v1/__algorithm/ranges_remove_copy_if.h

0001 //===----------------------------------------------------------------------===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef _LIBCPP___ALGORITHM_RANGES_REMOVE_COPY_IF_H
0010 #define _LIBCPP___ALGORITHM_RANGES_REMOVE_COPY_IF_H
0011
0012 #include <__algorithm/in_out_result.h>
0013 #include <__algorithm/make_projected.h>
0014 #include <__algorithm/remove_copy_if.h>
0015 #include <__config>
0016 #include <__functional/identity.h>
0017 #include <__functional/invoke.h>
0018 #include <__functional/ranges_operations.h>
0019 #include <__iterator/concepts.h>
0020 #include <__iterator/iterator_traits.h>
0021 #include <__iterator/projected.h>
0022 #include <__ranges/access.h>
0023 #include <__ranges/concepts.h>
0024 #include <__ranges/dangling.h>
0025 #include <__utility/forward.h>
0026 #include <__utility/move.h>
0027
0028 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0029 #  pragma GCC system_header
0030 #endif
0031
0032 _LIBCPP_PUSH_MACROS
0033 #include <__undef_macros>
0034
0035 #if _LIBCPP_STD_VER >= 20
0036
0037 _LIBCPP_BEGIN_NAMESPACE_STD
0038
0039 namespace ranges {
0040
0041 template <class _InIter, class _OutIter>
0042 using remove_copy_if_result = in_out_result<_InIter, _OutIter>;
0043
0044 template <class _InIter, class _Sent, class _OutIter, class _Proj, class _Pred>
0045 _LIBCPP_HIDE_FROM_ABI constexpr in_out_result<_InIter, _OutIter>
0046 __remove_copy_if_impl(_InIter __first, _Sent __last, _OutIter __result, _Pred& __pred, _Proj& __proj) {
0047   for (; __first != __last; ++__first) {
0048     if (!std::invoke(__pred, std::invoke(__proj, *__first))) {
0049       *__result = *__first;
0050       ++__result;
0051     }
0052   }
0053   return {std::move(__first), std::move(__result)};
0054 }
0055
0056 struct __remove_copy_if {
0057   template <input_iterator _InIter,
0058             sentinel_for<_InIter> _Sent,
0059             weakly_incrementable _OutIter,
0060             class _Proj = identity,
0061             indirect_unary_predicate<projected<_InIter, _Proj>> _Pred>
0062     requires indirectly_copyable<_InIter, _OutIter>
0063   _LIBCPP_HIDE_FROM_ABI constexpr remove_copy_if_result<_InIter, _OutIter>
0064   operator()(_InIter __first, _Sent __last, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
0065     return ranges::__remove_copy_if_impl(std::move(__first), std::move(__last), std::move(__result), __pred, __proj);
0066   }
0067
0068   template <input_range _Range,
0069             weakly_incrementable _OutIter,
0070             class _Proj = identity,
0071             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
0072     requires indirectly_copyable<iterator_t<_Range>, _OutIter>
0073   _LIBCPP_HIDE_FROM_ABI constexpr remove_copy_if_result<borrowed_iterator_t<_Range>, _OutIter>
0074   operator()(_Range&& __range, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
0075     return ranges::__remove_copy_if_impl(
0076         ranges::begin(__range), ranges::end(__range), std::move(__result), __pred, __proj);
0077   }
0078 };
0079
0080 inline namespace __cpo {
0081 inline constexpr auto remove_copy_if = __remove_copy_if{};
0082 } // namespace __cpo
0083 } // namespace ranges
0084
0085 _LIBCPP_END_NAMESPACE_STD
0086
0087 #endif // _LIBCPP_STD_VER >= 20
0088
0089 _LIBCPP_POP_MACROS
0090
0091 #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_COPY_IF_H