std::write!
[−]
macro_rules! write { ( $ dst : expr , $ ( $ arg : tt ) * ) => { ... }; }
Write formatted data into a buffer
This macro accepts any value with write_fmt
method as a writer, a format string, and a list
of arguments to format.
write_fmt
method usually comes from an implementation of std::fmt::Write
or
std::io::Write
traits. These are sometimes called 'writers'.
Passed arguments will be formatted according to the specified format string and the resulting string will be passed to the writer.
See std::fmt
for more information on format syntax.
Return value is completely dependent on the 'write_fmt' method.
Common return values are: Result
, io::Result
Examples
fn main() { use std::io::Write; let mut w = Vec::new(); write!(&mut w, "test").unwrap(); write!(&mut w, "formatted {}", "arguments").unwrap(); assert_eq!(w, b"testformatted arguments"); }use std::io::Write; let mut w = Vec::new(); write!(&mut w, "test").unwrap(); write!(&mut w, "formatted {}", "arguments").unwrap(); assert_eq!(w, b"testformatted arguments");