.. py:function:: create_case(selector, cases, default = None)

   
   Return the expression tree for the case operator.


   :Parameters:

       **selector** : :obj:`EX`
           Expression tree corresponding to the selector.

       **cases** : :obj:`List`\[:obj:`Tuple`\[:obj:`EX`, :obj:`EX`]]
           Pattern/values expression trees.

       **default: EX, default:None**
           Default value.

   :Returns:

       :obj:`ET`
           ..








   .. rubric:: Notes

   This is an interface change with respect to the *SCADE Creation Library*.
   The pairs "pattern"/"value" are now embedded in a list of tuples, and the
   default value is optional.





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