Bug#811682: FTBFS with GCC 6: could not convert a from x to y

[Gert Wollny]

Are you sure?
> It fails to build from source in unstable.
> 
> View.cc: In member function 'SmartPtr<Element> View::getCharAt(const
> scaled&, const scaled&, CharIndex&, Point*, BoundingBox*) const':
> View.cc:294:10: error: 'nullptr' was not declared in this scope
>    return nullptr;

Arrg, "nullptr" is a c++11 construct, and since g++-5  defaults to
c++03, it doesn't compile like this.

Instead 

   return SmartPtr<Element>(); 

should work in both cases (if this SmartPtr template defines a sensible
default constructor). Otherwise "return NULL" should be the (ugly)
solution.

Best, 
Gert