非const引用绑定到临时，Visual Studio错误？

问题描述

我遇到这个，而编译一些便携式代码在 gcc 。基本上，这个奇怪的代码编译在Visual studio，这真的只是让我的脑海：

I ran into this while compiling some portable code in gcc. Basically this strange code compiles in Visual studio which really just blows my mind:

class Zebra {int x;};
Zebra goo() {Zebra z; return z;}
void foo(Zebra &x)
{
    Zebra y;
    x = y;
    foo(goo());
}

Visual studio 这一个飞。 gcc 会将此捕获为编译错误。有趣的是，如果你输入typedef Zebra to int， VC ++ 会抱怨。相当矛盾的行为。

Visual studio lets this one fly. gcc will catch this as a compile error. Interestingly, If you typedef Zebra to int, VC++ will complain. Quite contradictory behavior. Thoughts?

推荐答案

这是Visual Studio的旧扩展，我在Microsoft网站上找到的唯一参考是这个错误报告： ，其中有以下示例代码：

This is old extension to Visual Studio, the only reference I could find on the Microsoft site was this bug report: Temporary Objects Can be Bound to Non-Const References, which has the following example code:

struct A {};

A     f1();
void f2(A&);

int main()
{
    f2(f1()); // This line SHALL trigger an error, but it can be compiled without any     errors or warnings.
}

其中一个回应说明：

这篇博客文章：，它涵盖了这个扩展，注意到： p>

This blog post: Visual C++ is so Liberal which covers this extension notes that:

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