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_INNER_PRODUCT_H
11 #define _LIBCPP___NUMERIC_INNER_PRODUCT_H
12 
13 #include <__config>
14 #include <__utility/move.h>
15 
16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17 #  pragma GCC system_header
18 #endif
19 
20 _LIBCPP_PUSH_MACROS
21 #include <__undef_macros>
22 
23 _LIBCPP_BEGIN_NAMESPACE_STD
24 
25 template <class _InputIterator1, class _InputIterator2, class _Tp>
26 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
27 _Tp
28 inner_product(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2, _Tp __init)
29 {
30     for (; __first1 != __last1; ++__first1, (void) ++__first2)
31 #if _LIBCPP_STD_VER >= 20
32         __init = _VSTD::move(__init) + *__first1 * *__first2;
33 #else
34         __init = __init + *__first1 * *__first2;
35 #endif
36     return __init;
37 }
38 
39 template <class _InputIterator1, class _InputIterator2, class _Tp, class _BinaryOperation1, class _BinaryOperation2>
40 _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
41 _Tp
42 inner_product(_InputIterator1 __first1, _InputIterator1 __last1, _InputIterator2 __first2,
43               _Tp __init, _BinaryOperation1 __binary_op1, _BinaryOperation2 __binary_op2)
44 {
45     for (; __first1 != __last1; ++__first1, (void) ++__first2)
46 #if _LIBCPP_STD_VER >= 20
47         __init = __binary_op1(_VSTD::move(__init), __binary_op2(*__first1, *__first2));
48 #else
49         __init = __binary_op1(__init, __binary_op2(*__first1, *__first2));
50 #endif
51     return __init;
52 }
53 
54 _LIBCPP_END_NAMESPACE_STD
55 
56 _LIBCPP_POP_MACROS
57 
58 #endif // _LIBCPP___NUMERIC_INNER_PRODUCT_H
59