| commit | 86f1fa765b84ec0760ceb03b607ab9f68803ef9b | [log] [tgz] |
|---|---|---|
| author | Matthew Maurer <[email protected]> | Tue May 31 16:45:50 2022 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Tue May 31 16:45:50 2022 +0000 |
| tree | 9a61038c9c931891b491a5e2a83dc3e699011343 | |
| parent | a3c757545f3449a212d1f23b39a87b8e04d88360 [diff] | |
| parent | fce29b14a50baf341e71e9eb7e0139ed0b2f1089 [diff] |
Update TEST_MAPPING am: 49b643dc66 am: fce29b14a5 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/2108548 Change-Id: If9d9886a3cfbaaff901a308951bc64435f51b0bb Signed-off-by: Automerger Merge Worker <[email protected]>
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.