/*
- * DEBUG: section -- Refcount allocator
- * AUTHOR: Robert Collins
- *
- * SQUID Web Proxy Cache http://www.squid-cache.org/
- * ----------------------------------------------------------
- *
- * Squid is the result of efforts by numerous individuals from
- * the Internet community; see the CONTRIBUTORS file for full
- * details. Many organizations have provided support for Squid's
- * development; see the SPONSORS file for full details. Squid is
- * Copyrighted (C) 2001 by the Regents of the University of
- * California; see the COPYRIGHT file for full details. Squid
- * incorporates software developed and/or copyrighted by other
- * sources; see the CREDITS file for full details.
- *
- * 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 2 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
+ * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
*
+ * Squid software is distributed under GPLv2+ license and includes
+ * contributions from numerous individuals and organizations.
+ * Please see the COPYING and CONTRIBUTORS files for details.
*/
+/* DEBUG: section -- Refcount allocator */
+
#ifndef SQUID_REFCOUNT_H_
#define SQUID_REFCOUNT_H_
// reference counting requires the Lock API on base classes
#include "base/Lock.h"
-#if HAVE_IOSTREAM
#include <iostream>
-#endif
/**
* Template for Reference Counting pointers.
*
- * Objects of type 'C' must inherit from 'Lockable' in base/Lock.h
+ * Objects of type 'C' must inherit from 'RefCountable' in base/Lock.h
* which provides the locking interface used by reference counting.
*/
template <class C>
{
public:
- RefCount () : p_ (NULL) {}
+ RefCount () : p_ (nullptr) {}
RefCount (C const *p) : p_(p) { reference (*this); }
reference (p);
}
+ RefCount (RefCount &&p) : p_(std::move(p.p_)) {
+ p.p_=nullptr;
+ }
+
+ /// Base::Pointer = Derived::Pointer
+ template <class Other>
+ RefCount(const RefCount<Other> &p): p_(p.getRaw()) {
+ reference(*this);
+ }
+
RefCount& operator = (const RefCount& p) {
// DO NOT CHANGE THE ORDER HERE!!!
// This preserves semantics on self assignment
return *this;
}
+ RefCount& operator = (RefCount&& p) {
+ if (this != &p) {
+ dereference(p.p_);
+ p.p_ = nullptr;
+ }
+ return *this;
+ }
+
+ explicit operator bool() const { return p_; }
+
bool operator !() const { return !p_; }
C * operator-> () const {return const_cast<C *>(p_); }
- C & operator * () const {return *const_cast<C *>(p_); }
-
- C const * getRaw() const {return p_; }
+ C & operator * () const {
+ assert(p_);
+ return *const_cast<C *>(p_);
+ }
- C * getRaw() {return const_cast<C *>(p_); }
+ C * getRaw() const { return const_cast<C *>(p_); }
bool operator == (const RefCount& p) const {
return p.p_ == p_;
return p.p_ != p_;
}
+ template <class Other>
+ bool operator ==(const Other * const p) const
+ {
+ return p == p_;
+ }
+
+ template <class Other>
+ bool operator !=(const Other * const p) const
+ {
+ return p != p_;
+ }
+
private:
- void dereference(C const *newP = NULL) {
+ void dereference(C const *newP = nullptr) {
/* Setting p_ first is important:
* we may be freed ourselves as a result of
* delete p_;
template <class C>
inline std::ostream &operator <<(std::ostream &os, const RefCount<C> &p)
{
- if (p != NULL)
+ if (p != nullptr)
return os << p.getRaw() << '*' << p->LockCount();
else
return os << "NULL";
}
#endif /* SQUID_REFCOUNT_H_ */
+