| // Copyright (C) 2019-2025 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // { dg-do compile { target c++20 } } |
| |
| #include <concepts> |
| |
| // Default-initialization of const T is only valid for class types that are |
| // const-default-constructible. |
| static_assert( !std::default_initializable<const int> ); |
| static_assert( !std::default_initializable<const int[1]> ); |
| struct A { int i; }; |
| static_assert( !std::default_initializable<const A> ); |
| static_assert( !std::default_initializable<const A[1]> ); |
| struct B { int i; long l; }; |
| static_assert( !std::default_initializable<const B> ); |
| static_assert( !std::default_initializable<const B[1]> ); |
| struct C : A { }; |
| static_assert( !std::default_initializable<const C> ); |
| static_assert( !std::default_initializable<const C[1]> ); |
| struct D { A a; }; |
| static_assert( !std::default_initializable<const D> ); |
| static_assert( !std::default_initializable<const D[1]> ); |
| |
| struct S0 { explicit S0() = default; }; |
| struct S1 { S0 x; }; // Note: aggregate |
| // S1{} would be ill-formed, due to copy-list-initialization of S1::x from {} |
| static_assert( !std::default_initializable<S1> ); |
