]>
git.ipfire.org Git - thirdparty/gcc.git/blob - libstdc++-v3/testsuite/std/concepts/concepts.lang/concept.defaultinitializable/lwg3149.cc
1 // Copyright (C) 2019-2022 Free Software Foundation, Inc.
3 // This file is part of the GNU ISO C++ Library. This library is free
4 // software; you can redistribute it and/or modify it under the
5 // terms of the GNU General Public License as published by the
6 // Free Software Foundation; either version 3, or (at your option)
9 // This library is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
14 // You should have received a copy of the GNU General Public License along
15 // with this library; see the file COPYING3. If not see
16 // <http://www.gnu.org/licenses/>.
18 // { dg-options "-std=gnu++2a" }
19 // { dg-do compile { target c++2a } }
23 // Default-initialization of const T is only valid for class types that are
24 // const-default-constructible.
25 static_assert( !std::default_initializable
<const int> );
26 static_assert( !std::default_initializable
<const int[1]> );
28 static_assert( !std::default_initializable
<const A
> );
29 static_assert( !std::default_initializable
<const A
[1]> );
30 struct B
{ int i
; long l
; };
31 static_assert( !std::default_initializable
<const B
> );
32 static_assert( !std::default_initializable
<const B
[1]> );
34 static_assert( !std::default_initializable
<const C
> );
35 static_assert( !std::default_initializable
<const C
[1]> );
37 static_assert( !std::default_initializable
<const D
> );
38 static_assert( !std::default_initializable
<const D
[1]> );
40 struct S0
{ explicit S0() = default; };
41 struct S1
{ S0 x
; }; // Note: aggregate
42 // S1{} would be ill-formed, due to copy-list-initialization of S1::x from {}
43 static_assert( !std::default_initializable
<S1
> );