Difference between revisions of "cpp/memory/shared ptr/pointer cast"
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Revision as of 13:35, 15 June 2012
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<td >shared_ptr<T> static_pointer_cast( const shared_ptr<U>& r );
<td > (1) </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">
<td >shared_ptr<T> dynamic_pointer_cast( const shared_ptr<U>& r );
<td > (2) </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">
<td >shared_ptr<T> const_pointer_cast( const shared_ptr<U>& r );
<td > (3) </td> <td > (since C++11) </td> </tr>
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Will return a new instance of std::shared_ptr with a casted managed object type from the r's managed objet 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 all 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 |
