W3cubDocs
/C++std::bad_typeid
Defined in header <typeinfo> | ||
|---|---|---|
class bad_typeid : public std::exception; |
An exception of this type is thrown when a typeid operator is applied to a dereferenced null pointer value of a polymorphic type.
Inheritance diagram.
Member functions
constructs a new bad_typeid object (public member function) |
Inherited from std::exception
Member functions
|
[virtual] | destroys the exception object (virtual public member function of std::exception) |
|
[virtual] | returns an explanatory string (virtual public member function of std::exception) |
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!
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
http://en.cppreference.com/w/cpp/types/bad_typeid