[Dune] [#672] GridFactory: "BoundarySegments" for Elements

[Dune]

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The following task has a new comment added:

FS#672 - GridFactory: "BoundarySegments" for Elements
User who did this - Oliver Sander (sander)

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This is a classic problem in dynamic polymorphism, and there is a classic solution.  You need a virtual method create() and/or a virtual method clone() in your hierarchy. The former replaces the default constructor, while the latter replaces the copy constructor.  In fact, this is what the stuff in dune/common/interfaces.hh is good for.

cf. also, e.g.,
 http://en.wikibooks.org/wiki/C%2B%2B_Programming/Classes/Polymorphism
the section on virtual constructors.

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