单子类模型

Posted 2021-02-22

Note: This doesn't work in multi-threaded environments, check http://en.wikipedia.org/wiki/Singleton_pattern#C.2B.2B

Singleton class model
then:
SingletonClass *pSC = SingletonClass::get_singleton_instance();
pSC->any_public_function();
or: SingletonClass::get_singleton_instance()->any_public_function();

at the end of the program don't forget: SingletonClass::destroy();

//.h
class SingletonClass {
 
	static SingletonClass *singleton;
	SingletonClass();
 
public:
	static SingletonClass * get_singleton_instance();
	static void destroy();
	~SingletonClass();
};
 
 
//.cpp
SingletonClass *SingletonClass::singleton = NULL;
 
SingletonClass * SingletonClass::get_singleton() {
	if( singleton == NULL ) singleton = new SingletonClass();
	return singleton;
}
 
void SingletonClass::destroy() {
	if( singleton != NULL ) delete singleton;
	singleton = NULL;
}
 
SingletonClass::SingletonClass() {
	singleton = this;
}
 
SingletonClass::~SingletonClass() {
}