeap*        g_pd3dSrvDescHeap = NULL;
+static ID3D12DescriptorHeap*        g_pd3dSrvDescHeap = nullptr;
-static ID3D12CommandQueue*          g_pd3dCommandQueue = NULL;
+static ID3D12CommandQueue*          g_pd3dCommandQueue = nullptr;
-static ID3D12GraphicsCommandList*   g_pd3dCommandList = NULL;
+static ID3D12GraphicsCommandList*   g_pd3dCommandList = nullptr;
-static ID3D12Fence*                 g_fence = NULL;
+static ID3D12Fence*                 g_fence = nullptr;
-static HANDLE                       g_fenceEvent = NULL;
+static HANDLE                       g_fenceEvent = nullptr;
 static UINT64                       g_fenceLastSignaledValue = 0;
-static IDXGISwapChain3*             g_pSwapChain = NULL;
+static IDXGISwapChain3*             g_pSwapChain = nullptr;
-static HANDLE                       g_hSwapChainWaitableObject = NULL;
+static HANDLE                       g_hSwapChainWaitableObject = nullptr;
 static ID3D12Resource*              g_mainRenderTargetResource[NUM_BACK_BUFFERS] = {};
 static D3D12_CPU_DESCRIPTOR_HANDLE  g_mainRenderTargetDescriptor[NUM_BACK_BUFFERS] = {};
 
@@ -61,9 +61,9 @@ int main(int, char**)
 {
     // Create application window
     //ImGui_ImplWin32_EnableDpiAwareness();
-    WNDCLASSEXW wc = { sizeof(wc), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(NULL), NULL, NULL, NULL, NULL, L"ImGui Example", NULL };
+    WNDCLASSEXW wc = { sizeof(wc), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(nullptr), nullptr, nullptr, nullptr, nullptr, L"ImGui Example", nullptr };
     ::RegisterClassExW(&wc);
-    HWND hwnd = ::CreateWindowW(wc.lpszClassName, L"Dear ImGui DirectX12 Example", WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, NULL, NULL, wc.hInstance, NULL);
+    HWND hwnd = ::CreateWindowW(wc.lpszClassName, L"Dear ImGui DirectX12 Example", WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, nullptr, nullptr, wc.hInstance, nullptr);
 
     // Initialize Direct3D
     if (!CreateDeviceD3D(hwnd))
@@ -98,7 +98,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -108,8 +108,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Our state
     bool show_demo_window = true;
@@ -123,7 +123,7 @@ int main(int, char**)
         // Poll and handle messages (inputs, window resize, etc.)
         // See the WndProc() function below for our to dispatch events to the Win32 backend.
         MSG msg;
-        while (::PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
+        while (::PeekMessage(&msg, nullptr, 0U, 0U, PM_REMOVE))
         {
             ::TranslateMessage(&msg);
             ::DispatchMessage(&msg);
@@ -189,13 +189,13 @@ int main(int, char**)
         barrier.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
         barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_PRESENT;
         barrier.Transition.StateAfter  = D3D12_RESOURCE_STATE_RENDER_TARGET;
-        g_pd3dCommandList->Reset(frameCtx->CommandAllocator, NULL);
+        g_pd3dCommandList->Reset(frameCtx->CommandAllocator, nullptr);
         g_pd3dCommandList->ResourceBarrier(1, &barrier);
 
         // Render Dear ImGui graphics
         const float clear_color_with_alpha[4] = { clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w };
-        g_pd3dCommandList->ClearRenderTargetView(g_mainRenderTargetDescriptor[backBufferIdx], clear_color_with_alpha, 0, NULL);
+        g_pd3dCommandList->ClearRenderTargetView(g_mainRenderTargetDescriptor[backBufferIdx], clear_color_with_alpha, 0, nullptr);
-        g_pd3dCommandList->OMSetRenderTargets(1, &g_mainRenderTargetDescriptor[backBufferIdx], FALSE, NULL);
+        g_pd3dCommandList->OMSetRenderTargets(1, &g_mainRenderTargetDescriptor[backBufferIdx], FALSE, nullptr);
         g_pd3dCommandList->SetDescriptorHeaps(1, &g_pd3dSrvDescHeap);
         ImGui_ImplDX12_RenderDrawData(ImGui::GetDrawData(), g_pd3dCommandList);
         barrier.Transition.StateBefore = D3D12_RESOURCE_STATE_RENDER_TARGET;
@@ -252,21 +252,21 @@ bool CreateDeviceD3D(HWND hWnd)
 
     // [DEBUG] Enable debug interface
 #ifdef DX12_ENABLE_DEBUG_LAYER
-    ID3D12Debug* pdx12Debug = NULL;
+    ID3D12Debug* pdx12Debug = nullptr;
     if (SUCCEEDED(D3D12GetDebugInterface(IID_PPV_ARGS(&pdx12Debug))))
         pdx12Debug->EnableDebugLayer();
 #endif
 
     // Create device
     D3D_FEATURE_LEVEL featureLevel = D3D_FEATURE_LEVEL_11_0;
-    if (D3D12CreateDevice(NULL, featureLevel, IID_PPV_ARGS(&g_pd3dDevice)) != S_OK)
+    if (D3D12CreateDevice(nullptr, featureLevel, IID_PPV_ARGS(&g_pd3dDevice)) != S_OK)
         return false;
 
     // [DEBUG] Setup debug interface to break on any warnings/errors
 #ifdef DX12_ENABLE_DEBUG_LAYER
-    if (pdx12Debug != NULL)
+    if (pdx12Debug != nullptr)
     {
-        ID3D12InfoQueue* pInfoQueue = NULL;
+        ID3D12InfoQueue* pInfoQueue = nullptr;
         g_pd3dDevice->QueryInterface(IID_PPV_ARGS(&pInfoQueue));
         pInfoQueue->SetBreakOnSeverity(D3D12_MESSAGE_SEVERITY_ERROR, true);
         pInfoQueue->SetBreakOnSeverity(D3D12_MESSAGE_SEVERITY_CORRUPTION, true);
@@ -316,23 +316,23 @@ bool CreateDeviceD3D(HWND hWnd)
         if (g_pd3dDevice->CreateCommandAllocator(D3D12_COMMAND_LIST_TYPE_DIRECT, IID_PPV_ARGS(&g_frameContext[i].CommandAllocator)) != S_OK)
             return false;
 
-    if (g_pd3dDevice->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, g_frameContext[0].CommandAllocator, NULL, IID_PPV_ARGS(&g_pd3dCommandList)) != S_OK ||
+    if (g_pd3dDevice->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, g_frameContext[0].CommandAllocator, nullptr, IID_PPV_ARGS(&g_pd3dCommandList)) != S_OK ||
         g_pd3dCommandList->Close() != S_OK)
         return false;
 
     if (g_pd3dDevice->CreateFence(0, D3D12_FENCE_FLAG_NONE, IID_PPV_ARGS(&g_fence)) != S_OK)
         return false;
 
-    g_fenceEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
+    g_fenceEvent = CreateEvent(nullptr, FALSE, FALSE, nullptr);
-    if (g_fenceEvent == NULL)
+    if (g_fenceEvent == nullptr)
         return false;
 
     {
-        IDXGIFactory4* dxgiFactory = NULL;
+        IDXGIFactory4* dxgiFactory = nullptr;
-        IDXGISwapChain1* swapChain1 = NULL;
+        IDXGISwapChain1* swapChain1 = nullptr;
         if (CreateDXGIFactory1(IID_PPV_ARGS(&dxgiFactory)) != S_OK)
             return false;
-        if (dxgiFactory->CreateSwapChainForHwnd(g_pd3dCommandQueue, hWnd, &sd, NULL, NULL, &swapChain1) != S_OK)
+        if (dxgiFactory->CreateSwapChainForHwnd(g_pd3dCommandQueue, hWnd, &sd, nullptr, nullptr, &swapChain1) != S_OK)
             return false;
         if (swapChain1->QueryInterface(IID_PPV_ARGS(&g_pSwapChain)) != S_OK)
             return false;
@@ -349,20 +349,20 @@ bool CreateDeviceD3D(HWND hWnd)
 void CleanupDeviceD3D()
 {
     CleanupRenderTarget();
-    if (g_pSwapChain) { g_pSwapChain->SetFullscreenState(false, NULL); g_pSwapChain->Release(); g_pSwapChain = NULL; }
+    if (g_pSwapChain) { g_pSwapChain->SetFullscreenState(false, nullptr); g_pSwapChain->Release(); g_pSwapChain = nullptr; }
-    if (g_hSwapChainWaitableObject != NULL) { CloseHandle(g_hSwapChainWaitableObject); }
+    if (g_hSwapChainWaitableObject != nullptr) { CloseHandle(g_hSwapChainWaitableObject); }
     for (UINT i = 0; i < NUM_FRAMES_IN_FLIGHT; i++)
-        if (g_frameContext[i].CommandAllocator) { g_frameContext[i].CommandAllocator->Release(); g_frameContext[i].CommandAllocator = NULL; }
+        if (g_frameContext[i].CommandAllocator) { g_frameContext[i].CommandAllocator->Release(); g_frameContext[i].CommandAllocator = nullptr; }
-    if (g_pd3dCommandQueue) { g_pd3dCommandQueue->Release(); g_pd3dCommandQueue = NULL; }
+    if (g_pd3dCommandQueue) { g_pd3dCommandQueue->Release(); g_pd3dCommandQueue = nullptr; }
-    if (g_pd3dCommandList) { g_pd3dCommandList->Release(); g_pd3dCommandList = NULL; }
+    if (g_pd3dCommandList) { g_pd3dCommandList->Release(); g_pd3dCommandList = nullptr; }
-    if (g_pd3dRtvDescHeap) { g_pd3dRtvDescHeap->Release(); g_pd3dRtvDescHeap = NULL; }
+    if (g_pd3dRtvDescHeap) { g_pd3dRtvDescHeap->Release(); g_pd3dRtvDescHeap = nullptr; }
-    if (g_pd3dSrvDescHeap) { g_pd3dSrvDescHeap->Release(); g_pd3dSrvDescHeap = NULL; }
+    if (g_pd3dSrvDescHeap) { g_pd3dSrvDescHeap->Release(); g_pd3dSrvDescHeap = nullptr; }
-    if (g_fence) { g_fence->Release(); g_fence = NULL; }
+    if (g_fence) { g_fence->Release(); g_fence = nullptr; }
-    if (g_fenceEvent) { CloseHandle(g_fenceEvent); g_fenceEvent = NULL; }
+    if (g_fenceEvent) { CloseHandle(g_fenceEvent); g_fenceEvent = nullptr; }
-    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; }
+    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = nullptr; }
 
 #ifdef DX12_ENABLE_DEBUG_LAYER
-    IDXGIDebug1* pDebug = NULL;
+    IDXGIDebug1* pDebug = nullptr;
     if (SUCCEEDED(DXGIGetDebugInterface1(0, IID_PPV_ARGS(&pDebug))))
     {
         pDebug->ReportLiveObjects(DXGI_DEBUG_ALL, DXGI_DEBUG_RLO_SUMMARY);
@@ -375,9 +375,9 @@ void CreateRenderTarget()
 {
     for (UINT i = 0; i < NUM_BACK_BUFFERS; i++)
     {
-        ID3D12Resource* pBackBuffer = NULL;
+        ID3D12Resource* pBackBuffer = nullptr;
         g_pSwapChain->GetBuffer(i, IID_PPV_ARGS(&pBackBuffer));
-        g_pd3dDevice->CreateRenderTargetView(pBackBuffer, NULL, g_mainRenderTargetDescriptor[i]);
+        g_pd3dDevice->CreateRenderTargetView(pBackBuffer, nullptr, g_mainRenderTargetDescriptor[i]);
         g_mainRenderTargetResource[i] = pBackBuffer;
     }
 }
@@ -387,7 +387,7 @@ void CleanupRenderTarget()
     WaitForLastSubmittedFrame();
 
     for (UINT i = 0; i < NUM_BACK_BUFFERS; i++)
-        if (g_mainRenderTargetResource[i]) { g_mainRenderTargetResource[i]->Release(); g_mainRenderTargetResource[i] = NULL; }
+        if (g_mainRenderTargetResource[i]) { g_mainRenderTargetResource[i]->Release(); g_mainRenderTargetResource[i] = nullptr; }
 }
 
 void WaitForLastSubmittedFrame()
@@ -411,7 +411,7 @@ FrameContext* WaitForNextFrameResources()
     UINT nextFrameIndex = g_frameIndex + 1;
     g_frameIndex = nextFrameIndex;
 
-    HANDLE waitableObjects[] = { g_hSwapChainWaitableObject, NULL };
+    HANDLE waitableObjects[] = { g_hSwapChainWaitableObject, nullptr };
     DWORD numWaitableObjects = 1;
 
     FrameContext* frameCtx = &g_frameContext[nextFrameIndex % NUM_FRAMES_IN_FLIGHT];
@@ -445,7 +445,7 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
     switch (msg)
     {
     case WM_SIZE:
-        if (g_pd3dDevice != NULL && wParam != SIZE_MINIMIZED)
+        if (g_pd3dDevice != nullptr && wParam != SIZE_MINIMIZED)
         {
             WaitForLastSubmittedFrame();
             CleanupRenderTarget();

examples/example_win32_directx9/main.cpp

@@ -9,8 +9,8 @@
 #include <tchar.h>
 
 // Data
-static LPDIRECT3D9              g_pD3D = NULL;
+static LPDIRECT3D9              g_pD3D = nullptr;
-static LPDIRECT3DDEVICE9        g_pd3dDevice = NULL;
+static LPDIRECT3DDEVICE9        g_pd3dDevice = nullptr;
 static D3DPRESENT_PARAMETERS    g_d3dpp = {};
 
 // Forward declarations of helper functions
@@ -24,9 +24,9 @@ int main(int, char**)
 {
     // Create application window
     //ImGui_ImplWin32_EnableDpiAwareness();
-    WNDCLASSEXW wc = { sizeof(wc), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(NULL), NULL, NULL, NULL, NULL, L"ImGui Example", NULL };
+    WNDCLASSEXW wc = { sizeof(wc), CS_CLASSDC, WndProc, 0L, 0L, GetModuleHandle(nullptr), nullptr, nullptr, nullptr, nullptr, L"ImGui Example", nullptr };
     ::RegisterClassExW(&wc);
-    HWND hwnd = ::CreateWindowW(wc.lpszClassName, L"Dear ImGui DirectX9 Example", WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, NULL, NULL, wc.hInstance, NULL);
+    HWND hwnd = ::CreateWindowW(wc.lpszClassName, L"Dear ImGui DirectX9 Example", WS_OVERLAPPEDWINDOW, 100, 100, 1280, 800, nullptr, nullptr, wc.hInstance, nullptr);
 
     // Initialize Direct3D
     if (!CreateDeviceD3D(hwnd))
@@ -58,7 +58,7 @@ int main(int, char**)
     // Load Fonts
     // - If no fonts are loaded, dear imgui will use the default font. You can also load multiple fonts and use ImGui::PushFont()/PopFont() to select them.
     // - AddFontFromFileTTF() will return the ImFont* so you can store it if you need to select the font among multiple.
-    // - If the file cannot be loaded, the function will return NULL. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
+    // - If the file cannot be loaded, the function will return a nullptr. Please handle those errors in your application (e.g. use an assertion, or display an error and quit).
     // - The fonts will be rasterized at a given size (w/ oversampling) and stored into a texture when calling ImFontAtlas::Build()/GetTexDataAsXXXX(), which ImGui_ImplXXXX_NewFrame below will call.
     // - Use '#define IMGUI_ENABLE_FREETYPE' in your imconfig file to use Freetype for higher quality font rendering.
     // - Read 'docs/FONTS.md' for more instructions and details.
@@ -68,8 +68,8 @@ int main(int, char**)
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/DroidSans.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Roboto-Medium.ttf", 16.0f);
     //io.Fonts->AddFontFromFileTTF("../../misc/fonts/Cousine-Regular.ttf", 15.0f);
-    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());
+    //ImFont* font = io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, nullptr, io.Fonts->GetGlyphRangesJapanese());
-    //IM_ASSERT(font != NULL);
+    //IM_ASSERT(font != nullptr);
 
     // Our state
     bool show_demo_window = true;
@@ -83,7 +83,7 @@ int main(int, char**)
         // Poll and handle messages (inputs, window resize, etc.)
         // See the WndProc() function below for our to dispatch events to the Win32 backend.
         MSG msg;
-        while (::PeekMessage(&msg, NULL, 0U, 0U, PM_REMOVE))
+        while (::PeekMessage(&msg, nullptr, 0U, 0U, PM_REMOVE))
         {
             ::TranslateMessage(&msg);
             ::DispatchMessage(&msg);
@@ -141,14 +141,14 @@ int main(int, char**)
         g_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE);
         g_pd3dDevice->SetRenderState(D3DRS_SCISSORTESTENABLE, FALSE);
         D3DCOLOR clear_col_dx = D3DCOLOR_RGBA((int)(clear_color.x*clear_color.w*255.0f), (int)(clear_color.y*clear_color.w*255.0f), (int)(clear_color.z*clear_color.w*255.0f), (int)(clear_color.w*255.0f));
-        g_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, clear_col_dx, 1.0f, 0);
+        g_pd3dDevice->Clear(0, nullptr, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, clear_col_dx, 1.0f, 0);
         if (g_pd3dDevice->BeginScene() >= 0)
         {
             ImGui::Render();
             ImGui_ImplDX9_RenderDrawData(ImGui::GetDrawData());
             g_pd3dDevice->EndScene();
         }
-        HRESULT result = g_pd3dDevice->Present(NULL, NULL, NULL, NULL);
+        HRESULT result = g_pd3dDevice->Present(nullptr, nullptr, nullptr, nullptr);
 
         // Handle loss of D3D9 device
         if (result == D3DERR_DEVICELOST && g_pd3dDevice->TestCooperativeLevel() == D3DERR_DEVICENOTRESET)
@@ -170,7 +170,7 @@ int main(int, char**)
 
 bool CreateDeviceD3D(HWND hWnd)
 {
-    if ((g_pD3D = Direct3DCreate9(D3D_SDK_VERSION)) == NULL)
+    if ((g_pD3D = Direct3DCreate9(D3D_SDK_VERSION)) == nullptr)
         return false;
 
     // Create the D3DDevice
@@ -190,8 +190,8 @@ bool CreateDeviceD3D(HWND hWnd)
 
 void CleanupDeviceD3D()
 {
-    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = NULL; }
+    if (g_pd3dDevice) { g_pd3dDevice->Release(); g_pd3dDevice = nullptr; }
-    if (g_pD3D) { g_pD3D->Release(); g_pD3D = NULL; }
+    if (g_pD3D) { g_pD3D->Release(); g_pD3D = nullptr; }
 }
 
 void ResetDevice()
@@ -219,7 +219,7 @@ LRESULT WINAPI WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
     switch (msg)
     {
     case WM_SIZE:
-        if (g_pd3dDevice != NULL && wParam != SIZE_MINIMIZED)
+        if (g_pd3dDevice != nullptr && wParam != SIZE_MINIMIZED)
         {
             g_d3dpp.BackBufferWidth = LOWORD(lParam);
             g_d3dpp.BackBufferHeight = HIWORD(lParam);

imgui.cpp

@@ -286,7 +286,7 @@ CODE
      // Build and load the texture atlas into a texture
      // (In the examples/ app this is usually done within the ImGui_ImplXXX_Init() function from one of the demo Renderer)
      int width, height;
-     unsigned char* pixels = NULL;
+     unsigned char* pixels = nullptr;
      io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);
 
      // At this point you've got the texture data and you need to upload that to your graphic system:

misc/cpp/imgui_stdlib.h

@@ -15,7 +15,7 @@ namespace ImGui
 {
     // ImGui::InputText() with std::string
     // Because text input needs dynamic resizing, we need to setup a callback to grow the capacity
-    IMGUI_API bool  InputText(const char* label, std::string* str, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
+    IMGUI_API bool  InputText(const char* label, std::string* str, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = nullptr, void* user_data = nullptr);
-    IMGUI_API bool  InputTextMultiline(const char* label, std::string* str, const ImVec2& size = ImVec2(0, 0), ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
+    IMGUI_API bool  InputTextMultiline(const char* label, std::string* str, const ImVec2& size = ImVec2(0, 0), ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = nullptr, void* user_data = nullptr);
-    IMGUI_API bool  InputTextWithHint(const char* label, const char* hint, std::string* str, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
+    IMGUI_API bool  InputTextWithHint(const char* label, const char* hint, std::string* str, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = nullptr, void* user_data = nullptr);
 }

misc/fonts/binary_to_compressed_c.cpp

@@ -349,9 +349,9 @@ static int stb_compress_inner(stb_uchar *input, stb_uint length)
 
     stb_uchar **chash;
     chash = (stb_uchar**) malloc(stb__hashsize * sizeof(stb_uchar*));
-    if (chash == NULL) return 0; // failure
+    if (chash == nullptr) return 0; // failure
     for (i=0; i < stb__hashsize; ++i)
-        chash[i] = NULL;
+        chash[i] = nullptr;
 
     // stream signature
     stb_out(0x57); stb_out(0xbc);
@@ -380,7 +380,7 @@ static int stb_compress_inner(stb_uchar *input, stb_uint length)
 stb_uint stb_compress(stb_uchar *out, stb_uchar *input, stb_uint length)
 {
     stb__out = out;
-    stb__outfile = NULL;
+    stb__outfile = nullptr;
 
     stb_compress_inner(input, length);
 

misc/freetype/imgui_freetype.cpp

@@ -66,7 +66,7 @@ static void  ImGuiFreeTypeDefaultFreeFunc(void* ptr, void* user_data) { IM_UNUSE
 // Current memory allocators
 static void* (*GImGuiFreeTypeAllocFunc)(size_t size, void* user_data) = ImGuiFreeTypeDefaultAllocFunc;
 static void  (*GImGuiFreeTypeFreeFunc)(void* ptr, void* user_data) = ImGuiFreeTypeDefaultFreeFunc;
-static void* GImGuiFreeTypeAllocatorUserData = NULL;
+static void* GImGuiFreeTypeAllocatorUserData = nullptr;
 
 //-------------------------------------------------------------------------
 // Code
@@ -136,7 +136,7 @@ namespace
         void                    SetPixelHeight(int pixel_height); // Change font pixel size. All following calls to RasterizeGlyph() will use this size
         const FT_Glyph_Metrics* LoadGlyph(uint32_t in_codepoint);
         const FT_Bitmap*        RenderGlyphAndGetInfo(GlyphInfo* out_glyph_info);
-        void                    BlitGlyph(const FT_Bitmap* ft_bitmap, uint32_t* dst, uint32_t dst_pitch, unsigned char* multiply_table = NULL);
+        void                    BlitGlyph(const FT_Bitmap* ft_bitmap, uint32_t* dst, uint32_t dst_pitch, unsigned char* multiply_table = nullptr);
         ~FreeTypeFont()         { CloseFont(); }
 
         // [Internals]
@@ -198,7 +198,7 @@ namespace
         if (Face)
         {
             FT_Done_Face(Face);
-            Face = NULL;
+            Face = nullptr;
         }
     }
 
@@ -229,7 +229,7 @@ namespace
     {
         uint32_t glyph_index = FT_Get_Char_Index(Face, codepoint);
         if (glyph_index == 0)
-            return NULL;
+            return nullptr;
 
 		// If this crash for you: FreeType 2.11.0 has a crash bug on some bitmap/colored fonts.
 		// - https://gitlab.freedesktop.org/freetype/freetype/-/issues/1076
@@ -238,7 +238,7 @@ namespace
 		// You can use FreeType 2.10, or the patched version of 2.11.0 in VcPkg, or probably any upcoming FreeType version.
         FT_Error error = FT_Load_Glyph(Face, glyph_index, LoadFlags);
         if (error)
-            return NULL;
+            return nullptr;
 
         // Need an outline for this to work
         FT_GlyphSlot slot = Face->glyph;
@@ -264,7 +264,7 @@ namespace
         FT_GlyphSlot slot = Face->glyph;
         FT_Error error = FT_Render_Glyph(slot, RenderMode);
         if (error != 0)
-            return NULL;
+            return nullptr;
 
         FT_Bitmap* ft_bitmap = &Face->glyph->bitmap;
         out_glyph_info->Width = (int)ft_bitmap->width;
@@ -279,7 +279,7 @@ namespace
 
     void FreeTypeFont::BlitGlyph(const FT_Bitmap* ft_bitmap, uint32_t* dst, uint32_t dst_pitch, unsigned char* multiply_table)
     {
-        IM_ASSERT(ft_bitmap != NULL);
+        IM_ASSERT(ft_bitmap != nullptr);
         const uint32_t w = ft_bitmap->width;
         const uint32_t h = ft_bitmap->rows;
         const uint8_t* src = ft_bitmap->buffer;
@@ -289,7 +289,7 @@ namespace
         {
         case FT_PIXEL_MODE_GRAY: // Grayscale image, 1 byte per pixel.
             {
-                if (multiply_table == NULL)
+                if (multiply_table == nullptr)
                 {
                     for (uint32_t y = 0; y < h; y++, src += src_pitch, dst += dst_pitch)
                         for (uint32_t x = 0; x < w; x++)
@@ -324,7 +324,7 @@ namespace
             {
                 // FIXME: Converting pre-multiplied alpha to straight. Doesn't smell good.
                 #define DE_MULTIPLY(color, alpha) (ImU32)(255.0f * (float)color / (float)alpha + 0.5f)
-                if (multiply_table == NULL)
+                if (multiply_table == nullptr)
                 {
                     for (uint32_t y = 0; y < h; y++, src += src_pitch, dst += dst_pitch)
                         for (uint32_t x = 0; x < w; x++)
@@ -403,7 +403,7 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
     ImFontAtlasBuildInit(atlas);
 
     // Clear atlas
-    atlas->TexID = (ImTextureID)NULL;
+    atlas->TexID = (ImTextureID)nullptr;
     atlas->TexWidth = atlas->TexHeight = 0;
     atlas->TexUvScale = ImVec2(0.0f, 0.0f);
     atlas->TexUvWhitePixel = ImVec2(0.0f, 0.0f);
@@ -550,12 +550,12 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
             ImFontBuildSrcGlyphFT& src_glyph = src_tmp.GlyphsList[glyph_i];
 
             const FT_Glyph_Metrics* metrics = src_tmp.Font.LoadGlyph(src_glyph.Codepoint);
-            if (metrics == NULL)
+            if (metrics == nullptr)
                 continue;
 
             // Render glyph into a bitmap (currently held by FreeType)
             const FT_Bitmap* ft_bitmap = src_tmp.Font.RenderGlyphAndGetInfo(&src_glyph.Info);
-            if (ft_bitmap == NULL)
+            if (ft_bitmap == nullptr)
                 continue;
 
             // Allocate new temporary chunk if needed
@@ -570,7 +570,7 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
             // Blit rasterized pixels to our temporary buffer and keep a pointer to it.
             src_glyph.BitmapData = (unsigned int*)(buf_bitmap_buffers.back() + buf_bitmap_current_used_bytes);
             buf_bitmap_current_used_bytes += bitmap_size_in_bytes;
-            src_tmp.Font.BlitGlyph(ft_bitmap, src_glyph.BitmapData, src_glyph.Info.Width, multiply_enabled ? multiply_table : NULL);
+            src_tmp.Font.BlitGlyph(ft_bitmap, src_glyph.BitmapData, src_glyph.Info.Width, multiply_enabled ? multiply_table : nullptr);
 
             src_tmp.Rects[glyph_i].w = (stbrp_coord)(src_glyph.Info.Width + padding);
             src_tmp.Rects[glyph_i].h = (stbrp_coord)(src_glyph.Info.Height + padding);
@@ -686,7 +686,7 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
             size_t blit_src_stride = (size_t)src_glyph.Info.Width;
             size_t blit_dst_stride = (size_t)atlas->TexWidth;
             unsigned int* blit_src = src_glyph.BitmapData;
-            if (atlas->TexPixelsAlpha8 != NULL)
+            if (atlas->TexPixelsAlpha8 != nullptr)
             {
                 unsigned char* blit_dst = atlas->TexPixelsAlpha8 + (ty * blit_dst_stride) + tx;
                 for (int y = 0; y < info.Height; y++, blit_dst += blit_dst_stride, blit_src += blit_src_stride)
@@ -702,7 +702,7 @@ bool ImFontAtlasBuildWithFreeTypeEx(FT_Library ft_library, ImFontAtlas* atlas, u
             }
         }
 
-        src_tmp.Rects = NULL;
+        src_tmp.Rects = nullptr;
     }
     atlas->TexPixelsUseColors = tex_use_colors;
 
@@ -730,13 +730,13 @@ static void FreeType_Free(FT_Memory /*memory*/, void* block)
 static void* FreeType_Realloc(FT_Memory /*memory*/, long cur_size, long new_size, void* block)
 {
     // Implement realloc() as we don't ask user to provide it.
-    if (block == NULL)
+    if (block == nullptr)
         return GImGuiFreeTypeAllocFunc((size_t)new_size, GImGuiFreeTypeAllocatorUserData);
 
     if (new_size == 0)
     {
         GImGuiFreeTypeFreeFunc(block, GImGuiFreeTypeAllocatorUserData);
-        return NULL;
+        return nullptr;
     }
 
     if (new_size > cur_size)
@@ -754,7 +754,7 @@ static bool ImFontAtlasBuildWithFreeType(ImFontAtlas* atlas)
 {
     // FreeType memory management: https://www.freetype.org/freetype2/docs/design/design-4.html
     FT_MemoryRec_ memory_rec = {};
-    memory_rec.user = NULL;
+    memory_rec.user = nullptr;
     memory_rec.alloc = &FreeType_Alloc;
     memory_rec.free = &FreeType_Free;
     memory_rec.realloc = &FreeType_Realloc;

misc/freetype/imgui_freetype.h

@@ -40,7 +40,7 @@ namespace ImGuiFreeType
 
     // Override allocators. By default ImGuiFreeType will use IM_ALLOC()/IM_FREE()
     // However, as FreeType does lots of allocations we provide a way for the user to redirect it to a separate memory heap if desired.
-    IMGUI_API void                      SetAllocatorFunctions(void* (*alloc_func)(size_t sz, void* user_data), void (*free_func)(void* ptr, void* user_data), void* user_data = NULL);
+    IMGUI_API void                      SetAllocatorFunctions(void* (*alloc_func)(size_t sz, void* user_data), void (*free_func)(void* ptr, void* user_data), void* user_data = nullptr);
 
     // Obsolete names (will be removed soon)
     // Prefer using '#define IMGUI_ENABLE_FREETYPE'