| commit | bee99a307994bcfd7f1ce129e3231b970099e372 | [log] [tgz] |
|---|---|---|
| author | android-build-team Robot <[email protected]> | Tue Feb 23 02:04:55 2021 +0000 |
| committer | android-build-team Robot <[email protected]> | Tue Feb 23 02:04:55 2021 +0000 |
| tree | de0cbf8187347d699e8fbb7291d2749ff1a4b336 | |
| parent | 02a85574d50246ed5d0498b0a19bd1957d2304cb [diff] | |
| parent | 11755b3b32a01f165cec0921f34202e133f86bbe [diff] |
Snap for 7163567 from 11755b3b32a01f165cec0921f34202e133f86bbe to sc-d1-release Change-Id: I4d21c3d142eddfe36b3377bd81b871f559178e08
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.