c++, singleton

0.

1. Implement a singleton class

class MySingleton{

public:

　　static MySingleton*  const p_single;

private:

　　MySingleton(void){cout << "private constructor." << endl;}　　// private constructor

　　MySingleton(const MySingleton&){}　　//private copy-constructor

　　MySingleton& operator=(const MySingleton&){}　　// prevent assignment

};

MySingleton* const MySingleton::p_single = new MySingleton();　　// private constructor will be called once

int main(){

　　return 0;

}

the output will be: ( order matters)

private constructor.