/*----------------------------------------------------------------------------*/
/*                                                                            */
/* Copyright (c) 1995, 2004 IBM Corporation. All rights reserved.             */
/* Copyright (c) 2005-2018 Rexx Language Association. All rights reserved.    */
/*                                                                            */
/* This program and the accompanying materials are made available under       */
/* the terms of the Common Public License v1.0 which accompanies this         */
/* distribution. A copy is also available at the following address:           */
/* https://www.oorexx.org/license.html                                        */
/*                                                                            */
/* Redistribution and use in source and binary forms, with or                 */
/* without modification, are permitted provided that the following            */
/* conditions are met:                                                        */
/*                                                                            */
/* Redistributions of source code must retain the above copyright             */
/* notice, this list of conditions and the following disclaimer.              */
/* Redistributions in binary form must reproduce the above copyright          */
/* notice, this list of conditions and the following disclaimer in            */
/* the documentation and/or other materials provided with the distribution.   */
/*                                                                            */
/* Neither the name of Rexx Language Association nor the names                */
/* of its contributors may be used to endorse or promote products             */
/* derived from this software without specific prior written permission.      */
/*                                                                            */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS        */
/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT          */
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/*                                                                            */
/*----------------------------------------------------------------------------*/
/******************************************************************************/
/*                                              VariableReference.hpp         */
/*                                                                            */
/* Indirect reference to a local or object variable.                          */
/*                                                                            */
/******************************************************************************/
#ifndef Included_VariableReference
#define Included_VariableReference

#include "ObjectClass.hpp"

class RexxActivation;
class RexxVariable;


/**
 * A class to a "call-by-name" capability to object Rexx
 */
class VariableReference : public RexxObject
{
public:
    void *operator new(size_t);
    inline void  operator delete(void *) { ; }


    VariableReference(RexxVariable *);
    inline VariableReference(RESTORETYPE restoreType) { ; };

    void live(size_t) override;
    void liveGeneral(MarkReason reason) override;
    void flatten(Envelope *) override;

    void processUnknown(RexxErrorCodes error, RexxString *, RexxObject **, size_t, ProtectedObject &) override;
    RexxString  *stringValue() override;
    bool numberValue(wholenumber_t &result, wholenumber_t precision) override;
    bool numberValue(wholenumber_t &result) override;
    bool unsignedNumberValue(size_t &result, wholenumber_t precision) override;
    bool unsignedNumberValue(size_t &result) override;
    bool doubleValue(double &result) override;
    NumberString *numberString() override;
    RexxInteger *integerValue(wholenumber_t) override;

    RexxObject *newRexx(RexxObject **args, size_t argc);

    RexxObject *getValue();
    void        setValue(RexxObject *);
    void        setValueRexx(RexxObject *);
    RexxString *getName();
    bool        isStem();
    RexxVariable *getVariable() { return variable; }
    RexxObject *unknownRexx(RexxString *message, ArrayClass  *arguments);
    RexxObject  *request(RexxString *);

    static void createInstance();
    static RexxClass *classInstance;   // singleton class instance

protected:

    RexxVariable *variable;        // the referenced variable object
};

#endif

