tag | b86322186faf8b256bf02e9f2c501a88c604d0b6 | |
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tagger | The Android Open Source Project <initial-contribution@android.com> | Wed Sep 04 16:22:47 2024 -0700 |
object | 52806fb8b0331215842ccee4e8646d4cb99048fa |
Android platform 12.1.0 release 31
commit | 52806fb8b0331215842ccee4e8646d4cb99048fa | [log] [tgz] |
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author | android-build-team Robot <android-build-team-robot@google.com> | Sat May 15 03:06:15 2021 +0000 |
committer | android-build-team Robot <android-build-team-robot@google.com> | Sat May 15 03:06:15 2021 +0000 |
tree | a37d77a527c577f11a2c00f84694c9fd47b5617b | |
parent | 6d2b94e82dd40aef9a0ffce78780effc5b3a6d3c [diff] | |
parent | e3646b0bc6de05be77864f13b9e587a465a06be3 [diff] |
Snap for 7362794 from e3646b0bc6de05be77864f13b9e587a465a06be3 to sc-v2-release Change-Id: Ia0dbafd705da8b88b9ea30ea2bde2714ad74e962
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.