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Missing reversed params comparison ops for C++17

1

C++17 needs additional comparison operator overloads with reversed parameters. For C++20 and newer it is unnecessary due to "synthesized three-way comparison" feature.

mcencora

[Optimization] Optimize build-time for clang and older gcc

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TLDR; Consider optimizing build-time for all single-argument templated constructors, and assignment operators by early-out with an SFINAE `!is_same` Long story: When instantiating a class that wraps (or derives from) `expected`,...

mcencora