ARRAYATTR function

Purpose

Return descriptive attributes of a given array.

Syntax

y = ARRAYATTR(Arr(), AttrNum)

Remarks

ARRAYATTR returns various descriptive attributes of an array, depending upon the value of AttrNum

AttrNum

Definition

     0

Returns TRUE (-1) if the array is currently dimensioned, FALSE (0) if not.

     1

Returns the data type, as defined in the following table.  Note that the numeric equates listed on the right of the table are built into PowerBASIC, but the numeric values they represent are subject to change.  Therefore, application code should always use the numeric equates rather than the numeric value, to ensure compatibility with future versions of PowerBASIC.  The current data type definitions are:

 

Type

Array type

Keyword

Equate

 

0

Byte

BYTE

%VARCLASS_BYT

 

1

Word

WORD

%VARCLASS_WRD

 

2

Double-word

DWORD

%VARCLASS_DWD

 

4

Integer

INTEGER

%VARCLASS_INT

 

5

Long-integer

LONG

%VARCLASS_LNG

 

6

Unsigned Bit

n/a

%VARCLASS_BIT

 

7

Signed bit

n/a

%VARCLASS_SBT

 

8

Quad-integer

QUAD

%VARCLASS_QUD

 

10

Single-precision

SINGLE

%VARCLASS_SNG

 

11

Double-precision

DOUBLE

%VARCLASS_DBL

 

12

Extended-precision

EXT

%VARCLASS_EXT

 

13

Currency

CURRENCY

%VARCLASS_CUR

 

14

Extended Currency

CURRENCYX

%VARCLASS_CUX

 

17

Variant

VARIANT

%VARCLASS_VRNT

 

18

Interface

INTERFACE

%VARCLASS_IFAC

 

19

GUID

GUID

%VARCLASS_GUID

 

20

UDT or Union

TYPE/UNION

%VARCLASS_TYPE

 

21

ASCIIZ string

ASCIIZ/ASCIZ

%VARCLASS_ASC

 

22

Fixed-length string

STRING * n

%VARCLASS_FIX

 

23

Dynamic string

STRING

%VARCLASS_STR

 

24

Field string

FIELD

%VARCLASS_FLD

 

    2

Returns TRUE (-1) if it is an array of pointers, FALSE (0) if not.

 

    3

Returns the number of dimensions of the array.  The lower and upper boundaries of each dimension can be retrieved with the LBOUND and UBOUND functions respectively

 

    4

Returns the total number of elements in the array.  For example, the array DIM A&(3,4,5) would comprise 120 elements (4 x 5 x 6 = 120).

 

    5

Returns the array element size.  For example, an array of Double-precision variables would be 8 bytes.  For dynamic strings, the size of the string handle (4 bytes) is returned.  For DISPATCH and INTERFACE arrays, ARRAYATTR returns the size of a pointer variable (4 bytes).

See also

DIM, LBOUND, UBOUND, REDIM

Example

DIM z(3,4,5) AS CURRENCYX

DIM x AS LONG, Answer AS STRING

FOR x = 0 TO 5

  Answer = Answer + FORMAT$(x)

  Answer = Answer + $TAB

  Answer = Answer + FORMAT$(ARRAYATTR(z(),x))

  Answer = Answer + $CRLF

NEXT x

' The results are stored in Answer:

Result

0       -1

1       14

2       0

3       3

4       120

5       8