单例 懒汉式

#include <stdio.h>

class Single

{

public:

    Single operator=(const Single o) = delete;

    static Single* GetInstance() {

        return &obj;

    }

    int value;  

private:

    Single() {}

    Single(Single &&o) {}

    Single(Single &o) {}

    ~Single() {}

    static Single obj;

};

Single Single::obj;

int main()

{

    Single::GetInstance()->value = 1000;

    printf("value %d\n", Single::GetInstance()->value);

    return 0;

}