[gcc.git] / libstdc++-v3 / ChangeLog

2020-02-26  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/93936
	* include/std/ranges (split_view::_InnerIter::operator==): Compare
	the operands' _M_i rather than their _M_i.current().
	* testsuite/std/ranges/adaptors/split.cc: Augment test.

	P1645R1 constexpr for <numeric> algorithms
	* include/bits/stl_numeric.h (iota, accumulate, inner_product,
	partial_sum, adjacent_difference): Make conditionally constexpr for
	C++20.
	* include/std/numeric (__cpp_lib_constexpr_numeric): Define this feature
	test macro.
	(reduce, transform_reduce, exclusive_scan, inclusive_scan,
	transform_exclusive_scan, transform_inclusive_scan): Make conditionally
	constexpr for C++20.
	* include/std/version (__cpp_lib_constexpr_numeric): Define.
	* testsuite/26_numerics/accumulate/constexpr.cc: New test.
	* testsuite/26_numerics/adjacent_difference/constexpr.cc: Likewise.
	* testsuite/26_numerics/exclusive_scan/constexpr.cc: Likewise.
	* testsuite/26_numerics/inclusive_scan/constexpr.cc: Likewise.
	* testsuite/26_numerics/inner_product/constexpr.cc: Likewise.
	* testsuite/26_numerics/iota/constexpr.cc: Likewise.
	* testsuite/26_numerics/partial_sum/constexpr.cc: Likewise.
	* testsuite/26_numerics/reduce/constexpr.cc: Likewise.
	* testsuite/26_numerics/transform_exclusive_scan/constexpr.cc: Likewise.
	* testsuite/26_numerics/transform_inclusive_scan/constexpr.cc: Likewise.
	* testsuite/26_numerics/transform_reduce/constexpr.cc: Likewise.

2020-02-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_algo.h (__lexicographical_compare_fn): Declare
	variables in smaller scope and avoid calling ranges::distance when we
	know they are pointers. Remove statically-unreachable use of
	__builtin_unreachable().
	* include/bits/stl_algobase.h (__lexicographical_compare::__lc):
	Define inline.

	* include/std/ranges (__detail::__maybe_empty_t): Define new helper
	alias.
	(__detail::__maybe_const_t): Likewise.
	(__adaptor::_RangeAdaptor): Use __maybe_empty_t.
	(transform_view, take_view, take_while_view, elements_view): Use
	__maybe_const_t.
	(join_view, split_view): Use both.

2020-02-25  Patrick Palka  <ppalka@redhat.com>

	LWG 3397 basic_istream_view::iterator should not provide
	iterator_category
	* include/std/ranges (basic_istream_view:_Iterator::iterator_category):
	Rename to ...
	(basic_istream_view:_Iterator::iterator_concept): ... this.
	* testsuite/std/ranges/istream_view.cc: Augment test.

	LWG 3325 Constrain return type of transformation function for
	transform_view
	* include/std/ranges (transform_view): Constrain the return type of the
	transformation function as per LWG 3325.
	* testsuite/std/ranges/adaptors/lwg3325_neg.cc: New test.

	LWG 3313 join_view::_Iterator::operator-- is incorrectly constrained
	* include/std/ranges (join_view::_Iterator::operator--): Require that
	range_reference_t<_Base> models common_range.
	* testsuite/std/ranges/adaptors/lwg3313_neg.cc: New test.

	LWG 3301 transform_view::_Iterator has incorrect iterator_category
	* include/std/ranges (transform_view::_Iterator::_S_iter_cat): Adjust
	determination of iterator_category as per LWG 3301.
	* testsuite/std/ranges/adaptors/transform.cc: Augment test.

	LWG 3292 iota_view is under-constrained
	* include/std/ranges (iota_view): Require that _Winc models semiregular
	  as per LWG 3292.
	* testsuite/std/ranges/iota/lwg3292_neg.cc: New test.

2020-02-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_algobase.h (__copy_or_move): Do not use memmove
	during constant evaluation. Call __builtin_memmove directly instead of
	__memmove.
	(__copy_or_move_backward): Likewise.
	* include/bits/stl_algobase.h (__memmove): Remove.
	(__copy_move<M, true, random_access_iterator_tag>::__copy_m)
	(__copy_move_backward<M, true, random_access_iterator_tag>::__copy_m):
	Use __builtin_memmove directly instead of __memmove.
	(__copy_move_a2): Do not use memmove during constant evaluation.
	(__copy_move_backward_a2): Use _IsMove constant to select correct
	__copy_move_backward specialization.
	* testsuite/25_algorithms/copy_backward/constexpr.cc: Check for copies
	begin turned into moves during constant evaluation.

	* testsuite/25_algorithms/move_backward/93872.cc: Add test left out of
	previous commit.

	PR libstdc++/93872
	* include/bits/stl_algobase.h (__memmove): Cast away const before
	doing move assignment.
	* testsuite/25_algorithms/move/93872.cc: New test.
	* testsuite/25_algorithms/move_backward/93872.cc: New test.

2020-02-24  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/93884
	* include/bits/ranges_algobase.h (__copy_or_move,
	__copy_or_move_backward): Don't inspect the iter_value_t of the output
	iterator, instead inspect its iterator_traits directly.
	* include/bits/stl_iterator.h (back_insert_iterator::container):
	Conditionally initialize.
	(back_insert_iterator::difference_type): Conditionally define.
	(back_insert_iterator::back_insert_iterator): Conditionally define this
	default constructor.
	(front_insert_iterator::container): Conditionally initialize.
	(front_insert_iterator::difference_type): Conditionally define.
	(front_insert_iterator::front_insert_iterator): Conditionally define
	this default constructor.
	* 24_iterators/back_insert_iterator/pr93884.cc: New test.
	* 24_iterators/front_insert_iterator/pr93884.cc: New test.

	P0769R2 Add shift to <algorithm>
	* include/bits/ranges_algo.h (shift_left, shift_right): New.
	* testsuite/25_algorithms/shift_left/1.cc: New test.
	* testsuite/25_algorithms/shift_right/1.cc: New test.

2020-02-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stream_iterator.h (istream_iterator(default_sentinel_t)):
	Make noexcept-specifier conditional.
	* testsuite/24_iterators/istream_iterator/cons/sentinel.cc: Check
	noexcept-specifier.

	* include/bits/stream_iterator.h (istream_iterator(default_sentinel_t)):
	Add constructor.
	(operator==(istream_iterator, default_sentinel_t)): Add operator.
	(ostream_iterator::difference_type): Define to ptrdiff_t for C++20.
	* include/bits/streambuf_iterator.h
	(istreambuf_iterator(default_sentinel_t)): Add constructor.
	(operator==(istreambuf_iterator, default_sentinel_t)): Add operator.
	* testsuite/24_iterators/istream_iterator/cons/sentinel.cc:
	New test.
	* testsuite/24_iterators/istream_iterator/sentinel.cc: New test.
	* testsuite/24_iterators/istreambuf_iterator/cons/sentinel.cc:
	New test.
	* testsuite/24_iterators/istreambuf_iterator/sentinel.cc: New test.

	* include/std/ranges (__deep_const_range, __enable_view_impl): Remove.
	(ranges::enable_view): Simplify (LWG 3326).
	* include/bits/range_access.h (ranges::enable_view): Declare.
	* include/bits/regex.h (__enable_view_impl): Remove partial
	specialization.
	* include/bits/stl_multiset.h (__enable_view_impl): Likewise.
	* include/bits/stl_set.h (__enable_view_impl): Likewise.
	* include/bits/unordered_set.h (__enable_view_impl): Likewise.
	* include/debug/multiset.h (__enable_view_impl): Likewise.
	* include/debug/set.h (__enable_view_impl): Likewise.
	* include/debug/unordered_set (__enable_view_impl): Likewise.
	* include/experimental/string_view (ranges::enable_view): Define
	partial specialization.
	* include/std/span (ranges::enable_view): Likewise.
	* include/std/string_view (ranges::enable_view): Likewise.
	* testsuite/std/ranges/view.cc: Check satisfaction of updated concept.

2020-02-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/optional (operator<=>(optional<T>, optional<U>))
	(operator<=>(optional<T>, nullopt), operator<=>(optional<T>, U)):
	Define for C++20.
	* include/std/tuple (__tuple_cmp): New helper function for <=>.
	(operator<=>(tuple<T...>, tuple<U>...)): Define for C++20.
	* include/std/variant (operator<=>(variant<T...>, variant<T...>))
	(operator<=>(monostate, monostate)): Define for C++20.
	* testsuite/20_util/optional/relops/three_way.cc: New test.
	* testsuite/20_util/tuple/comparison_operators/three_way.cc: New test.
	* testsuite/20_util/variant/89851.cc: Move to ...
	* testsuite/20_util/variant/relops/89851.cc: ... here.
	* testsuite/20_util/variant/90008.cc: Move to ...
	* testsuite/20_util/variant/relops/90008.cc: ... here.
	* testsuite/20_util/variant/relops/three_way.cc: New test.

2020-02-20  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (views::__adaptor::__maybe_refwrap): New utility
	function.
	(views::__adaptor::_RangeAdaptor::operator()): Add comments.  Use
	__maybe_refwrap to capture lvalue references by reference, and then use
	unwrap_reference_t to forward the by-reference captures as references.
	* testsuite/std/ranges/adaptors/split.cc: Augment test.
	* testsuite/std/ranges/adaptors/split_neg.cc: New test.

	* include/std/ranges (iota_view): Forward declare _Sentinel.
	(iota_view::_Iterator): Befriend _Sentinel.
	(iota_view::_Sentinel::_M_equal): New member function.
	(iota_view::_Sentinel::operator==): Use it.
	(views::_Iota::operator()): Forward __f using the correct type.
	* testsuite/std/ranges/access/ssize.cc (test06): Don't call views::iota
	with integers of different signedness, to appease iota_view's deduction
	guide.
	* testsuite/std/ranges/iota/iota_view.cc: Augment test.

2020-02-20  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/range_access.h (ranges::begin): Reject array of
	incomplete type.
	(ranges::end, ranges::size): Require arrays to be bounded.
	(ranges::data): Require lvalue or borrowed_range.
	(ranges::iterator_t): Remove constraint.
	* testsuite/std/ranges/access/begin.cc: Do not check array of
	incomplete type.
	* testsuite/std/ranges/access/begin_neg.cc: New test.
	* testsuite/std/ranges/access/end_neg.cc: Adjust expected error.
	* testsuite/std/ranges/access/size_neg.cc: Adjust expected error.
	* testsuite/std/ranges/access/ssize.cc: Do not check array of
	incomplete type.

	* include/std/system_error (error_category::operator<=>)
	(operator<=>(const error_code&, const error_code&))
	(operator<=>(const error_condition&, const error_condition&)): Define
	for C++20.
	* testsuite/19_diagnostics/error_category/operators/less.cc: New test.
	* testsuite/19_diagnostics/error_category/operators/three_way.cc: New
	test.
	* testsuite/19_diagnostics/error_code/operators/equal.cc: Remove
	incorrect comment.
	* testsuite/19_diagnostics/error_code/operators/less.cc: New test.
	* testsuite/19_diagnostics/error_code/operators/not_equal.cc: Remove
	incorrect comment.
	* testsuite/19_diagnostics/error_code/operators/three_way.cc: New test.
	* testsuite/19_diagnostics/error_condition/operators/equal.cc: Remove
	incorrect comment.
	* testsuite/19_diagnostics/error_condition/operators/less.cc: New test.
	* testsuite/19_diagnostics/error_condition/operators/not_equal.cc:
	Remove incorrect comment.
	* testsuite/19_diagnostics/error_condition/operators/three_way.cc: New
	test.

	* libsupc++/typeinfo (type_info::operator!=): Remove for C++20.

	* include/std/thread (thread::id::operator<=>): Define for C++20.
	* testsuite/30_threads/thread/id/70294.cc: Do not take addresses of
	functions in namespace std.
	* testsuite/30_threads/thread/id/operators_c++20.cc: New test.

2020-02-19  Patrick Palka  <ppalka@redhat.com>

	* testsuite/std/ranges/adaptors/split.cc (test03): Don't include the
	null terminator of the underlying string as part of the test_range.
	(main): Call test03.

2020-02-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h (common_iterator): Add copyable<I>
	requirement (LWG 3385).
	* testsuite/24_iterators/headers/iterator/synopsis_c++20.cc: Adjust
	expected declaration.

	* include/std/ranges (take_while_view, drop_view, drop_while_view)
	(elements_view:_Iterator): Initialize data members (LWG 3364).

	* libsupc++/compare (three_way_comparable): Remove always-false check
	that should have been removed with weak_equality (P1959R0).
	(three_way_comparable_with): Likewise. Reorder requirements (LWG 3360).

	* include/std/concepts (__detail::__partially_ordered_with): Move here
	from <compare>.
	(totally_ordered, totally_ordered_with): Use __partially_ordered_with
	to simplify definition (LWG 3331).
	* libsupc++/compare (__detail::__partially_ordered_with): Move to
	<concepts>.

	* include/std/concepts (totally_ordered_with): Remove redundant
	requirement (LWG 3329).

	* include/std/ranges (__detail::__convertible_to_non_slicing): New
	helper concept.
	(__detail::__pair_like_convertible_to): Remove.
	(__detail::__pair_like_convertible_from): Add requirements for
	non-slicing conversions.
	(subrange): Constrain constructors with __convertible_to_non_slicing.
	Remove constructors from pair-like types. Add new deduction guide.
	* testsuite/std/ranges/subrange/lwg3282_neg.cc: New test.

	* include/bits/iterator_concepts.h (iter_move): Add declaration to
	prevent unqualified lookup finding a suitable declaration (LWG 3247).

	* include/std/memory_resource (polymorphic_allocator::allocate)
	(polymorphic_allocator::allocate_object): Change type of exception to
	bad_array_new_length (LWG 3237).
	* testsuite/20_util/polymorphic_allocator/lwg3237.cc: New test.

	* include/std/type_traits (__cpp_lib_unwrap_ref): Define (LWG 3348).
	* include/std/version (__cpp_lib_unwrap_ref): Likewise.
	* testsuite/20_util/unwrap_reference/1.cc: Check macro.
	* testsuite/20_util/unwrap_reference/3.cc: New test.

	* include/std/numeric (midpoint(T8, T*)): Do not check for complete
	type during overload resolution, use static assert instead (LWG 3200).
	* testsuite/26_numerics/midpoint/pointer.cc: Do not test with
	incomplete type.
	* testsuite/26_numerics/midpoint/pointer_neg.cc: New test.

	* include/std/span (span(T (&)[N])): Use non-deduced context to
	prevent first parameter from interfering with class template argument
	deduction (LWG 3369).
	* testsuite/23_containers/span/deduction.cc: Add missing 'const'.
	* testsuite/23_containers/span/lwg3255.cc: Check for construction from
	rvalues.

	* include/std/span (span::const_iterator, span::const_reverse_iterator)
	(span::cbegin(), span::cend(), span::crbegin(), span::crend()):
	Remove (LWG 3320).
	* testsuite/23_containers/span/everything.cc: Replace uses of cbegin
	and cend.
	* testsuite/20_util/specialized_algorithms/destroy/constrained.cc:
	Likewise.
	* testsuite/20_util/specialized_algorithms/uninitialized_copy/
	constrained.cc: Likewise.
	* testsuite/20_util/specialized_algorithms/
	uninitialized_default_construct/constrained.cc: Likewise.
	* testsuite/20_util/specialized_algorithms/uninitialized_fill/
	constrained.cc: Likewise.
	* testsuite/20_util/specialized_algorithms/uninitialized_move/
	constrained.cc: Likewise.
	* testsuite/20_util/specialized_algorithms/
	uninitialized_value_construct/constrained.cc: Likewise.

	* include/bits/range_access.h (range_size_t): Define alias template.
	* include/std/ranges (all_view): Rename to views::all_t (LWG 3335).
	* testsuite/std/ranges/adaptors/filter.cc: Adjust to new name.

	* include/std/ranges (filter_view, transform_view, take_view)
	(join_view, split_view, reverse_view): Remove commented-out converting
	constructors (LWG 3280).

	* include/std/memory (uninitialized_construct_using_allocator): Use
	std::construct_at (LWG 3321).

	* include/std/memory_resource (polymorphic_allocator::allocate_bytes)
	(polymorphic_allocator::allocate_object)
	(polymorphic_allocator::new_object): Add nodiscard attribute (LWG3304).

	LWG 3379. "safe" in several library names is misleading
	* include/bits/range_access.h (enable_safe_range): Rename to
	enable_borrowed_range.
	(__detail::__maybe_safe_range): Rename to __maybe_borrowed_range.
	(safe_range): Rename to borrowed_range.
	* include/bits/ranges_algo.h: Adjust to use new names.
	* include/bits/ranges_algobase.h: Likewise.
	* include/bits/ranges_uninitialized.h: Likewise.
	* include/std/ranges: Likewise.
	(safe_iterator_t): Rename to borrowed_iterator_t.
	(safe_subrange_t): Rename to borrowed_subrange_t.
	* include/std/span: Adjust to use new names.
	* include/std/string_view: Likewise.
	* include/experimental/string_view: Likewise.
	* testsuite/std/ranges/access/begin.cc: Likewise.
	* testsuite/std/ranges/access/cbegin.cc: Likewise.
	* testsuite/std/ranges/access/cdata.cc: Likewise.
	* testsuite/std/ranges/access/cend.cc: Likewise.
	* testsuite/std/ranges/access/crbegin.cc: Likewise.
	* testsuite/std/ranges/access/crend.cc: Likewise.
	* testsuite/std/ranges/access/data.cc: Likewise.
	* testsuite/std/ranges/access/end.cc: Likewise.
	* testsuite/std/ranges/access/rbegin.cc: Likewise.
	* testsuite/std/ranges/access/rend.cc: Likewise.
	* testsuite/std/ranges/safe_range.cc: Likewise.
	* testsuite/std/ranges/safe_range_types.cc: Likewise.
	* testsuite/util/testsuite_iterators.h: Likewise.

	* include/std/ranges (tuple_element<0, const subrange<I, S, K>>)
	(tuple_element<1, const subrange<I, S, K>>): Add partial
	specializations (LWG 3398).
	* testsuite/std/ranges/subrange/tuple_like.cc: New test.

	* include/bits/ranges_algo.h (__find_fn, __find_first_of_fn)
	(__adjacent_find_fn, __remove_if_fn, __remove_copy_if_fn)
	(__unique_fn, __unique_copy_fn): Remove redundant conversions to bool.

2020-02-18  Patrick Palka  <ppalka@redhat.com>

	P1983R0 Wording for GB301, US296, US292, US291, and US283
	* include/std/ranges (filter_view::pred): New member function.
	(join_view::_Iterator::_Iterator): Remove now-redundant comment since
	P1983R0 fixes the highlighted issue in the same way.
	(join_view::_Iterator<_Const>): Add friend
	join_view::_Iterator<!_Const>.
	(join_view::_M_inner): Remove mutable specifier, effectively reverting
	the proposed wording changes of P3278.
	(join_view::begin): Refine the condition for when to return a const
	iterator.
	(split_view::_OuterIter::_OuterIter): Adjust constraints.
	* testsuite/std/ranges/adaptors/filter.cc: Test that filter_view::pred
	exists and works.

2020-02-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93818
	* include/std/ranges (_RangeAdaptor): Add deduction guide.
	(filter_view::_Iterator): Add alias _Vp_iter and use in place of
	iterator_t<_Vp>.
	(filter_view::_Iterator::_S_iter_cat()): Add 'typename'.
	(transform_view::_Iterator): Add alias _Base_iter and use in place of
	iterator_t<_Base>.
	(transform_view::_Iterator::_S_iter_cat()): Add 'typename'.
	(join_view::_Iterator): Add _Outer_iter and _Inner_iter aliases.
	(join_view::_Iterator::_S_iter_cat()): Add 'typename'.
	(split_view::_InnerIter::_S_iter_cat()): Likewise.

	* testsuite/20_util/integer_comparisons/equal.cc: Fix invalid
	assumption that long is wider than int.
	* testsuite/20_util/integer_comparisons/greater_equal.cc: Likewise.
	* testsuite/20_util/integer_comparisons/less.cc: Likewise.
	* testsuite/20_util/integer_comparisons/less_equal.cc: Likewise.
	* testsuite/20_util/integer_comparisons/not_equal.cc: Likewise.

	P1976R2 Fixed-size span construction from dynamic range
	* include/std/span (__cpp_lib_span): Update value.
	(span(It, size_type), span(It, End)): Make conditionally explicit. Add
	assertion.
	(span(R&&), span(const span<OType, OExtent>&)): Likewise and relax
	constraints.
	(span::first<Count>(), span::last<Count>()): Use explicit type in
	return statement.
	(as_bytes, as_writable_bytes): Likewise.
	* include/std/version (__cpp_lib_span): Update value.
	* testsuite/23_containers/span/1.cc: Check new value.
	* testsuite/23_containers/span/2.cc: Check new value.
	* testsuite/23_containers/span/explicit.cc: New test.

	* include/std/span (span::__is_compatible_array): Simplify alias
	template by using requires-clause.
	(span::__is_compatible_ref): New alias template for constraining
	constructors.
	(span::__is_compatible_iterator, span::__is_compatible_range): Remove.
	(span(It, size_type), span(It, End)): Use __is_compatible_ref.
	(span(T(&)[N], span(array<T, N>&), span(const array<T, N>&)): Remove
	redundant parentheses.
	(span(R&&)): Add missing constraints.

	* include/std/span (span): Reorder members and rename template
	parameters to match declarations in the C++2a working paper.

	P2116R0 Remove tuple-like protocol support from fixed-extent span
	* include/std/span (get, tuple_size, tuple_element): Remove.
	* testsuite/23_containers/span/everything.cc: Remove checks for
	tuple-like API.
	* testsuite/23_containers/span/get_neg.cc: Remove.
	* testsuite/23_containers/span/tuple_element_dynamic_neg.cc: Remove.
	* testsuite/23_containers/span/tuple_element_oob_neg.cc: Remove.
	* testsuite/23_containers/span/tuple_size_neg.cc: Remove.

2020-02-17  Patrick Palka  <ppalka@redhat.com>

	P2106R0 Alternative wording for GB315 and GB316
	* include/bits/ranges_algo.h (in_fun_result): New.
	(for_each_result, for_each_n_result): Change into an alias of
	in_fun_result.
	(in_in_result): New.
	(mismatch_result): Change into an alias of in_in_result.
	(copy_if_result): Change into an alias of in_out_result.
	(swap_ranges_result): Change into an alias of in_in_result.
	(unary_transform_result): Change into an alias of in_out_result.
	(in_in_out_result): New.
	(binary_transform_result): Change into an alias of in_in_out_result.
	(replace_copy_result, replace_copy_if_result, remove_copy_if_result,
	remove_copy_result, unique_copy_result, reverse_copy_result,
	rotate_copy_result, partial_sort_copy_result): Change into an alias of
	in_out_result.
	(in_out_out_result): New.
	(partition_copy_result, merge_result): Change into an alias of
	in_out_out_result.
	(set_union_result, set_intersection_result): Change into an alias of
	in_in_out_result.
	(set_difference_result): Change into an alias of in_out_result.
	(set_symmetric_difference): Change into an alias of in_in_out_result.
	(min_max_result): New.
	(minmax_result, minmax_element_result): Change into an alias of
	min_max_result.
	(in_found_result): New.
	(next_permutation_result, prev_permutation_result): Change into an alias
	of in_found_result.
	(__next_permutation_fn::operator(), __prev_permutation_fn::operator()):
	Adjust following changes to next_permutation_result and
	prev_permutation_result.
	* include/bits/ranges_algobase.h (in_out_result): New.
	(copy_result, move_result, move_backward_result, copy_backward_result,
	copy_n_result): Change into an alias of in_out_result.
	* include/bits/ranges_uninitialized.h (uninitialized_copy_result,
	uninitialized_copy_n_result, uninitialized_move_result,
	uninitialized_move_n_result): Likewise.
	* testsuite/25_algorithms/next_permutation/constrained.cc: Adjust uses of
	structured bindings.
	* testsuite/25_algorithms/prev_permutation/constrained.cc: Likewise.

	P1243R4 Rangify new algorithms
	* include/bits/ranges_algo.h (for_each_n_result, __for_each_n_fn,
	for_each_n, __sample_fn, sample, __clamp_fn, clamp): New.
	* testsuite/25_algorithms/clamp/constrained.cc: New test.
	* testsuite/25_algorithms/for_each/constrained.cc: Augment test.
	* testsuite/25_algorithms/sample/constrained.cc: New test.

2020-02-17  Jonathan Wakely  <jwakely@redhat.com>

	P1964R2 Wording for boolean-testable
	* include/bits/ranges_algo.h (__find_fn, __find_first_of_fn)
	(__adjacent_find_fn): Cast result of predicate to bool.
	* include/std/concepts (__boolean): Remove.
	(__detail::__boolean_testable_impl, __detail::__boolean_testable): Add
	new helper concepts.
	(__detail::__weakly_eq_cmp_with, totally_ordered, totally_ordered_with)
	(predicate): Use __boolean_testable instead of boolean.
	* libsupc++/compare (__detail::__partially_ordered, _Synth3way):
	Likewise.

	P1970R2 Consistency for size() functions: Add ranges::ssize
	* include/bits/range_access.h (_SSize, ssize): Define for C++20.
	* testsuite/std/ranges/access/ssize.cc: New test.

	P1956R1 On the names of low-level bit manipulation functions
	* include/bits/hashtable_policy.h: Update comment.
	* include/std/bit (__ispow2, __ceil2, __floor2, __log2p1): Rename.
	(ispow2, ceil2, floor2, log2p1): Likewise.
	(__cpp_lib_int_pow2): Add feature test macro.
	* include/std/charconv (__to_chars_len_2): Adjust use of __log2p1.
	* include/std/memory (assume_aligned): Adjust use of ispow2.
	* include/std/version (__cpp_lib_int_pow2): Add.
	* libsupc++/new_opa.cc: Adjust use of __ispow2.
	* src/c++17/memory_resource.cc: Likewise, and for __ceil2 and __log2p1.
	* testsuite/17_intro/freestanding.cc: Adjust use of ispow2.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.pow.two/bit_ceil.cc: ... here.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2_neg.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.pow.two/bit_ceil_neg.cc: ... here.
	* testsuite/26_numerics/bit/bit.pow.two/floor2.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.pow.two/bit_floor.cc: ... here.
	* testsuite/26_numerics/bit/bit.pow.two/log2p1.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.pow.two/bit_width.cc: ... here.
	* testsuite/26_numerics/bit/bit.pow.two/ispow2.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.pow.two/has_single_bit.cc: ... here.

	* include/std/charconv: Add comment.

	PR libstdc++/92546 (partial)
	* include/bits/random.h (uniform_random_bit_generator): Move definition
	to <bits/uniform_int_dist.h>.
	* include/bits/ranges_algo.h: Include <bits/uniform_int_dist.h> instead
	of <bits/random.h>.
	* include/bits/ranges_algobase.h: Do not include <cmath>.
	* include/bits/uniform_int_dist.h (uniform_random_bit_generator):
	Move here.
	* include/std/ranges: Do not include <limits>.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error lineno.

	PR libstdc++/92546 (partial)
	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/bits/int_limits.h: New header.
	* include/bits/parse_numbers.h (__select_int::_Select_int): Replace
	numeric_limits with __detail::__int_limits.
	* include/std/bit (__rotl, __rotr, __countl_zero, __countl_one)
	(__countr_zero, __countr_one, __popcount, __ceil2, __floor2, __log2p1):
	Likewise.
	* include/std/charconv (__to_chars_8, __from_chars_binary)
	(__from_chars_alpha_to_num, from_chars): Likewise.
	* include/std/memory_resource (polymorphic_allocator::allocate)
	(polymorphic_allocator::allocate_object): Likewise.
	* include/std/string_view (basic_string_view::_S_compare): Likewise.
	* include/std/utility (in_range): Likewise.
	* testsuite/20_util/integer_comparisons/in_range_neg.cc: Adjust for
	extra error about incomplete type __int_limits<bool>.
	* testsuite/26_numerics/bit/bit.count/countl_one.cc: Include <limits>.
	* testsuite/26_numerics/bit/bit.count/countl_zero.cc: Likewise.
	* testsuite/26_numerics/bit/bit.count/countr_one.cc: Likewise.
	* testsuite/26_numerics/bit/bit.count/countr_zero.cc: Likewise.
	* testsuite/26_numerics/bit/bit.count/popcount.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2_neg.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/floor2.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/ispow2.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/log2p1.cc: Likewise.
	* testsuite/26_numerics/bit/bit.rotate/rotl.cc: Likewise.
	* testsuite/26_numerics/bit/bit.rotate/rotr.cc: Likewise.

	* python/libstdcxx/v6/printers.py (StdCmpCatPrinter.to_string): Update
	value for partial_ordering::unordered.

	* include/bits/iterator_concepts.h (indirectly_copyable_storable): Add
	const-qualified expression variations.
	* include/std/concepts (copyable): Likewise.

	* include/std/type_traits (__is_standard_integer): New helper trait.
	* include/std/utility (cmp_equal, cmp_not_equal, cmp_less, cmp_greater)
	(cmp_less_equal, cmp_greater_equal, in_range): Define for C++20.
	* include/std/version (__cpp_lib_integer_comparison_functions): Define.
	* testsuite/20_util/integer_comparisons/1.cc: New test.
	* testsuite/20_util/integer_comparisons/2.cc: New test.
	* testsuite/20_util/integer_comparisons/equal.cc: New test.
	* testsuite/20_util/integer_comparisons/equal_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/greater_equal.cc: New test.
	* testsuite/20_util/integer_comparisons/greater_equal_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/greater_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/in_range.cc: New test.
	* testsuite/20_util/integer_comparisons/in_range_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/less.cc: New test.
	* testsuite/20_util/integer_comparisons/less_equal.cc: New test.
	* testsuite/20_util/integer_comparisons/less_equal_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/less_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/not_equal.cc: New test.
	* testsuite/20_util/integer_comparisons/not_equal_neg.cc: New test.

2020-02-16  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_algo.h (__lexicographical_compare_fn::operator()):
	Move code after an early exit constexpr if to under an else branch.
	* include/bits/ranges_algobase.h (__equal_fn::operator()): Likewise.

2020-02-15  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_algo.h: Adjust whitespace and formatting.
	* include/bits/ranges_algobase.h: Likewise.
	* include/bits/ranges_uninitialized.h: Likewise.

	* include/bits/ranges_algo.h: (adjacent_find, all_of, any_of,
	binary_search, copy_if, count, count_if, equal_range, find, find_end,
	find_first_of, find_if, find_if_not, for_each, generate, generate_n,
	includes, inplace_merge, is_heap, is_heap_until, is_partitioned,
	is_permutation, is_sorted, is_sorted_until, lexicographical_compare,
	lower_bound, make_heap, max, max_element, merge, min, min_element,
	minmax, minmax_element, mismatch, next_permutation, none_of,
	nth_element, partial_sort, partial_sort_copy, partition, partition_copy,
	partition_point, pop_heap, prev_permutation, push_heap, remove,
	remove_copy, remove_copy_if, remove_if, replace, replace_copy,
	replace_copy_if, replace_if, reverse, reverse_copy, rotate, rotate_copy,
	search, search_n, set_difference, set_intersection,
	set_symmetric_difference, set_union, shuffle, sort, sort_heap,
	stable_partition, stable_sort, swap_ranges, transform, unique,
	unique_copy, upper_bound): Convert into function objects.
	* include/bits/ranges_algobase.h: (equal, copy, move, copy_n, fill_n,
	fill, move_backward, copy_backward): Likewise.
	* include/bits/ranges_uninitialized.h (uninitialized_default_construct,
	uninitialized_default_construct_n, uninitialized_value_construct,
	uninitialized_value_construct_n, uninitialized_copy,
	uninitialized_copy_n, uninitialized_move, uninitialized_move_n,
	uninitialized_fill, uninitialized_fill_n, construct_at, destroy_at,
	destroy, destroy_n): Likewise.

	* include/bits/ranges_algo.h (ranges::__find_end): Fold into ...
	(ranges::find_end): ... here.
	(ranges::__lexicographical_compare): Fold into ...
	(ranges::lexicographical_compare): ... here.
	* include/bits/ranges_algobase.h (ranges::__equal): Fold into ...
	(ranges::equal): ... here.

2020-02-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/erase_if.h (__cpp_lib_erase_if): Define to 202002L.
	* include/std/deque: Likewise.
	* include/std/forward_list: Likewise.
	* include/std/list: Likewise.
	* include/std/string: Likewise.
	* include/std/vector: Likewise.
	* include/std/version: Likewise.
	* testsuite/23_containers/deque/erasure.cc: Test for new value.
	* testsuite/23_containers/forward_list/erasure.cc: Likewise.
	* testsuite/23_containers/list/erasure.cc: Likewise.
	* testsuite/23_containers/map/erasure.cc: Likewise.
	* testsuite/23_containers/set/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_map/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_set/erasure.cc: Likewise.
	* testsuite/23_containers/vector/erasure.cc: Likewise.

2020-02-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/random.h (uniform_random_bit_generator): Require min()
	and max() to be constant expressions and min() to be less than max().
	* testsuite/26_numerics/random/concept.cc: Check additional cases.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error lineno.

2020-02-13  Patrick Palka  <ppalka@redhat.com>

	* include/Makefile.am: Add <bits/ranges_uninitialized.h>.
	* include/Makefile.in: Regenerate.
	* include/bits/ranges_uninitialized.h: New header.
	* include/std/memory: Include it.
	* testsuite/20_util/specialized_algorithms/destroy/constrained.cc: New
	test.
	* .../uninitialized_copy/constrained.cc: New test.
	* .../uninitialized_default_construct/constrained.cc: New test.
	* .../uninitialized_fill/constrained.cc: New test.
	* .../uninitialized_move/constrained.cc: New test.
	* .../uninitialized_value_construct/constrained.cc: New test.

	* include/Makefile.am: Add bits/ranges_algobase.h
	* include/Makefile.in: Regenerate.
	* bits/ranges_algo.h: Include <bits/ranges_algobase.h> and refactor
	existing #includes.
	(__detail::__is_normal_iterator, __detail::is_reverse_iterator,
	__detail::__is_move_iterator, copy_result, move_result,
	__equal, equal, copy_result, move_result, move_backward_result,
	copy_backward_result, __copy_or_move_backward, __copy_or_move, copy,
	move, copy_backward, move_backward, copy_n_result, copy_n, fill_n,
	fill): Split out into ...
	* bits/range_algobase.h: ... this new header.

2020-02-12  Patrick Palka  <ppalka@redhat.com>

	LWG 3389 and LWG 3390
	* include/bits/stl_iterator.h (move_move_iterator): Use std::move when
	constructing the move_iterator with __i.
	(counted_iterator::counted_iterator): Use std::move when initializing
	M_current with __i.
	* testsuite/24_iterators/counted_iterator/lwg3389.cc: New test.
	* testsuite/24_iterators/move_iterator/lwg3390.cc: New test.

2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>

	PR libstdc++/79193
	PR libstdc++/88999

	* configure: Regenerated.

2020-02-12  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/hashtable.h
	(_Hashtable<>(_Hashtable&&, std::allocator_type&)): Add
	missing std namespace qualification to forward call.

2020-02-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/function_objects/range.cmp/equal_to.cc: Fix
	comment.
	* testsuite/20_util/function_objects/range.cmp/less.ccL Likewise.

	* include/std/ranges: Fix non-ASCII characters in comment.

	* include/bits/range_cmp.h (__detail::__eq_builtin_ptr_cmp): Require
	equality comparison to be valid and return bool.
	(__detail::__less_builtin_ptr_cmp): Likewise for less-than comparison.
	* testsuite/20_util/function_objects/range.cmp/equal_to.cc: Check
	type with ambiguous conversion to fundamental types.
	* testsuite/20_util/function_objects/range.cmp/less.cc: Likewise.

2020-02-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (iter_difference_t, iter_value_t):
	Use remove_cvref_t.
	(readable_traits): Rename to indirectly_readable_traits.
	(readable): Rename to indirectly_readable.
	(writable): Rename to indirectly_writable.
	(__detail::__iter_exchange_move): Do not use remove_reference_t.
	(indirectly_swappable): Adjust requires expression parameter types.
	expression.
	* include/bits/ranges_algo.h (ranges::transform, ranges::replace)
	(ranges::replace_if, ranges::generate_n, ranges::generate)
	(ranges::remove): Use new name for writable.
	* include/bits/stl_iterator.h (__detail::__common_iter_has_arrow):
	Use new name for readable.
	* include/ext/pointer.h (readable_traits<_Pointer_adapter<P>>): Use
	new name for readable_traits.
	* testsuite/24_iterators/associated_types/readable.traits.cc: Likewise.
	* testsuite/24_iterators/indirect_callable/projected.cc: Adjust for
	new definition of indirectly_readable.

	* include/bits/stl_iterator.h (__detail::__common_iter_ptr): Change
	to take parameters of common_iterator, instead of the common_iterator
	type itself. Fix argument for __common_iter_has_arrow constraint.
	(iterator_traits<common_iterator<I, S>>::pointer): Adjust.

2020-02-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (iota_view): Add braces to prevent -Wempty-body
	warning.
	(basic_istream_view::_Iterator::operator++()): Add missing return.

2020-02-07  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_algo.h: Remove extraneous &&.

	* include/std/ranges (ranges::__detail::__stream_extractable,
	ranges::basic_istream_view, ranges::istream_view): Define.
	* testsuite/std/ranges/istream_view: New test.

	Implement C++20 range adaptors
	* include/std/ranges: Include <bits/refwrap.h> and <tuple>.
	(subrange::_S_store_size): Mark as const instead of constexpr to
	avoid what seems to be a bug in GCC.
	(__detail::__box): Give it defaulted copy and move constructors.
	(ranges::views::_Single::operator()): Mark constexpr.
	(ranges::views::_Iota::operator()): Mark constexpr.
	(__detail::Empty): Define.
	(ranges::views::__closure::_RangeAdaptor,
	ranges::views::__closure::_RangeAdaptorClosure, ref_view, all_view,
	ranges::views::all, ranges::__detail::find_if,
	ranges::__detail::find_if_not, ranges::__detail::mismatch,
	ranges::detail::min, filter_view, ranges::views::filter, transform_view,
	ranges::views::transform, take_view, ranges::views::take,
	take_while_view, ranges::views::take_while, drop_view,
	ranges::views::drop, join_view, ranges::views::join,
	__detail::require_constant, __detail::tiny_range, split_view,
	ranges::views::split, ranges::views::_Counted, ranges::views::counted,
	common_view, ranges::views::common, reverse_view,
	ranges::views::reverse,
	ranges::views::__detail::__is_reversible_subrange,
	ranges::views::__detail::__is_reverse_view, reverse_view,
	ranges::views::reverse, __detail::__has_tuple_element, elements_view,
	ranges::views::elements, ranges::views::keys, ranges::views::values):
	Define.
	(views): Alias for ranges::views.
	(tuple_size<ranges::subrange<>>, tuple_element<0, ranges::subrange>,
	tuple_element<1, ranges::subrange>): New partial specializations.
	* testsuite/std/ranges/adaptors/all.cc: New test.
	* testsuite/std/ranges/adaptors/common.cc: Likewise.
	* testsuite/std/ranges/adaptors/counted.cc: Likewise.
	* testsuite/std/ranges/adaptors/drop.cc: Likewise.
	* testsuite/std/ranges/adaptors/drop_while.cc: Likewise.
	* testsuite/std/ranges/adaptors/elements.cc: Likewise.
	* testsuite/std/ranges/adaptors/filter.cc: Likewise.
	* testsuite/std/ranges/adaptors/join.cc: Likewise.
	* testsuite/std/ranges/adaptors/reverse.cc: Likewise.
	* testsuite/std/ranges/adaptors/split.cc: Likewise.
	* testsuite/std/ranges/adaptors/take.cc: Likewise.
	* testsuite/std/ranges/adaptors/take_while.cc: Likewise.
	* testsuite/std/ranges/adaptors/transform.cc: Likewise.

2020-02-07  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (__cmp_cat::type): Define typedef for underlying
	type of enumerations and comparison category types.
	(__cmp_cat::_Ord, __cmp_cat::_Ncmp): Add underlying type.
	(__cmp_cat::_Ncmp::unordered): Change value to 2.
	(partial_ordering::_M_value, weak_ordering::_M_value)
	(strong_ordering::_M_value): Change type to __cmp_cat::type.
	(partial_ordering::_M_is_ordered): Remove data member.
	(partial_ordering): Use second bit of _M_value for unordered. Adjust
	comparison operators.
	(weak_ordering::operator partial_ordering): Simplify to remove
	branches.
	(operator<=>(unspecified, weak_ordering)): Likewise.
	(strong_ordering::operator partial_ordering): Likewise.
	(strong_ordering::operator weak_ordering): Likewise.
	(operator<=>(unspecified, strong_ordering)): Likewise.
	* testsuite/18_support/comparisons/categories/partialord.cc: New test.
	* testsuite/18_support/comparisons/categories/strongord.cc: New test.
	* testsuite/18_support/comparisons/categories/weakord.cc: New test.

	* include/std/ranges (iota_view::_Iterator): Fix typo in name of
	__cpp_lib_three_way_comparison macro and use deduced return type for
	operator<=>.
	* testsuite/std/ranges/iota/iterator.cc: New test.

2020-02-07  Patrick Palka  <ppalka@redhat.com>
	    Jonathan Wakely  <jwakely@redhat.com>

	Implement C++20 constrained algorithms
	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/std/algorithm: Include <bits/ranges_algo.h>.
	* include/bits/ranges_algo.h: New file.
	* testsuite/25_algorithms/adjacent_find/constrained.cc: New test.
	* testsuite/25_algorithms/all_of/constrained.cc: New test.
	* testsuite/25_algorithms/any_of/constrained.cc: New test.
	* testsuite/25_algorithms/binary_search/constrained.cc: New test.
	* testsuite/25_algorithms/copy/constrained.cc: New test.
	* testsuite/25_algorithms/copy_backward/constrained.cc: New test.
	* testsuite/25_algorithms/copy_if/constrained.cc: New test.
	* testsuite/25_algorithms/copy_n/constrained.cc: New test.
	* testsuite/25_algorithms/count/constrained.cc: New test.
	* testsuite/25_algorithms/count_if/constrained.cc: New test.
	* testsuite/25_algorithms/equal/constrained.cc: New test.
	* testsuite/25_algorithms/equal_range/constrained.cc: New test.
	* testsuite/25_algorithms/fill/constrained.cc: New test.
	* testsuite/25_algorithms/fill_n/constrained.cc: New test.
	* testsuite/25_algorithms/find/constrained.cc: New test.
	* testsuite/25_algorithms/find_end/constrained.cc: New test.
	* testsuite/25_algorithms/find_first_of/constrained.cc: New test.
	* testsuite/25_algorithms/find_if/constrained.cc: New test.
	* testsuite/25_algorithms/find_if_not/constrained.cc: New test.
	* testsuite/25_algorithms/for_each/constrained.cc: New test.
	* testsuite/25_algorithms/generate/constrained.cc: New test.
	* testsuite/25_algorithms/generate_n/constrained.cc: New test.
	* testsuite/25_algorithms/heap/constrained.cc: New test.
	* testsuite/25_algorithms/includes/constrained.cc: New test.
	* testsuite/25_algorithms/inplace_merge/constrained.cc: New test.
	* testsuite/25_algorithms/is_partitioned/constrained.cc: New test.
	* testsuite/25_algorithms/is_permutation/constrained.cc: New test.
	* testsuite/25_algorithms/is_sorted/constrained.cc: New test.
	* testsuite/25_algorithms/is_sorted_until/constrained.cc: New test.
	* testsuite/25_algorithms/lexicographical_compare/constrained.cc: New
	test.
	* testsuite/25_algorithms/lower_bound/constrained.cc: New test.
	* testsuite/25_algorithms/max/constrained.cc: New test.
	* testsuite/25_algorithms/max_element/constrained.cc: New test.
	* testsuite/25_algorithms/merge/constrained.cc: New test.
	* testsuite/25_algorithms/min/constrained.cc: New test.
	* testsuite/25_algorithms/min_element/constrained.cc: New test.
	* testsuite/25_algorithms/minmax/constrained.cc: New test.
	* testsuite/25_algorithms/minmax_element/constrained.cc: New test.
	* testsuite/25_algorithms/mismatch/constrained.cc: New test.
	* testsuite/25_algorithms/move/constrained.cc: New test.
	* testsuite/25_algorithms/move_backward/constrained.cc: New test.
	* testsuite/25_algorithms/next_permutation/constrained.cc: New test.
	* testsuite/25_algorithms/none_of/constrained.cc: New test.
	* testsuite/25_algorithms/nth_element/constrained.cc: New test.
	* testsuite/25_algorithms/partial_sort/constrained.cc: New test.
	* testsuite/25_algorithms/partial_sort_copy/constrained.cc: New test.
	* testsuite/25_algorithms/partition/constrained.cc: New test.
	* testsuite/25_algorithms/partition_copy/constrained.cc: New test.
	* testsuite/25_algorithms/partition_point/constrained.cc: New test.
	* testsuite/25_algorithms/prev_permutation/constrained.cc: New test.
	* testsuite/25_algorithms/remove/constrained.cc: New test.
	* testsuite/25_algorithms/remove_copy/constrained.cc: New test.
	* testsuite/25_algorithms/remove_copy_if/constrained.cc: New test.
	* testsuite/25_algorithms/remove_if/constrained.cc: New test.
	* testsuite/25_algorithms/replace/constrained.cc: New test.
	* testsuite/25_algorithms/replace_copy/constrained.cc: New test.
	* testsuite/25_algorithms/replace_copy_if/constrained.cc: New test.
	* testsuite/25_algorithms/replace_if/constrained.cc: New test.
	* testsuite/25_algorithms/reverse/constrained.cc: New test.
	* testsuite/25_algorithms/reverse_copy/constrained.cc: New test.
	* testsuite/25_algorithms/rotate/constrained.cc: New test.
	* testsuite/25_algorithms/rotate_copy/constrained.cc: New test.
	* testsuite/25_algorithms/search/constrained.cc: New test.
	* testsuite/25_algorithms/search_n/constrained.cc: New test.
	* testsuite/25_algorithms/set_difference/constrained.cc: New test.
	* testsuite/25_algorithms/set_intersection/constrained.cc: New test.
	* testsuite/25_algorithms/set_symmetric_difference/constrained.cc: New
	test.
	* testsuite/25_algorithms/set_union/constrained.cc: New test.
	* testsuite/25_algorithms/shuffle/constrained.cc: New test.
	* testsuite/25_algorithms/sort/constrained.cc: New test.
	* testsuite/25_algorithms/stable_partition/constrained.cc: New test.
	* testsuite/25_algorithms/stable_sort/constrained.cc: New test.
	* testsuite/25_algorithms/swap_ranges/constrained.cc: New test.
	* testsuite/25_algorithms/transform/constrained.cc: New test.
	* testsuite/25_algorithms/unique/constrained.cc: New test.
	* testsuite/25_algorithms/unique_copy/constrained.cc: New test.
	* testsuite/25_algorithms/upper_bound/constrained.cc: New test.

2020-02-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h (__detail::__common_iter_ptr): Fix PR
	number in comment. Fix indentation.

	* include/bits/stl_algobase.h (__iter_swap, __iter_swap<true>): Remove
	redundant _GLIBCXX20_CONSTEXPR.

	* include/std/ranges (viewable_range): Replace decay_t with
	remove_cvref_t (LWG 3375).

2020-02-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (iter_reference_t)
	(iter_rvalue_reference_t, iter_common_reference_t, indirect_result_t):
	Remove workarounds for PR c++/67704.
	* testsuite/24_iterators/aliases.cc: New test.

2020-02-05  Patrick Palka  <ppalka@redhat.com>

	* include/bits/stl_iterator.h (move_iterator::move_iterator): Move __i
	when initializing _M_current.
	(move_iterator::base): Split into two overloads differing in
	ref-qualifiers as in P1207R4 for C++20.

2020-02-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/functional (_GLIBCXX_NOT_FN_CALL_OP): Un-define after
	use.

	PR libstdc++/93562
	* include/bits/unique_ptr.h (__uniq_ptr_impl::swap): Define.
	(unique_ptr::swap, unique_ptr<T[], D>::swap): Call it.
	* testsuite/20_util/unique_ptr/modifiers/93562.cc: New test.

2020-02-01  Andrew Burgess  <andrew.burgess@embecosm.com>

	* configure: Regenerate.

2020-01-31  Patrick Palka  <ppalka@redhat.com>

	* testsuite/24_iterators/range_operations/distance.cc: Do not assume
	test_range::end() returns the same type as test_range::begin().
	* testsuite/24_iterators/range_operations/next.cc: Likewise.
	* testsuite/24_iterators/range_operations/prev.cc: Likewise.
	* testsuite/util/testsuite_iterators.h (__gnu_test::test_range::end):
	Always return a sentinel<I>.

2020-01-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92895
	* include/std/stop_token (stop_token::stop_possible()): Call new
	_M_stop_possible() function.
	(stop_token::stop_requested()): Do not use stop_possible().
	(stop_token::binary_semaphore): New class, as temporary stand-in for
	std::binary_semaphore.
	(stop_token::_Stop_cb::_M_callback): Add noexcept to type.
	(stop_token::_Stop_cb::_M_destroyed, stop_token::_Stop_cb::_M_done):
	New data members for symchronization with stop_callback destruction.
	(stop_token::_Stop_cb::_Stop_cb): Make non-template.
	(stop_token::_Stop_cb::_M_linked, stop_token::_Stop_cb::_S_execute):
	Remove.
	(stop_token::_Stop_cb::_M_run): New member function.
	(stop_token::_Stop_state::_M_stopped, stop_token::_Stop_state::_M_mtx):
	Remove.
	(stop_token::_Stop_state::_M_owners): New data member to track
	reference count for ownership.
	(stop_token::_Stop_state::_M_value): New data member combining a
	spinlock, the stop requested flag, and the reference count for
	associated stop_source objects.
	(stop_token::_Stop_state::_M_requester): New data member for
	synchronization with stop_callback destruction.
	(stop_token::_Stop_state::_M_stop_possible()): New member function.
	(stop_token::_Stop_state::_M_stop_requested()): Inspect relevant bit
	of _M_value.
	(stop_token::_Stop_state::_M_add_owner)
	(stop_token::_Stop_state::_M_release_ownership)
	(stop_token::_Stop_state::_M_add_ssrc)
	(stop_token::_Stop_state::_M_sub_ssrc): New member functions for
	updating reference counts.
	(stop_token::_Stop_state::_M_lock, stop_token::_Stop_state::_M_unlock)
	(stop_token::_Stop_state::_M_lock, stop_token::_Stop_state::_M_unlock)
	(stop_token::_Stop_state::_M_try_lock)
	(stop_token::_Stop_state::_M_try_lock_and_stop)
	(stop_token::_Stop_state::_M_do_try_lock): New member functions for
	managing spinlock.
	(stop_token::_Stop_state::_M_request_stop): Use atomic operations to
	read and update state. Release lock while running callbacks. Use new
	data members to synchronize with callback destruction.
	(stop_token::_Stop_state::_M_remove_callback): Likewise.
	(stop_token::_Stop_state::_M_register_callback): Use atomic operations
	to read and update state.
	(stop_token::_Stop_state_ref): Handle type to manage _Stop_state,
	replacing shared_ptr.
	(stop_source::stop_source(const stop_source&)): Update reference count.
	(stop_source::operator=(const stop_source&)): Likewise.
	(stop_source::~stop_source()): Likewise.
	(stop_source::stop_source(stop_source&&)): Define as defaulted.
	(stop_source::operator=(stop_source&&)): Establish postcondition on
	parameter.
	(stop_callback): Enforce preconditions on template parameter. Replace
	base class with data member of new _Cb_impl type.
	(stop_callback::stop_callback(const stop_token&, Cb&&))
	(stop_callback::stop_callback(stop_token&&, Cb&&)): Fix TOCTTOU race.
	(stop_callback::_Cb_impl): New type wrapping _Callback member and
	defining the _S_execute member function.
	* testsuite/30_threads/stop_token/stop_callback/deadlock-mt.cc: New
	test.
	* testsuite/30_threads/stop_token/stop_callback/deadlock.cc: New test.
	* testsuite/30_threads/stop_token/stop_callback/destroy.cc: New test.
	* testsuite/30_threads/stop_token/stop_callback/destructible_neg.cc:
	New test.
	* testsuite/30_threads/stop_token/stop_callback/invocable_neg.cc: New
	test.
	* testsuite/30_threads/stop_token/stop_callback/invoke.cc: New test.
	* testsuite/30_threads/stop_token/stop_source/assign.cc: New test.
	* testsuite/30_threads/stop_token/stop_token/stop_possible.cc: New
	test.

	* libsupc++/compare (__detail::__3way_builtin_ptr_cmp): Use
	three_way_comparable_with.
	(__detail::__3way_cmp_with): Remove workaround for fixed bug.
	(compare_three_way::operator()): Remove redundant constraint from
	requires-clause.
	(__detail::_Synth3way::operator()): Use three_way_comparable_with
	instead of workaround.
	* testsuite/18_support/comparisons/object/93479.cc: Prune extra
	output due to simplified constraints on compare_three_way::operator().

	PR libstdc++/93479
	* libsupc++/compare (__3way_builtin_ptr_cmp): Require <=> to be valid.
	* testsuite/18_support/comparisons/object/93479.cc: New test.

	* testsuite/std/ranges/access/end.cc: Do not assume test_range::end()
	returns the same type as test_range::begin(). Add comments.
	* testsuite/std/ranges/access/rbegin.cc: Likewise.
	* testsuite/std/ranges/access/rend.cc: Likewise.
	* testsuite/std/ranges/range.cc: Do not assume the sentinel for
	test_range is the same as its iterator type.
	* testsuite/util/testsuite_iterators.h (test_range::sentinel): Add
	operator- overloads to satisfy sized_sentinel_for when the iterator
	satisfies random_access_iterator.

2020-01-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93470
	* include/bits/refwrap.h (reference_wrapper::operator()): Restrict
	static assertion to object types.

	PR libstdc++/93325
	* acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Use AC_SEARCH_LIBS for
	clock_gettime instead of explicit glibc version check.
	* configure: Regenerate.

2020-01-28  Martin Liska  <mliska@suse.cz>

	PR libstdc++/93478
	* include/std/atomic: Fix typo.
	* include/std/optional: Likewise.

2020-01-27  Andrew Burgess  <andrew.burgess@embecosm.com>

	* configure: Regenerate.

2020-01-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93426
	* include/std/span (span): Fix deduction guide.
	* testsuite/23_containers/span/deduction.cc: New test.

2020-01-24  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (__cmp_cat::_Eq): Remove enumeration type.
	(__cmp_cat::_Ord::equivalent): Add enumerator.
	(__cmp_cat::_Ord::_Less, __cmp_cat::_Ord::_Greater): Rename to less
	and greater.
	(partial_ordering, weak_ordering, strong_ordering): Remove
	constructors taking __cmp_cat::_Eq parameters. Use renamed
	enumerators.

2020-01-24  Maciej W. Rozycki  <macro@wdc.com>

	* acinclude.m4: Handle `--with-toolexeclibdir='.
	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* doc/Makefile.in: Regenerate.
	* include/Makefile.in: Regenerate.
	* libsupc++/Makefile.in: Regenerate.
	* po/Makefile.in: Regenerate.
	* python/Makefile.in: Regenerate.
	* src/Makefile.in: Regenerate.
	* src/c++11/Makefile.in: Regenerate.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++98/Makefile.in: Regenerate.
	* src/filesystem/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

2020-01-23  Alexandre Oliva <oliva@adacore.com>

	* crossconfig.m4 (GLIBCXX_CHECK_MATH_DECL): Reject macros.
	* configure: Rebuild.

	* testsuite/27_io/fpos/mbstate_t/1.cc: Zero-init mbstate_t.

2020-01-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91947
	* include/Makefile.am (${host_builddir}/largefile-config.h): Simplify
	rule.
	* include/Makefile.in: Regenerate.

2020-01-20  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/faq.xml: Fix grammar.
	* doc/xml/manual/appendix_contributing.xml: Improve instructions.
	* doc/xml/manual/spine.xml: Update copyright years.
	* doc/html/*: Regenerate.

2020-01-19  Eric S. Raymond <esr@thyrsus.com>

	* doc/xml/faq.xml: Update for SVN -> Git transition.
	* doc/xml/manual/appendix_contributing.xml: Likewise.
	* doc/xml/manual/status_cxx1998.xml: Likewise.
	* doc/xml/manual/status_cxx2011.xml: Likewise.
	* doc/xml/manual/status_cxx2014.xml: Likewise.
	* doc/xml/manual/status_cxx2017.xml: Likewise.
	* doc/xml/manual/status_cxx2020.xml: Likewise.
	* doc/xml/manual/status_cxxtr1.xml: Likewise.
	* doc/xml/manual/status_cxxtr24733.xml: Likewise.

2020-01-18  Iain Sandoe  <iain@sandoe.co.uk>

	* include/Makefile.am: Add coroutine to the std set.
	* include/Makefile.in: Regenerated.
	* include/std/coroutine: New file.

2020-01-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92376
	* include/bits/c++config: Only do PSTL config when the header is
	present, to fix freestanding.
	* libsupc++/new_opa.cc [!_GLIBCXX_HOSTED]: Declare allocation
	functions if they were detected by configure.

2020-01-16  Kai-Uwe Eckhardt  <kuehro@gmx.de>
	    Matthew Bauer  <mjbauer95@gmail.com>
	    Jonathan Wakely  <jwakely@redhat.com>

	PR bootstrap/64271 (partial)
	* config/os/bsd/netbsd/ctype_base.h (ctype_base::mask): Change type
	to unsigned short.
	(ctype_base::alpha, ctype_base::digit, ctype_base::xdigit)
	(ctype_base::print, ctype_base::graph, ctype_base::alnum): Sync
	definitions with NetBSD upstream.
	(ctype_base::blank): Use _CTYPE_BL.
	* config/os/bsd/netbsd/ctype_configure_char.cc (_C_ctype_): Remove
	Declaration.
	(ctype<char>::classic_table): Use _C_ctype_tab_ instead of _C_ctype_.
	(ctype<char>::do_toupper, ctype<char>::do_tolower): Cast char
	parameters to unsigned char.
	* config/os/bsd/netbsd/ctype_inline.h (ctype<char>::is): Likewise.

2020-01-16  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/91263
	* include/bits/hashtable.h (_Hashtable<>): Make _Equality<> friend.
	* include/bits/hashtable_policy.h: Include <bits/stl_algo.h>.
	(_Equality_base): Remove.
	(_Equality<>::_M_equal): Review implementation. Use
	std::is_permutation.
	* testsuite/23_containers/unordered_multiset/operators/1.cc
	(Hash, Equal, test02, test03): New.
	* testsuite/23_containers/unordered_set/operators/1.cc
	(Hash, Equal, test02, test03): New.

2020-01-15  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93267
	* include/bits/iterator_concepts.h (__max_diff_type, __max_size_type):
	Move here from <bits/range_access.h> and define using __int128 when
	available.
	(__is_integer_like, __is_signed_integer_like): Move here from
	<bits/range_access.h>.
	(weakly_incrementable): Use __is_signed_integer_like.
	* include/bits/range_access.h (__max_diff_type, __max_size_type)
	(__is_integer_like, __is_signed_integer_like): Move to
	<bits/iterator_concepts.h>.
	(__make_unsigned_like_t): Move here from <ranges>.
	* include/std/ranges (__make_unsigned_like_t): Move to
	<bits/range_access.h>.
	(iota_view): Replace using-directive with using-declarations.
	* testsuite/std/ranges/iota/93267.cc: New test.
	* testsuite/std/ranges/iota_view.cc: Move to new 'iota' sub-directory.

2020-01-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93244
	* include/bits/fs_path.h (path::generic_string<C,A>)
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Convert root-dir to forward-slash.
	* testsuite/27_io/filesystem/path/generic/generic_string.cc: Check
	root-dir is converted to forward slash in generic pathname.
	* testsuite/27_io/filesystem/path/generic/utf.cc: New test.
	* testsuite/27_io/filesystem/path/generic/wchar_t.cc: New test.

	PR libstdc++/58605
	* include/bits/atomic_base.h (__cpp_lib_atomic_value_initialization):
	Define.
	(__atomic_flag_base, __atomic_base, __atomic_base<_PTp*>)
	(__atomic_float): Add default member initializer for C++20.
	* include/std/atomic (atomic): Likewise.
	(atomic::atomic()): Remove noexcept-specifier on default constructor.
	* include/std/version (__cpp_lib_atomic_value_initialization): Define.
	* testsuite/29_atomics/atomic/cons/assign_neg.cc: Adjust dg-error line
	number.
	* testsuite/29_atomics/atomic/cons/copy_neg.cc: Likewise.
	* testsuite/29_atomics/atomic/cons/value_init.cc: New test.
	* testsuite/29_atomics/atomic_flag/cons/value_init.cc: New test.
	* testsuite/29_atomics/atomic_flag/requirements/trivial.cc: Adjust
	expected result for is_trivially_default_constructible.
	* testsuite/29_atomics/atomic_float/requirements.cc: Likewise.
	* testsuite/29_atomics/atomic_float/value_init.cc: New test.
	* testsuite/29_atomics/atomic_integral/cons/assign_neg.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/cons/copy_neg.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/cons/value_init.cc
	* testsuite/29_atomics/atomic_integral/requirements/trivial.cc: Adjust
	expected results for is_trivially_default_constructible.
	* testsuite/util/testsuite_common_types.h (has_trivial_dtor): Add
	new test generator.

2020-01-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_iterators.h: Improve comment.

	* testsuite/25_algorithms/equal/deque_iterators/1.cc: Don't use C++11
	initialization syntax.

	PR libstdc++/92285
	* include/bits/streambuf_iterator.h (istreambuf_iterator): Make type
	of base class independent of __cplusplus value.
	[__cplusplus < 201103L] (istreambuf_iterator::reference): Override the
	type defined in the base class
	* testsuite/24_iterators/istreambuf_iterator/92285.cc: New test.
	* testsuite/24_iterators/istreambuf_iterator/requirements/
	base_classes.cc: Adjust expected base class for C++98.

2020-01-09  Olivier Hainque  <hainque@adacore.com>

	* doc/xml/manual/appendix_contributing.xml: Document _C2
	as a reserved identifier, by VxWorks.
	* include/bits/stl_map.h: Rename _C2 template typenames	as _Cmp2.
	* include/bits/stl_multimap.h: Likewise.

2020-01-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/ext/extptr_allocator.h (_ExtPtr_allocator::operator==)
	(_ExtPtr_allocator::operator!=): Add missing const qualifiers.
	* include/ext/pointer.h (readable_traits<_Pointer_adapter<S>>): Add
	partial specialization to disambiguate the two constrained
	specializations.

	* include/experimental/type_traits (experimental::is_pod_v): Disable
	-Wdeprecated-declarations warnings around reference to std::is_pod.
	* include/std/type_traits (is_pod_v): Likewise.
	* testsuite/18_support/max_align_t/requirements/2.cc: Also check
	is_standard_layout and is_trivial. Do not check is_pod for C++20.
	* testsuite/20_util/is_pod/requirements/explicit_instantiation.cc:
	Add -Wno-deprecated for C++20.
	* testsuite/20_util/is_pod/requirements/typedefs.cc: Likewise.
	* testsuite/20_util/is_pod/value.cc: Likewise.
	* testsuite/experimental/type_traits/value.cc: Likewise.

2020-01-09  JeanHeyd "ThePhD" Meneide  <phdofthehouse@gmail.com>

	* include/bits/c++config (_GLIBCXX20_DEPRECATED): Add new macro.
	* include/std/type_traits (is_pod, is_pod_v): Deprecate for C++20.
	* testuite/20_util/is_pod/deprecated-2a.cc: New test.

2020-01-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93205
	* include/bits/random.h (operator>>): Check stream operation succeeds.
	* include/bits/random.tcc (operator<<): Remove redundant __ostream_type
	typedefs.
	(operator>>): Remove redundant __istream_type typedefs. Check stream
	operations succeed.
	(__extract_params): New function to fill a vector from a stream.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error line.

	PR libstdc++/93208
	* config/abi/pre/gnu.ver: Add new exports.
	* include/std/memory_resource (memory_resource::~memory_resource()):
	Do not define inline.
	(monotonic_buffer_resource::~monotonic_buffer_resource()): Likewise.
	* src/c++17/memory_resource.cc (memory_resource::~memory_resource()):
	Define.
	(monotonic_buffer_resource::~monotonic_buffer_resource()): Define.
	* testsuite/20_util/monotonic_buffer_resource/93208.cc: New test.

2020-01-09  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/92124
	* include/bits/hashtable.h (_Hashtable<>::__alloc_node_gen_t): New
	template alias.
	(_Hashtable<>::__fwd_value_for): New.
	(_Hashtable<>::_M_assign_elements<>): Remove _NodeGenerator template
	parameter.
	(_Hashtable<>::_M_assign<>): Add _Ht template parameter.
	(_Hashtable<>::operator=(const _Hashtable<>&)): Adapt.
	(_Hashtable<>::_M_move_assign): Adapt. Replace std::move_if_noexcept
	with std::move.
	(_Hashtable<>::_Hashtable(const _Hashtable&)): Adapt.
	(_Hashtable<>::_Hashtable(const _Hashtable&, const allocator_type&)):
	Adapt.
	(_Hashtable<>::_Hashtable(_Hashtable&&, const allocator_type&)):
	Adapt.
	* testsuite/23_containers/unordered_set/92124.cc: New.

2020-01-08  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93201
	* src/c++17/fs_ops.cc (do_remove_all): New function implementing more
	detailed error reporting for remove_all. Check result of recursive
	call before incrementing iterator.
	(remove_all(const path&), remove_all(const path&, error_code&)): Use
	do_remove_all.
	* src/filesystem/ops.cc (remove_all(const path&, error_code&)): Check
	result of recursive call before incrementing iterator.
	* testsuite/27_io/filesystem/operations/remove_all.cc: Check errors
	are reported correctly.
	* testsuite/experimental/filesystem/operations/remove_all.cc: Likewise.

2020-01-07  Thomas Rodgers  <trodgers@redhat.com>

	* include/std/condition_variable
	(condition_variable_any::wait_on): Rename to match current draft
	standard.
	(condition_variable_any::wait_on_until): Likewise.
	(condition_variable_any::wait_on_for): Likewise.
	* testsuite/30_threads/condition_variable_any/stop_token/wait_on.cc:
	Adjust tests to account for renamed methods.

2020-01-07  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/92124
	* include/bits/stl_tree.h
	(_Rb_tree<>::_M_move_assign(_Rb_tree&, false_type)): Replace
	std::move_if_noexcept by std::move.
	* testsuite/23_containers/map/92124.cc: New.
	* testsuite/23_containers/set/92124.cc: New.

2020-01-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stop_token (stop_token): Remove operator!= (LWG 3254).
	(stop_source): Likewise (LWG 3362).
	* testsuite/30_threads/stop_token/stop_source.cc: Test equality
	comparisons.

	* include/bits/stl_algobase.h (__is_byte_iter, __min_cmp)
	(lexicographical_compare_three_way): Do not depend on
	__cpp_lib_concepts.
	* include/std/version (__cpp_lib_three_way_comparison): Only define
	when __cpp_lib_concepts is defined.
	* libsupc++/compare (__cpp_lib_three_way_comparison): Likewise.

2020-01-03  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_algobase.h (lexicographical_compare_three_way):
	Only define four-argument overload when __cpp_lib_concepts is defined.

2020-01-01  John David Anglin  <danglin@gcc.gnu.org>

	* config/abi/post/hppa-linux-gnu/baseline_symbols.txt: Update.

2020-01-01  Jakub Jelinek  <jakub@redhat.com>

	Update copyright years.
\f
Copyright (C) 2020 Free Software Foundation, Inc.

Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.