1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___NUMERIC_REDUCE_H 11 #define _LIBCPP___NUMERIC_REDUCE_H 12 13 #include <__config> 14 #include <__functional/operations.h> 15 #include <__iterator/iterator_traits.h> 16 #include <__utility/move.h> 17 18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 19 # pragma GCC system_header 20 #endif 21 22 _LIBCPP_BEGIN_NAMESPACE_STD 23 24 #if _LIBCPP_STD_VER >= 17 25 template <class _InputIterator, class _Tp, class _BinaryOp> 26 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp 27 reduce(_InputIterator __first, _InputIterator __last, _Tp __init, _BinaryOp __b) { 28 for (; __first != __last; ++__first) 29 __init = __b(std::move(__init), *__first); 30 return __init; 31 } 32 33 template <class _InputIterator, class _Tp> 34 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp 35 reduce(_InputIterator __first, _InputIterator __last, _Tp __init) { 36 return std::reduce(__first, __last, __init, std::plus<>()); 37 } 38 39 template <class _InputIterator> 40 _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 typename iterator_traits<_InputIterator>::value_type 41 reduce(_InputIterator __first, _InputIterator __last) { 42 return std::reduce(__first, __last, typename iterator_traits<_InputIterator>::value_type{}); 43 } 44 #endif 45 46 _LIBCPP_END_NAMESPACE_STD 47 48 #endif // _LIBCPP___NUMERIC_REDUCE_H 49