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// file : Utility/ReferenceCounting/DefaultImpl.ipp
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2002-2003 Boris Kolpackov
// license : http://kolpackov.net/license.html
namespace Utility
{
namespace ReferenceCounting
{
// c-tor & d-tor
template <typename SynchPolicy>
DefaultImpl<SynchPolicy>::
DefaultImpl () throw (Interface::SystemException)
: ref_count_ (1),
lock_ ()
{
}
template <typename SynchPolicy>
DefaultImpl<SynchPolicy>::
~DefaultImpl () throw ()
{
}
// add_ref, remove_ref and refcount_value member functions
template <typename SynchPolicy>
void DefaultImpl<SynchPolicy>::
add_ref () const throw (Exception, SystemException)
{
WriteGuard_ guard (lock_);
add_ref_i ();
}
template <typename SynchPolicy>
void DefaultImpl<SynchPolicy>::
remove_ref () const throw ()
{
bool destroy (false);
try
{
WriteGuard_ guard (lock_);
destroy = remove_ref_i ();
}
catch (...)
{
// there is nothing we can do
}
if (destroy) delete this;
}
template <typename SynchPolicy>
Interface::count_t DefaultImpl<SynchPolicy>::
refcount_value () const throw (Exception, SystemException)
{
ReadGuard_ guard (lock_);
return refcount_value_i ();
}
// add_ref_i, remove_ref_i and refcount_value_i member functions
template <typename SynchPolicy>
void DefaultImpl<SynchPolicy>::
add_ref_i () const throw (Exception, SystemException)
{
ref_count_++;
}
template <typename SynchPolicy>
bool DefaultImpl<SynchPolicy>::
remove_ref_i () const throw (Exception, SystemException)
{
bool destroy (false);
if (ref_count_ > 0)
{
if (--ref_count_ == 0) destroy = true;
}
else
{
throw InconsistentState (
"Utility::ReferenceCounting::DefaultImpl::_remove_ref_i: "
"reference counter is zero.");
}
return destroy;
}
template <typename SynchPolicy>
Interface::count_t DefaultImpl<SynchPolicy>::
refcount_value_i () const throw (Exception, SystemException)
{
return ref_count_;
}
template <typename SynchPolicy>
typename SynchPolicy::Mutex& DefaultImpl<SynchPolicy>::
lock_i() const throw ()
{
return lock_;
}
}
}
//$Id$
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