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45 строки
1.2 KiB
Plaintext
45 строки
1.2 KiB
Plaintext
https://doc.rust-lang.org/std/macro.concat.html
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works for literals only (? statics ?)
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https://crates.io/crates/concat-string
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https://docs.rs/concat-string
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https://github.com/FaultyRAM/concat-string
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https://github.com/FaultyRAM/concat-string/blob/master/src/lib.rs
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...
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macro_rules! concat_string {
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() => { String::with_capacity(0) };
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($($s:expr),+) => {{
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use std::ops::AddAssign;
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let mut len = 0;
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$(len.add_assign(AsRef::<str>::as_ref(&$s).len());)+
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let mut buf = String::with_capacity(len);
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$(buf.push_str($s.as_ref());)+
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buf
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}};
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}
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...
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// The addition assignment operator +=.
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https://doc.rust-lang.org/std/ops/trait.AddAssign.html
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https://github.com/hoodie/concatenation_benchmarks-rs
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...
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#[bench]
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#[cfg(unix)]
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fn from_bytes(b: &mut Bencher) {
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use std::slice;
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use std::ffi::OsStr;
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use std::os::unix::ffi::OsStrExt;
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b.iter(|| {
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let bytes = unsafe { slice::from_raw_parts(DATE.as_ptr(), 20) };
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let datetime = OsStr::from_bytes(bytes);
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test::black_box(datetime);
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});
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}
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2017
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https://www.reddit.com/r/rust/comments/48fmta/seven_ways_to_concatenate_strings_in_rust_the/
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