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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
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+// Copyright (C) 2003 Dominique Devriese <devriese@kde.org>
+
+// 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., 51 Franklin Street, Fifth Floor, Boston, MA
+// 02110-1301, USA.
+
+
+
+// This code comes from the boost::intrusive_ptr. I adapted it to
+// suit my needs ( no dependencies on other boost libs, change the
+// namespace to avoid conflicts,
+
+#ifndef MYBOOST_INTRUSIVE_PTR_HPP_INCLUDED
+#define MYBOOST_INTRUSIVE_PTR_HPP_INCLUDED
+
+//
+// intrusive_ptr.hpp
+//
+// Copyright (c) 2001, 2002 Peter Dimov
+//
+// Permission to copy, use, modify, sell and distribute this software
+// is granted provided this copyright notice appears in all copies.
+// This software is provided "as is" without express or implied
+// warranty, and with no claim as to its suitability for any purpose.
+//
+// See http://www.boost.org/libs/smart_ptr/intrusive_ptr.html for documentation.
+//
+
+#include <functional> // for std::less
+#include <iosfwd> // for std::basic_ostream
+
+
+namespace myboost
+{
+
+//
+// intrusive_ptr
+//
+// A smart pointer that uses intrusive reference counting.
+//
+// Relies on unqualified calls to
+//
+// void intrusive_ptr_add_ref(T * p);
+// void intrusive_ptr_release(T * p);
+//
+// (p != 0)
+//
+// The object is responsible for destroying itself.
+//
+
+template<class T> class intrusive_ptr
+{
+private:
+
+ typedef intrusive_ptr this_type;
+
+public:
+
+ typedef T element_type;
+
+ intrusive_ptr(): p_(0)
+ {
+ }
+
+ intrusive_ptr(T * p, bool add_ref = true): p_(p)
+ {
+ if(p_ != 0 && add_ref) intrusive_ptr_add_ref(p_);
+ }
+
+#if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES)
+
+ template<class U> intrusive_ptr(intrusive_ptr<U> const & rhs): p_(rhs.get())
+ {
+ if(p_ != 0) intrusive_ptr_add_ref(p_);
+ }
+
+#endif
+
+ intrusive_ptr(intrusive_ptr const & rhs): p_(rhs.p_)
+ {
+ if(p_ != 0) intrusive_ptr_add_ref(p_);
+ }
+
+ ~intrusive_ptr()
+ {
+ if(p_ != 0) intrusive_ptr_release(p_);
+ }
+
+#if !defined(BOOST_NO_MEMBER_TEMPLATES) || defined(BOOST_MSVC6_MEMBER_TEMPLATES)
+
+ template<class U> intrusive_ptr & operator=(intrusive_ptr<U> const & rhs)
+ {
+ this_type(rhs).swap(*this);
+ return *this;
+ }
+
+#endif
+
+ intrusive_ptr & operator=(intrusive_ptr const & rhs)
+ {
+ this_type(rhs).swap(*this);
+ return *this;
+ }
+
+ intrusive_ptr & operator=(T * rhs)
+ {
+ this_type(rhs).swap(*this);
+ return *this;
+ }
+
+ T * get() const
+ {
+ return p_;
+ }
+
+ T & operator*() const
+ {
+ return *p_;
+ }
+
+ T * operator->() const
+ {
+ return p_;
+ }
+
+ typedef T * (intrusive_ptr::*unspecified_bool_type) () const;
+
+ operator unspecified_bool_type () const
+ {
+ return p_ == 0? 0: &intrusive_ptr::get;
+ }
+
+ // operator! is a Borland-specific workaround
+ bool operator! () const
+ {
+ return p_ == 0;
+ }
+
+ void swap(intrusive_ptr & rhs)
+ {
+ T * tmp = p_;
+ p_ = rhs.p_;
+ rhs.p_ = tmp;
+ }
+
+private:
+
+ T * p_;
+};
+
+template<class T, class U> inline bool operator==(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b)
+{
+ return a.get() == b.get();
+}
+
+template<class T, class U> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<U> const & b)
+{
+ return a.get() != b.get();
+}
+
+template<class T> inline bool operator==(intrusive_ptr<T> const & a, T * b)
+{
+ return a.get() == b;
+}
+
+template<class T> inline bool operator!=(intrusive_ptr<T> const & a, T * b)
+{
+ return a.get() != b;
+}
+
+template<class T> inline bool operator==(T * a, intrusive_ptr<T> const & b)
+{
+ return a == b.get();
+}
+
+template<class T> inline bool operator!=(T * a, intrusive_ptr<T> const & b)
+{
+ return a != b.get();
+}
+
+#if __GNUC__ == 2 && __GNUC_MINOR__ <= 96
+
+// Resolve the ambiguity between our op!= and the one in rel_ops
+
+template<class T> inline bool operator!=(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b)
+{
+ return a.get() != b.get();
+}
+
+#endif
+
+template<class T> inline bool operator<(intrusive_ptr<T> const & a, intrusive_ptr<T> const & b)
+{
+ return std::less<T *>()(a.get(), b.get());
+}
+
+template<class T> void swap(intrusive_ptr<T> & lhs, intrusive_ptr<T> & rhs)
+{
+ lhs.swap(rhs);
+}
+
+// mem_fn support
+
+template<class T> T * get_pointer(intrusive_ptr<T> const & p)
+{
+ return p.get();
+}
+
+template<class T, class U> intrusive_ptr<T> static_pointer_cast(intrusive_ptr<U> const & p)
+{
+ return static_cast<T *>(p.get());
+}
+
+template<class T, class U> intrusive_ptr<T> dynamic_pointer_cast(intrusive_ptr<U> const & p)
+{
+ return dynamic_cast<T *>(p.get());
+}
+
+// operator<<
+
+#if defined(__GNUC__) && (__GNUC__ < 3)
+
+template<class Y> std::ostream & operator<< (std::ostream & os, intrusive_ptr<Y> const & p)
+{
+ os << p.get();
+ return os;
+}
+
+#else
+
+template<class E, class T, class Y> std::basic_ostream<E, T> & operator<< (std::basic_ostream<E, T> & os, intrusive_ptr<Y> const & p)
+{
+ os << p.get();
+ return os;
+}
+
+#endif
+
+} // namespace myboost
+
+#ifdef BOOST_MSVC
+# pragma warning(pop)
+#endif
+
+#endif // #ifndef MYBOOST_INTRUSIVE_PTR_HPP_INCLUDED