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 // constexpr take_view(V base, range_difference_t<V> count); // explicit since C++23
12
13 #include <cassert>
14 #include <ranges>
15
16 #include "test_convertible.h"
17 #include "test_iterators.h"
18 #include "test_macros.h"
19 #include "test_range.h"
20 #include "types.h"
21
22 // SFINAE tests.
23
24 #if TEST_STD_VER >= 23
25
26 static_assert(!test_convertible<std::ranges::take_view<View>, View, std::ranges::range_difference_t<View>>(),
27 "This constructor must be explicit");
28
29 #else
30
31 static_assert(test_convertible<std::ranges::take_view<View>, View, std::ranges::range_difference_t<View>>(),
32 "This constructor must be explicit");
33
34 #endif // TEST_STD_VER >= 23
35
test()36 constexpr bool test() {
37 int buffer[8] = {1, 2, 3, 4, 5, 6, 7, 8};
38
39 {
40 std::ranges::take_view<CopyableView> tv(CopyableView{buffer}, 0);
41 assert(tv.base().ptr_ == buffer);
42 assert(tv.begin() == tv.end()); // Checking we have correct size.
43 }
44
45 {
46 std::ranges::take_view<MoveOnlyView> tv(MoveOnlyView{buffer}, 1);
47 assert(std::move(tv).base().ptr_ == buffer);
48 assert(std::ranges::next(tv.begin(), 1) == tv.end()); // Checking we have correct size.
49 }
50
51 {
52 const std::ranges::take_view<CopyableView> tv(CopyableView{buffer}, 2);
53 assert(tv.base().ptr_ == buffer);
54 assert(std::ranges::next(tv.begin(), 2) == tv.end()); // Checking we have correct size.
55 }
56
57 return true;
58 }
59
main(int,char **)60 int main(int, char**) {
61 test();
62 static_assert(test());
63
64 return 0;
65 }
66