commit	17a8b6c93d5ebf1c50f92d30a5d2cc56748d8c9b	[log] [tgz]
author	Android Build Role Account android-build-prod <android-build-team-robot@google.com>	Thu Nov 05 11:02:09 2020 +0000
committer	Android Build Role Account android-build-prod <android-build-team-robot@google.com>	Thu Nov 05 11:02:09 2020 +0000
tree	10c0471b78971f94c4027fd815f064d241dd8adf
parent	4ec7f140203d656f985709aa5897b531ae178691 [diff]
parent	0ff2ae5a1dbfd19bb3a1baee24b9701dfd2254d7 [diff]

tree: 10c0471b78971f94c4027fd815f064d241dd8adf

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