-#ifndef BOOST_SMART_PTR_WEAK_PTR_HPP_INCLUDED\r
-#define BOOST_SMART_PTR_WEAK_PTR_HPP_INCLUDED\r
-\r
-//\r
-// weak_ptr.hpp\r
-//\r
-// Copyright (c) 2001, 2002, 2003 Peter Dimov\r
-//\r
-// Distributed under the Boost Software License, Version 1.0. (See\r
-// accompanying file LICENSE_1_0.txt or copy at\r
-// http://www.boost.org/LICENSE_1_0.txt)\r
-//\r
-// See http://www.boost.org/libs/smart_ptr/weak_ptr.htm for documentation.\r
-//\r
-\r
-#include <memory> // boost.TR1 include order fix\r
-#include <boost/smart_ptr/detail/shared_count.hpp>\r
-#include <boost/smart_ptr/shared_ptr.hpp>\r
-\r
-#ifdef BOOST_MSVC // moved here to work around VC++ compiler crash\r
-# pragma warning(push)\r
-# pragma warning(disable:4284) // odd return type for operator->\r
-#endif\r
-\r
-namespace boost\r
-{\r
-\r
-template<class T> class weak_ptr\r
-{\r
-private:\r
-\r
- // Borland 5.5.1 specific workarounds\r
- typedef weak_ptr<T> this_type;\r
-\r
-public:\r
-\r
- typedef T element_type;\r
-\r
- weak_ptr(): px(0), pn() // never throws in 1.30+\r
- {\r
- }\r
-\r
-// generated copy constructor, assignment, destructor are fine\r
-\r
-\r
-//\r
-// The "obvious" converting constructor implementation:\r
-//\r
-// template<class Y>\r
-// weak_ptr(weak_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws\r
-// {\r
-// }\r
-//\r
-// has a serious problem.\r
-//\r
-// r.px may already have been invalidated. The px(r.px)\r
-// conversion may require access to *r.px (virtual inheritance).\r
-//\r
-// It is not possible to avoid spurious access violations since\r
-// in multithreaded programs r.px may be invalidated at any point.\r
-//\r
-\r
- template<class Y>\r
-#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )\r
-\r
- weak_ptr( weak_ptr<Y> const & r, typename detail::sp_enable_if_convertible<Y,T>::type = detail::sp_empty() )\r
-\r
-#else\r
-\r
- weak_ptr( weak_ptr<Y> const & r )\r
-\r
-#endif\r
- : px(r.lock().get()), pn(r.pn) // never throws\r
- {\r
- }\r
-\r
-#if defined( BOOST_HAS_RVALUE_REFS )\r
-\r
- template<class Y>\r
-#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )\r
-\r
- weak_ptr( weak_ptr<Y> && r, typename detail::sp_enable_if_convertible<Y,T>::type = detail::sp_empty() )\r
-\r
-#else\r
-\r
- weak_ptr( weak_ptr<Y> && r )\r
-\r
-#endif\r
- : px(r.lock().get()), pn(std::move(r.pn)) // never throws\r
- {\r
- r.px = 0;\r
- }\r
-\r
- // for better efficiency in the T == Y case\r
- weak_ptr( weak_ptr && r ): px( r.px ), pn(std::move(r.pn)) // never throws\r
- {\r
- r.px = 0;\r
- }\r
-\r
- // for better efficiency in the T == Y case\r
- weak_ptr & operator=( weak_ptr && r ) // never throws\r
- {\r
- this_type( std::move( r ) ).swap( *this );\r
- return *this;\r
- }\r
-\r
-\r
-#endif\r
-\r
- template<class Y>\r
-#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )\r
-\r
- weak_ptr( shared_ptr<Y> const & r, typename detail::sp_enable_if_convertible<Y,T>::type = detail::sp_empty() )\r
-\r
-#else\r
-\r
- weak_ptr( shared_ptr<Y> const & r )\r
-\r
-#endif\r
- : px( r.px ), pn( r.pn ) // never throws\r
- {\r
- }\r
-\r
-#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1300)\r
-\r
- template<class Y>\r
- weak_ptr & operator=(weak_ptr<Y> const & r) // never throws\r
- {\r
- px = r.lock().get();\r
- pn = r.pn;\r
- return *this;\r
- }\r
-\r
-#if defined( BOOST_HAS_RVALUE_REFS )\r
-\r
- template<class Y>\r
- weak_ptr & operator=(weak_ptr<Y> && r)\r
- {\r
- this_type( std::move( r ) ).swap( *this );\r
- return *this;\r
- }\r
-\r
-#endif\r
-\r
- template<class Y>\r
- weak_ptr & operator=(shared_ptr<Y> const & r) // never throws\r
- {\r
- px = r.px;\r
- pn = r.pn;\r
- return *this;\r
- }\r
-\r
-#endif\r
-\r
- shared_ptr<T> lock() const // never throws\r
- {\r
- return shared_ptr<element_type>( *this, boost::detail::sp_nothrow_tag() );\r
- }\r
-\r
- long use_count() const // never throws\r
- {\r
- return pn.use_count();\r
- }\r
-\r
- bool expired() const // never throws\r
- {\r
- return pn.use_count() == 0;\r
- }\r
-\r
- bool _empty() const // extension, not in std::weak_ptr\r
- {\r
- return pn.empty();\r
- }\r
-\r
- void reset() // never throws in 1.30+\r
- {\r
- this_type().swap(*this);\r
- }\r
-\r
- void swap(this_type & other) // never throws\r
- {\r
- std::swap(px, other.px);\r
- pn.swap(other.pn);\r
- }\r
-\r
- void _internal_assign(T * px2, boost::detail::shared_count const & pn2)\r
- {\r
- px = px2;\r
- pn = pn2;\r
- }\r
-\r
- template<class Y> bool _internal_less(weak_ptr<Y> const & rhs) const\r
- {\r
- return pn < rhs.pn;\r
- }\r
-\r
-// Tasteless as this may seem, making all members public allows member templates\r
-// to work in the absence of member template friends. (Matthew Langston)\r
-\r
-#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS\r
-\r
-private:\r
-\r
- template<class Y> friend class weak_ptr;\r
- template<class Y> friend class shared_ptr;\r
-\r
-#endif\r
-\r
- T * px; // contained pointer\r
- boost::detail::weak_count pn; // reference counter\r
-\r
-}; // weak_ptr\r
-\r
-template<class T, class U> inline bool operator<(weak_ptr<T> const & a, weak_ptr<U> const & b)\r
-{\r
- return a._internal_less(b);\r
-}\r
-\r
-template<class T> void swap(weak_ptr<T> & a, weak_ptr<T> & b)\r
-{\r
- a.swap(b);\r
-}\r
-\r
-} // namespace boost\r
-\r
-#ifdef BOOST_MSVC\r
-# pragma warning(pop)\r
-#endif \r
-\r
-#endif // #ifndef BOOST_SMART_PTR_WEAK_PTR_HPP_INCLUDED\r
+#ifndef BOOST_SMART_PTR_WEAK_PTR_HPP_INCLUDED
+#define BOOST_SMART_PTR_WEAK_PTR_HPP_INCLUDED
+
+//
+// weak_ptr.hpp
+//
+// Copyright (c) 2001, 2002, 2003 Peter Dimov
+//
+// 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/weak_ptr.htm for documentation.
+//
+
+#include <memory> // boost.TR1 include order fix
+#include <boost/smart_ptr/detail/shared_count.hpp>
+#include <boost/smart_ptr/shared_ptr.hpp>
+
+#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
+{
+
+template<class T> class weak_ptr
+{
+private:
+
+ // Borland 5.5.1 specific workarounds
+ typedef weak_ptr<T> this_type;
+
+public:
+
+ typedef T element_type;
+
+ weak_ptr(): px(0), pn() // never throws in 1.30+
+ {
+ }
+
+// generated copy constructor, assignment, destructor are fine
+
+
+//
+// The "obvious" converting constructor implementation:
+//
+// template<class Y>
+// weak_ptr(weak_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws
+// {
+// }
+//
+// has a serious problem.
+//
+// r.px may already have been invalidated. The px(r.px)
+// conversion may require access to *r.px (virtual inheritance).
+//
+// It is not possible to avoid spurious access violations since
+// in multithreaded programs r.px may be invalidated at any point.
+//
+
+ template<class Y>
+#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
+
+ weak_ptr( weak_ptr<Y> const & r, typename detail::sp_enable_if_convertible<Y,T>::type = detail::sp_empty() )
+
+#else
+
+ weak_ptr( weak_ptr<Y> const & r )
+
+#endif
+ : px(r.lock().get()), pn(r.pn) // never throws
+ {
+ }
+
+#if defined( BOOST_HAS_RVALUE_REFS )
+
+ template<class Y>
+#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
+
+ weak_ptr( weak_ptr<Y> && r, typename detail::sp_enable_if_convertible<Y,T>::type = detail::sp_empty() )
+
+#else
+
+ weak_ptr( weak_ptr<Y> && r )
+
+#endif
+ : px(r.lock().get()), pn(std::move(r.pn)) // never throws
+ {
+ r.px = 0;
+ }
+
+ // for better efficiency in the T == Y case
+ weak_ptr( weak_ptr && r ): px( r.px ), pn(std::move(r.pn)) // never throws
+ {
+ r.px = 0;
+ }
+
+ // for better efficiency in the T == Y case
+ weak_ptr & operator=( weak_ptr && r ) // never throws
+ {
+ this_type( std::move( r ) ).swap( *this );
+ return *this;
+ }
+
+
+#endif
+
+ template<class Y>
+#if !defined( BOOST_SP_NO_SP_CONVERTIBLE )
+
+ weak_ptr( shared_ptr<Y> const & r, typename detail::sp_enable_if_convertible<Y,T>::type = detail::sp_empty() )
+
+#else
+
+ weak_ptr( shared_ptr<Y> const & r )
+
+#endif
+ : px( r.px ), pn( r.pn ) // never throws
+ {
+ }
+
+#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1300)
+
+ template<class Y>
+ weak_ptr & operator=(weak_ptr<Y> const & r) // never throws
+ {
+ px = r.lock().get();
+ pn = r.pn;
+ return *this;
+ }
+
+#if defined( BOOST_HAS_RVALUE_REFS )
+
+ template<class Y>
+ weak_ptr & operator=(weak_ptr<Y> && r)
+ {
+ this_type( std::move( r ) ).swap( *this );
+ return *this;
+ }
+
+#endif
+
+ template<class Y>
+ weak_ptr & operator=(shared_ptr<Y> const & r) // never throws
+ {
+ px = r.px;
+ pn = r.pn;
+ return *this;
+ }
+
+#endif
+
+ shared_ptr<T> lock() const // never throws
+ {
+ return shared_ptr<element_type>( *this, boost::detail::sp_nothrow_tag() );
+ }
+
+ long use_count() const // never throws
+ {
+ return pn.use_count();
+ }
+
+ bool expired() const // never throws
+ {
+ return pn.use_count() == 0;
+ }
+
+ bool _empty() const // extension, not in std::weak_ptr
+ {
+ return pn.empty();
+ }
+
+ void reset() // never throws in 1.30+
+ {
+ this_type().swap(*this);
+ }
+
+ void swap(this_type & other) // never throws
+ {
+ std::swap(px, other.px);
+ pn.swap(other.pn);
+ }
+
+ void _internal_assign(T * px2, boost::detail::shared_count const & pn2)
+ {
+ px = px2;
+ pn = pn2;
+ }
+
+ template<class Y> bool _internal_less(weak_ptr<Y> const & rhs) const
+ {
+ return pn < rhs.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<class Y> friend class weak_ptr;
+ template<class Y> friend class shared_ptr;
+
+#endif
+
+ T * px; // contained pointer
+ boost::detail::weak_count pn; // reference counter
+
+}; // weak_ptr
+
+template<class T, class U> inline bool operator<(weak_ptr<T> const & a, weak_ptr<U> const & b)
+{
+ return a._internal_less(b);
+}
+
+template<class T> void swap(weak_ptr<T> & a, weak_ptr<T> & b)
+{
+ a.swap(b);
+}
+
+} // namespace boost
+
+#ifdef BOOST_MSVC
+# pragma warning(pop)
+#endif
+
+#endif // #ifndef BOOST_SMART_PTR_WEAK_PTR_HPP_INCLUDED
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