71 lines
2.1 KiB
Markdown
71 lines
2.1 KiB
Markdown
itoa
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====
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[](https://travis-ci.org/dtolnay/itoa)
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[](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 (lower is better)
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## Functions
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```rust
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extern crate itoa;
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// write to a vector or other io::Write
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let mut buf = Vec::new();
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itoa::write(&mut buf, 128u64)?;
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println!("{:?}", buf);
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// write to a stack buffer
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let mut bytes = [b'\0'; 20];
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let n = itoa::write(&mut bytes[..], 128u64)?;
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println!("{:?}", &bytes[..n]);
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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, V: itoa::Integer>(writer: W, value: V) -> io::Result<usize>
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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`. The return value gives the number of bytes
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written.
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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 = "0.3"
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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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