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 // UNSUPPORTED: clang-8
11 // UNSUPPORTED: gcc-9
12
13 // Became constexpr in C++20
14 // template <class ForwardIterator, class T>
15 // void iota(ForwardIterator first, ForwardIterator last, T value);
16
17 #include <numeric>
18 #include <cassert>
19
20 #include "test_macros.h"
21 #include "test_iterators.h"
22
23 template <class InIter>
24 TEST_CONSTEXPR_CXX20 void
test()25 test()
26 {
27 int ia[] = {1, 2, 3, 4, 5};
28 int ir[] = {5, 6, 7, 8, 9};
29 const unsigned s = sizeof(ia) / sizeof(ia[0]);
30 std::iota(InIter(ia), InIter(ia+s), 5);
31 for (unsigned i = 0; i < s; ++i)
32 assert(ia[i] == ir[i]);
33 }
34
35 TEST_CONSTEXPR_CXX20 bool
test()36 test()
37 {
38 test<forward_iterator<int*> >();
39 test<bidirectional_iterator<int*> >();
40 test<random_access_iterator<int*> >();
41 test<int*>();
42
43 return true;
44 }
45
main(int,char **)46 int main(int, char**)
47 {
48 test();
49 #if TEST_STD_VER > 17
50 static_assert(test());
51 #endif
52 return 0;
53 }
54