tuple_is_string
— Test if the internal representation of a tuple is of type string
.
tuple_is_string
tests if the internal representation of the
input tuple T
is of type string
. In that case
the value 1 (true) is returned in IsString
, otherwise the value
0 (false) is returned. If a tuple consists of string
elements only,
IsString
can nevertheless be 0 in case the internal representation
is H_TYPE_MIXED; see tuple_type
for details.
If the input tuple is empty, the operator returns 1.
HDevelop provides an in-line operation for tuple_is_string
,
which can be used in an expression in the following syntax:
Even if all tuple elements are of type string
,
tuple_is_string
returns 0 (false) if the internal representation
of the tuple is of type H_TYPE_MIXED. To test if the elements of the
tuple are of type string
the operator tuple_is_string_elem
should be used.
T
(input_control) tuple(-array) →
(string / real / integer / handle)
Input tuple.
IsString
(output_control) number →
(integer)
Is the input tuple of type string
?
tuple_is_string ([3.1416,'pi',3], IsStringA) * IsStringA = false tuple_is_string (['a','b','111'], IsStringB) * IsStringB = true tuple_is_string ([], IsStringC) * IsStringC = true
If the parameters are valid, the operator
tuple_is_string
returns the value 2 (H_MSG_TRUE).
tuple_type
,
tuple_is_number
,
tuple_is_string_elem
tuple_is_int
,
tuple_is_real
,
tuple_is_handle
Foundation