1e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 2e78f53d1SNikolas Klauser // 3e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 5e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6e78f53d1SNikolas Klauser // 7e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 8e78f53d1SNikolas Klauser 9*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___ALGORITHM_MERGE_H 10*ce777190SNikolas Klauser #define _LIBCPP___CXX03___ALGORITHM_MERGE_H 11e78f53d1SNikolas Klauser 1273fbae83SNikolas Klauser #include <__cxx03/__algorithm/comp.h> 1373fbae83SNikolas Klauser #include <__cxx03/__algorithm/comp_ref_type.h> 1473fbae83SNikolas Klauser #include <__cxx03/__algorithm/copy.h> 1573fbae83SNikolas Klauser #include <__cxx03/__config> 1673fbae83SNikolas Klauser #include <__cxx03/__iterator/iterator_traits.h> 17e78f53d1SNikolas Klauser 18e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19e78f53d1SNikolas Klauser # pragma GCC system_header 20e78f53d1SNikolas Klauser #endif 21e78f53d1SNikolas Klauser 22e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 23e78f53d1SNikolas Klauser 24e78f53d1SNikolas Klauser template <class _Compare, class _InputIterator1, class _InputIterator2, class _OutputIterator> 25e78f53d1SNikolas Klauser _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator __merge( 26e78f53d1SNikolas Klauser _InputIterator1 __first1, 27e78f53d1SNikolas Klauser _InputIterator1 __last1, 28e78f53d1SNikolas Klauser _InputIterator2 __first2, 29e78f53d1SNikolas Klauser _InputIterator2 __last2, 30e78f53d1SNikolas Klauser _OutputIterator __result, 31e78f53d1SNikolas Klauser _Compare __comp) { 32e78f53d1SNikolas Klauser for (; __first1 != __last1; ++__result) { 33e78f53d1SNikolas Klauser if (__first2 == __last2) 34e78f53d1SNikolas Klauser return std::copy(__first1, __last1, __result); 35e78f53d1SNikolas Klauser if (__comp(*__first2, *__first1)) { 36e78f53d1SNikolas Klauser *__result = *__first2; 37e78f53d1SNikolas Klauser ++__first2; 38e78f53d1SNikolas Klauser } else { 39e78f53d1SNikolas Klauser *__result = *__first1; 40e78f53d1SNikolas Klauser ++__first1; 41e78f53d1SNikolas Klauser } 42e78f53d1SNikolas Klauser } 43e78f53d1SNikolas Klauser return std::copy(__first2, __last2, __result); 44e78f53d1SNikolas Klauser } 45e78f53d1SNikolas Klauser 46e78f53d1SNikolas Klauser template <class _InputIterator1, class _InputIterator2, class _OutputIterator, class _Compare> 47e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 48e78f53d1SNikolas Klauser merge(_InputIterator1 __first1, 49e78f53d1SNikolas Klauser _InputIterator1 __last1, 50e78f53d1SNikolas Klauser _InputIterator2 __first2, 51e78f53d1SNikolas Klauser _InputIterator2 __last2, 52e78f53d1SNikolas Klauser _OutputIterator __result, 53e78f53d1SNikolas Klauser _Compare __comp) { 54e78f53d1SNikolas Klauser return std::__merge<__comp_ref_type<_Compare> >(__first1, __last1, __first2, __last2, __result, __comp); 55e78f53d1SNikolas Klauser } 56e78f53d1SNikolas Klauser 57e78f53d1SNikolas Klauser template <class _InputIterator1, class _InputIterator2, class _OutputIterator> 58e78f53d1SNikolas Klauser inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _OutputIterator 59e78f53d1SNikolas Klauser merge(_InputIterator1 __first1, 60e78f53d1SNikolas Klauser _InputIterator1 __last1, 61e78f53d1SNikolas Klauser _InputIterator2 __first2, 62e78f53d1SNikolas Klauser _InputIterator2 __last2, 63e78f53d1SNikolas Klauser _OutputIterator __result) { 64e78f53d1SNikolas Klauser return std::merge(__first1, __last1, __first2, __last2, __result, __less<>()); 65e78f53d1SNikolas Klauser } 66e78f53d1SNikolas Klauser 67e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 68e78f53d1SNikolas Klauser 69*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___ALGORITHM_MERGE_H 70