kicad/include/boost/smart_ptr/detail/sp_counted_base_nt.hpp

108 lines
2.1 KiB
C++

#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