相关疑难解决方法(0)

假设我们有这个类:

class X {
public:
    explicit X (char* c) { cout<<"ctor"<<endl; init(c); };
    X (X& lv)  { cout<<"copy"<<endl;  init(lv.c_); };
    X (X&& rv) { cout<<"move"<<endl;  c_ = rv.c_; rv.c_ = nullptr; };

    const char* c() { return c_; };

private:
    void init(char *c) { c_ = new char[strlen(c)+1]; strcpy(c_, c); };
    char* c_;

};

以及此示例用法:

X x("test");
cout << x.c() << endl;
X y(x);
cout << y.c() << endl;
X z( X("test") );
cout << z.c() << endl;

输出是:

ctor …