SingleValueProjection.hh

// -*- C++ -*-
#ifndef RIVET_SINGLEVALUEPROJECTION_HH
#define RIVET_SINGLEVALUEPROJECTION_HH
 
#include "Rivet/Projection.hh"
 
namespace Rivet {
 

  class SingleValueProjection : public Projection {
  public:

    SingleValueProjection()
        : _value(-1.0), _isSet(false) {
      setName("SingleValueProjection");
    }

    using Projection::operator=;
 

    bool isValueSet() const {
      return _isSet;
    }

    double value() const {
      return _value;
    }

    double operator()() const {
      return value();
    }
 
 
  protected:

    void setValue(double v) {
      _value = v;
      _isSet = true;
    }

    void clear() {
      _value = -1.0;
      _isSet = false;
    }
 
 
  protected:
 
    double _value;

    bool _isSet;
  };
 
 
}
 
#endif