StRoot: StTrsMaker/include/StSimpleMagneticField.hh Source File

00001 /***************************************************************************
00002  *
00003  * $Id: StSimpleMagneticField.hh,v 1.6 2003/09/02 17:59:16 perev Exp $
00004  *
00005  * Author: Thomas Ullrich, May 1998 
00006  ***************************************************************************
00007  *
00008  * Description: Class is implemented as a Singleton
00009  *
00010  ***************************************************************************
00011  *
00012  * $Log: StSimpleMagneticField.hh,v $
00013  * Revision 1.6  2003/09/02 17:59:16  perev
00014  * gcc 3.2 updates + WarnOff
00015  *
00016  * Revision 1.5  2000/01/10 23:11:29  lasiuk
00017  * Include MACROS for compatibility with SUN CC5.0
00018  *
00019  * Revision 1.4  1999/06/16 14:26:51  fisyak
00020  * Add flags for egcs on Solaris
00021  *
00022  * Revision 1.3  1999/03/15 13:45:59  lasiuk
00023  * include SystemOfUnits from SCL
00024  *
00025  * Revision 1.2  1999/01/20 16:38:56  lasiuk
00026  * add threevector capability
00027  *
00028  * Revision 1.1  1998/11/10 17:12:05  fisyak
00029  * Put Brian trs versin into StRoot
00030  *
00031  * Revision 1.2  1998/05/20 19:00:00  ullrich
00032  * Renamed getInstance() to instance().
00033  *
00034  * Revision 1.1  1998/05/20 14:58:25  ullrich
00035  * Initial Revision
00036  *
00037  **************************************************************************/
00038 #ifndef ST_SIMPLE_MAGNETIC_FIELD
00039 #define ST_SIMPLE_MAGNETIC_FIELD
00040 
00041 #include <Stiostream.h>
00042 
00043 #if  defined(__sun) && ! defined(__GNUG__)
00044 #include <stdcomp.h>
00045 #endif
00046 #include "SystemOfUnits.h"
00047 #ifndef ST_NO_NAMESPACES
00048 using namespace units;
00049 #endif
00050 
00051 #include "StMagneticField.hh"
00052 
00053 class StSimpleMagneticField : public StMagneticField {
00054 public:
00055     ~StSimpleMagneticField();
00056     
00057     static StMagneticField* instance();
00058     static StMagneticField* instance(const StThreeVector<double>& B);
00059     static StMagneticField* instance(const char* file);
00060     
00061     const StThreeVector<double>& at(const StGlobalCoordinate& gc) const;
00062     const StThreeVector<double>& at(const StThreeVector<double>& v) const;
00063 
00064 private:
00065     StSimpleMagneticField();
00066     StSimpleMagneticField(const StThreeVector<double>&);
00067     StSimpleMagneticField(const char*);                 
00068     
00069 private:
00070     StThreeVector<double> mB;
00071     static StMagneticField* mInstance;
00072 };
00073 
00074 
00075 //
00076 //   Inline member functions
00077 //
00078 
00079 inline StMagneticField*
00080 StSimpleMagneticField::instance()
00081 {
00082     if (mInstance == 0) {
00083         cerr << "StSimpleMagneticField::getInstance(): " << endl;       
00084         cerr << "\tWARNING" << endl;
00085         cerr << "\tNo arguments for instantiation of" << endl;
00086         cerr << "\tsingleton class. Zero magnetic field." << endl;
00087         mInstance = new StSimpleMagneticField;
00088     }
00089     return mInstance;   
00090 }
00091 
00092 inline const StThreeVector<double>&
00093 StSimpleMagneticField::at(const StGlobalCoordinate&) const {return mB;}
00094 
00095 inline const StThreeVector<double>&
00096 StSimpleMagneticField::at(const StThreeVector<double>&) const {return mB;}
00097 #endif