| commit | 11755b3b32a01f165cec0921f34202e133f86bbe | [log] [tgz] |
|---|---|---|
| author | Treehugger Robot <[email protected]> | Mon Feb 22 19:59:29 2021 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Mon Feb 22 19:59:29 2021 +0000 |
| tree | de0cbf8187347d699e8fbb7291d2749ff1a4b336 | |
| parent | 0e7fa2b872acfb15f460a69b86de05a7dcd77539 [diff] | |
| parent | 3a236d1201d48d41df15cb2018a7aa83d59f4481 [diff] |
Merge "Add virtmanager to the virt APEX" am: 3a1f11ebd3 am: 58433b6537 am: 3a236d1201 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/1589314 MUST ONLY BE SUBMITTED BY AUTOMERGER Change-Id: I2748709e5ac2f9a741a8470239b2703971470e90
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.