---

Class.h

//   -*- C++ -*-
/*****************************************************************************
 *
 *   |_|_|_  |_|_    |_    |_|_|_  |_                C O M M U N I C A T I O N
 * |_        |_  |_  |_  |_        |_                          N E T W O R K S
 * |_        |_  |_  |_  |_        |_                                C L A S S
 *   |_|_|_  |_    |_|_    |_|_|_  |_|_|_|_                      L I B R A R Y
 *
 * $Id: Class.h,v 1.2 2002/01/14 11:03:24 spee Exp $
 *
 * CNClass: CNClass --- CNClass description class
 *
 *****************************************************************************
 * Copyright (C) 1992-2002   Communication Networks
 *                           Aachen University of Technology
 *                           D-52056 Aachen
 *                           Germany
 *                           Email: cncl-adm@comnets.rwth-aachen.de
 *****************************************************************************
 * This file is part of the CN class library. All files marked with
 * this header are free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.  This library is
 * distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
 * License for more details.  You should have received a copy of the GNU
 * Library General Public License along with this library; if not, write
 * to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
 * USA.
 *****************************************************************************/

#ifndef __Class_h
#define __Class_h


#include <CNCL/Object.h>


class CNClass;
class CNParam;


/*
 * Type description for class CNClass
 */

extern CNClassDesc CN_CLASS;



/*
 * CNClass provides description of classes and creation of new objects
 * via exemplar objects. CNClass is used for the type description
 * objects. For each class in the CNCL hierarchy there is a
 * corresponding object of type CNClass. A pointer to this object is
 * used for the CNCL runtime type information.  */
class CNClass : public CNObject
{
public:
    CNClass(char *new_name, char *new_version,
            CNObject *(*new_func)(CNParam *param))
        : c_name(new_name), c_version(new_version), c_func(new_func) {}
private:
    const char *c_name;                 // CNClass name
    const char *c_version;              // CNClass version
    CNObject *(*c_func)(CNParam *param);        // CLASS::new_object() function
    
public:
    
    virtual CNClassDesc class_desc() const      // CNClass description
        { return CN_CLASS; }
            
    virtual bool is_a(CNClassDesc desc) const   
        { return desc == CN_CLASS ? TRUE : CNObject::is_a(desc); }
    

    static CNClass *cast_from_object(CNObject *obj) 
        {
#   ifdef NO_TYPE_CHECK
            return (CNClass *)obj;
#   else
            return (CNClass *)( !obj || obj->is_a(CN_CLASS)
                                ? obj : fatal_type(obj->class_desc(), CN_CLASS) );
#   endif
        }


    const char *name() const
        {
            return c_name;
        }
    const char *get_name() const
        {
            return c_name;
        }
    const char *version() const
        {
            return c_version;
        }
    const char *get_version() const
        {
            return c_version;
        }
    
    CNObject *new_object(CNParam *param = NIL) const;
    CNObject *new_object(CNParam &param) const;

    // Print/debug output
    virtual void print(ostream &strm = cout) const;
    virtual void dump (ostream &strm = cout) const;
};


#endif 

---