MagField.cxx

Go to the documentation of this file.

#include "AtlfastEvent/MagField.h" 
#include <iostream>

namespace Atlfast{

  MagField* MagField::m_instance = 0;

  MagField::MagField(double str) : m_strength(str) {}
  
  MagField* MagField::Instance(){
    return Instance(0);
  }
  
  MagField* MagField::Instance(double str) {
    
    // User gets the MagField singleton using Instance(),
    // so the default 0 is passed as argument. If a finite argument is
    // passed, it is assumed the user wants a new MagField with this
    // field strength.

    if ( m_instance != 0 && str ){
      
      std::cout << "MagField instance already exists with field strength "
                << m_instance->strength() << ", using that" << std::endl;
    }
    
    if ( m_instance == 0 ){
      m_instance = new MagField(str);
    }
    
    return m_instance;
    
  }
  
  bool MagField::is_on() const {
    
    return m_strength ? true : false;
    
  }
  
  double MagField::strength() const {
    
    return m_strength;
    
  }

}

---