Macro concat_string

macro_rules! concat_string {
    () => { ... };
    ($($s:expr),+) => { ... };
}

Concatenates a series of string slices into an owned string.

This macro accepts zero or more arguments, where each argument implements AsRef<str>, and efficiently combines their string representations into a String in order of declaration.

This is mainly useful for cases where the cost of parsing a format string outweighs the cost of converting its arguments. Because concat_string avoids format strings entirely, it can achieve a higher level of performance than using format! or other formatting utilities that return a String.

Example

#[macro_use(concat_string)]
extern crate concat_string;

fn main() {
    println!("{}", concat_string!("Hello", String::from(" "), "world"));
}