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Diffstat (limited to '3rdParty/Boost/boost/smart_ptr/weak_ptr.hpp')
-rw-r--r-- | 3rdParty/Boost/boost/smart_ptr/weak_ptr.hpp | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/3rdParty/Boost/boost/smart_ptr/weak_ptr.hpp b/3rdParty/Boost/boost/smart_ptr/weak_ptr.hpp new file mode 100644 index 0000000..bf5296a --- /dev/null +++ b/3rdParty/Boost/boost/smart_ptr/weak_ptr.hpp @@ -0,0 +1,182 @@ +#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 + : pn(r.pn) // never throws + { + px = r.lock().get(); + } + + 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; + } + + 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; + } + + 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 |