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std::experimental::static_pointer_cast, std::experimental::dynamic_pointer_cast, std::experimental::const_pointer_cast, std::experimental::reinterpret_pointer_cast

From cppreference.com
 
 
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std::experimental::shared_ptr
Member functions
Non-member functions
experimental::static_pointer_castexperimental::dynamic_pointer_castexperimental::const_pointer_castexperimental::reinterpret_pointer_cast
Members and non-members identical to those of std::shared_ptr
 
template< class T, class U >
std::experimental::shared_ptr<T> static_pointer_cast( const std::experimental::shared_ptr<U>& r ) noexcept;
(1) (library fundamentals TS)
template< class T, class U >
std::experimental::shared_ptr<T> dynamic_pointer_cast( const std::experimental::shared_ptr<U>& r ) noexcept;
(2) (library fundamentals TS)
template< class T, class U >
std::experimental::shared_ptr<T> const_pointer_cast( const std::experimental::shared_ptr<U>& r ) noexcept;
(3) (library fundamentals TS)
template< class T, class U >
std::experimental::shared_ptr<T> reinterpret_pointer_cast( const std::experimental::shared_ptr<U>& r ) noexcept;
(4) (library fundamentals TS)

Creates a new instance of std::experimental::shared_ptr whose stored pointer is obtained from r's stored pointer using a cast expression. If r is empty, so is the new shared_ptr (but its stored pointer is not necessarily null).

Otherwise, the new shared_ptr will share ownership with r, except that it is empty if the dynamic_cast performed by dynamic_pointer_cast returns a null pointer.

Let Y be typename std::experimental::shared_ptr<T>::element_type, then the resulting std::experimental::shared_ptr's stored pointer will be obtained by calling (in respective order):

1) static_cast<Y*>(r.get()).
2) dynamic_cast<Y*>(r.get()) (If the result of the dynamic_cast is a null pointer value, the returned shared_ptr will be empty).
3) const_cast<Y*>(r.get()).
4) reinterpret_cast<Y*>(r.get()).

The behavior of these functions is undefined unless the corresponding cast from U* to T* is well formed:

1) The behavior is undefined unless static_cast<T*>((U*)nullptr) is well formed.
2) The behavior is undefined unless dynamic_cast<T*>((U*)nullptr) is well formed.
3) The behavior is undefined unless const_cast<T*>((U*)nullptr) is well formed.
4) The behavior is undefined unless reinterpret_cast<T*>((U*)nullptr) is well formed.

[edit] Parameters

r - The pointer to convert

[edit] Example

[edit] See also

constructs new shared_ptr
(public member function) [edit]
applies static_cast, dynamic_cast, const_cast, or reinterpret_cast to the stored pointer
(function template) [edit]