commit	3451b1e7eed5ae18ddeed89e57c60088bfef882b	[log] [tgz]
author	android-build-team Robot <android-build-team-robot@google.com>	Wed Feb 17 03:16:40 2021 +0000
committer	android-build-team Robot <android-build-team-robot@google.com>	Wed Feb 17 03:16:40 2021 +0000
tree	8deaebfc1ab9a7bc9d72e464f128e72c9d84e7e2
parent	da5e04f624b0aa36bdd34b6d52f9efc9c78f61b2 [diff]
parent	473425035cd99f329e159c3bc77f286725f0e0ce [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