Channel.h

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#ifndef OPALX_Channel_HH
#define OPALX_Channel_HH
 
// ------------------------------------------------------------------------
// $RCSfile: Channel.h,v $
// ------------------------------------------------------------------------
// $Revision: 1.1.1.1 $
// ------------------------------------------------------------------------
// Copyright: see Copyright.readme
// ------------------------------------------------------------------------
//
// Class: Channel
//
// ------------------------------------------------------------------------
// Class category: Channels
// ------------------------------------------------------------------------
//
// $Date: 2000/03/27 09:32:35 $
// $Author: fci $
//
// ------------------------------------------------------------------------
 
#include "Channels/ConstChannel.h"
 
// Class Channel
// ------------------------------------------------------------------------
//  Class Channel allows access to an arbitrary [b]double[/b] value.
 
class Channel : public ConstChannel {
public:
    Channel();
    virtual ~Channel();
 
    virtual Channel* clone() const = 0;
 
    double operator=(double value) {
        set(value);
        return value;
    }
 
    double operator+=(double value) {
        double temp;
        get(temp);
        temp += value;
        set(temp);
        return temp;
    }
 
    double operator-=(double value) {
        double temp;
        get(temp);
        temp -= value;
        set(temp);
        return temp;
    }
 
    //  If the channel can be written,
    //  store [b]value[/b] into it and return true,
    //  otherwise return false.
    virtual bool set(double value) = 0;
 
    //  Return true, if the channel can receive values.
    virtual bool isSettable() const;
 
private:
    // Not implemented.
    Channel(const Channel&);
    const Channel& operator=(const Channel&);
};
 
#endif  // OPALX_Channel_HH