multiDimAggregator.h

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 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
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#ifndef GUM_MULTI_DIM_AGGREGATOR_H
#define GUM_MULTI_DIM_AGGREGATOR_H
 
#include <optional>
 
#include <agrum/base/multidim/implementations/multiDimReadOnly.h>
 
namespace gum {
  namespace aggregator {
    // =========================================================================
    // ===                       GUM_MULTI_DIM_AGGREGATOR                    ===
    // =========================================================================

    template < typename GUM_ELEMENT >
    class MultiDimAggregator: public MultiDimReadOnly< GUM_ELEMENT > {
      public:
      // =======================================================================
      // =======================================================================

      MultiDimAggregator();

      MultiDimAggregator(const MultiDimAggregator< GUM_ELEMENT >& from);

      ~MultiDimAggregator() override;


      [[nodiscard]] MultiDimContainer< GUM_ELEMENT >* newFactory() const override = 0;
 
      // =======================================================================
      // =======================================================================
 
      public:
      GUM_ELEMENT get(const Instantiation& i) const override;
 
      virtual std::string aggregatorName() const = 0;

      virtual std::optional< Idx > value() const;
      std::string                  toString() const override;
 
      void changeNotification(const gum::Instantiation&,
                              const gum::DiscreteVariable* const,
                              gum::Idx,
                              gum::Idx) override;
 
      void setFirstNotification(const gum::Instantiation&) override;
 
      void setLastNotification(const gum::Instantiation&) override;
 
      void setIncNotification(const gum::Instantiation&) override;
 
      void setDecNotification(const gum::Instantiation&) override;
 
      void setChangeNotification(const gum::Instantiation&) override;
 
      std::string toString(const gum::Instantiation* i) const override;

      Size realSize() const override;

      const std::string& name() const override;

      void copyFrom(const MultiDimContainer< GUM_ELEMENT >& src) const override;

      bool isDecomposable() const;

 
      protected:
      virtual Idx buildValue_(const gum::Instantiation& i) const;

      bool decomposable_;

      virtual Idx neutralElt_() const = 0;

      virtual Idx fold_(const DiscreteVariable& v, Idx i1, Idx i2, bool& stop_iteration) const = 0;
    };
 
 
#ifndef GUM_NO_EXTERN_TEMPLATE_CLASS
    extern template class GUM_SHARED_PUBLIC MultiDimAggregator< double >;
#endif

    template < typename GUM_ELEMENT >
    std::ostream& operator<<(std::ostream& s, const MultiDimAggregator< GUM_ELEMENT >& ag);
 
  } /* namespace aggregator */
} /* namespace gum */
 
#include <agrum/base/multidim/aggregators/multiDimAggregator_tpl.h>
 
#endif /* GUM_MULTI_DIM_AGGREGATOR_H */