Bug 262678 – NativePromise can't take callbacks defined with `auto`

• Component: Web Template Framework
• Status: RESOLVED FIXED

[Jean-Yves Avenard [:jya]]

NativePromise template's to determine the type traits of the resolve/reject/settle methods are unable to deal with a lambda using `auto` for the type.

It causes a rather confusing, very long error message.

so you can't write something like:

using MyPromise = NativePromise<int, String>;
MyPromise::createAndSettle(workqueue, [] (auto&& result) {
});

you need to write:
MyPromise::createAndSettle(workqueue, [] (MyPromise::Result&& result) {
});

While it could be argued the latter is more readable and less prone to confusion, using `auto` everywhere is a rather popular trend within the WebKit team. So we should be able to deal with that if possible.

[Radar WebKit Bug Importer]

<rdar://problem/116505009>

[Jean-Yves Avenard [:jya]]

Pull request: https://github.com/WebKit/WebKit/pull/18690

[EWS]

Committed 268913@main (93421fec4bd1): <https://commits.webkit.org/268913@main>

Reviewed commits have been landed. Closing PR #18690 and removing active labels.