lambdas需要捕获“this”来调用静态成员函数? [英] lambdas require capturing 'this' to call static member function?

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问题描述

对于以下代码:

struct B
{
    void g()
    {
        []() { B::f(); }();
    }

    static void f();
};

g ++ 4.6显示错误:

g++ 4.6 gives the error:


test.cpp:在lambda函数中:

test.cpp:44:21:错误:未对此lambda函数捕获this

test.cpp: In lambda function:
test.cpp:44:21: error: 'this' was not captured for this lambda function

(有趣的是,g ++ 4.5编译代码很好)。

(Interestingly, g++ 4.5 compiles the code fine).

这是g ++ 4.6中的一个错误,是真的有必要捕获this参数,以便能够调用静态成员函数?我不明白为什么它应该是,我甚至合格的调用 B ::

Is this a bug in g++ 4.6, or is it really necessary to capture the 'this' parameter to be able to call a static member function? I don't see why it should be, I even qualified the call with B::.

推荐答案

我同意,应该编译只是罚款。对于修复(如果你不知道已经),只需添加参考捕获,它将编译罚款gcc 4.6

I agree, it should compile just fine. For the fix (if you didn't know already), just add the reference capture and it will compile fine on gcc 4.6

struct B
{
    void g()
    {
        [&]() { B::f(); }();
    }

    static void f() { std::cout << "Hello World" << std::endl; };
};

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