Function MallocWrapper

src/third-party/imgui/imgui.cpp:1019–1019

// - DLL users: read comments above.
#ifndef IMGUI_DISABLE_DEFAULT_ALLOCATORS
static void*   MallocWrapper(size_t size, void* user_data)    { IM_UNUSED(user_data); return malloc(size); }
static void    FreeWrapper(void* ptr, void* user_data)        { IM_UNUSED(user_data); free(ptr); }
#else
static void*   MallocWrapper(size_t size, void* user_data)    { IM_UNUSED(user_data); IM_UNUSED(size); IM_ASSERT(0); return NULL; }