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-no-concepts
11 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
12 
13 // class std::ranges::subrange;
14 
15 #include <ranges>
16 
17 #include <cassert>
18 #include "test_macros.h"
19 #include "test_iterators.h"
20 #include "types.h"
21 
22 constexpr bool test() {
23   std::ranges::subrange<MoveOnlyForwardIter, int*> a(MoveOnlyForwardIter(globalBuff), globalBuff + 8, 8);
24   assert(a.begin().base == globalBuff);
25   assert(!a.empty());
26   assert(a.size() == 8);
27 
28   std::ranges::subrange<ForwardIter> b(ForwardIter(nullptr), ForwardIter(nullptr));
29   assert(b.empty());
30 
31   std::ranges::subrange<ForwardIter> c{ForwardIter(globalBuff), ForwardIter(globalBuff)};
32   assert(c.empty());
33 
34   std::ranges::subrange<ForwardIter> d(ForwardIter(globalBuff), ForwardIter(globalBuff + 1));
35   assert(!d.empty());
36 
37   std::ranges::subrange<SizedSentinelForwardIter> e(SizedSentinelForwardIter(globalBuff),
38                                                     SizedSentinelForwardIter(globalBuff + 8), 8);
39   assert(!e.empty());
40   assert(e.size() == 8);
41 
42   // Make sure that operator- is used to calculate size when possible.
43   if (!std::is_constant_evaluated())
44     assert(SizedSentinelForwardIter::minusCount == 1);
45 
46   return true;
47 }
48 
49 
50 int main(int, char**) {
51   test();
52   static_assert(test());
53 
54   return 0;
55 }
56