libcxx/include/__algorithm/ranges_remove_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_REMOVE_COPY_IF_H
  10 #define _LIBCPP___ALGORITHM_RANGES_REMOVE_COPY_IF_H
  11
  12 #include <__algorithm/in_out_result.h>
  13 #include <__algorithm/make_projected.h>
  14 #include <__algorithm/remove_copy_if.h>
  15 #include <__config>
  16 #include <__functional/identity.h>
  17 #include <__functional/invoke.h>
  18 #include <__functional/ranges_operations.h>
  19 #include <__iterator/concepts.h>
  20 #include <__iterator/iterator_traits.h>
  21 #include <__iterator/projected.h>
  22 #include <__ranges/access.h>
  23 #include <__ranges/concepts.h>
  24 #include <__ranges/dangling.h>
  25 #include <__utility/forward.h>
  26 #include <__utility/move.h>
  27
  28 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  29 #  pragma GCC system_header
  30 #endif
  31
  32 #if _LIBCPP_STD_VER >= 20
  33
  34 _LIBCPP_BEGIN_NAMESPACE_STD
  35
  36 namespace ranges {
  37
  38 template <class _InIter, class _OutIter>
  39 using remove_copy_if_result = in_out_result<_InIter, _OutIter>;
  40
  41 template <class _InIter, class _Sent, class _OutIter, class _Proj, class _Pred>
  42 _LIBCPP_HIDE_FROM_ABI constexpr in_out_result<_InIter, _OutIter>
  43 __remove_copy_if_impl(_InIter __first, _Sent __last, _OutIter __result, _Pred& __pred, _Proj& __proj) {
  44   for (; __first != __last; ++__first) {
  45     if (!std::invoke(__pred, std::invoke(__proj, *__first))) {
  46       *__result = *__first;
  47       ++__result;
  48     }
  49   }
  50   return {std::move(__first), std::move(__result)};
  51 }
  52
  53 namespace __remove_copy_if {
  54
  55 struct __fn {
  56   template <input_iterator _InIter,
  57             sentinel_for<_InIter> _Sent,
  58             weakly_incrementable _OutIter,
  59             class _Proj = identity,
  60             indirect_unary_predicate<projected<_InIter, _Proj>> _Pred>
  61     requires indirectly_copyable<_InIter, _OutIter>
  62   _LIBCPP_HIDE_FROM_ABI constexpr remove_copy_if_result<_InIter, _OutIter>
  63   operator()(_InIter __first, _Sent __last, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
  64     return ranges::__remove_copy_if_impl(std::move(__first), std::move(__last), std::move(__result), __pred, __proj);
  65   }
  66
  67   template <input_range _Range,
  68             weakly_incrementable _OutIter,
  69             class _Proj = identity,
  70             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
  71     requires indirectly_copyable<iterator_t<_Range>, _OutIter>
  72   _LIBCPP_HIDE_FROM_ABI constexpr remove_copy_if_result<borrowed_iterator_t<_Range>, _OutIter>
  73   operator()(_Range&& __range, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
  74     return ranges::__remove_copy_if_impl(
  75         ranges::begin(__range), ranges::end(__range), std::move(__result), __pred, __proj);
  76   }
  77 };
  78
  79 } // namespace __remove_copy_if
  80
  81 inline namespace __cpo {
  82 inline constexpr auto remove_copy_if = __remove_copy_if::__fn{};
  83 } // namespace __cpo
  84 } // namespace ranges
  85
  86 _LIBCPP_END_NAMESPACE_STD
  87
  88 #endif // _LIBCPP_STD_VER >= 20
  89
  90 #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_COPY_IF_H