Number.h

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/*
 * Number.h
 *
 * Smalltalk like class library for C++
 * Abstract number. Header.
 *
 * Copyright (c) 2003, 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 __NUMBER_H
#define __NUMBER_H

#include <stdio.h>

#include <stlib/Object.h>

namespace Core {

class String;
class Visitor;

class Integer;
class Real;

class Number : public Object
{
  public:
    /* Class-accessing protocol */
    virtual String* className(void) const;

    /* Instance creation protocol */
    static Number *fromString(String *str);
    static Number *fromStringRadix(String *str, int radix);

    /* Converting protocol */
    virtual operator long(void) const;
    virtual long asLong(void) const;
    virtual operator unsigned long(void) const;
    virtual unsigned long asUnsignedLong(void) const;
    virtual operator long long(void) const;
    virtual long long asLongLong(void) const abstract;
    virtual operator double(void) const;
    virtual double asDouble(void) const abstract;

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

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

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

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

    virtual bool isNegative(void) const;
    virtual bool isNumber(void) const;

    virtual bool isPositive(void) const abstract;
    virtual bool isReal(void) const;

    virtual bool isZero(void) const abstract;

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

};

#endif /* __NUMBER_H */

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