1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <numeric>
// UNSUPPORTED: clang-8
// Became constexpr in C++20
// template <InputIterator Iter, MoveConstructible T>
// requires HasPlus<T, Iter::reference>
// && HasAssign<T, HasPlus<T, Iter::reference>::result_type>
// T
// accumulate(Iter first, Iter last, T init);
#include <numeric>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
template <class Iter, class T>
TEST_CONSTEXPR_CXX20 void
test(Iter first, Iter last, T init, T x)
{
assert(std::accumulate(first, last, init) == x);
}
template <class Iter>
TEST_CONSTEXPR_CXX20 void
test()
{
int ia[] = {1, 2, 3, 4, 5, 6};
unsigned sa = sizeof(ia) / sizeof(ia[0]);
test(Iter(ia), Iter(ia), 0, 0);
test(Iter(ia), Iter(ia), 10, 10);
test(Iter(ia), Iter(ia+1), 0, 1);
test(Iter(ia), Iter(ia+1), 10, 11);
test(Iter(ia), Iter(ia+2), 0, 3);
test(Iter(ia), Iter(ia+2), 10, 13);
test(Iter(ia), Iter(ia+sa), 0, 21);
test(Iter(ia), Iter(ia+sa), 10, 31);
}
TEST_CONSTEXPR_CXX20 bool
test()
{
test<input_iterator<const int*> >();
test<forward_iterator<const int*> >();
test<bidirectional_iterator<const int*> >();
test<random_access_iterator<const int*> >();
test<const int*>();
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
|
