[Webkit-unassigned] [Bug 230907] New: Add support for sending Expected<void, E> in IPC messages

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230907

            Bug ID: 230907
           Summary: Add support for sending Expected<void, E> in IPC
                    messages
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bburg at apple.com

While developing WebInspectorUIExtensionController it became apparent that Expected<void, Inspector::ExtensionError> does not work as expected. The first of many compilation errors looks something like:

In file included from /Users/bburg/repos/webkit/OpenSource/WebKitBuild/Release/DerivedSources/WebKit2/WebInspectorUIExtensionControllerMessageReceiver.cpp:29:
/Users/bburg/repos/webkit/OpenSource/Source/WebKit/Platform/IPC/ArgumentCoders.h:658:38: note: in instantiation of template class 'std::optional<void>' requested here
            std::optional<ValueType> value;
In file included from /Users/bburg/repos/webkit/OpenSource/WebKitBuild/Release/DerivedSources/WebKit2/WebInspectorUIExtensionControllerMessageReceiver.cpp:27:
In file included from /Users/bburg/repos/webkit/OpenSource/Source/WebKit/WebProcess/Inspector/WebInspectorUIExtensionController.h:30:
In file included from /Users/bburg/repos/webkit/OpenSource/Source/WebKit/Platform/IPC/Connection.h:31:
/Users/bburg/repos/webkit/OpenSource/Source/WebKit/Platform/IPC/Decoder.h:114:23: note: in instantiation of member function 'IPC::ArgumentCoder<std::experimental::expected<void, Inspector::ExtensionError>>::decode' requested here
            t = Impl::decode(*this);
/Users/bburg/repos/webkit/OpenSource/WebKitBuild/Release/DerivedSources/WebKit2/WebInspectorUIExtensionControllerMessageReceiver.cpp:180:13: note: in instantiation of function template specialization 'IPC::Decoder::operator>><std::experimental::expected<void, Inspector::ExtensionError>>' requested here
    decoder >> result;


I believe this can be fixed with a special-cased implementation in wtf/persistence/PersistentCoders.h

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