operatorPattern4MultiDimImplementation.h

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// 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 */