1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: !c++experimental
// join_view() requires default_initializable<V> = default;
#include <cassert>
#include <ranges>
#include "types.h"
struct DefaultView : std::ranges::view_base {
int i; // deliberately uninitialised
ChildView* begin() const;
ChildView* end() const;
};
constexpr bool test() {
{
std::ranges::join_view<ParentView<ChildView>> jv;
assert(std::move(jv).base().ptr_ == globalChildren);
}
// Default constructor should value initialise underlying view
{
std::ranges::join_view<DefaultView> jv;
assert(jv.base().i == 0);
}
static_assert( std::default_initializable<std::ranges::join_view<ParentView<ChildView>>>);
static_assert(!std::default_initializable<std::ranges::join_view<CopyableParent>>);
return true;
}
int main(int, char**) {
test();
static_assert(test());
return 0;
}
|
