| Ptr_Wrapper (Useful?) [message #41701] |
Tue, 23 November 2004 08:01  |
gambler_1650
Messages: 5
Registered: November 2004
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Junior Member |
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Greetings all. One of the first pieces of 'useful' code I wrote was
an object that encapsulates pointer creation and deletion. It's a
piece of simple code that utilizes David Fanning's "linkedlist".
Everytime a pointer is created using the object, it's attached to a
linked list. When the object is destroyed, the linked list is unwound
and each pointer in the list is freed. There is also an explicit
"free_ptrs" routine that allows destruction to be more controlled.
The simplest way of using it is to create one ptr_wrapper object in
each *.pro file and destroy it at the end. If you prefer to have
different wrappers, each of which maintains its pointers for more
specialized time frames for better efficiency, you can do that too.
And finally, you can create and free pointers using the object
methods just as you would normally in IDL.
Quick example:
PRO testptrs
oPtr_Wrapper = Obj_New('ptr_wrapper')
ptrA = oPtr_Wrapper->Ptr_New(/ALLOCATE_HEAP) ; Uses same keywords
as Ptr_New
.
.
.
ptrB = oPtr_Wrapper->Ptr_New(/ALLOCATE_HEAP)
.
.
.
Obj_Destroy, oPtr_Wrapper
END
This bit of code is obviously simplistic and using the wrapper here
would be wasteful. I've found it to be much more useful in objects
where pointers are created in different routines. Each can be
assigned to self.oPtr_Wrapper and then self.oPtr_Wrapper can be
destroyed in the cleanup routine...
If there's interest in the code, I'll be happy to e-mail the file or
submit it to the RSI site.
Robert Gamble
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