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 Iter, MoveConstructible T>
13// requires HasPlus<T, Iter::reference>
14// && HasAssign<T, HasPlus<T, Iter::reference>::result_type>
15// T
16// accumulate(Iter first, Iter last, T init);
17
18#include <numeric>
19#include <cassert>
20
21#include "test_macros.h"
22#include "test_iterators.h"
23
24template <class Iter, class T>
25TEST_CONSTEXPR_CXX20 void
26test(Iter first, Iter last, T init, T x)
27{
28 assert(std::accumulate(first, last, init) == x);
29}
30
31template <class Iter>
32TEST_CONSTEXPR_CXX20 void
33test()
34{
35 int ia[] = {1, 2, 3, 4, 5, 6};
36 unsigned sa = sizeof(ia) / sizeof(ia[0]);
37 test(Iter(ia), Iter(ia), 0, 0);
38 test(Iter(ia), Iter(ia), 10, 10);
39 test(Iter(ia), Iter(ia+1), 0, 1);
40 test(Iter(ia), Iter(ia+1), 10, 11);
41 test(Iter(ia), Iter(ia+2), 0, 3);
42 test(Iter(ia), Iter(ia+2), 10, 13);
43 test(Iter(ia), Iter(ia+sa), 0, 21);
44 test(Iter(ia), Iter(ia+sa), 10, 31);
45}
46
47TEST_CONSTEXPR_CXX20 bool
48test()
49{
50 test<cpp17_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 true;
57}
58
59int main(int, char**)
60{
61 test();
62#if TEST_STD_VER > 17
63 static_assert(test());
64#endif
65 return 0;
66}
67

source code of libcxx/test/std/numerics/numeric.ops/accumulate/accumulate.pass.cpp