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Impl ExactSizeIterator for multi_field_iter.

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Tom Alexander 2023-10-10 15:23:04 -04:00
parent ee5ed17c20
commit b7f7876706
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1 changed files with 7 additions and 0 deletions
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7
src/iter/macros.rs
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@ -79,8 +79,15 @@ $fieldname: $innertype,
.or_else(|| self.$fieldname.next().map(Into::<AstNode>::into))
),*
}
fn size_hint(&self) -> (usize, Option<usize>) {
let size = self.$firstfieldname.len()$( + self.$fieldname.len() ),*;
(size, Some(size))
}
}
impl<'r, 's> ExactSizeIterator for $itertype<'r, 's> {}
impl<'r, 's> IntoIterator for &'r $astnodetype {
type Item = AstNode<'r, 's>;