When using smart pointers it may be necessarry to use some sort of
downcasting.
It would be great if one can write

smart_ptr<A> ptrA;
smart_ptr<B> ptrB=dynamic_cast<B>(ptrA);

[instead of smart_ptr<B> ptrB=my_weird_downcast_to<B>(ptrA)]

with the function

template <class To,class From>
smart_ptr<To> dynamic_cast(smart_ptr<From> & ptr);

being invoked.

Standard dynamic_cast may not be a function template, however, and it
would not be allowed to create

To * dynamic_cast(From * ) and To & dynamic_cast(From &)

But I feel gotchas here. Am I right ?

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