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
28template <class Iter1, class Iter2, class T>
29TEST_CONSTEXPR_CXX20 void
30test(Iter1 first1, Iter1 last1, Iter2 first2, T init, T x)
31{
32 assert(std::inner_product(first1, last1, first2, init) == x);
33}
34
35template <class Iter1, class Iter2>
36TEST_CONSTEXPR_CXX20 void
37test()
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
52TEST_CONSTEXPR_CXX20 bool
53test()
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
88int main(int, char**)
89{
90 test();
91#if TEST_STD_VER > 17
92 static_assert(test());
93#endif
94 return 0;
95}
96

source code of libcxx/test/std/numerics/numeric.ops/inner.product/inner_product.pass.cpp