37f33df706
This adds another chunk of the <ranges> header. The changes from P1456R1 (Move-only views) and P1862R1 (Range adaptors for non-copyable iterators) are included, but not the changes from P1870R1 (forwarding-range<T> is too subtle). The tests for subrange and iota_view are poor and should be improved. * include/bits/regex.h (match_results): Specialize __enable_view_impl. * include/bits/stl_set.h (set): Likewise. * include/bits/unordered_set.h (unordered_set, unordered_multiset): Likewise. * include/debug/multiset.h (__debug::multiset): Likewise. * include/debug/set.h (__debug::set): Likewise. * include/debug/unordered_set (__debug::unordered_set) (__debug::unordered_multiset): Likewise. * include/std/ranges (ranges::view, ranges::enable_view) (ranges::view_interface, ranges::subrange, ranges::empty_view) (ranges::single_view, ranges::views::single, ranges::iota_view) (ranges::views::iota): Define for C++20. * testsuite/std/ranges/empty_view.cc: New test. * testsuite/std/ranges/iota_view.cc: New test. * testsuite/std/ranges/single_view.cc: New test. * testsuite/std/ranges/view.cc: New test. From-SVN: r278370
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