Error code:
Deride * q= std::dynamic_cast<Deride*>(p);Dynamic_cast is not part of STD library, but C++ keyword, so it should be removed.
Deride * q= dynamic_cast<Deride*>(p);A word of caution:
STD :: Dynamic_pointer_cast for dynamic conversion shared_PTR is the part in STD. This is also obvious because shared_PTR is a part in STD
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