方便的类成员访问接口

对于含有许多数据成员的类， 通常需要提供数据的set和get接口，下面的代码提供了一种set和get的形式，接口比较简洁：

#include <memory>#include <iostream>#include <vector>using namespace std;class Person{public:Person(const string& name, int age) :mName(name), mAge(age) {}const string& name() const {return mName;}string& name() {return mName;}void name(string& name) {mName = name;}int age() const {return mAge;}int age() {return mAge;}void age(int age) {mAge = age;}private:string mName;int mAge;};int main() {cout << "at first:"<< endl;Person p1("zhangsan", 26);Person p2("lisi", 19);cout << p1.name() << " " << p1.age() << endl;cout << p2.name() << " " << p2.age() << endl;cout << "3 years passed:"<< endl;p1.age(p1.age()+3);p2.age(p2.age()+3);cout << p1.name() << " " << p1.age() << endl;cout << p2.name() << " " << p2.age() << endl;return 0;}