Object.h

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/*
 * Object.h
 *
 * Smalltalk like class library for C++
 * Base class. Header.
 *
 * Copyright (c) 2003-05 Milan Cermak
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __OBJECT_H
#define __OBJECT_H

#if !defined(NOGC)
#  define GC_LINUX_THREADS
#  ifndef _REENTRANT
#    define _REENTRANT
#  endif
#  include <gc/gc_cpp.h>
#endif

#define nil (0)

#define abstract = 0

#if defined __GNUC__ && defined __GNUC_MINOR__
# define __GNUC_PREREQ(maj, min) \
        ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
#else
# define __GNUC_PREREQ(maj, min) 0
#endif

namespace Core {

class Collection;
class String;
class Stream;
class Visitor;

class Object
#if !defined(NOGC)
             : public gc_cleanup
#endif
{
  protected:
    long oid;       
  public:
    Object(void);
    virtual ~Object(void);

    /* Class-accessing protocol */
    virtual String *className(void) const;

    /* Error handling protocol */
    virtual void error(String *message, String *selector = nil,
                       Object *parameter = nil);

    virtual void shouldNotImplement(String *selector);
    virtual void shouldNotImplement(const char *selector);

    /* Comparing protocol */
    virtual long hash(void) const;
    virtual bool isEqual(const Object *object) const;
    virtual bool isEqual(const Object &object) const;

    virtual bool isEqualToByteArray(const Object *array) const;

    virtual bool operator==(const Object &object) const;

    virtual bool isIdentical(const Object *object) const;
    virtual bool isIdentical(const Object &object) const;

    /* Printing protocol */
    virtual void printOn(Stream *stream) const;
    virtual String *printString(void) const;

    /* Testing protocol */
    virtual bool isAssociation(void) const;
    virtual bool isBoolean(void) const;
    virtual bool isCharacter(void) const;
    virtual bool isNumber(void) const;
    virtual bool isString(void) const;

    virtual bool isInstanceOf(String *className);

    virtual bool isInstanceOf(const char *className);

    /* Visiting protocol */
    virtual void visitBy(Visitor *visitor);
};

};

using namespace Core;    // Make Core namespace globally accessible

#endif /* __OBJECT_H */

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