code: protected int findFunctionInputDef( String name)
      {
      int functionCount = name==null? 0 : functionInputDefs_.size();
      int i;
      for( i = 0; i < functionCount && !name.equals( functionInputDefs_.get(i).getName()); i++);
      return i < functionCount? i : -1;
      }
docs: Returns the index of the function definition with the given name.