https://github.com/dtolnay/itoa
Fast function for printing integer primitives to a decimal string
https://github.com/dtolnay/itoa
performance rust
Last synced: 3 months ago
JSON representation
Fast function for printing integer primitives to a decimal string
- Host: GitHub
- URL: https://github.com/dtolnay/itoa
- Owner: dtolnay
- License: apache-2.0
- Created: 2016-06-25T21:33:07.000Z (almost 10 years ago)
- Default Branch: master
- Last Pushed: 2025-03-03T23:42:53.000Z (over 1 year ago)
- Last Synced: 2025-05-08T00:04:48.188Z (about 1 year ago)
- Topics: performance, rust
- Language: Rust
- Homepage:
- Size: 522 KB
- Stars: 325
- Watchers: 5
- Forks: 39
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE-APACHE
Awesome Lists containing this project
README
itoa
====
[
](https://github.com/dtolnay/itoa)
[
](https://crates.io/crates/itoa)
[
](https://docs.rs/itoa)
[
](https://github.com/dtolnay/itoa/actions?query=branch%3Amaster)
This crate provides a fast conversion of integer primitives to decimal strings.
The implementation comes straight from [libcore] but avoids the performance
penalty of going through [`core::fmt::Formatter`].
See also [`zmij`] for printing floating point primitives.
[libcore]: https://github.com/rust-lang/rust/blob/1.92.0/library/core/src/fmt/num.rs#L190-L253
[`core::fmt::Formatter`]: https://doc.rust-lang.org/std/fmt/struct.Formatter.html
[`zmij`]: https://github.com/dtolnay/zmij
```toml
[dependencies]
itoa = "1.0"
```
## Example
```rust
fn main() {
let mut buffer = itoa::Buffer::new();
let printed = buffer.format(128u64);
assert_eq!(printed, "128");
}
```
## Performance
The [itoa-benchmark] compares this library and other Rust integer formatting
implementations across a range of integer sizes. The vertical axis in this chart
shows nanoseconds taken by a single execution of
`itoa::Buffer::new().format(value)` so a lower result indicates a faster
library.
[itoa-benchmark]: https://github.com/dtolnay/itoa-benchmark
#### License
Licensed under either of Apache License, Version
2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.