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// file : Utility/ReferenceCounting/SmartPtr.tpp
// 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's & d-tor
template <typename T>
SmartPtr<T>::
SmartPtr () throw ()
: ptr_ (0)
{
}
template <typename T>
SmartPtr<T>::
SmartPtr (Type* ptr) throw ()
: ptr_ (ptr)
{
}
template <typename T>
SmartPtr<T>::
SmartPtr (SmartPtr<Type> const& s_ptr)
throw (Interface::Exception, Interface::SystemException)
: ptr_ (add_ref (s_ptr.in ()))
{
}
template <typename T>
template <typename Other>
SmartPtr<T>::
SmartPtr (SmartPtr<Other> const& s_ptr)
throw (Interface::Exception, Interface::SystemException)
: ptr_ (add_ref (s_ptr.in ()))
{
}
template <typename T>
SmartPtr<T>::
~SmartPtr () throw ()
{
// This is an additional catch-all layer to protect from
// non-conformant Type.
try
{
if (ptr_ != 0) ptr_->remove_ref ();
}
catch (...)
{
}
}
// operator=
template <typename T>
SmartPtr<T>& SmartPtr<T>::
operator= (Type* ptr) throw ()
{
if (ptr_ != 0) ptr_->remove_ref ();
ptr_ = ptr;
return *this;
}
template <typename T>
SmartPtr<T>& SmartPtr<T>::
operator= (SmartPtr<Type> const& s_ptr)
throw (Interface::Exception, Interface::SystemException)
{
Type* old_ptr (ptr_);
Type* new_ptr (add_ref (s_ptr.in ())); // this can throw
if (old_ptr != 0) old_ptr->remove_ref ();
ptr_ = new_ptr; // commit
return *this;
}
template <typename T>
template <typename Other>
SmartPtr<T>& SmartPtr<T>::
operator= (SmartPtr<Other> const& s_ptr)
throw (Interface::Exception, Interface::SystemException)
{
Type* old_ptr (ptr_);
Other* new_ptr (add_ref (s_ptr.in ())); // this can throw
if (old_ptr != 0) old_ptr->remove_ref ();
ptr_ = new_ptr; // commit
return *this;
}
// conversions
template <typename T>
SmartPtr<T>::
operator T* () const throw ()
{
return ptr_;
}
// accessors
template <typename T>
T* SmartPtr<T>::
operator-> () const throw (NotInitialized)
{
if (ptr_ == 0)
{
throw NotInitialized(
"Utility::ReferenceCounting::SmartPtr::operator-> : "
"unable to dereference NULL pointer.");
}
return ptr_;
}
template <typename T>
T* SmartPtr<T>::
in () const throw ()
{
return ptr_;
}
template <typename T>
T* SmartPtr<T>::
retn() throw ()
{
Type* ret (ptr_);
ptr_ = 0;
return ret;
}
// Specialization of add_ref function for SmartPtr<T>
template <typename T>
T*
add_ref (SmartPtr<T> const& ptr)
throw (Interface::Exception, Interface::SystemException)
{
// delegate to generic implementation
return add_ref (ptr.in ());
}
// Dynamic type conversion function for SmartPtr's
template <typename D, typename S>
D*
smart_cast (SmartPtr<S> const& s)
throw (Interface::Exception, Interface::SystemException)
{
return add_ref (dynamic_cast<D*>(s.in ()));
}
// Acquisition function
template <typename T>
SmartPtr<T>
acquire (T* ptr) throw (Interface::Exception, Interface::SystemException)
{
return SmartPtr<T> (ptr);
}
}
}
//$Id$
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