multiDimFunctionGraphOperator.h

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 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
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#ifndef GUM_MULTI_DIM_FUNCTION_GRAPH_OPERATOR_H
#define GUM_MULTI_DIM_FUNCTION_GRAPH_OPERATOR_H
 
#include <functional>
 
#include <agrum/base/multidim/utils/FunctionGraphUtilities/operators/o4DGContext.h>
 
namespace gum {
 
  // clang-format off
  // clang-format on
 
  template < typename GUM_SCALAR,
             template < typename > class FUNCTOR,
             template < typename > class TerminalNodePolicy = ExactTerminalNodePolicy >
  class MultiDimFunctionGraphOperator {
    public:
    // ============================================================================
    // ============================================================================

    MultiDimFunctionGraphOperator(
        const MultiDimFunctionGraph< GUM_SCALAR, TerminalNodePolicy >* DG1,
        const MultiDimFunctionGraph< GUM_SCALAR, TerminalNodePolicy >* DG2);

    ~MultiDimFunctionGraphOperator();

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

    MultiDimFunctionGraph< GUM_SCALAR, TerminalNodePolicy >* compute();

 
    Idx nbCall();
    Idx nbVarRetro();
    Idx sizeVarRetroDomain();
 
    private:
    Idx _nbCall_;
    Idx _nbVarRetro_;
    Idx _sizeVarRetro_;

    void _establishVarOrder_();

    Idx _distance_(const MultiDimFunctionGraph< GUM_SCALAR, TerminalNodePolicy >*,
                   const DiscreteVariable*,
                   const DiscreteVariable*);

    void
        _findRetrogradeVariables_(const MultiDimFunctionGraph< GUM_SCALAR, TerminalNodePolicy >* dg,
                                  HashTable< NodeId, short int* >& dgInstNeed);

    NodeId _compute_(O4DGContext& currentSituation, Idx lastInstVarPos);

    const MultiDimFunctionGraph< GUM_SCALAR, TerminalNodePolicy >* _DG1_;

    const MultiDimFunctionGraph< GUM_SCALAR, TerminalNodePolicy >* _DG2_;

    MultiDimFunctionGraph< GUM_SCALAR, TerminalNodePolicy >* _rd_;

    Idx _nbVar_;

    const FUNCTOR< GUM_SCALAR > _function_;

    HashTable< double, NodeId > _explorationTable_;

    HashTable< NodeId, short int* > _DG1InstantiationNeeded_;

    HashTable< NodeId, short int* > _DG2InstantiationNeeded_;

    short int* _default_;
  };
 
#ifndef GUM_NO_EXTERN_TEMPLATE_CLASS
  extern template class MultiDimFunctionGraphOperator< double, std::plus >;
#endif
 
}   // namespace gum
 
#include <agrum/base/multidim/utils/FunctionGraphUtilities/operators/multiDimFunctionGraphOperator_tpl.h>
 
#endif   // GUM_MULTI_DIM_FUNCTION_GRAPH_OPERATOR_H