libcxx/include/__algorithm/ranges_copy_if.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___ALGORITHM_RANGES_COPY_IF_H
  10 #define _LIBCPP___ALGORITHM_RANGES_COPY_IF_H
  11
  12 #include <__algorithm/copy_if.h>
  13 #include <__algorithm/in_out_result.h>
  14 #include <__config>
  15 #include <__functional/identity.h>
  16 #include <__functional/invoke.h>
  17 #include <__iterator/concepts.h>
  18 #include <__iterator/projected.h>
  19 #include <__ranges/access.h>
  20 #include <__ranges/concepts.h>
  21 #include <__ranges/dangling.h>
  22 #include <__utility/move.h>
  23
  24 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  25 #  pragma GCC system_header
  26 #endif
  27
  28 _LIBCPP_PUSH_MACROS
  29 #include <__undef_macros>
  30
  31 #if _LIBCPP_STD_VER >= 20
  32
  33 _LIBCPP_BEGIN_NAMESPACE_STD
  34
  35 namespace ranges {
  36
  37 template <class _Ip, class _Op>
  38 using copy_if_result = in_out_result<_Ip, _Op>;
  39
  40 struct __copy_if {
  41   template <input_iterator _Iter,
  42             sentinel_for<_Iter> _Sent,
  43             weakly_incrementable _OutIter,
  44             class _Proj = identity,
  45             indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
  46     requires indirectly_copyable<_Iter, _OutIter>
  47   _LIBCPP_HIDE_FROM_ABI constexpr copy_if_result<_Iter, _OutIter>
  48   operator()(_Iter __first, _Sent __last, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
  49     auto __res = std::__copy_if(std::move(__first), std::move(__last), std::move(__result), __pred, __proj);
  50     return {std::move(__res.first), std::move(__res.second)};
  51   }
  52
  53   template <input_range _Range,
  54             weakly_incrementable _OutIter,
  55             class _Proj = identity,
  56             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
  57     requires indirectly_copyable<iterator_t<_Range>, _OutIter>
  58   _LIBCPP_HIDE_FROM_ABI constexpr copy_if_result<borrowed_iterator_t<_Range>, _OutIter>
  59   operator()(_Range&& __r, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
  60     auto __res = std::__copy_if(ranges::begin(__r), ranges::end(__r), std::move(__result), __pred, __proj);
  61     return {std::move(__res.first), std::move(__res.second)};
  62   }
  63 };
  64
  65 inline namespace __cpo {
  66 inline constexpr auto copy_if = __copy_if{};
  67 } // namespace __cpo
  68 } // namespace ranges
  69
  70 _LIBCPP_END_NAMESPACE_STD
  71
  72 #endif // _LIBCPP_STD_VER >= 20
  73
  74 _LIBCPP_POP_MACROS
  75
  76 #endif // _LIBCPP___ALGORITHM_RANGES_COPY_IF_H