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_TRANSFORM_REDUCE_H
11#define _LIBCPP___NUMERIC_TRANSFORM_REDUCE_H
12
13#include <__config>
14#include <__functional/operations.h>
15#include <__utility/move.h>
16
17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18#  pragma GCC system_header
19#endif
20
21_LIBCPP_PUSH_MACROS
22#include <__undef_macros>
23
24_LIBCPP_BEGIN_NAMESPACE_STD
25
26#if _LIBCPP_STD_VER >= 17
27template <class _InputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
28_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp
29transform_reduce(_InputIterator __first, _InputIterator __last, _Tp __init, _BinaryOp __b, _UnaryOp __u) {
30  for (; __first != __last; ++__first)
31    __init = __b(std::move(__init), __u(*__first));
32  return __init;
33}
34
35template <class _InputIterator1, class _InputIterator2, class _Tp, class _BinaryOp1, class _BinaryOp2>
36_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp transform_reduce(
37    _InputIterator1 __first1,
38    _InputIterator1 __last1,
39    _InputIterator2 __first2,
40    _Tp __init,
41    _BinaryOp1 __b1,
42    _BinaryOp2 __b2) {
43  for (; __first1 != __last1; ++__first1, (void)++__first2)
44    __init = __b1(std::move(__init), __b2(*__first1, *__first2));
45  return __init;
46}
47
48template <class _InputIterator1, class _InputIterator2, class _Tp>
49_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp
50transform_reduce(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _Tp __init) {
51  return std::transform_reduce(__first1, __last1, __first2, std::move(__init), std::plus<>(), std::multiplies<>());
52}
53#endif
54
55_LIBCPP_END_NAMESPACE_STD
56
57_LIBCPP_POP_MACROS
58
59#endif // _LIBCPP___NUMERIC_TRANSFORM_REDUCE_H