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1 //===----------------------------------------------------------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
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10 #define _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
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11 #include <__config>
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12
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13 #include <__algorithm/ranges_find_if.h>
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14 #include <__functional/identity.h>
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15 #include <__functional/invoke.h>
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16 #include <__functional/ranges_operations.h>
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17 #include <__iterator/concepts.h>
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18 #include <__iterator/iter_move.h>
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19 #include <__iterator/permutable.h>
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20 #include <__iterator/projected.h>
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21 #include <__ranges/access.h>
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22 #include <__ranges/concepts.h>
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23 #include <__ranges/subrange.h>
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24 #include <__utility/move.h>
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25
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26 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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27 # pragma GCC system_header
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28 #endif
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29
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30 #if _LIBCPP_STD_VER > 17
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31
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32 _LIBCPP_BEGIN_NAMESPACE_STD
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33
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34 namespace ranges {
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35
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36 template <class _Iter, class _Sent, class _Proj, class _Pred>
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37 _LIBCPP_HIDE_FROM_ABI constexpr
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38 subrange<_Iter> __remove_if_impl(_Iter __first, _Sent __last, _Pred& __pred, _Proj& __proj) {
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39 auto __new_end = ranges::__find_if_impl(__first, __last, __pred, __proj);
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40 if (__new_end == __last)
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41 return {__new_end, __new_end};
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42
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43 _Iter __i = __new_end;
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44 while (++__i != __last) {
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45 if (!std::invoke(__pred, std::invoke(__proj, *__i))) {
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46 *__new_end = ranges::iter_move(__i);
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47 ++__new_end;
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48 }
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49 }
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50 return {__new_end, __i};
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51 }
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52
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53 namespace __remove_if {
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54 struct __fn {
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55
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56 template <permutable _Iter, sentinel_for<_Iter> _Sent,
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57 class _Proj = identity,
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58 indirect_unary_predicate<projected<_Iter, _Proj>> _Pred>
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59 _LIBCPP_HIDE_FROM_ABI constexpr
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60 subrange<_Iter> operator()(_Iter __first, _Sent __last, _Pred __pred, _Proj __proj = {}) const {
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61 return ranges::__remove_if_impl(std::move(__first), std::move(__last), __pred, __proj);
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62 }
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63
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64 template <forward_range _Range,
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65 class _Proj = identity,
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66 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred>
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67 requires permutable<iterator_t<_Range>>
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68 _LIBCPP_HIDE_FROM_ABI constexpr
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69 borrowed_subrange_t<_Range> operator()(_Range&& __range, _Pred __pred, _Proj __proj = {}) const {
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70 return ranges::__remove_if_impl(ranges::begin(__range), ranges::end(__range), __pred, __proj);
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71 }
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72
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73 };
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74 } // namespace __remove_if
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75
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76 inline namespace __cpo {
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77 inline constexpr auto remove_if = __remove_if::__fn{};
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78 } // namespace __cpo
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79 } // namespace ranges
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80
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81 _LIBCPP_END_NAMESPACE_STD
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82
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83 #endif // _LIBCPP_STD_VER > 17
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84
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85 #endif // _LIBCPP___ALGORITHM_RANGES_REMOVE_IF_H
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