| Issue |
61426
|
| Summary |
Clang C++20 Feature: P0588R1 - Simplifying implicit lambda capture
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
h-vetinari
|
id: P0588R1
paper: https://wg21.link/P0588R1
This paper doesn't have a tracking issue in the [C++20 project](https://github.com/orgs/llvm/projects/14/views/1) yet[^1]. It also shows up on the cppreference [implementation status page](https://en.cppreference.com/w/cpp/compiler_support), and presumably should be tracked in https://clang.llvm.org/cxx_status.html (like other DRs that have a Pxxxx).
[^1]: It's obviously questionable to call this a "C++20 Feature", but I'm following the pattern of the other paper-tracking issues.
I found some related issues[^2], but none dedicated to this:
* https://github.com/llvm/llvm-project/issues/58872
* https://github.com/llvm/llvm-project/issues/44851
* https://github.com/llvm/llvm-project/issues/37673
* https://github.com/llvm/llvm-project/issues/34771
[^2]: curiously, GH search found nothing for "P0588", but did find something for "P0588R1"
Most recently, @erichkeane wrote in #58872:
> DR status is tracked here : https://clang.llvm.org/cxx_dr_status.html
>
> So it would be tracked there as [CWG1632](https://wg21.link/cwg1632) and [CWG1913](https://wg21.link/cwg1913).
>
> From the looks of it, implementation will likely quickly get into a "thar be dragons" part of the compiler. We need to suppress instantiation of the body of dependent lambdas (the easy part), but getInstantiationArgs likely needs updating for it (which is a function that had some serious problems) to properly handle this and other cases.
This was followed by https://reviews.llvm.org/D138148 (open) & https://reviews.llvm.org/D137244 (merged). In the latter, @cor3ntin notes:
> Either way, I think this makes support for P0588 complete, but we probably want to add a test for that in a separate PR.
> (and I lack confidence I understand P0588 sufficiently to assert the completeness of our conformance).
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