rust-lang / rust-lang/rfcs

Allocator adaptors for building strings and vectors with shared ownership.

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Description

Assuming allocator support, and P<T, A=Heap> where P<T> is one of Box<T>, Rc<T>, Vec<T>, String, etc.:
There could be an AsRc<A=Heap> allocator adaptor, which leaves space for a refcount when allocating and resizing an allocation.

We can then build a String<AsRc>, convert it to Box<str, AsRc> and convert that to Rc<str>, without any redundant copies.

This might also make an interesting alternative to polymorphic box: Rc::from(box foo) would work even if box expr: Box<T, A> (but it is even more verbose than Rc::new).

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Research direction

No files, tests, or entry points are named. Start by researching Rust allocator support and the proposed AsRc adaptor, including the String, Box, and Rc conversions described here. Done would require a concrete RFC with a settled API, ownership behavior, and acceptance criteria.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
compilers
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
20/100

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