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
13 #include <ranges>
14
15 #include <cassert>
16 #include "test_iterators.h"
17 #include "types.h"
18
test()19 constexpr bool test() {
20 int buff[] = {1, 2, 3, 4, 5};
21
22 {
23 std::ranges::subrange<MoveOnlyForwardIter, int*> a(MoveOnlyForwardIter(buff), buff + 5, 5);
24 assert(base(a.begin()) == buff);
25 assert(!a.empty());
26 assert(a.size() == 5);
27 }
28
29 {
30 std::ranges::subrange<ForwardIter> b(ForwardIter(nullptr), ForwardIter(nullptr));
31 assert(b.empty());
32 }
33
34 {
35 std::ranges::subrange<ForwardIter> c{ForwardIter(buff), ForwardIter(buff)};
36 assert(c.empty());
37 }
38
39 {
40 std::ranges::subrange<ForwardIter> d(ForwardIter(buff), ForwardIter(buff + 1));
41 assert(!d.empty());
42 }
43
44 {
45 bool minusWasCalled = false;
46 SizedSentinelForwardIter beg(buff, &minusWasCalled), end(buff + 5, &minusWasCalled);
47 std::ranges::subrange<SizedSentinelForwardIter> e(beg, end, 5);
48 assert(!e.empty());
49
50 // Make sure that operator- is used to calculate size when possible.
51 minusWasCalled = false;
52 assert(e.size() == 5);
53 assert(minusWasCalled);
54 }
55
56 return true;
57 }
58
59
main(int,char **)60 int main(int, char**) {
61 test();
62 static_assert(test());
63
64 return 0;
65 }
66