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40 lines
663 B
40 lines
663 B
4 years ago
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//! Utility functions
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use std::{
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borrow::{
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Borrow,
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ToOwned,
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},
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};
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/// Copy slice `src` into `dst` and return the number of elements copied.
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#[inline] pub fn copy_slice<T,U,V,W,X>(mut dst: V, src: W) -> usize
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where V: AsMut<[T]>,
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W: AsRef<[U]>,
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U: ToOwned<Owned=X>,
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X: Borrow<U> + Into<T>
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{
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let mut i=0;
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for (d, s) in dst.as_mut().iter_mut().zip(src.as_ref().iter())
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{
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*d = s.to_owned().into();
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i+=1
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}
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i
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}
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#[cfg(test)]
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mod tests
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{
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#[test]
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fn copy_slice()
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{
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let mut to = [0u8; 40];
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let from = [10u8; 37];
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assert_eq!(super::copy_slice(&mut to, &from), 37);
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assert_eq!(from, &to[0..37]);
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}
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}
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