commit | b4ad162358877cc1d9d9b65d57818f904734d47c | [log] [tgz] |
---|---|---|
author | Bob Badour <bbadour@google.com> | Tue Feb 16 21:06:31 2021 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Tue Feb 16 21:06:31 2021 +0000 |
tree | 8deaebfc1ab9a7bc9d72e464f128e72c9d84e7e2 | |
parent | 1a073f29da23f8b18a8f63d97fa2c4759b47cb5a [diff] | |
parent | b6b7fdb4b8b90e6d42365324d59dc1e1b3ed8577 [diff] |
[LSC] Add LOCAL_LICENSE_KINDS to external/rust/crates/itoa am: b6b7fdb4b8 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/1588734 MUST ONLY BE SUBMITTED BY AUTOMERGER Change-Id: Ic6769b88ed1345db6d9b1dadee9823d471ee2edf
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.