C++ 重载运算符++

class A{
    friend ostream& operator<<(ostream& out, A* p);
private:
    int a;
    char* b;
    static A* singleA;
private:
    A(int a, char* b){
        this->a = a;
        this->b = new char[10];
        strcpy(this->b, b);
    }
    ~A(){
        delete this->b;
        this->b = NULL;
    }
public:
    static A* getsingleA(){
        return singleA;
    }
    A* operator++(){
        a++;
        return this;
    }
};
A* A::singleA = new A(10, "abc");
ostream& operator<<(ostream& out, A* p){
    out<a<<" "<b< 
输出结果为
 
 
 原因：由于采用单例模式，使用类的指针来进行类的操作，对于第三个输出，是因为++p并没有对类对象进行++，而是对类对象的指针进行了++