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-has-no-incomplete-ranges
11
12 // template<class... Args>
13 // requires constructible_from<T, Args...>
14 // constexpr explicit single_view(in_place_t, Args&&... args);
15
16 #include <cassert>
17 #include <ranges>
18 #include <utility>
19
20 #include "test_macros.h"
21
22 struct TakesTwoInts {
23 int a_, b_;
TakesTwoIntsTakesTwoInts24 constexpr TakesTwoInts(int a, int b) : a_(a), b_(b) {}
25 };
26
test()27 constexpr bool test() {
28 {
29 std::ranges::single_view<TakesTwoInts> sv(std::in_place, 1, 2);
30 assert(sv.data()->a_ == 1);
31 assert(sv.data()->b_ == 2);
32 assert(sv.size() == 1);
33 }
34 {
35 const std::ranges::single_view<TakesTwoInts> sv(std::in_place, 1, 2);
36 assert(sv.data()->a_ == 1);
37 assert(sv.data()->b_ == 2);
38 assert(sv.size() == 1);
39 }
40
41 return true;
42 }
43
main(int,char **)44 int main(int, char**) {
45 test();
46 static_assert(test());
47
48 return 0;
49 }
50