# Macro std::writeln

1.0.0 · source ·

    macro_rules! writeln {
        ($dst:expr $(,)?) => { ... };
        ($dst:expr, $($arg:tt)*) => { ... };
    }

Expand description

Write 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, see `std::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(())
    }

Run