Common/Result: Swap order of template parameters to match C++26's std::expected. #14154
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…::expected, make all member functions constexpr, and add moving "unexpected" conversion constructor for consistency.
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Our
Common::Resultis very similar to C++26's std::expected, but we have the template parameters swapped, which I think is confusing.I think (Expected, Unexpected) parameter order is less confusing in general.
Also:
Made all member functions constexpr.
Added moving "unexpected" conversion constructor for consistency.