CPlusPlusThings/modern_C++_30/memorymodel_atomic/hungrysingleton.cpp

//
// Created by light on 20-2-6.
//

class singleton {
private:
    singleton() {}
    static singleton *p;
public:
    static singleton *instance();
};

singleton *singleton::p = new singleton();
singleton* singleton::instance() {
    return p;
}