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source/externals/clhep/src/StaticRandomStates.cc

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+// $Id:$
+// -*- C++ -*-
+//
+// -----------------------------------------------------------------------
+//                             HEP Random
+//                      --- StaticRandomStates ---
+//                      class implementation file
+// -----------------------------------------------------------------------
+//
+// =======================================================================
+// Mark Fischler  - Created: Dec. 21, 2004
+// Mark Fischler  - Modified restore() to utilize anonymous engine input
+//                  to create anonymous restore of the static distributions
+//
+// =======================================================================
+
+#include "CLHEP/Random/StaticRandomStates.h"
+#include "CLHEP/Random/RandGauss.h"
+#include "CLHEP/Random/RandFlat.h"
+#include <string>
+#include <sstream>
+
+//======================//
+//                      //
+// Maintenance warning: //
+//			//
+//======================//
+//
+// Currently, only two distributions (RandFlat and RandGauss) have cached
+// distribution state.  All such distributions must be saved below, so if
+// another such distribution is added, this implementation file must be 
+// modified to reflect that.
+
+namespace CLHEP {
+
+
+std::ostream & StaticRandomStates::save(std::ostream & os){
+  RandGauss::saveFullState(os);
+  RandFlat::saveDistState(os);
+  return os;
+}
+
+#ifdef NOTYET
+std::istream & StaticRandomStates::restore(std::istream & is) {
+  RandGauss::restoreFullState(is);
+  RandFlat::restoreDistState(is);
+  return is;
+}
+#endif
+
+std::istream & StaticRandomStates::restore(std::istream & is) {
+  HepRandomEngine * e = HepRandom::getTheEngine();
+  HepRandomEngine *ne = HepRandomEngine::newEngine(is);
+  if ( !is ) return is;
+  if ( !ne ) return is;
+  if (ne->name() == e->name()) {
+    // Because e has const data members, cannot simply do *e = *ne
+    std::ostringstream os;
+    os << *ne;
+    std::istringstream istst(os.str());
+    istst >> *e;
+    if (!istst) {
+      std::cerr << "???? Unexpected behavior in StaticRandomStates::restore:\n"
+        << "The new engine, which had been input successfully from istream\n"
+	<< "has encountered a problem when used to set state of theEngine\n";
+      is.clear(std::ios::badbit | is.rdstate());
+      return is;
+    }
+  } else {
+    HepRandom::setTheEngine(ne);
+  }
+  RandGauss::restoreDistState(is);
+  RandFlat::restoreDistState(is);
+  return is;
+}
+
+}  // namespace CLHEP