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