如果我将变量重新定义为auto，并且推导的类型相同，它的格式是否正确? [英] Is it well-formed, if I redefine a variable as auto, and the deduced type is the same?

问题描述

看看这个片段:

int a;
extern int b;
auto b = a;

格式是否正确? Clang成功地编译了它，但是GCC和MSVC没有.

Is it well-formed? Clang successfully compiles it, but GCC and MSVC don't.

(当我回答推荐答案

Tl; DR;

clang是正确的，逻辑是[dcl.spec.auto]允许这样做，并将其限制为推导的返回类型

Tl;DR;

clang is correct, the logic is that this is allowed by [dcl.spec.auto] and to restrict this for deduced return types [dcl.spec.auto]p11 was added otherwise there is no restriction and therefore this is not restricted for the variables case.

请参阅我的重复中更完整的答案

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