What could cause a dynamic_cast to crash?

Question

I have a piece of code looking like this :

TAxis *axis = 0;
if (dynamic_cast(obj))
   axis = (dynamic_cast         


        

Answer 1

Some possible reasons for the crash:

• obj points to an object with a non-polymorphic type (a class or struct with no virtual methods, or a fundamental type).
• obj points to an object that has been freed.
• obj points to unmapped memory, or memory that has been mapped in such a way as to generate an exception when accessed (such as a guard page or inaccessible page).
• obj points to an object with a polymorphic type, but that type was defined in an external library that was compiled with RTTI disabled.

Not all of these problems necessarily cause a crash in all situations.