| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ALGORITHM_RANGES_COPY_IF_H |
| #define _LIBCPP___ALGORITHM_RANGES_COPY_IF_H |
| |
| #include <__algorithm/in_out_result.h> |
| #include <__config> |
| #include <__functional/identity.h> |
| #include <__functional/invoke.h> |
| #include <__iterator/concepts.h> |
| #include <__iterator/projected.h> |
| #include <__ranges/access.h> |
| #include <__ranges/concepts.h> |
| #include <__ranges/dangling.h> |
| #include <__utility/move.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| #if _LIBCPP_STD_VER > 17 |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| namespace ranges { |
| |
| template<class _Ip, class _Op> |
| using copy_if_result = in_out_result<_Ip, _Op>; |
| |
| namespace __copy_if { |
| struct __fn { |
| |
| template <class _InIter, class _Sent, class _OutIter, class _Proj, class _Pred> |
| _LIBCPP_HIDE_FROM_ABI static constexpr |
| copy_if_result <_InIter, _OutIter> |
| __copy_if_impl(_InIter __first, _Sent __last, _OutIter __result, _Pred& __pred, _Proj& __proj) { |
| for (; __first != __last; ++__first) { |
| if (std::invoke(__pred, std::invoke(__proj, *__first))) { |
| *__result = *__first; |
| ++__result; |
| } |
| } |
| return {std::move(__first), std::move(__result)}; |
| } |
| |
| template <input_iterator _Iter, sentinel_for<_Iter> _Sent, weakly_incrementable _OutIter, class _Proj = identity, |
| indirect_unary_predicate<projected<_Iter, _Proj>> _Pred> |
| requires indirectly_copyable<_Iter, _OutIter> |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| copy_if_result<_Iter, _OutIter> |
| operator()(_Iter __first, _Sent __last, _OutIter __result, _Pred __pred, _Proj __proj = {}) const { |
| return __copy_if_impl(std::move(__first), std::move(__last), std::move(__result), __pred, __proj); |
| } |
| |
| template <input_range _Range, weakly_incrementable _OutIter, class _Proj = identity, |
| indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Pred> |
| requires indirectly_copyable<iterator_t<_Range>, _OutIter> |
| _LIBCPP_HIDE_FROM_ABI constexpr |
| copy_if_result<borrowed_iterator_t<_Range>, _OutIter> |
| operator()(_Range&& __r, _OutIter __result, _Pred __pred, _Proj __proj = {}) const { |
| return __copy_if_impl(ranges::begin(__r), ranges::end(__r), std::move(__result), __pred, __proj); |
| } |
| }; |
| } // namespace __copy_if |
| |
| inline namespace __cpo { |
| inline constexpr auto copy_if = __copy_if::__fn{}; |
| } // namespace __cpo |
| } // namespace ranges |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP_STD_VER > 17 |
| |
| #endif // _LIBCPP___ALGORITHM_RANGES_COPY_IF_H |