| commit | 62d304de31340ea3766799f8c37fe40c8dfbc24d | [log] [tgz] |
|---|---|---|
| author | Joel Galenson <[email protected]> | Thu Sep 23 15:12:04 2021 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Thu Sep 23 15:12:04 2021 +0000 |
| tree | 7be04ab17626897820feb54c5e7fb94b26b51a11 | |
| parent | 7988ee64b39685269253e711f7328015ea50eb1e [diff] | |
| parent | 1be7cdaf2bb30e6e804aa5bc50b0e153faa0b8a5 [diff] |
Upgrade rust/crates/itoa to 0.4.8 am: 2aa19112ea am: 16a00554be am: 7e1667f30f am: 1be7cdaf2b Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/1832699 Change-Id: I3a8ac9571a9f73c00986809810362ddedae7abf7
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.