可以声明会在Rust中警告未使用结果的函数吗? [英] Possible to declare functions that will warn on unused results in Rust?

问题描述

Rust是否有一种方法来声明一个函数，对于任何类型，如果不使用它的结果都会发出警告?

Does Rust have a way to declare a function, where not using its result will warn - for any types?

类似于GCC的 __ attribute __((warn_unused_result)); 吗?

推荐答案

从1.27开始，#[must_use] 也适用于函数.

As of 1.27, #[must_use] works for functions too.

看来，#[must_use] 属性仅适用于 struct s， enum s和 union s( union 在稳定的Rust中尚不可用):

It appears that the #[must_use] attribute is only applicable to structs, enums and unions (union is not available in stable Rust yet, though): source. I think this means you can't override it for a function.

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