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Asked: 2026-06-09T01:10:43+00:00

I am trying to dynamic_cast, one virtual class, to another: SomeClass::SomeFunc(_AListner& listner) _BListner* listner

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I am trying to dynamic_cast, one virtual class, to another:

SomeClass::SomeFunc(_AListner& listner)
_BListner* listner = dynamic_cast<_BListner*>(&listner)

Please note that class _BListner is derived from class _AListner.

But I get this error on debugging:

SIGSEGV, Segmentaion fault.

<some address> in  __dynamic_cast () from /usr/lib/libstdc++
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1 Answer

  1. Editorial Team

    SIGSEGV can be triggered by dynamic_cast when:

    • the object has a wild address
    • the object’s metadata (typically vtable pointer) has been corrupted
    • the object doesn’t match the static type of the expression

    or

    • the expression doesn’t have polymorphic type (that means the static type of the expression passed to dynamic_cast, not merely the dynamic type of the object it points into).

    The last case should be caught by the compiler though.

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