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midrange.com
Colin,
Here is a generic program I use as a template when I'm building
applications
with dynamic arrays.
FYI: When a ReAlloc is performed, "new" storage on the heap is allocated.
The "new" storage is initialized by the "old" storage. The "old"
storage is then released.
The final amount of storage used is released with a DeAlloc or
when the activation group dies.
I hope it is what your looking for. I'd be glad to help if you have any
questions.
Dave
0000.01 *#########################################*
0000.02 * Constants
*
0000.03 *#########################################*
0042.15
0042.18 * The size of an element in the array.
0042.19 D ArrayElmSize C %Size(ArrayElm)
0042.20
0042.21 * The # of elements by which the array will be incremented
0042.22 * each time memory is allocated.
0042.23 D ArrayIncAmt C 5
0042.24
0042.25 *############################*
0042.26 * Data Structures *
0042.27 *############################*
0042.29
0042.30 *#######################################################*
0042.31 * Because the array is based, the compiler reserves no space
*
0042.32 * for it at all and assumes you know what you are doing with
*
0042.33 * the pointer ArrayPtr.
*
0042.34 * If a variable is based, it means that it doesn't have any memory
*
0042.35 * dedicated to it - it isn't fixed at a specific address.
*
0042.36 * It will be at wherever its 'basing pointer' is set to.
*
0042.37 *#######################################################*
0000.01 *##########################################*
0000.02 * Constants
*
0000.03 *##########################################*
0042.15
0042.18 * The size of an element in the array.
0042.19 D ArrayElmSize C %Size(ArrayElm)
0042.20
0042.21 * The # of elements by which the array will be incremented
0042.22 * each time memory is allocated.
0042.23 D ArrayIncAmt C 5
0042.24
0042.25 *###########################################*
0042.26 * Data Structures
*
0042.27 *###########################################*
0042.29
0042.30 *#######################################################*
0042.31 * Because the array is based, the compiler reserves no space
*
0042.32 * for it at all and assumes you know what you are doing with
*
0042.33 * the pointer ArrayPtr.
*
0042.34 * If a variable is based, it means that it doesn't have any memory
*
0042.35 * dedicated to it - it isn't fixed at a specific address.
*
0042.36 * It will be at wherever its 'basing pointer' is set to.
*
0042.37 *######################################################*
0042.38 D ArrayElm DS
0042.40 D Name 25
0042.41 D Address 25
0042.42
0042.43 *############################################*
0042.44 * StandAlone Fields
*
0042.45 *############################################*
0042.46
0042.47 D Array S Like(ArrayElm) Dim(32767)
0042.48 D Based(ArrayPtr)
0042.49
0042.52 * The current # of elements in the array.
0042.53 D Array#ofElm S 10 0
0042.54
0042.56 * The array index.
0042.57 D ArrayIndex S 5 0
0042.58
0042.59 * The index of the last element of the array.
0042.60 D ArrayLastElm S 5 0
0042.61
0042.62 * The current # of elements in the array.
0042.63 D ArrayPtr S *
0042.64
0042.65 * The current # of bytes of storage allocated to the array.
0042.66 D ArrayStorage S 10 0
0042.67
0059.03
0059.04 *##############################################*
0059.05 * Allocate initial storage for the array.
*
0059.06 *##############################################*
0059.07 C Eval ArrayLastElm = 0
0059.08 C Eval ArrayPtr = *Null
0059.09 C Eval Array#ofElm = ArrayIncAmt
0059.10 C Eval ArrayStorage = Array#ofElm *
ArrayElmSize
0059.11 C Alloc ArrayStorage ArrayPtr
0059.12
0059.19 C Do 32767
0059.20
0059.21 C If ArrayLastElm = Array#ofElm
0059.22 C Eval Array#ofElm = Array#ofElm +
ArrayIncAmt
0059.23 C Eval ArrayStorage = Array#ofElm *
ArrayElmSize
0059.24 C ReAlloc ArrayStorage ArrayPtr
0059.26 C EndIf
0059.28
0059.29 C Eval ArrayLastElm = ArrayLastElm + 1
0059.30 C Eval Array(ArrayLastElm) = 'Who Cares'
0059.31 C Eval %Subst(Array(ArrayLastElm):25) = '123
Main Street'
0059.35 C EndDo
0059.36
0097.00 C Eval *INLR = *ON
0097.01
****************** End of data
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