59 lines
1.9 KiB
C++
59 lines
1.9 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//
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//=============================================================================//
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// Initializers are a way to register your object to be initialized at startup time.
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// They're a good way to have global variables without worrying about dependent
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// constructors being called. They also make it so init code doesn't depend on the
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// global objects it's initializing.
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// To use initializers, just use REGISTER_INITIALIZER to register your global variable like this:
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// class SomeClass {....}
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// SomeClass *g_pSomeClassSingleton = NULL;
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// REGISTER_INITIALIZER(SomeClass, &g_pSomeClassSingleton);
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#ifndef INITIALIZER_H
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#define INITIALIZER_H
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typedef void* (*CreateInitializerObjectFn)();
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typedef void (*DeleteInitializerObjectFn)(void *ptr);
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class Initializer
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{
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public:
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Initializer(void **pVar, CreateInitializerObjectFn createFn, DeleteInitializerObjectFn deleteFn);
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// Allocates all the global objects.
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static bool InitializeAllObjects();
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// Free all the global objects.
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static void FreeAllObjects();
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private:
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static Initializer *s_pInitializers;
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void **m_pVar;
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CreateInitializerObjectFn m_CreateFn;
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DeleteInitializerObjectFn m_DeleteFn;
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Initializer *m_pNext;
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};
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#define REGISTER_INITIALIZER(className, varPointer) \
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static void* __Initializer__Create##className##Fn() {return new className;} \
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static void* __Initializer__Delete##className##Fn(void *ptr) {delete (className*)ptr;} \
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static Initializer g_Initializer_##className##(varPointer, __Initializer__Create##className##Fn, __Initializer__Delete##className##Fn);
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#define REGISTER_FUNCTION_INITIALIZER(functionName) \
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static void* __Initializer__Create##functionName##Fn() { functionName(); return 0; } \
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static Initializer g_Initializer_##functionName##(0, __Initializer__Create##functionName##Fn, 0);
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#endif
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