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
21constexpr 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
42int main(int, char**)
43{
44 test();
45 static_assert(test());
46
47 return 0;
48}
49

source code of libcxx/test/std/ranges/range.utility/range.subrange/lwg3470.pass.cpp