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 _LIBCPP_PUSH_MACROS
  33 #include <__undef_macros>
  34
  35 #if _LIBCPP_STD_VER >= 20
  36
  37 _LIBCPP_BEGIN_NAMESPACE_STD
  38
  39 namespace ranges {
  40
  41 template <class _InIter, class _OutIter>
  42 using remove_copy_if_result = in_out_result<_InIter, _OutIter>;
  43
  44 template <class _InIter, class _Sent, class _OutIter, class _Proj, class _Pred>
  45 _LIBCPP_HIDE_FROM_ABI constexpr in_out_result<_InIter, _OutIter>
  46 __remove_copy_if_impl(_InIter __first, _Sent __last, _OutIter __result, _Pred& __pred, _Proj& __proj) {
  47   for (; __first != __last; ++__first) {
  48     if (!std::invoke(__pred, std::invoke(__proj, *__first))) {
  49       *__result = *__first;
  50       ++__result;
  51     }
  52   }
  53   return {std::move(__first), std::move(__result)};
  54 }
  55
  56 namespace __remove_copy_if {
  57
  58 struct __fn {
  59   template <input_iterator _InIter,
  60             sentinel_for<_InIter> _Sent,
  61             weakly_incrementable _OutIter,
  62             class _Proj = identity,
  63             indirect_unary_predicate<projected<_InIter, _Proj>> _Pred>
  64     requires indirectly_copyable<_InIter, _OutIter>
  65   _LIBCPP_HIDE_FROM_ABI constexpr remove_copy_if_result<_InIter, _OutIter>
  66   operator()(_InIter __first, _Sent __last, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
  67     return ranges::__remove_copy_if_impl(std::move(__first), std::move(__last), std::move(__result), __pred, __proj);
  68   }
  69
  70   template <input_range _Range,
  71             weakly_incrementable _OutIter,
  72             class _Proj = identity,
  73             indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
  74     requires indirectly_copyable<iterator_t<_Range>, _OutIter>
  75   _LIBCPP_HIDE_FROM_ABI constexpr remove_copy_if_result<borrowed_iterator_t<_Range>, _OutIter>
  76   operator()(_Range&& __range, _OutIter __result, _Pred __pred, _Proj __proj = {}) const {
  77     return ranges::__remove_copy_if_impl(
  78         ranges::begin(__range), ranges::end(__range), std::move(__result), __pred, __proj);
  79   }
  80 };
  81
  82 } // namespace __remove_copy_if
  83
  84 inline namespace __cpo {
  85 inline constexpr auto remove_copy_if = __remove_copy_if::__fn{};
  86 } // namespace __cpo
  87 } // namespace ranges
  88
  89 _LIBCPP_END_NAMESPACE_STD
  90
  91 #endif // _LIBCPP_STD_VER >= 20
  92
  93 _LIBCPP_POP_MACROS
  94
  95 #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_COPY_IF_H