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
19constexpr 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
60int main(int, char**) {
61 test();
62 static_assert(test());
63
64 return 0;
65}
66

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