commit | f9f6a5235e23178c58df197a834ed4a54c006bc9 | [log] [tgz] |
---|---|---|
author | Jeff Vander Stoep <jeffv@google.com> | Fri Oct 29 12:00:45 2021 +0000 |
committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Fri Oct 29 12:00:45 2021 +0000 |
tree | b00fd7be46bb83f62f7851d8789a7e988c165bba | |
parent | 7e1667f30f4e3cc986ae6addc69931fd7c16ef10 [diff] | |
parent | f7d05c7d87d1bf1c224ce5d779c0e482d12b0ec6 [diff] |
Enable tests am: e0a696b411 am: f7d05c7d87 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/1861194 Change-Id: I6bf32075bb0dea52a18356da7b4504c6be471f60
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.