co_await表达式中的c ++协程临时

问题描述

限时删除！！

我想知道如何将协程与通过引用捕获的临时协同等待是否有效.那么以下代码是否有效，我想编译器应该将临时变量和局部变量一样放在协程框架中:

I'm wondering whether co_awaiting a coroutine with a temporary captured by reference is valid or not. So is the following code valid, I guess should the compiler put the temporary in the coroutine frame as for local variables:

task g(const S&);

task f() {
    co_await g(S{});
}

在clang和msvc( https://godbolt.org/z/HqHae8 )上，恢复g之后，无论在gcc上，临时文件似乎都被破坏了( https://godbolt.org/z/hFWvU-)似乎在临时挂起后临时文件被销毁了.

On clang and msvc (https://godbolt.org/z/HqHae8), the temporary seems to be detroyed after g is resumed, whether on gcc (https://godbolt.org/z/hFWvU-) it seems that the temporary is destroyed after initial suspend.

推荐答案

MSVC和Clang正确，临时表达式在完整表达式的末尾被销毁.

MSVC and Clang are right, temporaries are destroyed at the end of the full-expression.

对于GCC，这是错误 95599 .显然，此错误正在修复中.

For GCC, this is bug 95599. Apparently this bug is in the process of being fixed.

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