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