singleton_3.cpp

来自「这是一些c++例程」· C++ 代码 · 共 22 行

namespace DesignPattern_Singleton
{
	template < class T >
		class Singleton
	{
public:
	static T* Instance() { static T _instance ; return &_instance ; }
protected:
	Singleton() {}
private:
	Singleton(const Singleton &) ;
	Singleton& operator=(const Singleton&) ;
	} ;
//从Singleton派生子类ConcreteSingleton
	class ConcreteSingleton : public Singleton< ConcreteSingleton > {} ;
}
void main()
{
	using namespace DesignPattern_Singleton ;
	ConcreteSingleton *p = ConcreteSingleton::Instance() ;
}