std::bad_typeid
From Cppreference
| Defined in header <typeinfo>
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| class bad_typeid : public std::exception;
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An exception of this type is thrown when a typeid operator is applied to a dereferenced null pointer value or a polymorphic type.
Contents |
[edit] Member functions
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constructs a new bad_typeid object (public member function) |
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copies a bad_typeid object (public member function) |
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returns explanatory string (virtual public member function) |
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Inherited from std::exception
Member functions
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destructs the exception object (virtual public member function) |
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returns explanatory string (virtual public member function) |
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[edit] Example
#include <iostream> #include <typeinfo> struct S { // The type has to be polymorphic virtual void f(); }; int main() { S* p = nullptr; try { std::cout << typeid(*p).name() << '\n'; } catch(const std::bad_typeid& e) { std::cout << e.what() << '\n'; } }
Output:
Attempted a typeid of NULL pointer!