利用宏定义生成getset私有变量函数

利用宏定义生成getset私有变量函数。

宏的本质就是简单的文本替换，而宏里面的##则是拼接字符串 如name##_ 就表示name_

#include <iostream>
using namespace std;

//首先定义get、set变量的宏
#define GETSETVAR(type, name)\
  private: \
    type name##_;\
  public: \
  void set_##name(const type& value) {name##_ = value;}\
  const type& get_##name(){return name##_;}

//定义一个class测试上面定义的宏
class Test
{
public:
  void Print()
  {
    cout<<"name:"<<name_<<"   age :"<<age_<<"   gender :"<<gender_<<endl;
  }
private:
  GETSETVAR(int, age);
  GETSETVAR(string, name);
  GETSETVAR(string, gender);
};

int main()
{
  Test liuqiuyue;
  //liuqiuyue.name_="刘秋月"; //私有变量不能访问
  liuqiuyue.set_name("刘秋月");
  liuqiuyue.set_age(18);
  liuqiuyue.set_gender("女");

  liuqiuyue.Print();
  cout<<"name:"<<liuqiuyue.get_name()<<"   age :"<<liuqiuyue.get_age()<<"   gender :"<<liuqiuyue.get_gender()<<endl;

  return 0;
}

结果：

name:刘秋月   age :18   gender :女

name:刘秋月   age :18   gender :女