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RogueWave's RWCollectable

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Hi Experts,

I am migrating from RogueWave to STL. I am facing some
problem over RWCollectable class.

Some Background:

Since RWCollectable is a base class implementing polymorpic
persistency, any class derived from RWCollectable will also have this
feature.RWOrdered is also derived from RWCollectable.
Now I have following code snippest:

RWOrdered collection;

RWCollectableString* george;
george = new RWCollectableString("George");

collection.insert(george); // Add the string once
collection.insert(george); // Add the string twice
collection.insert(new RWCollectableInt(100));
collection.insert(new RWCollectableDate(3, "May", 1959));

// "Store" to cout using portable stream:
RWpostream ostr(cout);
ostr << collection;


return 0;

Above code maintains polymorphic persistency (i.e. string george will
be inserted only once to the stream and while we resore, we will have
same object morph.).

My Questions are:

1 Persistency should be the functionality of RWOrdered and not
RWCollectableString. Why we use RWCollectableString ?. If I dont use
RWCollectableSting and simply use RWCSting what would have happened
fundamentaly ?

2What will be the design of RWCollectableString to maintain
polymorphic persistency ?
3 I found lots of code as follow:

RWOrdered od;
od.insert(new RWCollectableInt(0)); // 0
od.insert(new RWCollectableInt(1)); // 0 1
od.insert(new RWCollectableInt(2)); // 0 1 2

delete od(1); // Use variant available for RWOrdered = new RWCollectableInt(3); // 0 3 2

Is there any used of RWCollectableInt there ?
I dont have any RogueWave library with me, So I am not able to conclude
over above questions by some trial and run bases.


Oct 4 '06 #1
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