[Dune] [#766] Separate GenericGeometries and the SmallObjectPool

[Dune]

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The following task has a new comment added:

FS#766 - Separate GenericGeometries and the SmallObjectPool
User who did this - Martin Nolte (nolte)

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I have a question: How do STL allocators work with dynamic polymorphism?

Especially the following two points are unclear to me:
* The container has an allocator for the abstract base type. May I simply copy it into an allocator for the derived type and call allocate there?
* When destroying the object, may I use the allocator for the abstract base class?

Maybe, you could provide some very simple demo code? Just an abstract base class, two derived classes and a container storing pointers to the base type would be great.
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