Stuart Cook
324bf2b9fd
Add Ref/RefMut try_map method Tracking issue: rust-lang/rust#143801 A more generalized version of [`filter_map`](https://doc.rust-lang.org/stable/core/cell/struct.Ref.html#method.filter_map), which allows to return some data on failure. ## Safety As far as I can tell, `E` cannot contain any `'b` data, so it is impossible to duplicate the `&'b [mut]` reference into the `RefCell`'s data. Other than this `E`, everything is analogous to the already stable `filter_map`. ## `Try` / `Residual` I have considered generalizing this to use the `Try` & `Residual` just like rust-lang/rust#79711 does for `array::try_map`, but it does not seem to be possible: we want to essentially `.map_err(|e| (orig, e))` but this does not seem to be supported with `Try`. (Plus I am not even sure if it is possible to express the fact that `&U` in `Try::Output` would have to have the same lifetime as the `&T` input of `F`.) ## ACP ~As far as I can tell, this [is not mandatory](https://std-dev-guide.rust-lang.org/development/feature-lifecycle.html#suitability-for-the-standard-library), and the implementation is small enough to probably be smaller than the doc I would have to write.~ ~https://github.com/rust-lang/libs-team/issues/341~ https://github.com/rust-lang/libs-team/issues/586
This is the main source code repository for Rust. It contains the compiler, standard library, and documentation.
Why Rust?
-
Performance: Fast and memory-efficient, suitable for critical services, embedded devices, and easily integrated with other languages.
-
Reliability: Our rich type system and ownership model ensure memory and thread safety, reducing bugs at compile-time.
-
Productivity: Comprehensive documentation, a compiler committed to providing great diagnostics, and advanced tooling including package manager and build tool (Cargo), auto-formatter (rustfmt), linter (Clippy) and editor support (rust-analyzer).
Quick Start
Read "Installation" from The Book.
Installing from Source
If you really want to install from source (though this is not recommended), see INSTALL.md.
Getting Help
See https://www.rust-lang.org/community for a list of chat platforms and forums.
Contributing
See CONTRIBUTING.md.
License
Rust is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.
See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.
Trademark
The Rust Foundation owns and protects the Rust and Cargo trademarks and logos (the "Rust Trademarks").
If you want to use these names or brands, please read the Rust language trademark policy.
Third-party logos may be subject to third-party copyrights and trademarks. See Licenses for details.