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#if _LIBCPP_STD_VER >= 17
26
27_LIBCPP_BEGIN_NAMESPACE_STD
28
29template <class _InputIterator, class _Tp, class _BinaryOp>
30[[nodiscard]] _LIBCPP_HIDE_FROM_ABI
31_LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp reduce(_InputIterator __first, _InputIterator __last, _Tp __init, _BinaryOp __b) {
32 for (; __first != __last; ++__first)
33 __init = __b(std::move(__init), *__first);
34 return __init;
35}
36
37template <class _InputIterator, class _Tp>
38[[nodiscard]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp
39reduce(_InputIterator __first, _InputIterator __last, _Tp __init) {
40 return std::reduce(__first, __last, __init, std::plus<>());
41}
42
43template <class _InputIterator>
44[[nodiscard]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 typename iterator_traits<_InputIterator>::value_type
45reduce(_InputIterator __first, _InputIterator __last) {
46 return std::reduce(__first, __last, typename iterator_traits<_InputIterator>::value_type{});
47}
48
49_LIBCPP_END_NAMESPACE_STD
50
51#endif // _LIBCPP_STD_VER >= 17
52
53_LIBCPP_POP_MACROS
54
55#endif // _LIBCPP___NUMERIC_REDUCE_H
56