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_BEGIN_NAMESPACE_STD
22 
23 #if _LIBCPP_STD_VER > 14
24 template <class _InputIterator, class _Tp, class _BinaryOp, class _UnaryOp>
25 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _Tp transform_reduce(_InputIterator __first,
26                                                                              _InputIterator __last, _Tp __init,
27                                                                              _BinaryOp __b, _UnaryOp __u) {
28   for (; __first != __last; ++__first)
29     __init = __b(__init, __u(*__first));
30   return __init;
31 }
32 
33 template <class _InputIterator1, class _InputIterator2, class _Tp, class _BinaryOp1, class _BinaryOp2>
34 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _Tp transform_reduce(_InputIterator1 __first1,
35                                                                              _InputIterator1 __last1,
36                                                                              _InputIterator2 __first2, _Tp __init,
37                                                                              _BinaryOp1 __b1, _BinaryOp2 __b2) {
38   for (; __first1 != __last1; ++__first1, (void)++__first2)
39     __init = __b1(__init, __b2(*__first1, *__first2));
40   return __init;
41 }
42 
43 template <class _InputIterator1, class _InputIterator2, class _Tp>
44 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 _Tp transform_reduce(_InputIterator1 __first1,
45                                                                              _InputIterator1 __last1,
46                                                                              _InputIterator2 __first2, _Tp __init) {
47   return _VSTD::transform_reduce(__first1, __last1, __first2, _VSTD::move(__init), _VSTD::plus<>(),
48                                  _VSTD::multiplies<>());
49 }
50 #endif
51 
52 _LIBCPP_END_NAMESPACE_STD
53 
54 #endif // _LIBCPP___NUMERIC_TRANSFORM_REDUCE_H
55