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 // UNSUPPORTED: c++03, c++11, c++14, c++17
10
11 // class std::ranges::subrange;
12 // Test the example from LWG 3470,
13 // qualification conversions in __convertible_to_non_slicing
14
15 #include <ranges>
16
17 #include <cassert>
18
19 #include "test_macros.h"
20
test()21 constexpr bool test()
22 {
23 // The example from LWG3470, using implicit conversion.
24 int a[3] = { 1, 2, 3 };
25 int* b[3] = { &a[2], &a[0], &a[1] };
26 std::ranges::subrange<const int* const*> c = b;
27 assert(c.begin() == b + 0);
28 assert(c.end() == b + 3);
29
30 // Also test CTAD and a subrange-to-subrange conversion.
31 std::same_as<std::ranges::subrange<int**>> auto d = std::ranges::subrange(b);
32 assert(d.begin() == b + 0);
33 assert(d.end() == b + 3);
34
35 std::ranges::subrange<const int* const*> e = d;
36 assert(e.begin() == b + 0);
37 assert(e.end() == b + 3);
38
39 return true;
40 }
41
main(int,char **)42 int main(int, char**)
43 {
44 test();
45 static_assert(test());
46
47 return 0;
48 }
49