[Development] std::allocate_shared for QSharedPointer

[Sean Harmer]

Hi,

I have a use case where we need to create, use and destroy a relatively 
large number of QSharedPointers rapidly. To avoid the malloc overhead it 
would be nice to be able to use a pool of QSharedPointers.

We have QSharedPointer::create() which is analogous to 
std::make_shared() that allows to reduce creating a QSharedPointer and 
the object it points at to a single memory allocation.

However, this uses operator new internally. I can't see any equivalent 
of std::allocate_shared() which would allow the use of a custom 
allocator for the QSP and object memory allocation.

Does anybody have any plans to add such a facility? Or is there some 
other facility to avoid operator new here for both the QSP and the 
object itself?

Thanks,

Sean
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