Macro fmty::fmt_args

macro_rules! fmt_args {
    ($($tt:tt)+) => { ... };
}

Like core::format_args!, but with full ownership.

Examples

use std::fmt::Display;

fn format(a: String, b: String) -> impl Display {
    fmty::format_args!("{a} + {b}")
}

let value = format(1.to_string(), 2.to_string());
assert_eq!(value.to_string(), "1 + 2");

Like core::format_args!, the result implements Debug.

let value = fmty::format_args!("{a} + {b}");
let debug = format!("{:?}", value);
assert_eq!(debug, "1 + 2");

This macro is also aliased as fmt_args for optional brevity.

fmty::fmt_args!("{a} + {b}")

Limitations

Because of how this macro is implemented, nested invocations cannot be implicitly owned.

let s: String = "hola".to_owned();

let value = fmt_args!("{}", fmt_args!("{}", s));

To work around this, the inner value must be explicitly binded:

let inner = fmty::format_args!("{}", s);
let value = fmty::format_args!("{}", inner);