commit | 91ca2bf2b03f1c93e25ac6822eee3de256935983 | [log] [tgz] |
---|---|---|
author | Joel Galenson <jgalenson@google.com> | Thu Sep 23 15:25:05 2021 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Thu Sep 23 15:25:05 2021 +0000 |
tree | 7be04ab17626897820feb54c5e7fb94b26b51a11 | |
parent | 3f4337fe1a0051919cc9ed3057e82065bfb5245e [diff] | |
parent | 62d304de31340ea3766799f8c37fe40c8dfbc24d [diff] |
Upgrade rust/crates/itoa to 0.4.8 am: 2aa19112ea am: 16a00554be am: 7e1667f30f am: 1be7cdaf2b am: 62d304de31 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/1832699 Change-Id: I47a5b5b7db5659f1dad17cb3159622877a760b79
This crate provides fast functions for printing integer primitives to an io::Write
or a fmt::Write
. The implementation comes straight from libcore but avoids the performance penalty of going through fmt::Formatter
.
See also dtoa
for printing floating point primitives.
Version requirement: rustc 1.0+
[dependencies] itoa = "0.4"
use std::{fmt, io}; fn demo_itoa_write() -> io::Result<()> { // Write to a vector or other io::Write. let mut buf = Vec::new(); itoa::write(&mut buf, 128u64)?; println!("{:?}", buf); // Write to a stack buffer. let mut bytes = [0u8; 20]; let n = itoa::write(&mut bytes[..], 128u64)?; println!("{:?}", &bytes[..n]); Ok(()) } fn demo_itoa_fmt() -> fmt::Result { // Write to a string. let mut s = String::new(); itoa::fmt(&mut s, 128u64)?; println!("{}", s); Ok(()) }
The function signatures are:
fn write<W: io::Write, V: itoa::Integer>(writer: W, value: V) -> io::Result<usize>; fn fmt<W: fmt::Write, V: itoa::Integer>(writer: W, value: V) -> fmt::Result;
where itoa::Integer
is implemented for i8, u8, i16, u16, i32, u32, i64, u64, i128, u128, isize and usize. 128-bit integer support requires rustc 1.26+ and the i128
feature of this crate enabled.
The write
function is only available when the std
feature is enabled (default is enabled). The return value gives the number of bytes written.