multiDimProjection_tpl.h

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 *   Copyright (c) 2005-2025 by                                             *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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 *   SPDX-FileCopyrightText: Copyright 2005-2025                            *
 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
 *       - Christophe GONZALES(_at_AMU)                                     *
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#pragma once
 

 
#ifndef DOXYGEN_SHOULD_SKIP_THIS
 
#  include <limits>
 
#  include <agrum/agrum.h>
 
namespace gum {

  template < class TABLE >
  MultiDimProjection< TABLE >::MultiDimProjection(TABLE (*proj)(const TABLE&,
                                                                const gum::VariableSet&)) :
      proj_(proj) {
    // for debugging purposes
    GUM_CONSTRUCTOR(MultiDimProjection);
  }

  template < class TABLE >
  MultiDimProjection< TABLE >::MultiDimProjection(const MultiDimProjection< TABLE >& from) :
      proj_(from.proj_) {
    // for debugging purposes
    GUM_CONS_CPY(MultiDimProjection);
  }

  template < class TABLE >
  MultiDimProjection< TABLE >::~MultiDimProjection() {
    // for debugging purposes
    GUM_DESTRUCTOR(MultiDimProjection);
  }

  template < class TABLE >
  MultiDimProjection< TABLE >* MultiDimProjection< TABLE >::clone() const {
    return new MultiDimProjection< TABLE >(*this);
  }

  template < class TABLE >
  INLINE TABLE* MultiDimProjection< TABLE >::execute(const TABLE&            table,
                                                     const gum::VariableSet& del_vars) const {
    // projected constants are equal to the same constant
    if (table.variablesSequence().empty()) return new TABLE(table);
    else return new TABLE(proj_(table, del_vars));
  }

  template < class TABLE >
  INLINE void MultiDimProjection< TABLE >::execute(TABLE&                  container,
                                                   const TABLE&            table,
                                                   const gum::VariableSet& del_vars) const {
    if (table.variablesSequence().empty()) container = table;
    else container = proj_(table, del_vars);
  }

  template < class TABLE >
  std::pair< ScheduleOperator*, const IScheduleMultiDim* >
      MultiDimProjection< TABLE >::operations(const IScheduleMultiDim* table,
                                              const gum::VariableSet&  del_vars,
                                              const bool               is_result_persistent) const {
    auto op
        = new ScheduleProjection< TABLE >(dynamic_cast< const ScheduleMultiDim< TABLE >& >(*table),
                                          del_vars,
                                          proj_,
                                          is_result_persistent);
    return {op, &op->result()};
  }

  template < class TABLE >
  INLINE const IScheduleMultiDim*
      MultiDimProjection< TABLE >::schedule(Schedule&                schedule,
                                            const IScheduleMultiDim* table,
                                            const gum::VariableSet&  del_vars,
                                            const bool               is_result_persistent) const {
    const auto& xtable = dynamic_cast< const ScheduleMultiDim< TABLE >& >(*table);
    const auto& op     = schedule.emplaceProjection(xtable, del_vars, proj_, is_result_persistent);
    return op.results()[0];
  }

  template < class TABLE >
  void MultiDimProjection< TABLE >::setProjectionFunction(TABLE (*proj)(const TABLE&,
                                                                        const gum::VariableSet&)) {
    proj_ = proj;
  }

  template < class TABLE >
  INLINE TABLE (*MultiDimProjection< TABLE >::projectionFunction())(const TABLE&,
                                                                    const gum::VariableSet&) {
    return proj_;
  }

  template < class TABLE >
  INLINE double MultiDimProjection< TABLE >::nbOperations(const TABLE&            table,
                                                          const gum::VariableSet& del_vars) const {
    return double(table.domainSize());
  }

  template < class TABLE >
  INLINE double
      MultiDimProjection< TABLE >::nbOperations(const Sequence< const DiscreteVariable* >& vars,
                                                const gum::VariableSet& del_vars) const {
    double res = 1.0;
    for (const auto var: vars) {
      res *= double(var->domainSize());
    }
    return res;
  }

  template < class TABLE >
  INLINE std::pair< double, double >
         MultiDimProjection< TABLE >::memoryUsage(const Sequence< const DiscreteVariable* >& vars,
                                               const gum::VariableSet& del_vars) const {
    auto res = double(sizeof(value_type));
 
    for (const auto var: vars) {
      if (!del_vars.contains(var)) res *= double(var->domainSize());
    }
 
    res += double(sizeof(TABLE));
    return {res, res};
  }

  template < class TABLE >
  INLINE std::pair< double, double >
         MultiDimProjection< TABLE >::memoryUsage(const TABLE&            table,
                                               const gum::VariableSet& del_vars) const {
    return memoryUsage(table.variablesSequence(), del_vars);
  }
 
} /* namespace gum */
 
#endif /* DOXYGEN_SHOULD_SKIP_THIS */