量化交易之C++篇 - const 修饰成员函数（常函数）

#include <iostream>

using namespace std;

class Person {

public:
  Person(int a, int b) {
    this->a = a;
    this->b = b;
  }

  void showInfo() const { // 常函数
    //this->a++; 报错: 因为没有被mutable 修饰；
    cout << "this->a: " << this->a << endl;

    this->b++;
    cout << "this->b: " << this->b << endl;
  }

  int a;
  mutable int b; // 在常函数中, 修改指针指向的这个值;
};


void test01() {
  Person person(10, 20);

  person.showInfo();
}

int main() {

  test01();

  return EXIT_SUCCESS;
}