tuple_is_number — Check a tuple (of strings) whether it represents numbers.
tuple_is_number checks each element of the input tuple T whether it represents a number. If the element is a number (real or integer), 1 is returned for that element. If the element is a string, it is checked whether the string represents a number. If so, 1 is returned, otherwise 0.
If the input tuple is empty, the operator returns an empty tuple.
HDevelop provides an in-line operation for tuple_is_number, which can be used in an expression in the following syntax:
IsNumber := is_number(T)
Tuple with boolean numbers.
tuple_is_int, tuple_is_real, tuple_type