Cookbook系列之Cpp：雜項

問題01：如何使用地址來引用數據成員或成員函數

    使用類名和範圍操作符加上星號來正確地引用類成員。

#include <iostream>
#include <string>

using namespace std;

class MyClass {
public:
    MyClass() : ival_(0), sval_("foo") {}
    ~MyClass() {}
    void incr() {++ival_;}
    void decr() {--ival_;}

    string sval_;
    int ival_;
};

int main()
{
    MyClass obj;

    int    MyClass::* mpi = &MyClass::ival_; // Data member pointers
    string MyClass::* mps = &MyClass::sval_;

    void (MyClass::*mpf)(); // A pointer to a memeber function
    mpf = &MyClass::incr;

    cout << obj.*mpi << endl;
    cout << obj.*mps << endl;

    (obj.*mpf)();
    cout << obj.ival_ << endl;

    return 0;
}