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std::bad_typeid

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bad_typeid
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std::bad_typeid
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bad_typeid::bad_typeid
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Inherited from std::exception
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exception::~exception
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Defined in header <typeinfo>
class bad_typeid : public std::exception;
Uma excepção deste tipo é lançada quando um operador typeid é aplicada para um valor nulo dereferenced ponteiro ou um tipo polimórfico.
Original:
An exception of this type is thrown when a typeid operator is applied to a dereferenced null pointer value or a polymorphic type.
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cpp/error/exceptionstd-bad typeid-inheritance.svg
Sobre esta imagem

Inheritance diagram

Índice

[editar] Funções de membro

constrói um objeto bad_typeid novo
Original:
constructs a new bad_typeid object
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(função pública membro)

Inherited from std::exception

Member functions

[virtual]
destrói o objeto de exceção
Original:
destructs the exception object
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(of std::exception função pública virtual membro) [edit]
[virtual]
retorna uma cadeia explicativa
Original:
returns an explanatory string
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(of std::exception função pública virtual membro) [edit]

[editar] Exemplo

#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!