mi_integer mi_func_isvariant(funcdesc_ptr)
   MI_FUNC_DESC *funcdesc_ptr;

funcdesc_ptr

is a pointer to a function descriptor for a user-defined function.

Valid in Client LIBMI Application?	Valid in User-Defined Routine?
No	Yes

The mi_func_isvariant( ) function determines whether the user-defined function associated with the funcdesc_ptr function descriptor is variant or nonvariant. A user-defined function is variant if it behaves in either of the following ways:

• Returns different results when it is invoked with the same arguments
• Modifies a database or variable state

You can register a user-defined function as variant with the VARIANT routine modifier. If you do not specify the VARIANT or NOT VARIANT routine modifier with the CREATE FUNCTION statement, the user-defined function is variant.

The mi_func_isvariant( ) function is one of the functions of the Fastpath interface.

1

indicates that the UDR that the funcdesc_ptr function descriptor identifies is variant.

2

indicates that the UDR that the funcdesc_ptr function descriptor identifies is not variant.

MI_ERROR

indicates that the function was not successful.

See also the descriptions of mi_cast_get( ), mi_fparam_get( ), mi_func_commutator( ), mi_func_handlesnulls( ), mi_func_negator( ), mi_routine_get( ), mi_routine_get_by_typeid( ), mi_routine_id_get( ), and mi_td_cast_get( ).