writeln in std - Rust (original) (raw)

Macro writeln

1.0.0 · Source

macro_rules! writeln {
    ($dst:expr $(,)?) => { ... };
    ($dst:expr, <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mopen">(</span></span></span></span>arg:tt)*) => { ... };
}

Expand description

Writes formatted data into a buffer, with a newline appended.

On all platforms, the newline is the LINE FEED character (\n/U+000A) alone (no additional CARRIAGE RETURN (\r/U+000D).

For more information, see write!. For information on the format string syntax, seestd::fmt.

§Examples

use std::io::{Write, Result};

fn main() -> Result<()> {
    let mut w = Vec::new();
    writeln!(&mut w)?;
    writeln!(&mut w, "test")?;
    writeln!(&mut w, "formatted {}", "arguments")?;

    assert_eq!(&w[..], "\ntest\nformatted arguments\n".as_bytes());
    Ok(())
}