Using IM_UNUSED() macro.

imgui.cpp

@@ -1063,11 +1063,11 @@ ImGuiContext*   GImGui = NULL;
 // If you use DLL hotreloading you might need to call SetAllocatorFunctions() after reloading code from this file.
 // Otherwise, you probably don't want to modify them mid-program, and if you use global/static e.g. ImVector<> instances you may need to keep them accessible during program destruction.
 #ifndef IMGUI_DISABLE_DEFAULT_ALLOCATORS
-static void*   MallocWrapper(size_t size, void* user_data)    { (void)user_data; return malloc(size); }
+static void*   MallocWrapper(size_t size, void* user_data)    { IM_UNUSED(user_data); return malloc(size); }
-static void    FreeWrapper(void* ptr, void* user_data)        { (void)user_data; free(ptr); }
+static void    FreeWrapper(void* ptr, void* user_data)        { IM_UNUSED(user_data); free(ptr); }
 #else
-static void*   MallocWrapper(size_t size, void* user_data)    { (void)user_data; (void)size; IM_ASSERT(0); return NULL; }
+static void*   MallocWrapper(size_t size, void* user_data)    { IM_UNUSED(user_data); IM_UNUSED(size); IM_ASSERT(0); return NULL; }
-static void    FreeWrapper(void* ptr, void* user_data)        { (void)user_data; (void)ptr; IM_ASSERT(0); }
+static void    FreeWrapper(void* ptr, void* user_data)        { IM_UNUSED(user_data); IM_UNUSED(ptr); IM_ASSERT(0); }
 #endif
 
 static void*  (*GImAllocatorAllocFunc)(size_t size, void* user_data) = MallocWrapper;
@@ -2706,9 +2706,9 @@ void ImGui::MarkItemEdited(ImGuiID id)
 {
     // This marking is solely to be able to provide info for IsItemDeactivatedAfterEdit().
     // ActiveId might have been released by the time we call this (as in the typical press/release button behavior) but still need need to fill the data.
-    (void)id; // Avoid unused variable warnings when asserts are compiled out.
     ImGuiContext& g = *GImGui;
     IM_ASSERT(g.ActiveId == id || g.ActiveId == 0 || g.DragDropActive);
+    IM_UNUSED(id); // Avoid unused variable warnings when asserts are compiled out.
     //IM_ASSERT(g.CurrentWindow->DC.LastItemId == id);
     g.ActiveIdHasBeenEdited = true;
     g.CurrentWindow->DC.LastItemStatusFlags |= ImGuiItemStatusFlags_Edited;
@@ -6918,7 +6918,7 @@ bool ImGui::BeginPopupModal(const char* name, bool* p_open, ImGuiWindowFlags fla
 
 void ImGui::EndPopup()
 {
-    ImGuiContext& g = *GImGui; (void)g;
+    ImGuiContext& g = *GImGui; 
     IM_ASSERT(g.CurrentWindow->Flags & ImGuiWindowFlags_Popup);  // Mismatched BeginPopup()/EndPopup() calls
     IM_ASSERT(g.BeginPopupStack.Size > 0);
 

imgui.h

@@ -72,6 +72,7 @@ Index of this file:
 #endif
 #define IM_ARRAYSIZE(_ARR)          ((int)(sizeof(_ARR)/sizeof(*_ARR)))         // Size of a static C-style array. Don't use on pointers!
 #define IM_OFFSETOF(_TYPE,_MEMBER)  ((size_t)&(((_TYPE*)0)->_MEMBER))           // Offset of _MEMBER within _TYPE. Standardized as offsetof() in modern C++.
+#define IM_UNUSED(_VAR)             ((void)_VAR)                                // Used to silence "unused variable warnings". Often useful as asserts may be stripped out from final builds.
 
 // Warnings
 #if defined(__clang__)
@@ -1494,7 +1495,7 @@ namespace ImGui
     // OBSOLETED in 1.60 (between Dec 2017 and Apr 2018)
     static inline bool  IsAnyWindowFocused()                  { return IsWindowFocused(ImGuiFocusedFlags_AnyWindow); }
     static inline bool  IsAnyWindowHovered()                  { return IsWindowHovered(ImGuiHoveredFlags_AnyWindow); }
-    static inline ImVec2 CalcItemRectClosestPoint(const ImVec2& pos, bool on_edge = false, float outward = 0.f) { (void)on_edge; (void)outward; IM_ASSERT(0); return pos; }
+    static inline ImVec2 CalcItemRectClosestPoint(const ImVec2& pos, bool on_edge = false, float outward = 0.f) { IM_UNUSED(on_edge); IM_UNUSED(outward); IM_ASSERT(0); return pos; }
     // OBSOLETED in 1.53 (between Oct 2017 and Dec 2017)
     static inline void  ShowTestWindow()                      { return ShowDemoWindow(); }
     static inline bool  IsRootWindowFocused()                 { return IsWindowFocused(ImGuiFocusedFlags_RootWindow); }

imgui_widgets.cpp

@@ -6476,9 +6476,9 @@ ImVec2 ImGui::TabItemCalcSize(const char* label, bool has_close_button)
 void ImGui::TabItemBackground(ImDrawList* draw_list, const ImRect& bb, ImGuiTabItemFlags flags, ImU32 col)
 {
     // While rendering tabs, we trim 1 pixel off the top of our bounding box so they can fit within a regular frame height while looking "detached" from it.
-    (void)flags;
     ImGuiContext& g = *GImGui;
     const float width = bb.GetWidth();
+    IM_UNUSED(flags);
     IM_ASSERT(width > 0.0f);
     const float rounding = ImMax(0.0f, ImMin(g.Style.TabRounding, width * 0.5f - 1.0f));
     float y1 = bb.Min.y + 1.0f;

misc/freetype/imgui_freetype.cpp

@@ -569,8 +569,8 @@ bool ImFontAtlasBuildWithFreeType(FT_Library ft_library, ImFontAtlas* atlas, uns
 }
 
 // Default memory allocators
-static void* ImFreeTypeDefaultAllocFunc(size_t size, void* user_data)	{ (void)user_data; return ImGui::MemAlloc(size); }
+static void* ImFreeTypeDefaultAllocFunc(size_t size, void* user_data)	{ IM_UNUSED(user_data); return ImGui::MemAlloc(size); }
-static void  ImFreeTypeDefaultFreeFunc(void* ptr, void* user_data)	    { (void)user_data; ImGui::MemFree(ptr); }
+static void  ImFreeTypeDefaultFreeFunc(void* ptr, void* user_data)	    { IM_UNUSED(user_data); ImGui::MemFree(ptr); }
 
 // Current memory allocators
 static void* (*GImFreeTypeAllocFunc)(size_t size, void* user_data) = ImFreeTypeDefaultAllocFunc;