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
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.