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 drop_view(V base, range_difference_t<V> count); // explicit since C++23
12
13#include <ranges>
14
15#include "test_convertible.h"
16#include "test_macros.h"
17#include "types.h"
18
19// SFINAE tests.
20
21#if TEST_STD_VER >= 23
22
23static_assert(!test_convertible<std::ranges::drop_view<View>, View, std::ranges::range_difference_t<View>>(),
24 "This constructor must be explicit");
25
26#else
27
28static_assert(test_convertible<std::ranges::drop_view<View>, View, std::ranges::range_difference_t<View>>(),
29 "This constructor must not be explicit");
30
31#endif // TEST_STD_VER >= 23
32
33constexpr bool test() {
34 std::ranges::drop_view dropView1(MoveOnlyView(), 4);
35 assert(dropView1.size() == 4);
36 assert(dropView1.begin() == globalBuff + 4);
37
38 std::ranges::drop_view dropView2(ForwardView(), 4);
39 assert(base(dropView2.begin()) == globalBuff + 4);
40
41 return true;
42}
43
44int main(int, char**) {
45 test();
46 static_assert(test());
47
48 return 0;
49}
50

source code of libcxx/test/std/ranges/range.adaptors/range.drop/ctor.view.pass.cpp