Commit 4a95e97

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Auto merge of #61953 - Centril:shared-from-iter, r=RalfJung

Add `impl<T> FromIterator<T> for Arc/Rc<[T]>` Add implementations of `FromIterator<T> for Arc/Rc<[T]>` with symmetrical logic. This also takes advantage of specialization in the case of iterators with known length (`TrustedLen`) to elide the final allocation/copying from a `Vec<T>` into `Rc<[T]>` because we can allocate the space for the `Rc<[T]>` directly when the size is known. This is the primary motivation and why this is to be preferred over `iter.collect::<Vec<_>>().into(): Rc<[T]>`. Moreover, this PR does some refactoring in some places. r? @RalfJung for the code cc @alexcrichton from T-libs

2 parents a9c7feb + 85def30 commit 4a95e97Copy full SHA for 4a95e97

6 files changed

+652

-140

lines changed

src/liballoc
- lib.rs
- rc.rs
- sync.rs
- tests

6 files changed

+652

-140

lines changed

`‎src/liballoc/lib.rs`

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 #![feature(ptr_offset_from)]
 #![feature(rustc_attrs)]
 #![feature(receiver_trait)]
 +#![feature(slice_from_raw_parts)]
 #![feature(specialization)]
 #![feature(staged_api)]
 #![feature(std_internals)]

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