multiDimAggregator_tpl.h

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 *       - Christophe GONZALES(_at_AMU)                                     *
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 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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#pragma once
 

 
// to ease parser in IDEs
#include <agrum/base/multidim/aggregators/multiDimAggregator.h>
 
namespace gum {
  namespace aggregator {
 
    // Default constructor
    template < typename GUM_SCALAR >
    INLINE MultiDimAggregator< GUM_SCALAR >::MultiDimAggregator() :
        MultiDimReadOnly< GUM_SCALAR >(), decomposable_(false) {
      GUM_CONSTRUCTOR(MultiDimAggregator);
    }
 
    // Default constructor
    template < typename GUM_SCALAR >
    INLINE MultiDimAggregator< GUM_SCALAR >::MultiDimAggregator(
        const MultiDimAggregator< GUM_SCALAR >& from) :
        MultiDimReadOnly< GUM_SCALAR >(from), decomposable_(from.decomposable_) {
      GUM_CONS_CPY(MultiDimAggregator);
    }
 
    // destructor
    template < typename GUM_SCALAR >
    INLINE MultiDimAggregator< GUM_SCALAR >::~MultiDimAggregator() {
      GUM_DESTRUCTOR(MultiDimAggregator);
    }
 
    template < typename GUM_SCALAR >
    Idx MultiDimAggregator< GUM_SCALAR >::buildValue_(const Instantiation& i) const {
      if (this->nbrDim() == 1) return neutralElt_();
 
      // is i equal to f(f(f(f...(j_,neutral_elt))))
      Idx current = neutralElt_();
 
      bool stop_iteration = false;
 
      for (Idx j = 1; j < this->nbrDim(); j++) {
        current = fold_(this->variable(j), i.val(this->variable(j)), current, stop_iteration);
 
        if (stop_iteration) break;
      }
 
      return current;
    }
 
    template < typename GUM_SCALAR >
    GUM_SCALAR MultiDimAggregator< GUM_SCALAR >::get(const Instantiation& i) const {
      if (this->nbrDim() < 1) {
        GUM_ERROR(OperationNotAllowed, "Not enough variable for an aggregator : " << *this)
      }
 
      const DiscreteVariable& agg     = this->variable((Idx)0);
      auto                    current = buildValue_(i);
 
      // truncate to fit in aggreegator domain size
      if (current >= agg.domainSize()) current = agg.domainSize() - 1;
 
      return (i.val(agg) == current) ? (GUM_SCALAR)1.0 : (GUM_SCALAR)0.0;
    }
 
    template < typename GUM_SCALAR >
    std::string MultiDimAggregator< GUM_SCALAR >::toString() const {
      std::stringstream s;
      s << this->variable(0) << "=" << aggregatorName() << "(";
 
      for (Idx i = 1; i < this->nbrDim(); i++) {
        if (i > 1) s << ",";
 
        s << this->variable(i);
      }
 
      s << ")";
 
      return s.str();
    }
 
    template < typename GUM_SCALAR >
    void MultiDimAggregator< GUM_SCALAR >::copyFrom(
        const MultiDimContainer< GUM_SCALAR >& src) const {
      auto p = dynamic_cast< const MultiDimAggregator< GUM_SCALAR >* >(&src);
      if (p == nullptr) {
        MultiDimReadOnly< GUM_SCALAR >::copyFrom(src);
      } else {
        if (p->name() != this->name()) {
          GUM_ERROR(OperationNotAllowed,
                    "Can not copy from a " << p->name() << " to a " << this->name());
        }
      }
      // it the types aree consistant, nothing to do...
    }
 
    template < typename GUM_SCALAR >
    INLINE bool MultiDimAggregator< GUM_SCALAR >::isDecomposable() const {
      return decomposable_;
    }
 
    // returns the name of the implementation
    template < typename GUM_SCALAR >
    const std::string& MultiDimAggregator< GUM_SCALAR >::name() const {
      static const std::string str = "MultiDimAggregator";
      return str;
    }
 
    // For friendly displaying the content of the variable.
    template < typename GUM_SCALAR >
    INLINE std::ostream& operator<<(std::ostream& s, const MultiDimAggregator< GUM_SCALAR >& ag) {
      return s << ag.toString();
    }
  } /* namespace aggregator */
} /* namespace gum */