operatorPattern4MultiDimImplementation.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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// 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 const&) {
 
#  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 const&) {
#  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 */