| // Copyright (C) 2018-2023 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 run { target c++11 } } |
| // { dg-require-effective-target hosted } |
| |
| #include <functional> |
| |
| // This type is not CopyConstructible because copying a non-const lvalue |
| // will call the throwing constructor. |
| struct A |
| { |
| A() = default; |
| A(const A&) { } // not trivial, so allocated on the heap by std::function |
| A(A&) { throw 1; } |
| void operator()() const { } |
| }; |
| |
| int main() |
| { |
| const A a{}; |
| // Undefined, because std::function requires CopyConstructible: |
| std::function<void()> f(a); |
| // This will throw if the object is copied as non-const: |
| std::function<void()> g(f); |
| } |
