| commit | baa2bcc59ad653e6bc45f4dfc3f9b77cbdabea2c | [log] [tgz] |
|---|---|---|
| author | Treehugger Robot <[email protected]> | Wed Jun 15 21:00:35 2022 +0000 |
| committer | Automerger Merge Worker <[email protected]> | Wed Jun 15 21:00:35 2022 +0000 |
| tree | 3b1504f99e3af24d7ff3099804413156a07ffab5 | |
| parent | 86f1fa765b84ec0760ceb03b607ab9f68803ef9b [diff] | |
| parent | e26ba2fe8e02dee2e08319238a892a232409685c [diff] |
Merge "Update TEST_MAPPING" am: bd5dbc0e31 am: e26ba2fe8e Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/2124615 Change-Id: I691d0263c4567fa89a49ee19e77bae7f4f9d94e9 Signed-off-by: Automerger Merge Worker <[email protected]>
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.