MagField.h

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//=================================================
//
// MagField.h - class to provide information about
//              the solenoid in the current run 
//              A singleton MagField is initially
//              made by the GlobalEventDataMaker, then
//              accessed by other Algorithms and classes
//
// Authors: Peter Sherwood
//          Simon Dean
//
//
//===================================================
#ifndef ATLFAST_MAGFIELD_H
#define ATLFAST_MAGFIELD_H
#include "HepMC/GenParticle.h"
#include "AtlfastEvent/ChargeService.h"
#include "AtlfastEvent/MCparticleCollection.h"
#include "AtlfastEvent/CollectionDefs.h"

namespace Atlfast{
  
  class MagField {

  public:
    
    static MagField* Instance();
    static MagField* Instance(double);    
    bool is_on() const;
    double strength() const;
    
  private:
    
    MagField(double);
    ~MagField(){};    
    
    // The MagField singleton
    static MagField* m_instance;
    
    // Only field strength is stored, 
    // will add direction later
    const double m_strength;
    
  };
}
#endif  

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