author | lorewang |
Wed, 01 Dec 2010 16:05:36 +0800 | |
changeset 715 | e0739b8406dd |
parent 0 | 044383f39525 |
permissions | -rw-r--r-- |
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#ifndef BOOST_SMART_PTR_WEAK_PTR_HPP_INCLUDED |
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#define BOOST_SMART_PTR_WEAK_PTR_HPP_INCLUDED |
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// |
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// weak_ptr.hpp |
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// |
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// Copyright (c) 2001, 2002, 2003 Peter Dimov |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// See http://www.boost.org/libs/smart_ptr/weak_ptr.htm for documentation. |
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// |
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#include <memory> // boost.TR1 include order fix |
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#include <boost/smart_ptr/detail/shared_count.hpp> |
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#include <boost/smart_ptr/shared_ptr.hpp> |
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#ifdef BOOST_MSVC // moved here to work around VC++ compiler crash |
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# pragma warning(push) |
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# pragma warning(disable:4284) // odd return type for operator-> |
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#endif |
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namespace boost |
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{ |
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template<class T> class weak_ptr |
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{ |
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private: |
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// Borland 5.5.1 specific workarounds |
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typedef weak_ptr<T> this_type; |
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public: |
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typedef T element_type; |
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weak_ptr(): px(0), pn() // never throws in 1.30+ |
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{ |
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} |
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// generated copy constructor, assignment, destructor are fine |
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// |
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// The "obvious" converting constructor implementation: |
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// |
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// template<class Y> |
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// weak_ptr(weak_ptr<Y> const & r): px(r.px), pn(r.pn) // never throws |
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// { |
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// } |
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// |
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// has a serious problem. |
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// |
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// r.px may already have been invalidated. The px(r.px) |
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// conversion may require access to *r.px (virtual inheritance). |
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// |
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// It is not possible to avoid spurious access violations since |
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// in multithreaded programs r.px may be invalidated at any point. |
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// |
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template<class Y> |
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#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) |
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weak_ptr( weak_ptr<Y> const & r, typename detail::sp_enable_if_convertible<Y,T>::type = detail::sp_empty() ) |
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#else |
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weak_ptr( weak_ptr<Y> const & r ) |
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#endif |
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: pn(r.pn) // never throws |
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{ |
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px = r.lock().get(); |
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} |
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template<class Y> |
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#if !defined( BOOST_SP_NO_SP_CONVERTIBLE ) |
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weak_ptr( shared_ptr<Y> const & r, typename detail::sp_enable_if_convertible<Y,T>::type = detail::sp_empty() ) |
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#else |
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weak_ptr( shared_ptr<Y> const & r ) |
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#endif |
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: px( r.px ), pn( r.pn ) // never throws |
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{ |
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} |
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#if !defined(BOOST_MSVC) || (BOOST_MSVC >= 1300) |
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template<class Y> |
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weak_ptr & operator=(weak_ptr<Y> const & r) // never throws |
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{ |
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px = r.lock().get(); |
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pn = r.pn; |
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return *this; |
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} |
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template<class Y> |
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weak_ptr & operator=(shared_ptr<Y> const & r) // never throws |
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{ |
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px = r.px; |
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pn = r.pn; |
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return *this; |
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} |
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#endif |
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shared_ptr<T> lock() const // never throws |
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{ |
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return shared_ptr<element_type>( *this, boost::detail::sp_nothrow_tag() ); |
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} |
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long use_count() const // never throws |
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{ |
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return pn.use_count(); |
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} |
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bool expired() const // never throws |
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{ |
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return pn.use_count() == 0; |
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} |
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void reset() // never throws in 1.30+ |
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{ |
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this_type().swap(*this); |
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} |
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void swap(this_type & other) // never throws |
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{ |
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std::swap(px, other.px); |
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pn.swap(other.pn); |
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} |
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void _internal_assign(T * px2, boost::detail::shared_count const & pn2) |
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{ |
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px = px2; |
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pn = pn2; |
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} |
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template<class Y> bool _internal_less(weak_ptr<Y> const & rhs) const |
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{ |
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return pn < rhs.pn; |
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} |
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// Tasteless as this may seem, making all members public allows member templates |
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// to work in the absence of member template friends. (Matthew Langston) |
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#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS |
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private: |
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template<class Y> friend class weak_ptr; |
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template<class Y> friend class shared_ptr; |
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#endif |
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T * px; // contained pointer |
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boost::detail::weak_count pn; // reference counter |
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}; // weak_ptr |
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template<class T, class U> inline bool operator<(weak_ptr<T> const & a, weak_ptr<U> const & b) |
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{ |
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return a._internal_less(b); |
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} |
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template<class T> void swap(weak_ptr<T> & a, weak_ptr<T> & b) |
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{ |
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a.swap(b); |
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} |
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} // namespace boost |
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#ifdef BOOST_MSVC |
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# pragma warning(pop) |
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#endif |
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#endif // #ifndef BOOST_SMART_PTR_WEAK_PTR_HPP_INCLUDED |