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
test(Iter1 first1,Iter1 last1,Iter2 first2,T init,T x)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
test()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
test()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
main(int,char **)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