1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 // <numeric>
10 
11 // Became constexpr in C++20
12 // template <InputIterator Iter1, InputIterator Iter2, MoveConstructible T>
13 //   requires HasMultiply<Iter1::reference, Iter2::reference>
14 //         && HasPlus<T, HasMultiply<Iter1::reference, Iter2::reference>::result_type>
15 //         && HasAssign<T,
16 //                      HasPlus<T,
17 //                              HasMultiply<Iter1::reference,
18 //                                          Iter2::reference>::result_type>::result_type>
19 //   T
20 //   inner_product(Iter1 first1, Iter1 last1, Iter2 first2, T init);
21 
22 #include <numeric>
23 #include <cassert>
24 
25 #include "test_macros.h"
26 #include "test_iterators.h"
27 
28 template <class Iter1, class Iter2, class T>
29 TEST_CONSTEXPR_CXX20 void
30 test(Iter1 first1, Iter1 last1, Iter2 first2, T init, T x)
31 {
32     assert(std::inner_product(first1, last1, first2, init) == x);
33 }
34 
35 template <class Iter1, class Iter2>
36 TEST_CONSTEXPR_CXX20 void
37 test()
38 {
39     int a[] = {1, 2, 3, 4, 5, 6};
40     int b[] = {6, 5, 4, 3, 2, 1};
41     unsigned sa = sizeof(a) / sizeof(a[0]);
42     test(Iter1(a), Iter1(a), Iter2(b), 0, 0);
43     test(Iter1(a), Iter1(a), Iter2(b), 10, 10);
44     test(Iter1(a), Iter1(a+1), Iter2(b), 0, 6);
45     test(Iter1(a), Iter1(a+1), Iter2(b), 10, 16);
46     test(Iter1(a), Iter1(a+2), Iter2(b), 0, 16);
47     test(Iter1(a), Iter1(a+2), Iter2(b), 10, 26);
48     test(Iter1(a), Iter1(a+sa), Iter2(b), 0, 56);
49     test(Iter1(a), Iter1(a+sa), Iter2(b), 10, 66);
50 }
51 
52 TEST_CONSTEXPR_CXX20 bool
53 test()
54 {
55     test<cpp17_input_iterator<const int*>, cpp17_input_iterator<const int*> >();
56     test<cpp17_input_iterator<const int*>, forward_iterator<const int*> >();
57     test<cpp17_input_iterator<const int*>, bidirectional_iterator<const int*> >();
58     test<cpp17_input_iterator<const int*>, random_access_iterator<const int*> >();
59     test<cpp17_input_iterator<const int*>, const int*>();
60 
61     test<forward_iterator<const int*>, cpp17_input_iterator<const int*> >();
62     test<forward_iterator<const int*>, forward_iterator<const int*> >();
63     test<forward_iterator<const int*>, bidirectional_iterator<const int*> >();
64     test<forward_iterator<const int*>, random_access_iterator<const int*> >();
65     test<forward_iterator<const int*>, const int*>();
66 
67     test<bidirectional_iterator<const int*>, cpp17_input_iterator<const int*> >();
68     test<bidirectional_iterator<const int*>, forward_iterator<const int*> >();
69     test<bidirectional_iterator<const int*>, bidirectional_iterator<const int*> >();
70     test<bidirectional_iterator<const int*>, random_access_iterator<const int*> >();
71     test<bidirectional_iterator<const int*>, const int*>();
72 
73     test<random_access_iterator<const int*>, cpp17_input_iterator<const int*> >();
74     test<random_access_iterator<const int*>, forward_iterator<const int*> >();
75     test<random_access_iterator<const int*>, bidirectional_iterator<const int*> >();
76     test<random_access_iterator<const int*>, random_access_iterator<const int*> >();
77     test<random_access_iterator<const int*>, const int*>();
78 
79     test<const int*, cpp17_input_iterator<const int*> >();
80     test<const int*, forward_iterator<const int*> >();
81     test<const int*, bidirectional_iterator<const int*> >();
82     test<const int*, random_access_iterator<const int*> >();
83     test<const int*, const int*>();
84 
85     return true;
86 }
87 
88 int main(int, char**)
89 {
90     test();
91 #if TEST_STD_VER > 17
92     static_assert(test());
93 #endif
94     return 0;
95 }
96