This crate provides fast functions for printing floating-point primitives to an
io::Write. 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.
extern crate dtoa;
// write to a vector or other io::Write
let mut buf = Vec::new();
dtoa::write(&mut buf, 2.71828f64)?;
println!("{:?}", buf);
// write to a stack buffer
let mut bytes = [b'\0'; 20];
let n = dtoa::write(&mut bytes[..], 2.71828f64)?;
println!("{:?}", &bytes[..n]);The function signature is:
fn write<W: io::Write, V: dtoa::Floating>(writer: W, value: V) -> io::Result<()>where dtoa::Floating is implemented for f32 and f64. The return value
gives the number of bytes written.
Dtoa is available on crates.io. Use the
following in Cargo.toml:
[dependencies]
dtoa = "0.4"Licensed under either of
- Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in dtoa by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.