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/* Base class of intrusively reference-counted objects.
Copyright (C) 2017-2023 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 ();
}
};
/* A policy class to interface gdb::ref_ptr with a refcounted_object, that
deletes the object once the refcount reaches 0.. */
template<typename T>
struct refcounted_object_delete_ref_policy
{
static void incref (T *obj)
{ obj->incref (); }
static void decref (T *obj)
{
obj->decref ();
if (obj->refcount () == 0)
delete obj;
}
};
#endif /* COMMON_REFCOUNTED_OBJECT_H */
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