| commit | 0e7fa2b872acfb15f460a69b86de05a7dcd77539 | [log] [tgz] |
|---|---|---|
| author | Xin Li <[email protected]> | Sat Feb 20 15:37:24 2021 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Sat Feb 20 15:37:24 2021 +0000 |
| tree | 8deaebfc1ab9a7bc9d72e464f128e72c9d84e7e2 | |
| parent | 473425035cd99f329e159c3bc77f286725f0e0ce [diff] | |
| parent | 0a5425495ce0c4fde59dc2dc3ee4f7a13ae86507 [diff] |
[automerger skipped] Mark ab/7061308 as merged in stage. am: 1b4c50fd89 -s ours am: 0a5425495c -s ours am skip reason: Change-Id Ifa41cf173d0d5517dcb3ee794d27581200e85f58 with SHA-1 c31a8529d4 is in history Original change: undetermined MUST ONLY BE SUBMITTED BY AUTOMERGER Change-Id: I8247f6a48863683ed7d4c27eb23b9850bd0a99d2
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.