[Dune] [#674] strict-aliasing warnings with gcc-4.4

[Dune]

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The following task has a new comment added:

FS#674 - strict-aliasing warnings with gcc-4.4
User who did this - Martin Nolte (nolte)

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As I wrote in yesterday's eMail, I think the placement-new is not an option because it calls some constructor. We cannot safely assume that a default constructor does nothing. The copy constructor is not an option either, because the entity pointer could be implemented as a shared_ptr. Copying would lead to a wrong increase in the reference count and thus a memory leak.
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