| commit | 4b0cd3dc44f22fa6cda84c84ec4d58fd1898a94f | [log] [tgz] |
|---|---|---|
| author | Jeff Vander Stoep <[email protected]> | Fri Oct 29 12:47:41 2021 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Fri Oct 29 12:47:41 2021 +0000 |
| tree | b00fd7be46bb83f62f7851d8789a7e988c165bba | |
| parent | 91ca2bf2b03f1c93e25ac6822eee3de256935983 [diff] | |
| parent | 0ffa25b0b060753ac6e415f87bbbffa6d271a497 [diff] |
Enable tests am: e0a696b411 am: f7d05c7d87 am: f9f6a5235e am: e32cb057fe am: 0ffa25b0b0 Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/1861194 Change-Id: I2b36e61ced19f05d46cc43a421c4d83c787cae72
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.