std::writeln!
[−]
macro_rules! writeln { ( $ dst : expr , $ fmt : expr ) => { ... }; ( $ dst : expr , $ fmt : expr , $ ( $ arg : tt ) * ) => { ... }; }
Use the format!
syntax to write data into a buffer, appending a newline.
This macro is typically used with a buffer of &mut
Write
.
See std::fmt
for more information on format syntax.
Examples
use std::io::Write; let mut w = Vec::new(); writeln!(&mut w, "test").unwrap(); writeln!(&mut w, "formatted {}", "arguments").unwrap(); assert_eq!(&w[..], "test\nformatted arguments\n".as_bytes());