forked from Orchid/orchid
14 lines
402 B
Rust
14 lines
402 B
Rust
use std::iter;
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pub fn replace_first<'a, T, F>(slice: &'a [T], mut f: F) -> Option<impl Iterator<Item = T> + 'a>
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where T: Clone, F: FnMut(&T) -> Option<T> {
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for i in 0..slice.len() {
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if let Some(new) = f(&slice[i]) {
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let subbed_iter = slice[0..i].iter().cloned()
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.chain(iter::once(new))
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.chain(slice[i+1..].iter().cloned());
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return Some(subbed_iter)
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}
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}
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None
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} |