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 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
11
12 // class std::ranges::subrange;
13 // Test the example from LWG 3470,
14 // qualification conversions in __convertible_to_non_slicing
15
16 #include <ranges>
17
18 #include <cassert>
19
20 #include "test_macros.h"
21
test()22 constexpr bool test()
23 {
24 // The example from LWG3470, using implicit conversion.
25 int a[3] = { 1, 2, 3 };
26 int* b[3] = { &a[2], &a[0], &a[1] };
27 std::ranges::subrange<const int* const*> c = b;
28 assert(c.begin() == b + 0);
29 assert(c.end() == b + 3);
30
31 // Also test CTAD and a subrange-to-subrange conversion.
32 std::same_as<std::ranges::subrange<int**>> auto d = std::ranges::subrange(b);
33 assert(d.begin() == b + 0);
34 assert(d.end() == b + 3);
35
36 std::ranges::subrange<const int* const*> e = d;
37 assert(e.begin() == b + 0);
38 assert(e.end() == b + 3);
39
40 return true;
41 }
42
main(int,char **)43 int main(int, char**)
44 {
45 test();
46 static_assert(test());
47
48 return 0;
49 }
50