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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);
+ }
+ }
+}
+//$Id$