Integer.h

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/*
 * Integer.h
 *
 * Smalltalk like class library for C++
 * Small integer (native long wrapper). Header.
 *
 * Copyright (c) 2004 Milan Cermak, Martin Dvorak
 */
/*
 * 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 __INTEGER_H
#define __INTEGER_H

#include <stlib/Number.h>

namespace Core {

class Array;
class String;
class Stream;

class Real;

class Integer : public Number
{
  protected:
    long long _value;

    static Array _instances;

  protected:
    Integer(long long val);

  public:
    virtual String *className(void) const;

    /* Instance creation protocol */
    static Integer *value(long long val);

    /* Converting protocol */
    virtual double asDouble(void) const;
    virtual long long asLongLong(void) const;

    /* Comparing protocol */
    virtual long hash(void) const;
    virtual bool isEqual(const Object *object) const;
    virtual bool isEqual(const Object &object) const
      { return Number::isEqual(object); }
    virtual bool isEqual(int arg) const
      { return Number::isEqual(arg); }
    virtual bool isEqual(double arg) const
      { return Number::isEqual(arg); }

    /* Double dispatching protocol */
    virtual bool isEqualToDouble(double arg) const;
    virtual bool isEqualToLongLong(long long arg) const;

    /* Evaluating protocol */
    virtual Number* negate(void);

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

    /* Testing protocol */
    virtual bool isInteger(void) const;
    virtual bool isPositive(void) const;
    virtual bool isZero(void) const;
};

};

#endif /* __INTEGER_H */

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