[Dune] [#682] Minor bug in use of shared_ptr<> in mpicollectivecommunicationhh

[Dune]

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FS#682 - Minor bug in use of shared_ptr<> in mpicollectivecommunicationhh
User who did this - Atgeirr Flø Rasmussen (atgeirr)

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First, I must apologize for not realizing that the Dune-supplied shared_ptr<> replacement does not supply get() or the conversion-to-bool-equivalent (which as far as I have understood usually is done as a pointer-to-member-function to avoid unwanted conversions succeeding).

In any case, the use of operator->() for obtaining the pointer is not usable with the non-Dune variants, so something must be added. I suggest adding get() and reset(T*) to the Dune-supplied shared_ptr<> so that they can be used in Dune code without portability issues. Then using if (ptr.get()) should be a portable way to check for a non-null pointer.
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