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 // template <InputIterator Iter, MoveConstructible T,
12 //           Callable<auto, const T&, Iter::reference> BinaryOperation>
13 //   requires HasAssign<T, BinaryOperation::result_type>
14 //         && CopyConstructible<BinaryOperation>
15 //   T
16 //   accumulate(Iter first, Iter last, T init, BinaryOperation binary_op);
17 
18 #include <numeric>
19 #include <functional>
20 #include <cassert>
21 
22 #include "test_macros.h"
23 #include "test_iterators.h"
24 
25 template <class Iter, class T>
26 void
27 test(Iter first, Iter last, T init, T x)
28 {
29     assert(std::accumulate(first, last, init, std::multiplies<T>()) == x);
30 }
31 
32 template <class Iter>
33 void
34 test()
35 {
36     int ia[] = {1, 2, 3, 4, 5, 6};
37     unsigned sa = sizeof(ia) / sizeof(ia[0]);
38     test(Iter(ia), Iter(ia), 1, 1);
39     test(Iter(ia), Iter(ia), 10, 10);
40     test(Iter(ia), Iter(ia+1), 1, 1);
41     test(Iter(ia), Iter(ia+1), 10, 10);
42     test(Iter(ia), Iter(ia+2), 1, 2);
43     test(Iter(ia), Iter(ia+2), 10, 20);
44     test(Iter(ia), Iter(ia+sa), 1, 720);
45     test(Iter(ia), Iter(ia+sa), 10, 7200);
46 }
47 
48 int main(int, char**)
49 {
50     test<input_iterator<const int*> >();
51     test<forward_iterator<const int*> >();
52     test<bidirectional_iterator<const int*> >();
53     test<random_access_iterator<const int*> >();
54     test<const int*>();
55 
56   return 0;
57 }
58