format_all_args 0.5.0

format_all_args macro

Formats any number of arguments without heap allocation.

Additionally, the library provides macro optional_arg which may be required when programming macros with optional arguments.

main.rs

use format_all_args::{format_all_args, optional_arg};

fn main() {
    macro_rules! optional_arg_test { ( $($a:expr)? ) => { optional_arg!($($a)?) }; }
    //                                 ----------^                      -----^
    //                                 optional                         optional
    //
    let result = format!("{}", format_all_args!(1,2,3,4,5,optional_arg_test!( ),7));
    assert_eq!(result, "123457");
}