C ++中volatile成员函数的目的是什么？ [英] What is the purpose of a volatile member function in C++?

问题描述

C ++中 volatile 成员函数的目的是什么？

What is the purpose of a volatile member function in C++?

推荐答案

要回答关于具有volatile成员函数（这可能是也可能不是发布该问题的人最初想要的）的含义的问题，将成员函数标记为 const 或 volatile （或组合的 const volatile ）将这些限定符应用于 this 在函数中使用的指针。如标准（9.2.1 this 指针）所述：

To answer the question about what it means to have a 'volatile member function' (which may or may not be what was originally intended by the person who posted the question), marking a member function as const or volatile (or a combined const volatile) applies those qualifiers to the this pointer used in the function. As stated by the standard (9.2.1 "The this pointer"):

类X 的成员函数中的类型为 X * 。如果成员函数被声明为 const ，那么类型为 const X * code> volatile ， 的类型为 volatile X * 如果成员函数声明为 const volatile ，则其类型为 const volatile X * 。

The type of this in a member function of a class X is X*. If the member function is declared const, the type of this is const X*, if the member function is declared volatile, the type of this is volatile X*, and if the member function is declared const volatile, the type of this is const volatile X*.

因此，通过将成员函数标记为 volatile ，您可以访问非该成员函数中的对象的静态数据成员为 volatile 。

So by marking the member function as volatile you'd be making any access to the non-static data members of the object within that member function as volatile.

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