completeProjectionPattern4BaseName.h

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 *       - Christophe GONZALES(_at_AMU)                                     *
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 *       - Pierre-Henri WUILLEMIN(_at_LIP6)                                 *
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// check if we allowed these patterns to be used
#ifndef GUM_COMPLETE_PROJECTION_PATTERN_ALLOWED
 
// #warning To use completeProjectionPattern, you must define
// GUM_COMPLETE_PROJECTION_PATTERN_ALLOWED
 
#else
namespace gum {
 
  // a specialized function for projecting a multiDimImplementation over a subset
  // of its variables
 
#  ifdef GUM_MULTI_DIM_COMPLETE_PROJECTION_NAME
#    define GUM_MULTI_DIM_COMPLETE_PROJECTION_TYPE GUM_ELEMENT
 
  template < typename GUM_ELEMENT >
  GUM_ELEMENT
      GUM_MULTI_DIM_COMPLETE_PROJECTION_NAME(const MultiDimImplementation< GUM_ELEMENT >* table,
                                             Instantiation* instantiation = 0)
#  endif
 
  // clang-format off
 
#ifdef GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER_NAME
#define GUM_MULTI_DIM_COMPLETE_PROJECTION_TYPE GUM_ELEMENT*
#define GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER
  template <typename GUM_ELEMENT>
  GUM_ELEMENT* GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER_NAME(
      const MultiDimImplementation<GUM_ELEMENT*>* table,
      Instantiation* instantiation = 0 )
#endif
 
#ifdef GUM_MULTI_DIM_COMPLETE_PROJECTION_NAME_F
#define GUM_MULTI_DIM_COMPLETE_PROJECTION_TYPE GUM_ELEMENT
  template <typename GUM_ELEMENT>
  GUM_ELEMENT GUM_MULTI_DIM_COMPLETE_PROJECTION_NAME_F(
      const MultiDimImplementation<GUM_ELEMENT>* table,
      GUM_ELEMENT ( *f )( const GUM_ELEMENT&, const GUM_ELEMENT& ),
      Instantiation* instantiation = 0 )
#endif
 
#ifdef GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER_NAME_F
#define GUM_MULTI_DIM_COMPLETE_PROJECTION_TYPE GUM_ELEMENT*
#define GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER
  template <typename GUM_ELEMENT>
  GUM_ELEMENT* GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER_NAME_F(
      const MultiDimImplementation<GUM_ELEMENT*>* table,
      GUM_ELEMENT* ( *f )(const GUM_ELEMENT const*,
        const GUM_ELEMENT const*))
#endif
 
  // clang-format on
 
  {
 
#  ifdef GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER_NAME_F
    Instantiation* instantiation = 0;
#  endif   // GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER_NAME_F
 
    // first, compute the domain size of the table:
    Size nb_elt = table->domainSize();
 
    // now, parse the table and compute the projection. Start with the
    // neutral element
    // TODO: change into Instantiation table_inst(table); when Tensors will support
    // thread-safe creations of Instantiations
    Instantiation table_inst;
    for (const auto var: table->variablesSequence())
      table_inst.add(*var);
    GUM_ELEMENT current_val = GUM_MULTI_DIM_COMPLETE_PROJECTION_NEUTRAL;
 
    if (instantiation) {
      GUM_ELEMENT old_val     = current_val;
      Size        current_ptr = 0;
 
      for (Size i = 0; i < nb_elt; ++i, ++table_inst) {
#  ifdef GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER
        GUM_MULTI_DIM_COMPLETE_PROJECTION(&current_val, table->get(table_inst));
#  else
        GUM_MULTI_DIM_COMPLETE_PROJECTION(current_val, table->get(table_inst));
#  endif   // GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER
 
        if (current_val != old_val) {
          old_val     = current_val;
          current_ptr = i;
        }
      }
 
      // put the table's variables into the instantiation
      instantiation->forgetMaster();
      instantiation->clear();
      const Sequence< const DiscreteVariable* >& table_vars = table->variablesSequence();
 
      for (const auto var: table_vars)
        instantiation->add(*var);
 
      // return the result
      instantiation->operator+=(current_ptr);
      return table->get(*instantiation);
    } else {
#  ifdef GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER
      GUM_ELEMENT old_val     = current_val;
      Size        current_ptr = 0;
 
      for (Size i = 0; i < nb_elt; ++i, ++table_inst) {
        GUM_MULTI_DIM_COMPLETE_PROJECTION(&current_val, table->get(table_inst));
 
        if (current_val != old_val) {
          old_val     = current_val;
          current_ptr = i;
        }
      }
 
      table_inst.setFirst();
      table_inst += current_ptr return table->get(table_inst);
#  else
 
      for (Size i = 0; i < nb_elt; ++i, ++table_inst) {
        GUM_MULTI_DIM_COMPLETE_PROJECTION(current_val, table->get(table_inst));
      }
 
      return current_val;
#  endif   /* GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER */
    }
  }
 
#  undef GUM_MULTI_DIM_COMPLETE_PROJECTION_TYPE
 
#  ifdef GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER
#    undef GUM_MULTI_DIM_COMPLETE_PROJECTION_POINTER
#  endif
 
} /* End of namespace gum */
 
#endif /* GUM_COMPLETE_PROJECTION_PATTERN_ALLOWED */