abstractSimulator.cpp

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// =====================================================================
#include <cstdlib>
#include <random>
//======================================================================
#include <agrum/FMDP/simulation/abstractSimulator.h>
//======================================================================

namespace gum {

  // ===========================================================================
  // Constructors, Destructors.
  // ===========================================================================

  /*
   * Default constructor.
   */
  AbstractSimulator::AbstractSimulator() { GUM_CONSTRUCTOR(AbstractSimulator); }

  /*
   * Default destructor.
   */
  AbstractSimulator::~AbstractSimulator() { GUM_DESTRUCTOR(AbstractSimulator); }


  // ===========================================================================
  //
  // ===========================================================================

  void AbstractSimulator::setInitialStateRandomly() {
    bool hre = true;
    while (hre) {
      _currentState = _randomState();
      hre = hasReachEnd();
    }
  }

  Instantiation AbstractSimulator::_randomState() {
    Instantiation retState;
    for (auto varIter = this->beginVariables(); varIter != this->endVariables();
         ++varIter) {
      retState.add(**varIter);
      retState.chgVal(*varIter,
                      (Idx)(((double)std::rand() / (double)RAND_MAX)
                            * (double)(*varIter)->domainSize()));
    }
    return retState;
  }

  bool AbstractSimulator::hasReachEnd() {
    if (_endState.empty()) return false;

    for (auto varIter = _endState.variablesSequence().beginSafe();
         varIter != _endState.variablesSequence().endSafe();
         ++varIter)
      if (_endState.val(**varIter) != _currentState.val(**varIter)) return false;
    return true;
  }


}   // End of namespace gum