为什么数据成员不能在Lambda捕获列表中 [英] Why can't a data member be in a lambda capture list

问题描述

我有一个 foo 类，该类具有 bar 作为成员变量。

I have a class foo that has bar as a member variable.

在该类的另一个成员函数中，我正在编写一个lambda函数：

In another member function of the class, I'm writing a lambda function:

[bar](void){}

但是我不能包含 bar 在捕获列表中。为什么会这样呢？

But I can't include bar in the capture list. Why is that?

推荐答案

您可以通过在其中说 this 捕获列表。这与成员是 const 无关。

You capture class members by saying this in the capture list. This has nothing to do with the fact that the member is const.

示例：

#include <iostream>

struct Foo
{
    const int a = 0;
    int b;
    Foo() : b{42} {
        auto f = [this]() { std::cout << a << " " << b << std::endl; };
//                ^^^^ 
        f();
    }
};

int main() {
    Foo x;
}

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