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81 lines
3.4 KiB
81 lines
3.4 KiB
1 year ago
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dtoa
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====
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[<img alt="github" src="https://img.shields.io/badge/github-dtolnay/dtoa-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/dtoa)
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[<img alt="crates.io" src="https://img.shields.io/crates/v/dtoa.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/dtoa)
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[<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-dtoa-66c2a5?style=for-the-badge&labelColor=555555&logoColor=white&logo=data:image/svg+xml;base64,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" height="20">](https://docs.rs/dtoa)
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[<img alt="build status" src="https://img.shields.io/github/workflow/status/dtolnay/dtoa/CI/master?style=for-the-badge" height="20">](https://github.com/dtolnay/dtoa/actions?query=branch%3Amaster)
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This crate provides fast functions for printing floating-point primitives to an
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[`io::Write`]. The implementation is a straightforward Rust port of [Milo Yip]'s
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C++ implementation [dtoa.h]. The original C++ code of each function is included
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in comments.
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See also [`itoa`] for printing integer primitives.
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*Version requirement: rustc 1.0+*
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[`io::Write`]: https://doc.rust-lang.org/std/io/trait.Write.html
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[Milo Yip]: https://github.com/miloyip
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[dtoa.h]: https://github.com/miloyip/rapidjson/blob/master/include/rapidjson/internal/dtoa.h
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[`itoa`]: https://github.com/dtolnay/itoa
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```toml
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[dependencies]
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dtoa = "0.4"
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```
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<br>
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## Performance (lower is better)
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![performance](https://raw.githubusercontent.com/dtolnay/dtoa/master/performance.png)
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<br>
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## Examples
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```rust
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use std::io;
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fn main() -> io::Result<()> {
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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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dtoa::write(&mut buf, 2.71828f64)?;
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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 = dtoa::write(&mut bytes[..], 2.71828f64)?;
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println!("{:?}", &bytes[..n]);
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Ok(())
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}
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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: dtoa::Floating>(writer: W, value: V) -> io::Result<()>;
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```
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where `dtoa::Floating` is implemented for f32 and f64. The return value gives
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the number of bytes written.
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<br>
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#### License
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<sup>
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Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
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2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
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</sup>
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<br>
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<sub>
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Unless you explicitly state otherwise, any contribution intentionally submitted
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for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
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be dual licensed as above, without any additional terms or conditions.
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</sub>
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