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_COPY_IF_H 10 #define _LIBCPP___ALGORITHM_COPY_IF_H 11 12 #include <__config> 13 #include <__functional/identity.h> 14 #include <__type_traits/invoke.h> 15 #include <__utility/move.h> 16 #include <__utility/pair.h> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 #endif 21 22 _LIBCPP_PUSH_MACROS 23 #include <__undef_macros> 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 template <class _InIter, class _Sent, class _OutIter, class _Proj, class _Pred> 28 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 pair<_InIter, _OutIter> 29 __copy_if(_InIter __first, _Sent __last, _OutIter __result, _Pred& __pred, _Proj& __proj) { 30 for (; __first != __last; ++__first) { 31 if (std::__invoke(__pred, std::__invoke(__proj, *__first))) { 32 *__result = *__first; 33 ++__result; 34 } 35 } 36 return std::make_pair(std::move(__first), std::move(__result)); 37 } 38 39 template <class _InputIterator, class _OutputIterator, class _Predicate> 40 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 41 copy_if(_InputIterator __first, _InputIterator __last, _OutputIterator __result, _Predicate __pred) { 42 __identity __proj; 43 return std::__copy_if(__first, __last, __result, __pred, __proj).second; 44 } 45 46 _LIBCPP_END_NAMESPACE_STD 47 48 _LIBCPP_POP_MACROS 49 50 #endif // _LIBCPP___ALGORITHM_COPY_IF_H 51