| commit | 3d7279c7b3973433ce44028a3cad8801cc727586 | [log] [tgz] |
|---|---|---|
| author | Joel Galenson <jgalenson@google.com> | Wed Apr 28 22:32:42 2021 +0000 |
| committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Wed Apr 28 22:32:42 2021 +0000 |
| tree | a37d77a527c577f11a2c00f84694c9fd47b5617b | |
| parent | ca848213bc1104d58569b80ec10884f53b82908b [diff] | |
| parent | dcd7fa19f594224dda8ec327473448164332b258 [diff] |
Generate apex_available from c2a instead of a patch am: 4f4e7e28e7 am: 2b7f7e3719 am: 67a59fb873 am: dcd7fa19f5 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/1689105 Change-Id: If4d177e30a8926a4d1edec8bd760b95403058f54
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.