itoa

This crate provides fast functions for printing integer primitives to an io::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.

Performance

performance

Functions

extern crate itoa;

let mut buf = Vec::new();
itoa::write(&mut buf, 128u64).unwrap();

The function signature is:

fn write<W: io::Write + ?Sized, V: itoa::Integer>(writer: &mut W, value: V) -> io::Result<()>

where itoa::Integer is implemented for i8, u8, i16, u16, i32, u32, i64, u64, isize and usize.

Dependency

Itoa is available on crates.io. Use the following in Cargo.toml:

[dependencies]
itoa = "0.2"

License

Licensed under either of

Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution