EXPAND
|
|
dynamic-clause |
|
[GIVING
operand5]
|
| array-clause |
This document covers the following topics:
For an explanation of the symbols used in the syntax diagram, see Syntax Symbols.
Related statements: REDUCE | RESIZE
Belongs to Function Group: Memory Management Control for Dynamic Variables or X-Arrays
The EXPAND statement is used to expand:
the allocated length of a dynamic variable (dynamic-clause), or
the number of occurrences of X-arrays (array-clause).
For further information, see the following sections in the Programming Guide:
Allocating/Freeing Memory Space for a Dynamic Variable
Storage Management of X-Group Arrays
Operand Definition Table:
| Operand | Possible Structure | Possible Formats | Referencing Permitted | Dynamic Definition | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| operand1 | S | A | A | U | B | no | no | ||||||||||||||
| operand2 | C | S | I | no | no | ||||||||||||||||
| operand3 | A | G | A | U | N | P | I | F | B | D | T | L | C | G | O | yes | no | ||||
| operand4 | C | S | N | P | I | no | no | ||||||||||||||
| operand5 | S | I4 | no | yes | |||||||||||||||||
Syntax Element Description:
| dynamic-clause | The EXPAND DYNAMIC VARIABLE statement expands the
allocated length of a dynamic variable (operand1) to
the value specified with operand2. For more
information, see Dynamic
Clause below.
|
|---|---|
| operand1 | operand1 is the dynamic variable for which the size is to be expanded. |
| operand2 | operand2 is used to specify the length to which the dynamic variable is to be expanded. The value specified must be a non-negative integer constant or a variable of type Integer4 (I4). |
| array-clause | The EXPAND ARRAY statement increases the number of
occurrences of the X-array (operand3) to the upper
and lower bound specified with (dim[,dim[,dim]]).
For more information, see Array Clause
below.
|
| operand3 | operand3 is the X-array for which the number of occurrences may be increased. The index notation of the array is optional. As index notation only the complete range notation * is allowed for each dimension. |
|
dim
operand4 |
The lower and upper bound notation (operand4 or asterisk) to which the X-array should be expanded is specified here. If the current value of the upper or lower bound should be used, an asterisk (*) may be specified in place of operand4. For more information, see Dimension below. |
| GIVING operand5 | If the GIVING clause is not specified, Natural
runtime error processing is triggered if an error occurs.
If the |
[SIZE OF] DYNAMIC [VARIABLE] operand1
TO operand2
|
The EXPAND DYNAMIC VARIABLE statement expands the
allocated size of a dynamic variable (operand1) to
the value specified with operand2.
If operand2 is less than the currently
allocated length of operand1, the statement will be
ignored for this dynamic variable. The currently allocated length (*LENGTH)
of the dynamic variable is not modified.
[AND RESET [OCCURRENCES OF] ARRAY
operand3 TO
(dim[,dim
[,dim]])]
|
The EXPAND ARRAY statement increases the number of
occurrences of the X-array
(operand3) to the upper and lower bound specified
with TO (dim
[,dim[,dim]]).
The RESET option resets all occurrences of the resized
X-array to its default zero value. By default (no RESET option),
the actual values are kept and the resized (new) occurrences are reset.
When using the EXPAND statement, it is only possible to
increase the number of occurrences. If the requested number is smaller than the
currently allocated number of occurrences, it will simply be ignored.
An upper or lower bound used in an EXPAND statement must
be exactly the same as the corresponding upper or lower bound defined for the
array.
Example:
DEFINE DATA LOCAL
1 #a(I4/1:*)
1 #g(1:*)
2 #ga(I4/1:*)
1 #i(i4)
END-DEFINE
...
/* allocating #a(1:10)
EXPAND ARRAY #a TO (1:10) /* #a is allocated 10
EXPAND ARRAY #a TO (*:10) /* occurrences.
/* allocating #ga(1:10,1:20)
EXPAND ARRAY #g TO (1:10) /* 1st dimension is set to (1:10)
EXPAND ARRAY #ga TO (*:*,1:20) /* 1st dimension is dependent and
/* therefore kept with (*:*)
/* 2nd dimension is set to (1:20)
EXPAND ARRAY #a TO (5:10) /* This is rejected because the lower index
/* must be 1 or *
EXPAND ARRAY #a TO (#i:10) /* This is rejected because the lower index
/* must be 1 or *
EXPAND ARRAY #ga TO (1:10,1:20) /* (1:10) for the 1st dimension is rejected
/* because the dimension is dependent and
/* must be specified with (*:*).
For further information, see
Each of the dimensions (dim) specified in the Array Clause is defined using the following syntax:
|
|
operand4 |
|
:
|
|
operand4 |
|
| * | * |
The lower and upper bound notation (operand4
or asterisk) to which the X-array should be expanded is
specified here. If the current value of the upper or lower bound should be
used, an asterisk (*) may be specified place of
operand4. Instead of *:*, you may also
specify a single asterisk.
The number of dimensions (dim) must exactly match the
defined number of dimensions of the X-array (1, 2 or 3).
If the number of occurrences for a specified dimension is less than the number of the currently allocated occurrences, the number of occurrences is not changed for the corresponding dimension.