Added IO.MetricsAllocs counter (number of memory allocations

imgui.cpp

@@ -1787,11 +1787,13 @@ static void AddWindowToRenderList(ImVector<ImDrawList*>& out_render_list, ImGuiW
 
 void* ImGui::MemAlloc(size_t sz)
 {
+    GImGui->IO.MetricsAllocs++;
     return GImGui->IO.MemAllocFn(sz);
 }
 
 void ImGui::MemFree(void* ptr)
 {
+    GImGui->IO.MetricsAllocs--;
     return GImGui->IO.MemFreeFn(ptr);
 }
     
@@ -11039,6 +11041,7 @@ void ImGui::ShowMetricsWindow(bool* opened)
         ImGui::Text("ImGui %s", ImGui::GetVersion());
         ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
         ImGui::Text("%d vertices", ImGui::GetIO().MetricsRenderVertices);
+        ImGui::Text("%d active allocations", ImGui::GetIO().MetricsAllocs);
         ImGui::Separator();
 
         struct Funcs

imgui.h

@@ -696,6 +696,7 @@ struct ImGuiIO
     bool        WantCaptureMouse;           // Mouse is hovering a window or widget is active (= ImGui will use your mouse input)
     bool        WantCaptureKeyboard;        // Widget is active (= ImGui will use your keyboard input)
     float       Framerate;                  // Framerate estimation, in frame per second. Rolling average estimation based on IO.DeltaTime over 120 frames
+    int         MetricsAllocs;              // Number of active memory allocations
     int         MetricsRenderVertices;      // Vertices processed during last call to Render()
 
     //------------------------------------------------------------------