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