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");
  }

  bool isSet() const {
    return _isSet;
  }

  double operator()() const {
    return _value;
  }

protected:

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


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

private:

  double _value;

  bool _isSet;

};

}

#endif