singleton设计模式，c++实现

       singleton设计模式就是实现对象只能new一次

       

#include <iostream>

class base
{
	private:
		base()
		{
			//	std::cout<<"hello world"<<std::endl;
			str = "hello world";
			//	me = NULL;
		}
	public:
		char* str;
	private:
		static base* me;
	public:
		static base* GetInstance()
		{
			if(me == NULL)
			{
				me = new base();

			}
			return me;
		}
		void hello()
		{
			std::cout<<"hello world"<<std::endl;
		}
	public:
		void _delete()
		{
			std::cout<<"bye"<<std::endl;
			delete me;
			me = NULL;
		}
		~base()
		{
			;
		}
};
base* base::me = NULL;
int main()
{
	base* me = base::GetInstance();
	me->hello();
	me->_delete();
	return 0;
}