Rust宏可以创建编译时字符串吗? [英] Can Rust macros create compile-time strings?

问题描述

默认情况下，宏变量在Rust宏中转义.有什么办法可以让他们逃脱吗?

Macro variables are escaped in Rust macros by default. Is there any way to have them not escaped?

macro_rules! some {
    ( $var:expr ) => ( "$var" );
}

some!(1) // returns "$var", not "1"

这对于连接编译时字符串等有用.

This is useful for concatenating compile-time strings and such.

推荐答案

听起来像您要 stringify! :

It sounds like you want stringify!:

macro_rules! some {
    ( $var:expr ) => ( stringify!($var) );
}

fn main() {
    let s = some!(1);
    println!("{}", s);
}

您可能还需要 concat! .

And you will probably want concat! too.

另请参阅:

• 如何在编译时创建静态字符串

这篇关于Rust宏可以创建编译时字符串吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！