rust-lang/rust
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

core: Stabilize FusedIterator

Browse Source 
FusedIterator is a marker trait that promises that the implementing
iterator continues to return `None` from `.next()` once it has returned
`None` once (and/or `.next_back()`, if implemented).

The effects of FusedIterator are already widely available through
`.fuse()`, but with stable `FusedIterator`, stable Rust users can
implement this trait for their iterators when appropriate.
This commit is contained in:
Ulrik Sverdrup
2018-01-15 19:59:10 +01:00
parent c9b86a9178
commit bc651cac8d
28 changed files with 110 additions and 114 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/libcore/iter/sources.rs
View File

@@ -41,7 +41,7 @@ impl<A: Clone> DoubleEndedIterator for Repeat<A> {
fn next_back(&mut self) -> Option<A> { Some(self.element.clone()) }
}
#[unstable(feature = "fused", issue = "35602")]
#[stable(feature = "fused", since = "1.25.0")]
impl<A: Clone> FusedIterator for Repeat<A> {}
#[unstable(feature = "trusted_len", issue = "37572")]
@@ -259,7 +259,7 @@ impl<T> ExactSizeIterator for Empty<T> {
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<T> TrustedLen for Empty<T> {}
#[unstable(feature = "fused", issue = "35602")]
#[stable(feature = "fused", since = "1.25.0")]
impl<T> FusedIterator for Empty<T> {}
// not #[derive] because that adds a Clone bound on T,
@@ -340,7 +340,7 @@ impl<T> ExactSizeIterator for Once<T> {
#[unstable(feature = "trusted_len", issue = "37572")]
unsafe impl<T> TrustedLen for Once<T> {}
#[unstable(feature = "fused", issue = "35602")]
#[stable(feature = "fused", since = "1.25.0")]
impl<T> FusedIterator for Once<T> {}
/// Creates an iterator that yields an element exactly once.