v1/__algorithm/ranges_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_COPY_IF_H
0010 #define _LIBCPP___ALGORITHM_RANGES_COPY_IF_H
0011
0012 #include <__algorithm/copy_if.h>
0013 #include <__algorithm/in_out_result.h>
0014 #include <__config>
0015 #include <__functional/identity.h>
0016 #include <__functional/invoke.h>
0017 #include <__iterator/concepts.h>
0018 #include <__iterator/projected.h>
0019 #include <__ranges/access.h>
0020 #include <__ranges/concepts.h>
0021 #include <__ranges/dangling.h>
0022 #include <__utility/move.h>
0023
0024 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0025 #  pragma GCC system_header
0026 #endif
0027
0028 _LIBCPP_PUSH_MACROS
0029 #include <__undef_macros>
0030
0031 #if _LIBCPP_STD_VER >= 20
0032
0033 _LIBCPP_BEGIN_NAMESPACE_STD
0034
0035 namespace ranges {
0036
0037 template <class _Ip, class _Op>
0038 using copy_if_result = in_out_result<_Ip, _Op>;
0039
0040 struct __copy_if {
0041   template <input_iterator _Iter,
0042             sentinel_for<_Iter> _Sent,
0043             weakly_incrementable _OutIter,
0044             class _Proj = identity,
0045             indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
0046     requires indirectly_copyable<_Iter, _OutIter>
0047   _LIBCPP_HIDE_FROM_ABI constexpr copy_if_result<_Iter, _OutIter>
0048   operator()(_Iter __first, _Sent __last, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
0049     auto __res = std::__copy_if(std::move(__first), std::move(__last), std::move(__result), __pred, __proj);
0050     return {std::move(__res.first), std::move(__res.second)};
0051   }
0052
0053   template <input_range _Range,
0054             weakly_incrementable _OutIter,
0055             class _Proj = identity,
0056             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
0057     requires indirectly_copyable<iterator_t<_Range>, _OutIter>
0058   _LIBCPP_HIDE_FROM_ABI constexpr copy_if_result<borrowed_iterator_t<_Range>, _OutIter>
0059   operator()(_Range&& __r, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
0060     auto __res = std::__copy_if(ranges::begin(__r), ranges::end(__r), std::move(__result), __pred, __proj);
0061     return {std::move(__res.first), std::move(__res.second)};
0062   }
0063 };
0064
0065 inline namespace __cpo {
0066 inline constexpr auto copy_if = __copy_if{};
0067 } // namespace __cpo
0068 } // namespace ranges
0069
0070 _LIBCPP_END_NAMESPACE_STD
0071
0072 #endif // _LIBCPP_STD_VER >= 20
0073
0074 _LIBCPP_POP_MACROS
0075
0076 #endif // _LIBCPP___ALGORITHM_RANGES_COPY_IF_H