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 <class ForwardIterator, class T>
13 // void iota(ForwardIterator first, ForwardIterator last, T value);
14
15 #include <numeric>
16 #include <cassert>
17
18 #include "test_macros.h"
19 #include "test_iterators.h"
20
21 template <class InIter>
22 TEST_CONSTEXPR_CXX20 void
test()23 test()
24 {
25 int ia[] = {1, 2, 3, 4, 5};
26 int ir[] = {5, 6, 7, 8, 9};
27 const unsigned s = sizeof(ia) / sizeof(ia[0]);
28 std::iota(InIter(ia), InIter(ia+s), 5);
29 for (unsigned i = 0; i < s; ++i)
30 assert(ia[i] == ir[i]);
31 }
32
33 TEST_CONSTEXPR_CXX20 bool
test()34 test()
35 {
36 test<forward_iterator<int*> >();
37 test<bidirectional_iterator<int*> >();
38 test<random_access_iterator<int*> >();
39 test<int*>();
40
41 return true;
42 }
43
main(int,char **)44 int main(int, char**)
45 {
46 test();
47 #if TEST_STD_VER > 17
48 static_assert(test());
49 #endif
50 return 0;
51 }
52