63 lines
1.8 KiB
Markdown
63 lines
1.8 KiB
Markdown
itoa
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====
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[![Build Status](https://api.travis-ci.org/dtolnay/itoa.svg?branch=master)](https://travis-ci.org/dtolnay/itoa)
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[![Latest Version](https://img.shields.io/crates/v/itoa.svg)](https://crates.io/crates/itoa)
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This crate provides fast functions for printing integer primitives to an
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[`io::Write`](https://doc.rust-lang.org/std/io/trait.Write.html). The
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implementation comes straight from
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[libcore](https://github.com/rust-lang/rust/blob/b8214dc6c6fc20d0a660fb5700dca9ebf51ebe89/src/libcore/fmt/num.rs#L201-L254)
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but avoids the performance penalty of going through
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[`fmt::Formatter`](https://doc.rust-lang.org/std/fmt/struct.Formatter.html).
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See also [`dtoa`](https://github.com/dtolnay/dtoa) for printing floating point
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primitives.
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## Performance
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![performance](https://raw.githubusercontent.com/dtolnay/itoa/master/performance.png)
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## Functions
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```rust
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extern crate itoa;
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let mut buf = Vec::new();
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itoa::write(&mut buf, 128u64).unwrap();
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```
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The function signature is:
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```rust
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fn write<W: io::Write + ?Sized, V: itoa::Integer>(writer: &mut W, value: V) -> io::Result<()>
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```
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where `itoa::Integer` is implemented for `i8`, `u8`, `i16`, `u16`, `i32`, `u32`,
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`i64`, `u64`, `isize` and `usize`.
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## Dependency
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Itoa is available on [crates.io](https://crates.io/crates/itoa). Use the
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following in `Cargo.toml`:
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```toml
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[dependencies]
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itoa = "0.2"
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```
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## License
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Licensed under either of
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* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
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at your option.
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### Contribution
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Unless you explicitly state otherwise, any contribution intentionally submitted
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for inclusion in itoa by you, as defined in the Apache-2.0 license, shall be
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dual licensed as above, without any additional terms or conditions.
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