#printing #integer #libcore #itoa

itoa

Fast functions for printing integer primitives to an io::Write

14 releases

0.4.4 May 2, 2019
0.4.3 Sep 8, 2018
0.4.2 Jul 5, 2018
0.4.1 Mar 22, 2018
0.1.1 Jun 25, 2016

#1 in Value formatting

Download history 125404/week @ 2019-06-01 122157/week @ 2019-06-08 116776/week @ 2019-06-15 118594/week @ 2019-06-22 106701/week @ 2019-06-29 109319/week @ 2019-07-06 114504/week @ 2019-07-13 115802/week @ 2019-07-20 121014/week @ 2019-07-27 126189/week @ 2019-08-03 128932/week @ 2019-08-10 123160/week @ 2019-08-17 121283/week @ 2019-08-24 122599/week @ 2019-08-31 128789/week @ 2019-09-07

438,441 downloads per month
Used in 6,907 crates (38 directly)

MIT/Apache

18KB
238 lines

itoa

Build Status Latest Version Rust Documentation

This crate provides fast functions for printing integer primitives to an io::Write or a fmt::Write. The implementation comes straight from libcore but avoids the performance penalty of going through fmt::Formatter.

See also dtoa for printing floating point primitives.

Version requirement: rustc 1.0+

[dependencies]
itoa = "0.4"

Performance (lower is better)

performance


Examples

use std::{fmt, io};

fn demo_itoa_write() -> io::Result<()> {
    // Write to a vector or other io::Write.
    let mut buf = Vec::new();
    itoa::write(&mut buf, 128u64)?;
    println!("{:?}", buf);

    // Write to a stack buffer.
    let mut bytes = [0u8; 20];
    let n = itoa::write(&mut bytes[..], 128u64)?;
    println!("{:?}", &bytes[..n]);

    Ok(())
}

fn demo_itoa_fmt() -> fmt::Result {
    // Write to a string.
    let mut s = String::new();
    itoa::fmt(&mut s, 128u64)?;
    println!("{}", s);

    Ok(())
}

The function signatures are:

fn write<W: io::Write, V: itoa::Integer>(writer: W, value: V) -> io::Result<usize>;

fn fmt<W: fmt::Write, V: itoa::Integer>(writer: W, value: V) -> fmt::Result;

where itoa::Integer is implemented for i8, u8, i16, u16, i32, u32, i64, u64, i128, u128, isize and usize. 128-bit integer support requires rustc 1.26+ and the i128 feature of this crate enabled.

The write function is only available when the std feature is enabled (default is enabled). The return value gives the number of bytes written.


License

Licensed under either of Apache License, Version 2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

No runtime deps