ConstChannel.h

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#ifndef OPALX_ConstChannel_HH
#define OPALX_ConstChannel_HH
 
// ------------------------------------------------------------------------
// $RCSfile: ConstChannel.h,v $
// ------------------------------------------------------------------------
// $Revision: 1.1.1.1 $
// ------------------------------------------------------------------------
// Copyright: see Copyright.readme
// ------------------------------------------------------------------------
//
// Class: ConstChannel
//
// ------------------------------------------------------------------------
// Class category: Channels
// ------------------------------------------------------------------------
//
// $Date: 2000/03/27 09:32:35 $
// $Author: fci $
//
// ------------------------------------------------------------------------
 
// Class ConstChannel
// ------------------------------------------------------------------------
//  Class ConstChannel allows access to an arbitrary [b]double[/b] value.
 
class ConstChannel {
public:
    ConstChannel();
    virtual ~ConstChannel();
 
    virtual ConstChannel* clone() const = 0;
 
    //  If the channel can be read, set [b]value[/b] and return true,
    //  otherwise return false.
    virtual bool get(double& value) const = 0;
 
    //  Return the value read from the channel.
    operator double() const {
        double value = 0.0;
        get(value);
        return value;
    }
 
    //  Return false for this class (channel cannot be set).
    virtual bool isSettable() const;
 
private:
    // Not implemented.
    ConstChannel(const ConstChannel&);
    const ConstChannel& operator=(const ConstChannel&);
};
 
#endif  // OPALX_ConstChannel_HH