[Webkit-unassigned] [Bug 164526] New: Implement WTF::Expected

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164526

            Bug ID: 164526
           Summary: Implement WTF::Expected
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Template Framework
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jfbastien at apple.com

As described in http://wg21.link/p0323r1

std::expected isn't in C++17, and may be in C++20. It's a nice complement to std::any / std::optional because it's a type-tagged union which has a single expected result but could also contain an error.

This would be useful in the WebAssembly parser, for example.

Using this implementation will allow us to provide feedback to the standards committee and guide std::expected's design before it gets standardized. I've already sent a bunch of feedback to the author based on my experience implementing this.

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