默认情况下,宏变量在Rust宏中转义.有没有办法不让他们逃跑?
macro_rules! some {
( $var:expr ) => ( "$var" );
}
some!(1) // returns "$var", not "1"
这对于连接编译时字符串等非常有用.
默认情况下,宏变量在Rust宏中转义.有没有办法不让他们逃跑?
macro_rules! some {
( $var:expr ) => ( "$var" );
}
some!(1) // returns "$var", not "1"
这对于连接编译时字符串等非常有用.
听起来你想要stringify!
:
macro_rules! some {
( $var:expr ) => ( stringify!($var) );
}
fn main() {
let s = some!(1);
println!("{}", s);
}
你可能也想要concat!
个.
另见: