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// -*- C++ -*-
//=============================================================================
/**
* @file Null_RefCount_Policy.h
*
* $Id$
*
* Header file for TAO's reference count policy (unrelated to CORBA
* policies).
*
* @author Ossama Othman <ossama@dre.vanderbilt.edu>
*/
//=============================================================================
#ifndef TAO_NULL_REFCOUNT_POLICY_H
#define TAO_NULL_REFCOUNT_POLICY_H
#include /**/ "ace/pre.h"
#include "tao/AnyTypeCode/TAO_AnyTypeCode_Export.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "tao/Versioned_Namespace.h"
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
namespace TAO
{
/**
* @class Null_RefCount_Policy
*
* @brief No-op reference counting policy.
*
* This class is intended to be used as a "policy" argument to a
* host class template that implements no-op reference counting.
* That class would then inherit privately from it like so:
*
* @code
* template <class RefCountPolicy>
* class MyHostClass : private RefCountPolicy
* {
* public:
* void my_add_ref (void) { this->RefCountPolicy::add_ref (); }
* void my_remove_ref (void) { this->RefCountPolicy::remove_ref (); }
* };
* @endcode
*
* and use it like so:
*
* @code
* typedef MyHostClass<TAO::Null_RefCount_Policy> MyNonRefCountedClass;
* MyNonRefCountedClass m;
* ...
* @endcode
*
* @note In order to incur no size overhead on the host class due to
* virtual tables, no base class defining an interface is
* defined. This allows C++ compilers to apply the Empty Base
* Class Optimization.
*/
class TAO_AnyTypeCode_Export Null_RefCount_Policy
{
public:
/// No-op reference increment.
void add_ref (void) { }
/// No-op reference decrement.
void remove_ref (void) { }
};
} // End namespace TAO
TAO_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif /* TAO_NULL_REFCOUNT_POLICY_H */
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