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/* -*- C++ -*- */
// $Id$
// ============================================================================
//
// = LIBRARY
// ace
//
// = FILENAME
// Functor.h
//
// = DESCRIPTION
// Non-templatized classes for implementing the GOF Command Pattern,
// also known as functors or function objects.
//
// = AUTHOR
// Chris Gill <cdgill@cs.wustl.edu>
//
// Based on Command Pattern implementations originally done by
//
// Carlos O'Ryan <coryan@cs.wustl.edu> and
// Douglas C. Schmidt <schmidt@cs.wustl.edu> and
// Sergio Flores-Gaitan <sergio@cs.wustl.edu>
//
// ============================================================================
#if !defined (ACE_FUNCTOR_H)
#define ACE_FUNCTOR_H
#include "ace/OS.h"
class ACE_Command_Base
{
// = TITLE
// Defines an abstract class that allows us to invoke commands
// without knowing anything about the implementation.
//
// = DESCRIPTION
// This class declares an interface to execute a command
// independent of the effect of the command, or the objects used
// to implement it.
public:
ACE_Command_Base (void) {}
// Default constructor.
virtual ~ACE_Command_Base (void) {}
// Virtaul destructor.
virtual int execute (void *arg = 0) = 0;
// Invokes the method encapsulated by the command, passing along the
// passed argument (if any). Users of classes derived from this
// class must ensure that the resulting invocation can tolerate
// a null void pointer being passed, or otherwise ensure that
// this will never occur.
};
#if defined (__ACE_INLINE__)
#include "ace/Functor.i"
#endif /* __ACE_INLINE__ */
// Include the templates here.
#include "ace/Functor_T.h"
#endif /* ACE_FUNCTOR_H */
// EOF
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