// shared_ptr.hpp
//
// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999.
-// Copyright (c) 2001, 2002 Peter Dimov
+// Copyright (c) 2001-2008 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.
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/smart_ptr/shared_ptr.htm for documentation.
//
-#include <boost/config.hpp> // for broken compiler workarounds
-
-#ifndef BOOST_MSVC6_MEMBER_TEMPLATES
-#include <boost/detail/shared_ptr_nmt.hpp>
-#else
-
-#include <boost/assert.hpp>
-#include <boost/checked_delete.hpp>
-
-#include <boost/detail/shared_count.hpp>
-
-#include <memory> // for std::auto_ptr
-#include <algorithm> // for std::swap
-#include <functional> // for std::less
-#include <typeinfo> // for std::bad_cast
-
-#ifdef BOOST_MSVC // moved here to work around VC++ compiler crash
-# pragma warning(push)
-# pragma warning(disable:4284) // odd return type for operator->
-#endif
-
-namespace boost
-{
-
-namespace detail
-{
-
-struct static_cast_tag {};
-struct dynamic_cast_tag {};
-struct polymorphic_cast_tag {};
-
-template<typename T> struct shared_ptr_traits
-{
- typedef T & reference;
-};
-
-template<> struct shared_ptr_traits<void>
-{
- typedef void reference;
-};
-
-} // namespace detail
-
-
-//
-// shared_ptr
-//
-// An enhanced relative of scoped_ptr with reference counted copy semantics.
-// The object pointed to is deleted when the last shared_ptr pointing to it
-// is destroyed or reset.
-//
-
-template<typename T> class weak_ptr;
-template<typename T> class intrusive_ptr;
-
-template<typename T> class shared_ptr
-{
-private:
-
- // Borland 5.5.1 specific workarounds
-// typedef checked_deleter<T> deleter;
- typedef shared_ptr<T> this_type;
-
-public:
-
- typedef T element_type;
-
- shared_ptr(): px(0), pn()
- {
- }
-
- template<typename Y>
- explicit shared_ptr(Y * p): px(p), pn(p, checked_deleter<Y>(), p) // Y must be complete
- {
- }
-
- //
- // Requirements: D's copy constructor must not throw
- //
- // shared_ptr will release p by calling d(p)
- //
-
- template<typename Y, typename D> shared_ptr(Y * p, D d): px(p), pn(p, d)
- {
- }
-
-// generated copy constructor, assignment, destructor are fine
-
- template<typename Y>
- explicit shared_ptr(weak_ptr<Y> const & r): px(r.px), pn(r.pn) // may throw
- {
- }
-
- template<typename Y>
- shared_ptr(shared_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws
- {
- }
-
- template<typename Y>
- shared_ptr(intrusive_ptr<Y> const & r): px(r.get()), pn(r.get()) // never throws
- {
- }
-
- template<typename Y>
- shared_ptr(shared_ptr<Y> const & r, detail::static_cast_tag): px(static_cast<element_type *>(r.px)), pn(r.pn)
- {
- }
-
- template<typename Y>
- shared_ptr(shared_ptr<Y> const & r, detail::dynamic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
- {
- if (px == 0) // need to allocate new counter -- the cast failed
- {
- pn = detail::shared_count();
- }
- }
-
- template<typename Y>
- shared_ptr(shared_ptr<Y> const & r, detail::polymorphic_cast_tag): px(dynamic_cast<element_type *>(r.px)), pn(r.pn)
- {
- if (px == 0)
- {
- throw std::bad_cast();
- }
- }
-
-#ifndef BOOST_NO_AUTO_PTR
-
- template<typename Y>
- explicit shared_ptr(std::auto_ptr<Y> & r): px(r.get()), pn(r)
- {
- }
-
-#endif
-
-#if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200)
-
- template<typename Y>
- shared_ptr & operator=(shared_ptr<Y> const & r) // never throws
- {
- px = r.px;
- pn = r.pn; // shared_count::op= doesn't throw
- return *this;
- }
-
-#endif
-
-#ifndef BOOST_NO_AUTO_PTR
-
- template<typename Y>
- shared_ptr & operator=(std::auto_ptr<Y> & r)
- {
- this_type(r).swap(*this);
- return *this;
- }
-
-#endif
-
- void reset()
- {
- this_type().swap(*this);
- }
-
- template<typename Y> void reset(Y * p) // Y must be complete
- {
- BOOST_ASSERT(p == 0 || p != px); // catch self-reset errors
- this_type(p).swap(*this);
- }
-
- template<typename Y, typename D> void reset(Y * p, D d)
- {
- this_type(p, d).swap(*this);
- }
-
- typename detail::shared_ptr_traits<T>::reference operator* () const // never throws
- {
- BOOST_ASSERT(px != 0);
- return *px;
- }
-
- T * operator-> () const // never throws
- {
- BOOST_ASSERT(px != 0);
- return px;
- }
-
- T * get() const // never throws
- {
- return px;
- }
-
- bool unique() const // never throws
- {
- return pn.unique();
- }
-
- long use_count() const // never throws
- {
- return pn.use_count();
- }
-
- // implicit conversion to "bool"
-
- typedef long (this_type::*bool_type)() const;
-
- operator bool_type() const // never throws
- {
- return px == 0? 0: &this_type::use_count;
- }
-
- bool operator! () const // never throws
- {
- return px == 0;
- }
-
- void swap(shared_ptr<T> & other) // never throws
- {
- std::swap(px, other.px);
- pn.swap(other.pn);
- }
-
-// Tasteless as this may seem, making all members public allows member templates
-// to work in the absence of member template friends. (Matthew Langston)
-
-#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
-
-private:
-
- template<typename Y> friend class shared_ptr;
- template<typename Y> friend class weak_ptr;
-
-
-#endif
-
- T * px; // contained pointer
- detail::shared_count pn; // reference counter
-
-}; // shared_ptr
-
-template<typename T, typename U> inline bool operator==(shared_ptr<T> const & a, shared_ptr<U> const & b)
-{
- return a.get() == b.get();
-}
-
-template<typename T, typename U> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<U> const & b)
-{
- return a.get() != b.get();
-}
-
-#if __GNUC__ == 2 && __GNUC_MINOR__ <= 96
-
-// Resolve the ambiguity between our op!= and the one in rel_ops
-
-template<typename T> inline bool operator!=(shared_ptr<T> const & a, shared_ptr<T> const & b)
-{
- return a.get() != b.get();
-}
-
-#endif
-
-template<typename T> inline bool operator<(shared_ptr<T> const & a, shared_ptr<T> const & b)
-{
- return std::less<T*>()(a.get(), b.get());
-}
-
-template<typename T> inline void swap(shared_ptr<T> & a, shared_ptr<T> & b)
-{
- a.swap(b);
-}
-
-template<typename T, typename U> shared_ptr<T> shared_static_cast(shared_ptr<U> const & r)
-{
- return shared_ptr<T>(r, detail::static_cast_tag());
-}
-
-template<typename T, typename U> shared_ptr<T> shared_dynamic_cast(shared_ptr<U> const & r)
-{
- return shared_ptr<T>(r, detail::dynamic_cast_tag());
-}
-
-template<typename T, typename U> shared_ptr<T> shared_polymorphic_cast(shared_ptr<U> const & r)
-{
- return shared_ptr<T>(r, detail::polymorphic_cast_tag());
-}
-
-template<typename T, typename U> shared_ptr<T> shared_polymorphic_downcast(shared_ptr<U> const & r)
-{
- BOOST_ASSERT(dynamic_cast<T *>(r.get()) == r.get());
- return shared_static_cast<T>(r);
-}
-
-// get_pointer() enables boost::mem_fn to recognize shared_ptr
-
-template<typename T> inline T * get_pointer(shared_ptr<T> const & p)
-{
- return p.get();
-}
-
-} // namespace boost
-
-#ifdef BOOST_MSVC
-# pragma warning(pop)
-#endif
-
-#endif // #ifndef BOOST_MSVC6_MEMBER_TEMPLATES
+#include <boost/smart_ptr/shared_ptr.hpp>
#endif // #ifndef BOOST_SHARED_PTR_HPP_INCLUDED
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