From 072c57b0ca6523df27366c010c37934d7a0eede5 Mon Sep 17 00:00:00 2001
From: ocornut <omarcornut@gmail.com>
Date: Sat, 21 Mar 2015 19:30:46 +0000
Subject: [PATCH] Setting io.LogFilename to NULL disable default LogToFile()
 (part of #175)

---
 imgui.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/imgui.cpp b/imgui.cpp
index 12e25ca4..a97d0771 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -4394,7 +4394,11 @@ void ImGui::LogToFile(int max_depth, const char* filename)
     if (g.LogEnabled)
         return;
     if (!filename)
+    {
         filename = g.IO.LogFilename;
+        if (!filename)
+            return;
+    }
 
     g.LogFile = fopen(filename, "ab");
     if (!g.LogFile)