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_PUSH_MACROS
23#include <__undef_macros>
24
25_LIBCPP_BEGIN_NAMESPACE_STD
26
27#if _LIBCPP_STD_VER >= 17
28template <class _InputIterator, class _Tp, class _BinaryOp>
29_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp
30reduce(_InputIterator __first, _InputIterator __last, _Tp __init, _BinaryOp __b) {
31 for (; __first != __last; ++__first)
32 __init = __b(std::move(__init), *__first);
33 return __init;
34}
35
36template <class _InputIterator, class _Tp>
37_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp
38reduce(_InputIterator __first, _InputIterator __last, _Tp __init) {
39 return std::reduce(__first, __last, __init, std::plus<>());
40}
41
42template <class _InputIterator>
43_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 typename iterator_traits<_InputIterator>::value_type
44reduce(_InputIterator __first, _InputIterator __last) {
45 return std::reduce(__first, __last, typename iterator_traits<_InputIterator>::value_type{});
46}
47#endif
48
49_LIBCPP_END_NAMESPACE_STD
50
51_LIBCPP_POP_MACROS
52
53#endif // _LIBCPP___NUMERIC_REDUCE_H
54