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Make InstantiatedPredicates impl IntoIterator

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This commit is contained in:
Michael Goulet 2023-01-03 03:32:59 +00:00
parent 91fd862df0
commit 9b28edb6d7
12 changed files with 74 additions and 65 deletions
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27
compiler/rustc_middle/src/ty/mod.rs
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@ -1252,6 +1252,33 @@ impl<'tcx> InstantiatedPredicates<'tcx> {
pub fn is_empty(&self) -> bool {
self.predicates.is_empty()
}
pub fn iter(&self) -> <&Self as IntoIterator>::IntoIter {
(&self).into_iter()
}
}
impl<'tcx> IntoIterator for InstantiatedPredicates<'tcx> {
type Item = (Predicate<'tcx>, Span);
type IntoIter = std::iter::Zip<std::vec::IntoIter<Predicate<'tcx>>, std::vec::IntoIter<Span>>;
fn into_iter(self) -> Self::IntoIter {
std::iter::zip(self.predicates, self.spans)
}
}
impl<'a, 'tcx> IntoIterator for &'a InstantiatedPredicates<'tcx> {
type Item = (Predicate<'tcx>, Span);
type IntoIter = std::iter::Zip<
std::iter::Copied<std::slice::Iter<'a, Predicate<'tcx>>>,
std::iter::Copied<std::slice::Iter<'a, Span>>,
>;
fn into_iter(self) -> Self::IntoIter {
std::iter::zip(self.predicates.iter().copied(), self.spans.iter().copied())
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash, HashStable, TyEncodable, TyDecodable, Lift)]