std::dynamic_pointer_cast on a shared_ptr

Returns a copy (of the given shared_ptr) instantiated in the same “club”.

The returned type must be a derived type of the original… equivalent to a dynamic_cast() on a raw ptr.

http://www.cplusplus.com/reference/memory/dynamic_pointer_cast/ example looks lame as it doesn’t have virtual function, so dynamic_cast() isn’t applicable !

https://github.com/tiger40490/repo1/blob/cpp1/cpp/template/shPtrDownCast.cpp is my own experiment.

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