commit | e81a68352af3c55e5431b30683436c10f0f14ed1 | [log] [tgz] |
---|---|---|
author | Haibo Huang <hhb@google.com> | Mon Jan 25 17:34:10 2021 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Mon Jan 25 17:34:10 2021 +0000 |
tree | fcbd51b8adf2d2ed89cee6ccad95ba1a594992eb | |
parent | 3dbf0b5f073376a7afe1ca86646e942390098ae6 [diff] | |
parent | 0bbe365be2928e333b4d76a973b5247e8fcb7445 [diff] |
Upgrade rust/crates/itoa to 0.4.7 am: a4c5ece50b am: 1a073f29da am: 0bbe365be2 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/1534068 MUST ONLY BE SUBMITTED BY AUTOMERGER Change-Id: I30c22b1a5b078135c564ada5fef13805f1a5e700
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.