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dtoa

★ 138 Open GitHub ↗

Fast functions for printing floating-point primitives to a decimal string

// repository documentation

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dtoa
====

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This crate provides fast conversion of floating point primitives to decimal
strings. The implementation is a straightforward Rust port of [Milo Yip]'s C++
implementation [dtoa.h]. The original C++ code of each function is included in
comments.

See also [`itoa`] for printing integer primitives.

[Milo Yip]: https://github.com/miloyip
[dtoa.h]: https://github.com/miloyip/rapidjson/blob/master/include/rapidjson/internal/dtoa.h
[`itoa`]: https://github.com/dtolnay/itoa

```toml
[dependencies]
dtoa = "1.0"
```

## Example

```rust
fn main() {
    let mut buffer = dtoa::Buffer::new();
    let printed = buffer.format(2.71828f64);
    assert_eq!(printed, "2.71828");
}
```

## Performance

The [dtoa-benchmark] compares this library and other Rust floating point
formatting implementations across a range of precisions. The vertical axis in
this chart shows nanoseconds taken by a single execution of
`dtoa::Buffer::new().format_finite(value)` so a lower result indicates a faster
library.

[dtoa-benchmark]: https://github.com/dtolnay/dtoa-benchmark

![performance](https://raw.githubusercontent.com/dtolnay/dtoa/master/dtoa-benchmark.png)

#### License

Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> 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.

dtoa

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