| // Copyright (C) 2019-2021 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-options "-std=gnu++2a" } |
| // { dg-do compile { target c++2a } } |
| |
| #include <memory> |
| |
| template<typename T> struct Alloc : std::allocator<T> { }; |
| |
| using T = std::allocator_traits<Alloc<int>>; |
| // Prior to C++20 this finds std::allocator<int>::rebind and so fails: |
| static_assert( std::is_same_v<T::rebind_alloc<long>, Alloc<long>> ); |
| |
| using V = std::allocator_traits<Alloc<void>>; |
| // Prior to C++20 this finds std::allocator<void>::rebind and so fails: |
| static_assert( std::is_same_v<V::rebind_alloc<long>, Alloc<long>> ); |
