Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/externals/clhep/src/StaticRandomStates.cc

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  1 // -*- C++ -*-
  2 //
  3 // -----------------------------------------------------------------------
  4 //                             HEP Random
  5 //                      --- StaticRandomStates ---
  6 //                      class implementation file
  7 // -----------------------------------------------------------------------
  8 //
  9 // =======================================================================
 10 // Mark Fischler  - Created: Dec. 21, 2004
 11 // Mark Fischler  - Modified restore() to utilize anonymous engine input
 12 //                  to create anonymous restore of the static distributions
 13 //
 14 // =======================================================================
 15 
 16 #include "CLHEP/Random/StaticRandomStates.h"
 17 #include "CLHEP/Random/RandGauss.h"
 18 #include "CLHEP/Random/RandFlat.h"
 19 #include <iostream>
 20 #include <string>
 21 #include <sstream>
 22 
 23 //======================//
 24 //                      //
 25 // Maintenance warning: //
 26 //      //
 27 //======================//
 28 //
 29 // Currently, only two distributions (RandFlat and RandGauss) have cached
 30 // distribution state.  All such distributions must be saved below, so if
 31 // another such distribution is added, this implementation file must be 
 32 // modified to reflect that.
 33 
 34 namespace CLHEP {
 35 
 36 
 37 std::ostream & StaticRandomStates::save(std::ostream & os){
 38   RandGauss::saveFullState(os);
 39   RandFlat::saveDistState(os);
 40   return os;
 41 }
 42 
 43 #ifdef NOTYET
 44 std::istream & StaticRandomStates::restore(std::istream & is) {
 45   RandGauss::restoreFullState(is);
 46   RandFlat::restoreDistState(is);
 47   return is;
 48 }
 49 #endif
 50 
 51 std::istream & StaticRandomStates::restore(std::istream & is) {
 52   HepRandomEngine * e = HepRandom::getTheEngine();
 53   HepRandomEngine *ne = HepRandomEngine::newEngine(is);
 54   if ( !is ) return is;
 55   if ( !ne ) return is;
 56   if (ne->name() == e->name()) {
 57     // Because e has const data members, cannot simply do *e = *ne
 58     std::ostringstream os;
 59     os << *ne;
 60     std::istringstream istst(os.str());
 61     istst >> *e;
 62     if (!istst) {
 63       std::cerr << "???? Unexpected behavior in StaticRandomStates::restore:\n"
 64         << "The new engine, which had been input successfully from istream\n"
 65   << "has encountered a problem when used to set state of theEngine\n";
 66       is.clear(std::ios::badbit | is.rdstate());
 67       return is;
 68     }
 69   } else {
 70     HepRandom::setTheEngine(ne);
 71   }
 72   RandGauss::restoreDistState(is);
 73   RandFlat::restoreDistState(is);
 74   return is;
 75 }
 76 
 77 }  // namespace CLHEP
 78