编程参考 - 在C++类成员函数声明中使用const关键字

在 C++ 中，可以在类成员函数声明中使用 const 关键字来表示函数不修改对象的状态。这就是所谓的 "const 成员函数"。将成员函数声明为 const 时，意味着该函数承诺不更改对象的任何成员变量（标记为可变的变量除外）。

In C++, the const keyword can be used in class member function declarations to indicate that the function does not modify the state of the object. This is known as a "const member function." When you declare a member function as const, it means that the function promises not to change any member variables of the object (except those marked as mutable).

Syntax

要将成员函数声明为 const，需要在函数的参数列表后加上 const 关键字：

To declare a member function as const, you place the const keyword after the function's parameter list:

class MyClass {

public:

    void myFunction() const;

};

Benefits of Using const Member Functions

1. 确保对象的完整性： 通过将函数声明为 const，可以确保调用该函数不会修改对象的状态。这有助于保持对象的完整性，尤其是在处理不可变数据时。

1. Ensures Ob