#ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED #define BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED // MS compatible compilers support #pragma once #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma once #endif // // detail/sp_counted_base_nt.hpp // // Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. // Copyright 2004-2005 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) // #include <boost/detail/sp_typeinfo.hpp> namespace boost { namespace detail { class sp_counted_base { private: sp_counted_base( sp_counted_base const & ); sp_counted_base & operator= ( sp_counted_base const & ); long use_count_; // #shared long weak_count_; // #weak + (#shared != 0) public: sp_counted_base(): use_count_( 1 ), weak_count_( 1 ) { } virtual ~sp_counted_base() // nothrow { } // dispose() is called when use_count_ drops to zero, to release // the resources managed by *this. virtual void dispose() = 0; // nothrow // destroy() is called when weak_count_ drops to zero. virtual void destroy() // nothrow { delete this; } virtual void * get_deleter( sp_typeinfo const & ti ) = 0; void add_ref_copy() { ++use_count_; } bool add_ref_lock() // true on success { if( use_count_ == 0 ) return false; ++use_count_; return true; } void release() // nothrow { if( --use_count_ == 0 ) { dispose(); weak_release(); } } void weak_add_ref() // nothrow { ++weak_count_; } void weak_release() // nothrow { if( --weak_count_ == 0 ) { destroy(); } } long use_count() const // nothrow { return use_count_; } }; } // namespace detail } // namespace boost #endif // #ifndef BOOST_SMART_PTR_DETAIL_SP_COUNTED_BASE_NT_HPP_INCLUDED