Using range-based for where it makes sense. (#4537)

imgui.cpp

@@ -2551,16 +2551,15 @@ void ImGuiTextFilter::Build()
     input_range.split(',', &Filters);
 
     CountGrep = 0;
-    for (int i = 0; i != Filters.Size; i++)
+    for (ImGuiTextRange& f : Filters)
     {
-        ImGuiTextRange& f = Filters[i];
         while (f.b < f.e && ImCharIsBlankA(f.b[0]))
             f.b++;
         while (f.e > f.b && ImCharIsBlankA(f.e[-1]))
             f.e--;
         if (f.empty())
             continue;
-        if (Filters[i].b[0] != '-')
+        if (f.b[0] != '-')
             CountGrep += 1;
     }
 }
@@ -2573,9 +2572,8 @@ bool ImGuiTextFilter::PassFilter(const char* text, const char* text_end) const
     if (text == NULL)
         text = "";
 
-    for (int i = 0; i != Filters.Size; i++)
+    for (const ImGuiTextRange& f : Filters)
     {
-        const ImGuiTextRange& f = Filters[i];
         if (f.empty())
             continue;
         if (f.b[0] == '-')
@@ -2964,14 +2962,14 @@ static bool ImGuiListClipper_StepInternal(ImGuiListClipper* clipper)
         // - Very important: when a starting position is after our maximum item, we set Min to (ItemsCount - 1). This allows us to handle most forms of wrapping.
         // - Due to how Selectable extra padding they tend to be "unaligned" with exact unit in the item list,
         //   which with the flooring/ceiling tend to lead to 2 items instead of one being submitted.
-        for (int i = 0; i < data->Ranges.Size; i++)
+        for (ImGuiListClipperRange& range : data->Ranges)
-            if (data->Ranges[i].PosToIndexConvert)
+            if (range.PosToIndexConvert)
             {
-                int m1 = (int)(((double)data->Ranges[i].Min - window->DC.CursorPos.y - data->LossynessOffset) / clipper->ItemsHeight);
+                int m1 = (int)(((double)range.Min - window->DC.CursorPos.y - data->LossynessOffset) / clipper->ItemsHeight);
-                int m2 = (int)((((double)data->Ranges[i].Max - window->DC.CursorPos.y - data->LossynessOffset) / clipper->ItemsHeight) + 0.999999f);
+                int m2 = (int)((((double)range.Max - window->DC.CursorPos.y - data->LossynessOffset) / clipper->ItemsHeight) + 0.999999f);
-                data->Ranges[i].Min = ImClamp(already_submitted + m1 + data->Ranges[i].PosToIndexOffsetMin, already_submitted, clipper->ItemsCount - 1);
+                range.Min = ImClamp(already_submitted + m1 + range.PosToIndexOffsetMin, already_submitted, clipper->ItemsCount - 1);
-                data->Ranges[i].Max = ImClamp(already_submitted + m2 + data->Ranges[i].PosToIndexOffsetMax, data->Ranges[i].Min + 1, clipper->ItemsCount);
+                range.Max = ImClamp(already_submitted + m2 + range.PosToIndexOffsetMax, range.Min + 1, clipper->ItemsCount);
-                data->Ranges[i].PosToIndexConvert = false;
+                range.PosToIndexConvert = false;
             }
         ImGuiListClipper_SortAndFuseRanges(data->Ranges, data->StepNo);
     }
@@ -3482,13 +3480,12 @@ void ImGui::RenderMouseCursor(ImVec2 base_pos, float base_scale, ImGuiMouseCurso
     ImGuiContext& g = *GImGui;
     IM_ASSERT(mouse_cursor > ImGuiMouseCursor_None && mouse_cursor < ImGuiMouseCursor_COUNT);
     ImFontAtlas* font_atlas = g.DrawListSharedData.Font->ContainerAtlas;
-    for (int n = 0; n < g.Viewports.Size; n++)
+    for (ImGuiViewportP* viewport : g.Viewports)
     {
         // We scale cursor with current viewport/monitor, however Windows 10 for its own hardware cursor seems to be using a different scale factor.
         ImVec2 offset, size, uv[4];
         if (!font_atlas->GetMouseCursorTexData(mouse_cursor, &offset, &size, &uv[0], &uv[2]))
             continue;
-        ImGuiViewportP* viewport = g.Viewports[n];
         const ImVec2 pos = base_pos - offset;
         const float scale = base_scale;
         if (!viewport->GetMainRect().Overlaps(ImRect(pos, pos + ImVec2(size.x + 2, size.y + 2) * scale)))
@@ -3707,9 +3704,9 @@ void ImGui::RemoveContextHook(ImGuiContext* ctx, ImGuiID hook_id)
 {
     ImGuiContext& g = *ctx;
     IM_ASSERT(hook_id != 0);
-    for (int n = 0; n < g.Hooks.Size; n++)
+    for (ImGuiContextHook& hook : g.Hooks)
-        if (g.Hooks[n].HookId == hook_id)
+        if (hook.HookId == hook_id)
-            g.Hooks[n].Type = ImGuiContextHookType_PendingRemoval_;
+            hook.Type = ImGuiContextHookType_PendingRemoval_;
 }
 
 // Call context hooks (used by e.g. test engine)
@@ -3717,9 +3714,9 @@ void ImGui::RemoveContextHook(ImGuiContext* ctx, ImGuiID hook_id)
 void ImGui::CallContextHooks(ImGuiContext* ctx, ImGuiContextHookType hook_type)
 {
     ImGuiContext& g = *ctx;
-    for (int n = 0; n < g.Hooks.Size; n++)
+    for (ImGuiContextHook& hook : g.Hooks)
-        if (g.Hooks[n].Type == hook_type)
+        if (hook.Type == hook_type)
-            g.Hooks[n].Callback(&g, &g.Hooks[n]);
+            hook.Callback(&g, &hook);
 }
 
 
@@ -4554,8 +4551,8 @@ void ImGui::NewFrame()
     SetCurrentFont(GetDefaultFont());
     IM_ASSERT(g.Font->IsLoaded());
     ImRect virtual_space(FLT_MAX, FLT_MAX, -FLT_MAX, -FLT_MAX);
-    for (int n = 0; n < g.Viewports.Size; n++)
+    for (ImGuiViewportP* viewport : g.Viewports)
-        virtual_space.Add(g.Viewports[n]->GetMainRect());
+        virtual_space.Add(viewport->GetMainRect());
     g.DrawListSharedData.ClipRectFullscreen = virtual_space.ToVec4();
     g.DrawListSharedData.CurveTessellationTol = g.Style.CurveTessellationTol;
     g.DrawListSharedData.SetCircleTessellationMaxError(g.Style.CircleTessellationMaxError);
@@ -4570,8 +4567,8 @@ void ImGui::NewFrame()
         g.DrawListSharedData.InitialFlags |= ImDrawListFlags_AllowVtxOffset;
 
     // Mark rendering data as invalid to prevent user who may have a handle on it to use it.
-    for (int n = 0; n < g.Viewports.Size; n++)
+    for (ImGuiViewportP* viewport : g.Viewports)
-        g.Viewports[n]->DrawDataP.Valid = false;
+        viewport->DrawDataP.Valid = false;
 
     // Drag and drop keep the source ID alive so even if the source disappear our state is consistent
     if (g.DragDropActive && g.DragDropPayload.SourceId == g.ActiveId)
@@ -4717,9 +4714,8 @@ void ImGui::NewFrame()
     // Mark all windows as not visible and compact unused memory.
     IM_ASSERT(g.WindowsFocusOrder.Size <= g.Windows.Size);
     const float memory_compact_start_time = (g.GcCompactAll || g.IO.ConfigMemoryCompactTimer < 0.0f) ? FLT_MAX : (float)g.Time - g.IO.ConfigMemoryCompactTimer;
-    for (int i = 0; i != g.Windows.Size; i++)
+    for (ImGuiWindow* window : g.Windows)
     {
-        ImGuiWindow* window = g.Windows[i];
         window->WasActive = window->Active;
         window->Active = false;
         window->WriteAccessed = false;
@@ -4735,9 +4731,9 @@ void ImGui::NewFrame()
     for (int i = 0; i < g.TablesLastTimeActive.Size; i++)
         if (g.TablesLastTimeActive[i] >= 0.0f && g.TablesLastTimeActive[i] < memory_compact_start_time)
             TableGcCompactTransientBuffers(g.Tables.GetByIndex(i));
-    for (int i = 0; i < g.TablesTempData.Size; i++)
+    for (ImGuiTableTempData& table_temp_data : g.TablesTempData)
-        if (g.TablesTempData[i].LastTimeActive >= 0.0f && g.TablesTempData[i].LastTimeActive < memory_compact_start_time)
+        if (table_temp_data.LastTimeActive >= 0.0f && table_temp_data.LastTimeActive < memory_compact_start_time)
-            TableGcCompactTransientBuffers(&g.TablesTempData[i]);
+            TableGcCompactTransientBuffers(&table_temp_data);
     if (g.GcCompactAll)
         GcCompactTransientMiscBuffers();
     g.GcCompactAll = false;
@@ -4817,12 +4813,9 @@ static void AddWindowToDrawData(ImGuiWindow* window, int layer)
     ImGuiViewportP* viewport = g.Viewports[0];
     g.IO.MetricsRenderWindows++;
     ImGui::AddDrawListToDrawDataEx(&viewport->DrawDataP, viewport->DrawDataBuilder.Layers[layer], window->DrawList);
-    for (int i = 0; i < window->DC.ChildWindows.Size; i++)
+    for (ImGuiWindow* child : window->DC.ChildWindows)
-    {
-        ImGuiWindow* child = window->DC.ChildWindows[i];
         if (IsWindowActiveAndVisible(child)) // Clipped children may have been marked not active
             AddWindowToDrawData(child, layer);
-    }
 }
 
 static inline int GetWindowDisplayLayer(ImGuiWindow* window)
@@ -5047,9 +5040,8 @@ void ImGui::EndFrame()
     // We cannot do that on FocusWindow() because children may not exist yet
     g.WindowsTempSortBuffer.resize(0);
     g.WindowsTempSortBuffer.reserve(g.Windows.Size);
-    for (int i = 0; i != g.Windows.Size; i++)
+    for (ImGuiWindow* window : g.Windows)
     {
-        ImGuiWindow* window = g.Windows[i];
         if (window->Active && (window->Flags & ImGuiWindowFlags_ChildWindow))       // if a child is active its parent will add it
             continue;
         AddWindowToSortBuffer(&g.WindowsTempSortBuffer, window);
@@ -5092,9 +5084,8 @@ void ImGui::Render()
     RenderDimmedBackgrounds();
 
     // Add background ImDrawList (for each active viewport)
-    for (int n = 0; n != g.Viewports.Size; n++)
+    for (ImGuiViewportP* viewport : g.Viewports)
     {
-        ImGuiViewportP* viewport = g.Viewports[n];
         InitViewportDrawData(viewport);
         if (viewport->BgFgDrawLists[0] != NULL)
             AddDrawListToDrawDataEx(&viewport->DrawDataP, viewport->DrawDataBuilder.Layers[0], GetBackgroundDrawList(viewport));
@@ -5104,9 +5095,8 @@ void ImGui::Render()
     ImGuiWindow* windows_to_render_top_most[2];
     windows_to_render_top_most[0] = (g.NavWindowingTarget && !(g.NavWindowingTarget->Flags & ImGuiWindowFlags_NoBringToFrontOnFocus)) ? g.NavWindowingTarget->RootWindow : NULL;
     windows_to_render_top_most[1] = (g.NavWindowingTarget ? g.NavWindowingListWindow : NULL);
-    for (int n = 0; n != g.Windows.Size; n++)
+    for (ImGuiWindow* window : g.Windows)
     {
-        ImGuiWindow* window = g.Windows[n];
         IM_MSVC_WARNING_SUPPRESS(6011); // Static Analysis false positive "warning C6011: Dereferencing NULL pointer 'window'"
         if (IsWindowActiveAndVisible(window) && (window->Flags & ImGuiWindowFlags_ChildWindow) == 0 && window != windows_to_render_top_most[0] && window != windows_to_render_top_most[1])
             AddRootWindowToDrawData(window);
@@ -5121,9 +5111,8 @@ void ImGui::Render()
 
     // Setup ImDrawData structures for end-user
     g.IO.MetricsRenderVertices = g.IO.MetricsRenderIndices = 0;
-    for (int n = 0; n < g.Viewports.Size; n++)
+    for (ImGuiViewportP* viewport : g.Viewports)
     {
-        ImGuiViewportP* viewport = g.Viewports[n];
         FlattenDrawDataIntoSingleLayer(&viewport->DrawDataBuilder);
 
         // Add foreground ImDrawList (for each active viewport)
@@ -5133,8 +5122,8 @@ void ImGui::Render()
         // We call _PopUnusedDrawCmd() last thing, as RenderDimmedBackgrounds() rely on a valid command being there (especially in docking branch).
         ImDrawData* draw_data = &viewport->DrawDataP;
         IM_ASSERT(draw_data->CmdLists.Size == draw_data->CmdListsCount);
-        for (int draw_list_n = 0; draw_list_n < draw_data->CmdLists.Size; draw_list_n++)
+        for (ImDrawList* draw_list : draw_data->CmdLists)
-            draw_data->CmdLists[draw_list_n]->_PopUnusedDrawCmd();
+            draw_list->_PopUnusedDrawCmd();
 
         g.IO.MetricsRenderVertices += draw_data->TotalVtxCount;
         g.IO.MetricsRenderIndices += draw_data->TotalIdxCount;
@@ -6199,9 +6188,9 @@ ImGuiWindow* ImGui::FindBlockingModal(ImGuiWindow* window)
         return NULL;
 
     // Find a modal that has common parent with specified window. Specified window should be positioned behind that modal.
-    for (int i = 0; i < g.OpenPopupStack.Size; i++)
+    for (ImGuiPopupData& popup_data : g.OpenPopupStack)
     {
-        ImGuiWindow* popup_window = g.OpenPopupStack.Data[i].Window;
+        ImGuiWindow* popup_window = popup_data.Window;
         if (popup_window == NULL || !(popup_window->Flags & ImGuiWindowFlags_Modal))
             continue;
         if (!popup_window->Active && !popup_window->WasActive)      // Check WasActive, because this code may run before popup renders on current frame, also check Active to handle newly created windows.
@@ -12967,9 +12956,9 @@ ImGuiSettingsHandler* ImGui::FindSettingsHandler(const char* type_name)
 {
     ImGuiContext& g = *GImGui;
     const ImGuiID type_hash = ImHashStr(type_name);
-    for (int handler_n = 0; handler_n < g.SettingsHandlers.Size; handler_n++)
+    for (ImGuiSettingsHandler& handler : g.SettingsHandlers)
-        if (g.SettingsHandlers[handler_n].TypeHash == type_hash)
+        if (handler.TypeHash == type_hash)
-            return &g.SettingsHandlers[handler_n];
+            return &handler;
     return NULL;
 }
 
@@ -12978,9 +12967,9 @@ void ImGui::ClearIniSettings()
 {
     ImGuiContext& g = *GImGui;
     g.SettingsIniData.clear();
-    for (int handler_n = 0; handler_n < g.SettingsHandlers.Size; handler_n++)
+    for (ImGuiSettingsHandler& handler : g.SettingsHandlers)
-        if (g.SettingsHandlers[handler_n].ClearAllFn)
+        if (handler.ClearAllFn != NULL)
-            g.SettingsHandlers[handler_n].ClearAllFn(&g, &g.SettingsHandlers[handler_n]);
+            handler.ClearAllFn(&g, &handler);
 }
 
 void ImGui::LoadIniSettingsFromDisk(const char* ini_filename)
@@ -13015,9 +13004,9 @@ void ImGui::LoadIniSettingsFromMemory(const char* ini_data, size_t ini_size)
 
     // Call pre-read handlers
     // Some types will clear their data (e.g. dock information) some types will allow merge/override (window)
-    for (int handler_n = 0; handler_n < g.SettingsHandlers.Size; handler_n++)
+    for (ImGuiSettingsHandler& handler : g.SettingsHandlers)
-        if (g.SettingsHandlers[handler_n].ReadInitFn)
+        if (handler.ReadInitFn != NULL)
-            g.SettingsHandlers[handler_n].ReadInitFn(&g, &g.SettingsHandlers[handler_n]);
+            handler.ReadInitFn(&g, &handler);
 
     void* entry_data = NULL;
     ImGuiSettingsHandler* entry_handler = NULL;
@@ -13061,9 +13050,9 @@ void ImGui::LoadIniSettingsFromMemory(const char* ini_data, size_t ini_size)
     memcpy(buf, ini_data, ini_size);
 
     // Call post-read handlers
-    for (int handler_n = 0; handler_n < g.SettingsHandlers.Size; handler_n++)
+    for (ImGuiSettingsHandler& handler : g.SettingsHandlers)
-        if (g.SettingsHandlers[handler_n].ApplyAllFn)
+        if (handler.ApplyAllFn != NULL)
-            g.SettingsHandlers[handler_n].ApplyAllFn(&g, &g.SettingsHandlers[handler_n]);
+            handler.ApplyAllFn(&g, &handler);
 }
 
 void ImGui::SaveIniSettingsToDisk(const char* ini_filename)
@@ -13089,11 +13078,8 @@ const char* ImGui::SaveIniSettingsToMemory(size_t* out_size)
     g.SettingsDirtyTimer = 0.0f;
     g.SettingsIniData.Buf.resize(0);
     g.SettingsIniData.Buf.push_back(0);
-    for (int handler_n = 0; handler_n < g.SettingsHandlers.Size; handler_n++)
+    for (ImGuiSettingsHandler& handler : g.SettingsHandlers)
-    {
+        handler.WriteAllFn(&g, &handler, &g.SettingsIniData);
-        ImGuiSettingsHandler* handler = &g.SettingsHandlers[handler_n];
-        handler->WriteAllFn(&g, handler, &g.SettingsIniData);
-    }
     if (out_size)
         *out_size = (size_t)g.SettingsIniData.size();
     return g.SettingsIniData.c_str();
@@ -13159,8 +13145,8 @@ void ImGui::ClearWindowSettings(const char* name)
 static void WindowSettingsHandler_ClearAll(ImGuiContext* ctx, ImGuiSettingsHandler*)
 {
     ImGuiContext& g = *ctx;
-    for (int i = 0; i != g.Windows.Size; i++)
+    for (ImGuiWindow* window : g.Windows)
-        g.Windows[i]->SettingsOffset = -1;
+        window->SettingsOffset = -1;
     g.SettingsWindows.clear();
 }
 
@@ -13205,9 +13191,8 @@ static void WindowSettingsHandler_WriteAll(ImGuiContext* ctx, ImGuiSettingsHandl
     // Gather data from windows that were active during this session
     // (if a window wasn't opened in this session we preserve its settings)
     ImGuiContext& g = *ctx;
-    for (int i = 0; i != g.Windows.Size; i++)
+    for (ImGuiWindow* window : g.Windows)
     {
-        ImGuiWindow* window = g.Windows[i];
         if (window->Flags & ImGuiWindowFlags_NoSavedSettings)
             continue;
 
@@ -13286,10 +13271,8 @@ static void ImGui::UpdateViewportsNewFrame()
     main_viewport->Pos = ImVec2(0.0f, 0.0f);
     main_viewport->Size = g.IO.DisplaySize;
 
-    for (int n = 0; n < g.Viewports.Size; n++)
+    for (ImGuiViewportP* viewport : g.Viewports)
     {
-        ImGuiViewportP* viewport = g.Viewports[n];
-
         // Lock down space taken by menu bars and status bars, reset the offset for fucntions like BeginMainMenuBar() to alter them again.
         viewport->WorkOffsetMin = viewport->BuildWorkOffsetMin;
         viewport->WorkOffsetMax = viewport->BuildWorkOffsetMax;
@@ -13507,9 +13490,8 @@ void ImGui::DebugRenderViewportThumbnail(ImDrawList* draw_list, ImGuiViewportP*
     ImVec2 off = bb.Min - viewport->Pos * scale;
     float alpha_mul = 1.0f;
     window->DrawList->AddRectFilled(bb.Min, bb.Max, GetColorU32(ImGuiCol_Border, alpha_mul * 0.40f));
-    for (int i = 0; i != g.Windows.Size; i++)
+    for (ImGuiWindow* thumb_window : g.Windows)
     {
-        ImGuiWindow* thumb_window = g.Windows[i];
         if (!thumb_window->WasActive || (thumb_window->Flags & ImGuiWindowFlags_ChildWindow))
             continue;
 
@@ -13536,13 +13518,12 @@ static void RenderViewportsThumbnails()
     // We don't display full monitor bounds (we could, but it often looks awkward), instead we display just enough to cover all of our viewports.
     float SCALE = 1.0f / 8.0f;
     ImRect bb_full(FLT_MAX, FLT_MAX, -FLT_MAX, -FLT_MAX);
-    for (int n = 0; n < g.Viewports.Size; n++)
+    for (ImGuiViewportP* viewport : g.Viewports)
-        bb_full.Add(g.Viewports[n]->GetMainRect());
+        bb_full.Add(viewport->GetMainRect());
     ImVec2 p = window->DC.CursorPos;
     ImVec2 off = p - bb_full.Min * SCALE;
-    for (int n = 0; n < g.Viewports.Size; n++)
+    for (ImGuiViewportP* viewport : g.Viewports)
     {
-        ImGuiViewportP* viewport = g.Viewports[n];
         ImRect viewport_draw_bb(off + (viewport->Pos) * SCALE, off + (viewport->Pos + viewport->Size) * SCALE);
         ImGui::DebugRenderViewportThumbnail(window->DrawList, viewport, viewport_draw_bb);
     }
@@ -13650,9 +13631,8 @@ static void MetricsHelpMarker(const char* desc)
 // [DEBUG] List fonts in a font atlas and display its texture
 void ImGui::ShowFontAtlas(ImFontAtlas* atlas)
 {
-    for (int i = 0; i < atlas->Fonts.Size; i++)
+    for (ImFont* font : atlas->Fonts)
     {
-        ImFont* font = atlas->Fonts[i];
         PushID(font);
         DebugNodeFont(font);
         PopID();
@@ -13853,9 +13833,9 @@ void ImGui::ShowMetricsWindow(bool* p_open)
             // Here we display windows in their submitted order/hierarchy, however note that the Begin stack doesn't constitute a Parent<>Child relationship!
             ImVector<ImGuiWindow*>& temp_buffer = g.WindowsTempSortBuffer;
             temp_buffer.resize(0);
-            for (int i = 0; i < g.Windows.Size; i++)
+            for (ImGuiWindow* window : g.Windows)
-                if (g.Windows[i]->LastFrameActive + 1 >= g.FrameCount)
+                if (window->LastFrameActive + 1 >= g.FrameCount)
-                    temp_buffer.push_back(g.Windows[i]);
+                    temp_buffer.push_back(window);
             struct Func { static int IMGUI_CDECL WindowComparerByBeginOrder(const void* lhs, const void* rhs) { return ((int)(*(const ImGuiWindow* const *)lhs)->BeginOrderWithinContext - (*(const ImGuiWindow* const*)rhs)->BeginOrderWithinContext); } };
             ImQsort(temp_buffer.Data, (size_t)temp_buffer.Size, sizeof(ImGuiWindow*), Func::WindowComparerByBeginOrder);
             DebugNodeWindowsListByBeginStackParent(temp_buffer.Data, temp_buffer.Size, NULL);
@@ -13867,18 +13847,15 @@ void ImGui::ShowMetricsWindow(bool* p_open)
 
     // DrawLists
     int drawlist_count = 0;
-    for (int viewport_i = 0; viewport_i < g.Viewports.Size; viewport_i++)
+    for (ImGuiViewportP* viewport : g.Viewports)
-        drawlist_count += g.Viewports[viewport_i]->DrawDataP.CmdLists.Size;
+        drawlist_count += viewport->DrawDataP.CmdLists.Size;
     if (TreeNode("DrawLists", "DrawLists (%d)", drawlist_count))
     {
         Checkbox("Show ImDrawCmd mesh when hovering", &cfg->ShowDrawCmdMesh);
         Checkbox("Show ImDrawCmd bounding boxes when hovering", &cfg->ShowDrawCmdBoundingBoxes);
-        for (int viewport_i = 0; viewport_i < g.Viewports.Size; viewport_i++)
+        for (ImGuiViewportP* viewport : g.Viewports)
-        {
+            for (ImDrawList* draw_list : viewport->DrawDataP.CmdLists)
-            ImGuiViewportP* viewport = g.Viewports[viewport_i];
+                DebugNodeDrawList(NULL, viewport, draw_list, "DrawList");
-            for (int draw_list_i = 0; draw_list_i < viewport->DrawDataP.CmdLists.Size; draw_list_i++)
-                DebugNodeDrawList(NULL, viewport, viewport->DrawDataP.CmdLists[draw_list_i], "DrawList");
-        }
         TreePop();
     }
 
@@ -13888,22 +13865,21 @@ void ImGui::ShowMetricsWindow(bool* p_open)
         Indent(GetTreeNodeToLabelSpacing());
         RenderViewportsThumbnails();
         Unindent(GetTreeNodeToLabelSpacing());
-        for (int i = 0; i < g.Viewports.Size; i++)
+        for (ImGuiViewportP* viewport : g.Viewports)
-            DebugNodeViewport(g.Viewports[i]);
+            DebugNodeViewport(viewport);
         TreePop();
     }
 
     // Details for Popups
     if (TreeNode("Popups", "Popups (%d)", g.OpenPopupStack.Size))
     {
-        for (int i = 0; i < g.OpenPopupStack.Size; i++)
+        for (const ImGuiPopupData& popup_data : g.OpenPopupStack)
         {
             // As it's difficult to interact with tree nodes while popups are open, we display everything inline.
-            const ImGuiPopupData* popup_data = &g.OpenPopupStack[i];
+            ImGuiWindow* window = popup_data.Window;
-            ImGuiWindow* window = popup_data->Window;
             BulletText("PopupID: %08x, Window: '%s' (%s%s), BackupNavWindow '%s', ParentWindow '%s'",
-                popup_data->PopupId, window ? window->Name : "NULL", window && (window->Flags & ImGuiWindowFlags_ChildWindow) ? "Child;" : "", window && (window->Flags & ImGuiWindowFlags_ChildMenu) ? "Menu;" : "",
+                popup_data.PopupId, window ? window->Name : "NULL", window && (window->Flags & ImGuiWindowFlags_ChildWindow) ? "Child;" : "", window && (window->Flags & ImGuiWindowFlags_ChildMenu) ? "Menu;" : "",
-                popup_data->BackupNavWindow ? popup_data->BackupNavWindow->Name : "NULL", window && window->ParentWindow ? window->ParentWindow->Name : "NULL");
+                popup_data.BackupNavWindow ? popup_data.BackupNavWindow->Name : "NULL", window && window->ParentWindow ? window->ParentWindow->Name : "NULL");
         }
         TreePop();
     }
@@ -13973,8 +13949,8 @@ void ImGui::ShowMetricsWindow(bool* p_open)
         Text("SettingsDirtyTimer %.2f", g.SettingsDirtyTimer);
         if (TreeNode("SettingsHandlers", "Settings handlers: (%d)", g.SettingsHandlers.Size))
         {
-            for (int n = 0; n < g.SettingsHandlers.Size; n++)
+            for (ImGuiSettingsHandler& handler : g.SettingsHandlers)
-                BulletText("\"%s\"", g.SettingsHandlers[n].TypeName);
+                BulletText("\"%s\"", handler.TypeName);
             TreePop();
         }
         if (TreeNode("SettingsWindows", "Settings packed data: Windows: %d bytes", g.SettingsWindows.size()))
@@ -14138,9 +14114,8 @@ void ImGui::ShowMetricsWindow(bool* p_open)
     // Overlay: Display windows Rectangles and Begin Order
     if (cfg->ShowWindowsRects || cfg->ShowWindowsBeginOrder)
     {
-        for (int n = 0; n < g.Windows.Size; n++)
+        for (ImGuiWindow* window : g.Windows)
         {
-            ImGuiWindow* window = g.Windows[n];
             if (!window->WasActive)
                 continue;
             ImDrawList* draw_list = GetForegroundDrawList(window);
@@ -14203,8 +14178,8 @@ void ImGui::DebugNodeColumns(ImGuiOldColumns* columns)
     if (!TreeNode((void*)(uintptr_t)columns->ID, "Columns Id: 0x%08X, Count: %d, Flags: 0x%04X", columns->ID, columns->Count, columns->Flags))
         return;
     BulletText("Width: %.1f (MinX: %.1f, MaxX: %.1f)", columns->OffMaxX - columns->OffMinX, columns->OffMinX, columns->OffMaxX);
-    for (int column_n = 0; column_n < columns->Columns.Size; column_n++)
+    for (ImGuiOldColumnData& column : columns->Columns)
-        BulletText("Column %02d: OffsetNorm %.3f (= %.1f px)", column_n, columns->Columns[column_n].OffsetNorm, GetColumnOffsetFromNorm(columns, columns->Columns[column_n].OffsetNorm));
+        BulletText("Column %02d: OffsetNorm %.3f (= %.1f px)", (int)columns->Columns.index_from_ptr(&column), column.OffsetNorm, GetColumnOffsetFromNorm(columns, column.OffsetNorm));
     TreePop();
 }
 
@@ -14439,11 +14414,8 @@ void ImGui::DebugNodeStorage(ImGuiStorage* storage, const char* label)
 {
     if (!TreeNode(label, "%s: %d entries, %d bytes", label, storage->Data.Size, storage->Data.size_in_bytes()))
         return;
-    for (int n = 0; n < storage->Data.Size; n++)
+    for (const ImGuiStorage::ImGuiStoragePair& p : storage->Data)
-    {
-        const ImGuiStorage::ImGuiStoragePair& p = storage->Data[n];
         BulletText("Key 0x%08X Value { i: %d }", p.key, p.val_i); // Important: we currently don't store a type, real value may not be integer.
-    }
     TreePop();
 }
 
@@ -14501,8 +14473,8 @@ void ImGui::DebugNodeViewport(ImGuiViewportP* viewport)
             (flags & ImGuiViewportFlags_IsPlatformWindow)  ? " IsPlatformWindow"  : "",
             (flags & ImGuiViewportFlags_IsPlatformMonitor) ? " IsPlatformMonitor" : "",
             (flags & ImGuiViewportFlags_OwnedByApp)        ? " OwnedByApp"        : "");
-        for (int draw_list_i = 0; draw_list_i < viewport->DrawDataP.CmdLists.Size; draw_list_i++)
+        for (ImDrawList* draw_list : viewport->DrawDataP.CmdLists)
-            DebugNodeDrawList(NULL, viewport, viewport->DrawDataP.CmdLists[draw_list_i], "DrawList");
+            DebugNodeDrawList(NULL, viewport, draw_list, "DrawList");
         TreePop();
     }
 }
@@ -14557,8 +14529,8 @@ void ImGui::DebugNodeWindow(ImGuiWindow* window, const char* label)
     if (window->DC.ChildWindows.Size > 0)   { DebugNodeWindowsList(&window->DC.ChildWindows, "ChildWindows"); }
     if (window->ColumnsStorage.Size > 0 && TreeNode("Columns", "Columns sets (%d)", window->ColumnsStorage.Size))
     {
-        for (int n = 0; n < window->ColumnsStorage.Size; n++)
+        for (ImGuiOldColumns& columns : window->ColumnsStorage)
-            DebugNodeColumns(&window->ColumnsStorage[n]);
+            DebugNodeColumns(&columns);
         TreePop();
     }
     DebugNodeStorage(&window->StateStorage, "Storage");

imgui_demo.cpp

@@ -6230,9 +6230,8 @@ void ImGui::ShowFontSelector(const char* label)
     ImFont* font_current = ImGui::GetFont();
     if (ImGui::BeginCombo(label, font_current->GetDebugName()))
     {
-        for (int n = 0; n < io.Fonts->Fonts.Size; n++)
+        for (ImFont* font : io.Fonts->Fonts)
         {
-            ImFont* font = io.Fonts->Fonts[n];
             ImGui::PushID((void*)font);
             if (ImGui::Selectable(font->GetDebugName(), font == font_current))
                 io.FontDefault = font;
@@ -6840,9 +6839,8 @@ struct ExampleAppConsole
             ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(4, 1)); // Tighten spacing
             if (copy_to_clipboard)
                 ImGui::LogToClipboard();
-            for (int i = 0; i < Items.Size; i++)
+            for (const char* item : Items)
             {
-                const char* item = Items[i];
                 if (!Filter.PassFilter(item))
                     continue;
 
@@ -8027,12 +8025,11 @@ struct ExampleAppDocuments
 // Note that this completely optional, and only affect tab bars with the ImGuiTabBarFlags_Reorderable flag.
 static void NotifyOfDocumentsClosedElsewhere(ExampleAppDocuments& app)
 {
-    for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+    for (MyDocument& doc : app.Documents)
     {
-        MyDocument* doc = &app.Documents[doc_n];
+        if (!doc.Open && doc.OpenPrev)
-        if (!doc->Open && doc->OpenPrev)
+            ImGui::SetTabItemClosed(doc.Name);
-            ImGui::SetTabItemClosed(doc->Name);
+        doc.OpenPrev = doc.Open;
-        doc->OpenPrev = doc->Open;
     }
 }
 
@@ -8057,23 +8054,19 @@ void ShowExampleAppDocuments(bool* p_open)
         if (ImGui::BeginMenu("File"))
         {
             int open_count = 0;
-            for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+            for (MyDocument& doc : app.Documents)
-                open_count += app.Documents[doc_n].Open ? 1 : 0;
+                open_count += doc.Open ? 1 : 0;
 
             if (ImGui::BeginMenu("Open", open_count < app.Documents.Size))
             {
-                for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+                for (MyDocument& doc : app.Documents)
-                {
+                    if (!doc.Open && ImGui::MenuItem(doc.Name))
-                    MyDocument* doc = &app.Documents[doc_n];
+                        doc.DoOpen();
-                    if (!doc->Open)
-                        if (ImGui::MenuItem(doc->Name))
-                            doc->DoOpen();
-                }
                 ImGui::EndMenu();
             }
             if (ImGui::MenuItem("Close All Documents", NULL, false, open_count > 0))
-                for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+                for (MyDocument& doc : app.Documents)
-                    app.Documents[doc_n].DoQueueClose();
+                    doc.DoQueueClose();
             if (ImGui::MenuItem("Exit", "Ctrl+F4") && p_open)
                 *p_open = false;
             ImGui::EndMenu();
@@ -8084,13 +8077,13 @@ void ShowExampleAppDocuments(bool* p_open)
     // [Debug] List documents with one checkbox for each
     for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
     {
-        MyDocument* doc = &app.Documents[doc_n];
+        MyDocument& doc = app.Documents[doc_n];
         if (doc_n > 0)
             ImGui::SameLine();
-        ImGui::PushID(doc);
+        ImGui::PushID(&doc);
-        if (ImGui::Checkbox(doc->Name, &doc->Open))
+        if (ImGui::Checkbox(doc.Name, &doc.Open))
-            if (!doc->Open)
+            if (!doc.Open)
-                doc->DoForceClose();
+                doc.DoForceClose();
         ImGui::PopID();
     }
 
@@ -8119,26 +8112,25 @@ void ShowExampleAppDocuments(bool* p_open)
             //if (ImGui::GetIO().KeyCtrl) ImGui::SetTabItemSelected(docs[1].Name);  // [DEBUG] Test SetTabItemSelected(), probably not very useful as-is anyway..
 
             // Submit Tabs
-            for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+            for (MyDocument& doc : app.Documents)
             {
-                MyDocument* doc = &app.Documents[doc_n];
+                if (!doc.Open)
-                if (!doc->Open)
                     continue;
 
-                ImGuiTabItemFlags tab_flags = (doc->Dirty ? ImGuiTabItemFlags_UnsavedDocument : 0);
+                ImGuiTabItemFlags tab_flags = (doc.Dirty ? ImGuiTabItemFlags_UnsavedDocument : 0);
-                bool visible = ImGui::BeginTabItem(doc->Name, &doc->Open, tab_flags);
+                bool visible = ImGui::BeginTabItem(doc.Name, &doc.Open, tab_flags);
 
                 // Cancel attempt to close when unsaved add to save queue so we can display a popup.
-                if (!doc->Open && doc->Dirty)
+                if (!doc.Open && doc.Dirty)
                 {
-                    doc->Open = true;
+                    doc.Open = true;
-                    doc->DoQueueClose();
+                    doc.DoQueueClose();
                 }
 
-                MyDocument::DisplayContextMenu(doc);
+                MyDocument::DisplayContextMenu(&doc);
                 if (visible)
                 {
-                    MyDocument::DisplayContents(doc);
+                    MyDocument::DisplayContents(&doc);
                     ImGui::EndTabItem();
                 }
             }
@@ -8152,15 +8144,12 @@ void ShowExampleAppDocuments(bool* p_open)
     if (close_queue.empty())
     {
         // Close queue is locked once we started a popup
-        for (int doc_n = 0; doc_n < app.Documents.Size; doc_n++)
+        for (MyDocument& doc : app.Documents)
-        {
+            if (doc.WantClose)
-            MyDocument* doc = &app.Documents[doc_n];
-            if (doc->WantClose)
             {
-                doc->WantClose = false;
+                doc.WantClose = false;
-                close_queue.push_back(doc);
+                close_queue.push_back(&doc);
             }
-        }
     }
 
     // Display closing confirmation UI

imgui_draw.cpp

@@ -1890,15 +1890,9 @@ void ImDrawData::DeIndexAllBuffers()
 // or if there is a difference between your window resolution and framebuffer resolution.
 void ImDrawData::ScaleClipRects(const ImVec2& fb_scale)
 {
-    for (int i = 0; i < CmdListsCount; i++)
+    for (ImDrawList* draw_list : CmdLists)
-    {
+        for (ImDrawCmd& cmd : draw_list->CmdBuffer)
-        ImDrawList* cmd_list = CmdLists[i];
+            cmd.ClipRect = ImVec4(cmd.ClipRect.x * fb_scale.x, cmd.ClipRect.y * fb_scale.y, cmd.ClipRect.z * fb_scale.x, cmd.ClipRect.w * fb_scale.y);
-        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
-        {
-            ImDrawCmd* cmd = &cmd_list->CmdBuffer[cmd_i];
-            cmd->ClipRect = ImVec4(cmd->ClipRect.x * fb_scale.x, cmd->ClipRect.y * fb_scale.y, cmd->ClipRect.z * fb_scale.x, cmd->ClipRect.w * fb_scale.y);
-        }
-    }
 }
 
 //-----------------------------------------------------------------------------
@@ -2039,19 +2033,19 @@ ImFontAtlas::~ImFontAtlas()
 void    ImFontAtlas::ClearInputData()
 {
     IM_ASSERT(!Locked && "Cannot modify a locked ImFontAtlas between NewFrame() and EndFrame/Render()!");
-    for (int i = 0; i < ConfigData.Size; i++)
+    for (ImFontConfig& font_cfg : ConfigData)
-        if (ConfigData[i].FontData && ConfigData[i].FontDataOwnedByAtlas)
+        if (font_cfg.FontData && font_cfg.FontDataOwnedByAtlas)
         {
-            IM_FREE(ConfigData[i].FontData);
+            IM_FREE(font_cfg.FontData);
-            ConfigData[i].FontData = NULL;
+            font_cfg.FontData = NULL;
         }
 
     // When clearing this we lose access to the font name and other information used to build the font.
-    for (int i = 0; i < Fonts.Size; i++)
+    for (ImFont* font : Fonts)
-        if (Fonts[i]->ConfigData >= ConfigData.Data && Fonts[i]->ConfigData < ConfigData.Data + ConfigData.Size)
+        if (font->ConfigData >= ConfigData.Data && font->ConfigData < ConfigData.Data + ConfigData.Size)
         {
-            Fonts[i]->ConfigData = NULL;
+            font->ConfigData = NULL;
-            Fonts[i]->ConfigDataCount = 0;
+            font->ConfigDataCount = 0;
         }
     ConfigData.clear();
     CustomRects.clear();
@@ -2856,9 +2850,9 @@ void ImFontAtlasBuildFinish(ImFontAtlas* atlas)
     }
 
     // Build all fonts lookup tables
-    for (int i = 0; i < atlas->Fonts.Size; i++)
+    for (ImFont* font : atlas->Fonts)
-        if (atlas->Fonts[i]->DirtyLookupTables)
+        if (font->DirtyLookupTables)
-            atlas->Fonts[i]->BuildLookupTable();
+            font->BuildLookupTable();
 
     atlas->TexReady = true;
 }