| commit | 262d642d678abb54f4b4c4164d8c01e56a46f8b7 | [log] [tgz] |
|---|---|---|
| author | Yi Kong <yikong@google.com> | Tue Sep 01 03:23:29 2020 +0000 |
| committer | Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com> | Tue Sep 01 03:23:29 2020 +0000 |
| tree | d9b0fa6e8495b377dba489f40030156dd22347dc | |
| parent | fdcd4948cf0f4dcf61cf26322684b1569c38739c [diff] | |
| parent | ac1a7b3d82a0f7b7e96c7f1da20768768a6bfbf7 [diff] |
Import 'itoa' crate version 0.4.6 am: 8884bbeb9c am: aa38c62a6a am: ac1a7b3d82 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/1414792 Change-Id: I97c2e462903f73daf66bee4199e801bf9a1098b6
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.