mirror of https://github.com/ocornut/imgui
Moved IM_NEW, IM_DELETE helpers to imgui.h for convenient use by back-ends and user code.
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imgui.h
10
imgui.h
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@ -1177,6 +1177,16 @@ public:
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inline bool contains(const value_type& v) const { const T* data = Data; const T* data_end = Data + Size; while (data < data_end) if (*data++ == v) return true; return false; }
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};
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// Helper: IM_NEW(), IM_PLACEMENT_NEW(), IM_DELETE() macros to call MemAlloc + Placement New, Placement Delete + MemFree
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// We call C++ constructor on own allocated memory via the placement "new(ptr) Type()" syntax.
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// Defining a custom placement new() with a dummy parameter allows us to bypass including <new> which on some platforms complains when user has disabled exceptions.
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struct ImNewDummy {};
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inline void* operator new(size_t, ImNewDummy, void* ptr) { return ptr; }
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inline void operator delete(void*, ImNewDummy, void*) {} // This is only required so we can use the symetrical new()
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#define IM_PLACEMENT_NEW(_PTR) new(ImNewDummy(), _PTR)
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#define IM_NEW(_TYPE) new(ImNewDummy(), ImGui::MemAlloc(sizeof(_TYPE))) _TYPE
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template<typename T> void IM_DELETE(T*& p) { if (p) { p->~T(); ImGui::MemFree(p); p = NULL; } }
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// Helper: execute a block of code at maximum once a frame. Convenient if you want to quickly create an UI within deep-nested code that runs multiple times every frame.
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// Usage: static ImGuiOnceUponAFrame oaf; if (oaf) ImGui::Text("This will be called only once per frame");
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struct ImGuiOnceUponAFrame
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@ -165,15 +165,6 @@ static inline ImVec2 ImRotate(const ImVec2& v, float cos_a, float sin_a)
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static inline float ImLinearSweep(float current, float target, float speed) { if (current < target) return ImMin(current + speed, target); if (current > target) return ImMax(current - speed, target); return current; }
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static inline ImVec2 ImMul(const ImVec2& lhs, const ImVec2& rhs) { return ImVec2(lhs.x * rhs.x, lhs.y * rhs.y); }
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// We call C++ constructor on own allocated memory via the placement "new(ptr) Type()" syntax.
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// Defining a custom placement new() with a dummy parameter allows us to bypass including <new> which on some platforms complains when user has disabled exceptions.
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struct ImNewPlacementDummy {};
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inline void* operator new(size_t, ImNewPlacementDummy, void* ptr) { return ptr; }
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inline void operator delete(void*, ImNewPlacementDummy, void*) {} // This is only required so we can use the symetrical new()
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#define IM_PLACEMENT_NEW(_PTR) new(ImNewPlacementDummy(), _PTR)
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#define IM_NEW(_TYPE) new(ImNewPlacementDummy(), ImGui::MemAlloc(sizeof(_TYPE))) _TYPE
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template <typename T> void IM_DELETE(T*& p) { if (p) { p->~T(); ImGui::MemFree(p); p = NULL; } }
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//-----------------------------------------------------------------------------
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// Types
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//-----------------------------------------------------------------------------
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