Refactor: access SumType value by index, not type #92
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Previously, code that already knew the desired index was forced to compute a type to pass to get!T or memberName!T, just for get!T or memberName!T to turn that type back into an index. Removing this unnecessary round trip simplifies the code. Additionally, since memberName is no longer dependent on SumType.Types, it can be moved to module scope, and its instantiations can be shared across different SumType instances. Phobos PR: dlang/phobos#10633
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Previously, code that already knew the desired index was forced to compute a type to pass to
get!TormemberName!T, just forget!TormemberName!Tto turn that type back into an index. Removing this unnecessary round trip simplifies the code.Additionally, since
memberNameis no longer dependent onSumType.Types, it can be moved to module scope, and its instantiations can be shared across differentSumTypeinstances.Phobos PR: dlang/phobos#10633