Refactoring around tuple-like, pair-like, and subrange
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Effectively mirrors LLVM-85206. In the current standard wording, the "_`pair-like`_ but not `subrange`" pattern is used more often than plain _`pair-like`_. So it's probably worthwhile to carve out the `_Pair_like_non_subrange` concept. `_Tuple_like_non_subrange` seems less worthwhile, but it should be helpful in the constructors of `tuple`. Moreover, with `_Pair_like_non_subrange` carved out, we can put the definitions of `_Pair_like` in C++20 & 23 modes together in `<xutility>`. `_Pair_like_non_subrange` should be also helpful for extracting the key object from pair-like construction argument via `_In_place_key_extract_map` (since C++23). I think this can be done in a future PR. Other changes: Renaming the template parameter of `subrange`'s conversion function to `_PairLike`, making the identifier `_Pair_like in MSVC STL always mean the concept.
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Effectively mirrors LLVM-85206.
In the current standard wording, the "
pair-likebut notsubrange" pattern is used more often than plainpair-like. So it's probably worthwhile to carve out the_Pair_like_non_subrangeconcept._Tuple_like_non_subrangeseems less worthwhile, but it should be helpful in the constructors oftuple.Moreover, with
_Pair_like_non_subrangecarved out, we can put the definitions of_Pair_likein C++20 & 23 modes together in<xutility>._Pair_like_non_subrangeshould be also helpful for extracting the key object from pair-like construction argument via_In_place_key_extract_map(since C++23). I think this can be done in a future PR.Other changes: Renaming the template parameter of
subrange's conversion function to_PairLike, making the identifier_Pair_likein MSVC STL always mean the concept.