operatorPattern4MultiDimImplementation.h

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/**
 *
 *   Copyright 2005-2020 Pierre-Henri WUILLEMIN(@LIP6) & Christophe GONZALES(@AMU)
 *   info_at_agrum_dot_org
 *
 *  This library is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


/**
 * @file
 * @brief the pattern used by all binary MultiDimImplementations operators
 *
 * @author Christophe GONZALES(@AMU) and Pierre-Henri WUILLEMIN(@LIP6)
 */

// check if we allowed these patterns to be used
#ifndef GUM_OPERATOR_PATTERN_ALLOWED

// #warning To use operatorPattern4MultiDimImplementation.h, you must define
// GUM_OPERATOR_PATTERN_ALLOWED

#else

namespace gum {

#  ifdef GUM_MULTI_DIM_OPERATOR_NAME
  template < typename T >
  MultiDimImplementation< T >*
     GUM_MULTI_DIM_OPERATOR_NAME(const MultiDimImplementation< T >& impl1,
                                 const MultiDimImplementation< T >& impl2) {
#  endif

    typename OperatorRegister4MultiDim< T >::OperatorPtr func;
    bool                                                 swapped_names = false;

    // get the appropriate function to perform the operation
    try {
      // try to find +(impl1,impl2) in the register
      func = OperatorRegister4MultiDim< T >::Register().get(
         GUM_MULTI_DIM_OPERATOR_FUNC_NAME,
         impl1.name(),
         impl2.name());
    } catch (NotFound&) {

#  ifdef GUM_MULTI_DIM_SYMMETRIC_OPERATOR

      try {
        // the function could not be found but, as additions are symmetric, it
        // may be the case that +(impl2,impl1) does exist in the register.  For
        // instance, we wrote +(MultiDimArray,MultiDimSparse) but not
        // +(MultiDimSparse,MultiDimArray) and we called
        // +(MultiDimSparse,MultiDimArray)
        func = OperatorRegister4MultiDim< T >::Register().get(
           GUM_MULTI_DIM_OPERATOR_FUNC_NAME,
           impl2.name(),
           impl1.name());
        swapped_names = true;
      } catch (NotFound&) {
#  endif /* GUM_MULTI_DIM_SYMMETRIC_OPERATOR */

        func = OperatorRegister4MultiDim< T >::Register().get(
           GUM_MULTI_DIM_OPERATOR_FUNC_NAME,
           impl1.basename(),
           impl2.basename());

#  ifdef GUM_MULTI_DIM_SYMMETRIC_OPERATOR
      }

#  endif /* GUM_MULTI_DIM_SYMMETRIC_OPERATOR */
    }

    // perform the addition
    if (swapped_names)
      return func(&impl2, &impl1);
    else
      return func(&impl1, &impl2);
  }
}   // namespace gum
#endif   /* GUM_OPERATOR_PATTERN_ALLOWED */