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 InIter, OutputIterator<auto, const InIter::value_type&> OutIter>
13// requires HasPlus<InIter::value_type, InIter::reference>
14// && HasAssign<InIter::value_type,
15// HasPlus<InIter::value_type, InIter::reference>::result_type>
16// && Constructible<InIter::value_type, InIter::reference>
17// OutIter
18// partial_sum(InIter first, InIter last, OutIter result);
19
20#include <numeric>
21#include <cassert>
22
23#include "test_macros.h"
24#include "test_iterators.h"
25
26template <class InIter, class OutIter>
27TEST_CONSTEXPR_CXX20 void
28test()
29{
30 int ia[] = {1, 2, 3, 4, 5};
31 int ir[] = {1, 3, 6, 10, 15};
32 const unsigned s = sizeof(ia) / sizeof(ia[0]);
33 int ib[s] = {0};
34 OutIter r = std::partial_sum(InIter(ia), InIter(ia+s), OutIter(ib));
35 assert(base(r) == ib + s);
36 for (unsigned i = 0; i < s; ++i)
37 assert(ib[i] == ir[i]);
38}
39
40TEST_CONSTEXPR_CXX20 bool
41test()
42{
43 test<cpp17_input_iterator<const int*>, cpp17_output_iterator<int*> >();
44 test<cpp17_input_iterator<const int*>, forward_iterator<int*> >();
45 test<cpp17_input_iterator<const int*>, bidirectional_iterator<int*> >();
46 test<cpp17_input_iterator<const int*>, random_access_iterator<int*> >();
47 test<cpp17_input_iterator<const int*>, int*>();
48
49 test<forward_iterator<const int*>, cpp17_output_iterator<int*> >();
50 test<forward_iterator<const int*>, forward_iterator<int*> >();
51 test<forward_iterator<const int*>, bidirectional_iterator<int*> >();
52 test<forward_iterator<const int*>, random_access_iterator<int*> >();
53 test<forward_iterator<const int*>, int*>();
54
55 test<bidirectional_iterator<const int*>, cpp17_output_iterator<int*> >();
56 test<bidirectional_iterator<const int*>, forward_iterator<int*> >();
57 test<bidirectional_iterator<const int*>, bidirectional_iterator<int*> >();
58 test<bidirectional_iterator<const int*>, random_access_iterator<int*> >();
59 test<bidirectional_iterator<const int*>, int*>();
60
61 test<random_access_iterator<const int*>, cpp17_output_iterator<int*> >();
62 test<random_access_iterator<const int*>, forward_iterator<int*> >();
63 test<random_access_iterator<const int*>, bidirectional_iterator<int*> >();
64 test<random_access_iterator<const int*>, random_access_iterator<int*> >();
65 test<random_access_iterator<const int*>, int*>();
66
67 test<const int*, cpp17_output_iterator<int*> >();
68 test<const int*, forward_iterator<int*> >();
69 test<const int*, bidirectional_iterator<int*> >();
70 test<const int*, random_access_iterator<int*> >();
71 test<const int*, int*>();
72
73 return true;
74}
75
76int main(int, char**)
77{
78 test();
79#if TEST_STD_VER > 17
80 static_assert(test());
81#endif
82 return 0;
83}
84

source code of libcxx/test/std/numerics/numeric.ops/partial.sum/partial_sum.pass.cpp