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
27template <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
39template <class _InputIterator, class _OutputIterator, class _Predicate>
40inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator
41copy_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