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

From cppreference.com
< cpp‎ | memory‎ | shared ptr
Revision as of 16:40, 1 July 2013 by P12bot (Talk | contribs)

 
 
 
 
 
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)

Will return a new instance of std::shared_ptr with a casted managed object type from the r's managed object type. 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.

Parameters

r - The pointer to convert

Exceptions

noexcept specification:  
noexcept