2018-08-30 07:18:55 -05:00
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// run-pass
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2018-09-25 16:51:35 -05:00
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#![allow(unused_must_use)]
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#![allow(dead_code)]
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2015-03-22 15:13:15 -05:00
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// pretty-expanded FIXME #23616
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2014-10-02 14:52:06 -05:00
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trait Matcher {
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2015-03-25 19:06:52 -05:00
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fn next_match(&mut self) -> Option<(usize, usize)>;
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2014-10-02 14:52:06 -05:00
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}
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struct CharPredMatcher<'a, 'b> {
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str: &'a str,
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2019-05-28 13:47:21 -05:00
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pred: Box<dyn FnMut(char) -> bool + 'b>,
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2014-10-02 14:52:06 -05:00
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}
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impl<'a, 'b> Matcher for CharPredMatcher<'a, 'b> {
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2015-03-25 19:06:52 -05:00
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fn next_match(&mut self) -> Option<(usize, usize)> {
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2014-10-02 14:52:06 -05:00
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None
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}
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}
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trait IntoMatcher<'a, T> {
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2017-06-24 21:29:10 -05:00
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fn into_matcher(self, _: &'a str) -> T;
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2014-10-02 14:52:06 -05:00
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}
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2015-01-02 16:32:54 -06:00
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impl<'a, 'b, F> IntoMatcher<'a, CharPredMatcher<'a, 'b>> for F where F: FnMut(char) -> bool + 'b {
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2014-10-02 14:52:06 -05:00
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fn into_matcher(self, s: &'a str) -> CharPredMatcher<'a, 'b> {
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CharPredMatcher {
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str: s,
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2015-02-15 02:52:21 -06:00
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pred: Box::new(self),
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2014-10-02 14:52:06 -05:00
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}
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}
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}
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struct MatchIndices<M> {
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matcher: M
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}
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2015-01-02 09:25:54 -06:00
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impl<M: Matcher> Iterator for MatchIndices<M> {
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2015-03-25 19:06:52 -05:00
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type Item = (usize, usize);
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2015-01-02 09:25:54 -06:00
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2015-03-25 19:06:52 -05:00
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fn next(&mut self) -> Option<(usize, usize)> {
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2014-10-02 14:52:06 -05:00
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self.matcher.next_match()
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}
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}
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fn match_indices<'a, M, T: IntoMatcher<'a, M>>(s: &'a str, from: T) -> MatchIndices<M> {
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let string_matcher = from.into_matcher(s);
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MatchIndices { matcher: string_matcher }
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}
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fn main() {
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let s = "abcbdef";
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2015-02-01 11:44:15 -06:00
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match_indices(s, |c: char| c == 'b')
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2015-09-24 10:38:48 -05:00
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.collect::<Vec<_>>();
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2014-10-02 14:52:06 -05:00
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}
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