xref: /freebsd-src/contrib/llvm-project/libcxx/include/__algorithm/ranges_is_partitioned.h (revision 0fca6ea1d4eea4c934cfff25ac9ee8ad6fe95583)
181ad6265SDimitry Andric //===----------------------------------------------------------------------===//
281ad6265SDimitry Andric //
381ad6265SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
481ad6265SDimitry Andric // See https://llvm.org/LICENSE.txt for license information.
581ad6265SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
681ad6265SDimitry Andric //
781ad6265SDimitry Andric //===----------------------------------------------------------------------===//
881ad6265SDimitry Andric 
981ad6265SDimitry Andric #ifndef _LIBCPP___ALGORITHM_RANGES_IS_PARTITIONED_H
1081ad6265SDimitry Andric #define _LIBCPP___ALGORITHM_RANGES_IS_PARTITIONED_H
1181ad6265SDimitry Andric 
1281ad6265SDimitry Andric #include <__config>
1381ad6265SDimitry Andric #include <__functional/identity.h>
1481ad6265SDimitry Andric #include <__functional/invoke.h>
1581ad6265SDimitry Andric #include <__iterator/concepts.h>
1681ad6265SDimitry Andric #include <__iterator/indirectly_comparable.h>
1781ad6265SDimitry Andric #include <__iterator/projected.h>
1881ad6265SDimitry Andric #include <__ranges/access.h>
1981ad6265SDimitry Andric #include <__ranges/concepts.h>
2081ad6265SDimitry Andric #include <__utility/move.h>
2181ad6265SDimitry Andric 
2281ad6265SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
2381ad6265SDimitry Andric #  pragma GCC system_header
2481ad6265SDimitry Andric #endif
2581ad6265SDimitry Andric 
26b3edf446SDimitry Andric _LIBCPP_PUSH_MACROS
27b3edf446SDimitry Andric #include <__undef_macros>
28b3edf446SDimitry Andric 
2906c3fb27SDimitry Andric #if _LIBCPP_STD_VER >= 20
3081ad6265SDimitry Andric 
3181ad6265SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD
3281ad6265SDimitry Andric 
3381ad6265SDimitry Andric namespace ranges {
3481ad6265SDimitry Andric namespace __is_partitioned {
3581ad6265SDimitry Andric struct __fn {
3681ad6265SDimitry Andric   template <class _Iter, class _Sent, class _Proj, class _Pred>
3706c3fb27SDimitry Andric   _LIBCPP_HIDE_FROM_ABI constexpr static bool
3806c3fb27SDimitry Andric   __is_partitioned_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) {
3981ad6265SDimitry Andric     for (; __first != __last; ++__first) {
4081ad6265SDimitry Andric       if (!std::invoke(__pred, std::invoke(__proj, *__first)))
4181ad6265SDimitry Andric         break;
4281ad6265SDimitry Andric     }
4381ad6265SDimitry Andric 
4481ad6265SDimitry Andric     if (__first == __last)
4581ad6265SDimitry Andric       return true;
4681ad6265SDimitry Andric     ++__first;
4781ad6265SDimitry Andric 
4881ad6265SDimitry Andric     for (; __first != __last; ++__first) {
4981ad6265SDimitry Andric       if (std::invoke(__pred, std::invoke(__proj, *__first)))
5081ad6265SDimitry Andric         return false;
5181ad6265SDimitry Andric     }
5281ad6265SDimitry Andric 
5381ad6265SDimitry Andric     return true;
5481ad6265SDimitry Andric   }
5581ad6265SDimitry Andric 
5606c3fb27SDimitry Andric   template <input_iterator _Iter,
5706c3fb27SDimitry Andric             sentinel_for<_Iter> _Sent,
5881ad6265SDimitry Andric             class _Proj = identity,
5981ad6265SDimitry Andric             indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
60*0fca6ea1SDimitry Andric   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool
6106c3fb27SDimitry Andric   operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const {
6206c3fb27SDimitry Andric     return __is_partitioned_impl(std::move(__first), std::move(__last), __pred, __proj);
6381ad6265SDimitry Andric   }
6481ad6265SDimitry Andric 
6581ad6265SDimitry Andric   template <input_range _Range,
6681ad6265SDimitry Andric             class _Proj = identity,
6781ad6265SDimitry Andric             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
68*0fca6ea1SDimitry Andric   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr bool
6906c3fb27SDimitry Andric   operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const {
7006c3fb27SDimitry Andric     return __is_partitioned_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
7181ad6265SDimitry Andric   }
7281ad6265SDimitry Andric };
7381ad6265SDimitry Andric } // namespace __is_partitioned
7481ad6265SDimitry Andric 
7581ad6265SDimitry Andric inline namespace __cpo {
7681ad6265SDimitry Andric inline constexpr auto is_partitioned = __is_partitioned::__fn{};
7781ad6265SDimitry Andric } // namespace __cpo
7881ad6265SDimitry Andric } // namespace ranges
7981ad6265SDimitry Andric 
8081ad6265SDimitry Andric _LIBCPP_END_NAMESPACE_STD
8181ad6265SDimitry Andric 
8206c3fb27SDimitry Andric #endif // _LIBCPP_STD_VER >= 20
8381ad6265SDimitry Andric 
84b3edf446SDimitry Andric _LIBCPP_POP_MACROS
85b3edf446SDimitry Andric 
8681ad6265SDimitry Andric #endif // _LIBCPP___ALGORITHM_RANGES_IS_PARTITIONED_H
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