Creates a new instance ofstd::experimental::shared_ptr whose stored pointer is obtained fromr's stored pointer using a cast expression. Ifr is empty, so is the newshared_ptr (but its stored pointer is not necessarily null).

Otherwise, the newshared_ptr will share ownership withr, except that it is empty if thedynamic_cast performed bydynamic_pointer_cast returns a null pointer.

LetY betypenamestd::experimental::shared_ptr<T>::element_type, then the resultingstd::experimental::shared_ptr's stored pointer will be obtained by calling (in respective order):

The behavior of these functions is undefined unless the corresponding cast fromU* toT* is well formed:

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[edit]Example

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