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Resource(3I)


NAME

   Resource - shared object

SYNOPSIS

   #include <InterViews/resource.h>

DESCRIPTION

   Resource  is  a class that provides a simple form of reference counting
   for shared objects.  Every resource  has  a  reference  count  that  is
   initially set to zero and must be explicitly incremented through a call
   to Reference.  A resource should not be  deleted  like  other  objects;
   instead, the static member function unref should be used to unreference
   the object.

   When a resource is unreferenced, the  reference  count  is  decremented
   unless  it  is  already  zero.   If  the  count  is zero, the object is
   destroyed.

PUBLIC OPERATIONS

   Resource()
          Create a new resource object with its  reference  count  set  to
          zero.

   void ref()
          Increment the resource's reference count.

   void unref()
          Decrement the resource's reference count, if it is positive, and
          delete this if the count is zero.

   static void ref(Resource*)
          If the resource is not  nil,  call  ref  on  it.   Otherwise  do
          nothing.

   static void unref(Resource*)
          If  the  resource  is  not  nil, call unref on it.  Otherwise do
          nothing.

   void Reference()
          This function is equivalent to ref and is  provided  solely  for
          backward compatibility.  It will be removed in a future version.

   void Unreference()
          This  function is equivalent to unref and is provided solely for
          backward compatibility.  It will be removed in a future version.

FRIEND OPERATIONS

   void Unref(Resource*)
          This function is equivalent to  static  unref  and  is  provided
          solely  for  backward  compatibility.   It  will be removed in a
          future version.

BUGS

   This scheme relies on manual referencing, which is more efficient,  but
   also more dangerous.

   When  garbage  collection is supported by the runtime system, resources
   will be unnecessary.



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