| /* Base class of intrusively reference-counted objects. |
| Copyright (C) 2017-2021 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program 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 of the License, or |
| (at your option) any later version. |
| |
| This program 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 program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef COMMON_REFCOUNTED_OBJECT_H |
| #define COMMON_REFCOUNTED_OBJECT_H |
| |
| /* Base class of intrusively reference-countable objects. |
| Incrementing and decrementing the reference count is an external |
| responsibility. */ |
| |
| class refcounted_object |
| { |
| public: |
| refcounted_object () = default; |
| |
| /* Increase the refcount. */ |
| void incref () |
| { |
| gdb_assert (m_refcount >= 0); |
| m_refcount++; |
| } |
| |
| /* Decrease the refcount. */ |
| void decref () |
| { |
| m_refcount--; |
| gdb_assert (m_refcount >= 0); |
| } |
| |
| int refcount () const { return m_refcount; } |
| |
| private: |
| DISABLE_COPY_AND_ASSIGN (refcounted_object); |
| |
| /* The reference count. */ |
| int m_refcount = 0; |
| }; |
| |
| /* A policy class to interface gdb::ref_ptr with a |
| refcounted_object. */ |
| |
| struct refcounted_object_ref_policy |
| { |
| static void incref (refcounted_object *ptr) |
| { |
| ptr->incref (); |
| } |
| |
| static void decref (refcounted_object *ptr) |
| { |
| ptr->decref (); |
| } |
| }; |
| |
| #endif /* COMMON_REFCOUNTED_OBJECT_H */ |