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# std::static_pointer_cast, std::dynamic_pointer_cast, std::const_pointer_cast

From cppreference.com
< cpp‎ | memory‎ | shared ptr

template< class T, class U > shared_ptr<T> static_pointer_cast( const shared_ptr<U>& r ); | (1) | (since C++11)
template< class T, class U > shared_ptr<T> dynamic_pointer_cast( const shared_ptr<U>& r ); | (2) | (since C++11)
template< class T, class U > shared_ptr<T> const_pointer_cast( const shared_ptr<U>& r ); | (3) | (since C++11)

Creates a new instance of std::shared_ptr whose managed object type is obtained from the `r`'s managed object type using a cast expression. Both smart pointers will share the ownership of the managed object.

The resulting std::shared_ptr's managed object will be obtained by calling (in respective order):

1) `static_cast<T*>(r.get())`.
2) `dynamic_cast<T*>(r.get())` (If the result of the `dynamic_cast` is 0, the returned shared_ptr will be empty).
3) `const_cast<T*>(r.get())`.

In any case, if the parameter `r` is an empty std::shared_ptr the result will be a new empty std::shared_ptr.

### [edit] Parameters

r | - | The pointer to convert

### [edit] Exceptions

`noexcept` specification:
noexcept
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Category:

- unconditionally noexcept