commit	cceee494ba2ee1dacb5e2b0ac1f7799750f6c2d0	[log] [tgz]
author	Android Build Role Account android-build-prod <android-build-team-robot@google.com>	Thu Mar 11 11:03:13 2021 +0000
committer	Android Build Role Account android-build-prod <android-build-team-robot@google.com>	Thu Mar 11 11:03:13 2021 +0000
tree	8deaebfc1ab9a7bc9d72e464f128e72c9d84e7e2
parent	5e9b5a87aa377b86f0e71849a6fc2dabcfb12414 [diff]
parent	47638648414827185a1f2f059c81cac0d04208c2 [diff]

tree: 8deaebfc1ab9a7bc9d72e464f128e72c9d84e7e2

README.md

itoa

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.

itoa

Performance (lower is better)

Examples

License