The get_deleter non-member
function allows you to access the deleter associated with a std::experimental::shared_ptr instance if you know
the type of the deleter.
template<typename T,typename Deleter> Deleter* get_deleter(shared_ptr<T> const& p) noexcept;
&d
if p owns
a deleter d of
type Deleter,
nullptr otherwise.
Nothing.