count.h

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 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
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#ifndef GUM_COUNT_AGGREGATOR_H
#define GUM_COUNT_AGGREGATOR_H
 
#include <agrum/base/multidim/aggregators/multiDimAggregator.h>
 
namespace gum {
 
  namespace aggregator {
    // =========================================================================
    // ===                     GUM_MAX_AGGREGATOR                            ===
    // =========================================================================

    template < GUM_Numeric GUM_SCALAR >
    class Count final: public MultiDimAggregator< GUM_SCALAR > {
      public:
      Count(Idx value);
      Count(const Count< GUM_SCALAR >& from);
      ~Count() override;
 
      std::string           aggregatorName() const override;
      std::optional< Idx >  value() const override;

      [[nodiscard]] MultiDimContainer< GUM_SCALAR >* newFactory() const override;
 
      protected:
      Idx neutralElt_() const override;
      Idx fold_(const DiscreteVariable& v, Idx i1, Idx i2, bool& stop_iteration) const override;
 
      private:
      Idx _value_;
    };
 
 
#ifndef GUM_NO_EXTERN_TEMPLATE_CLASS
    extern template class Count< double >;
#endif
 
 
  }   // namespace aggregator
}   // namespace gum
 
#include <agrum/base/multidim/aggregators/count_tpl.h>
 
#endif   // GUM_COUNT_AGGREGATOR_H