You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
1.7 KiB
48 lines
1.7 KiB
//========= Copyright © 1996-2005, Valve Corporation, All rights reserved. ============//
|
|
//
|
|
// Purpose: Macros for defining branching singletons.
|
|
//
|
|
// A branching singleton defines a singleton class within another class, and subclasses
|
|
// of the outer class can automatically expand on that singleton at their node in the
|
|
// class branching tree with the confidence that changes will be reflected in all
|
|
// subclasses.
|
|
//
|
|
// The primary reason to have a branching singleton is to centralize management code
|
|
// without being tied explicitly to one interface. The interface can possibly change
|
|
// vastly as it gets passed down the tree to the point where all the original functions
|
|
// are stubs and the interface uses an entirely different set of functions.
|
|
//
|
|
// $NoKeywords: $
|
|
//=============================================================================//
|
|
|
|
#ifndef BRANCHINGSINGLETON_H
|
|
#define BRANCHINGSINGLETON_H
|
|
#ifdef _WIN32
|
|
#pragma once
|
|
#endif
|
|
|
|
|
|
#define START_BRANCHING_SINGLETON_DEFINITION_NOBASE( classname ) class classname
|
|
|
|
#define START_BRANCHING_SINGLETON_DEFINITION( classname ) class classname : public Base##classname
|
|
|
|
#define _END_BRANCHING_SINGLETON_DEFINITION( classname );\
|
|
static classname *Get_##classname##_Static( void )\
|
|
{\
|
|
static classname s_Singleton;\
|
|
return &s_Singleton;\
|
|
}\
|
|
\
|
|
virtual Root##classname *Get_##classname##( void )\
|
|
{\
|
|
return Get_##classname##_Static();\
|
|
}\
|
|
typedef classname Base##classname;
|
|
|
|
#define END_BRANCHING_SINGLETON_DEFINITION( classname ) _END_BRANCHING_SINGLETON_DEFINITION( classname )
|
|
|
|
#define END_BRANCHING_SINGLETON_DEFINITION_NOBASE( classname );\
|
|
typedef classname Root##classname;\
|
|
_END_BRANCHING_SINGLETON_DEFINITION( classname );
|
|
|
|
#endif //#ifndef BRANCHINGSINGLETON_H
|