| commit | 184ee55b59613baf4f608115c14d870c3ea65e62 | [log] [tgz] |
|---|---|---|
| author | Android Build Coastguard Worker <[email protected]> | Thu Aug 25 07:53:33 2022 +0000 |
| committer | Android Build Coastguard Worker <[email protected]> | Thu Aug 25 07:53:33 2022 +0000 |
| tree | 3b1504f99e3af24d7ff3099804413156a07ffab5 | |
| parent | a73f0491f1cdd814b665790de604aa23d2242f87 [diff] | |
| parent | baa2bcc59ad653e6bc45f4dfc3f9b77cbdabea2c [diff] |
Snap for 8992082 from baa2bcc59ad653e6bc45f4dfc3f9b77cbdabea2c to gki13-boot-release Change-Id: Iad103e9f6f8d699e86dc6d01d50ad8d8c7ac93a9
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.