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std::bad_typeid

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C++
 
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Swap, forward and move
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Información de tipo en tiempo de ejecución
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Runtime type information
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bad_typeid
bad_cast
Caracteres de tipo
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integral_constant(C++11)
 
std::bad_typeid
Las funciones miembro
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Member functions
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bad_typeid::bad_typeid
Se hereda de std::exception
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Inherited from std::exception
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exception::~exception
exception::what
 
Defined in header <typeinfo>
class bad_typeid : public std::exception;
Una excepción de este tipo se produce cuando un operador typeid se aplica a un valor nulo puntero sin referencia o un tipo polimórfico .
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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.
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cpp/error/exceptionstd-bad typeid-inheritance.svg
Acerca de esta imagen

Inheritance diagram

Contenido

[editar] Las funciones miembro
construye un objeto bad_typeid nuevo
Original:
constructs a new bad_typeid object
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(miembro público función)

Inherited from std::exception

Member functions

[virtual]
destructs el objeto de excepción
Original:
destructs the exception object
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(Virtual Member público of std::exception función) [edit]
[virtual]
devuelve una cadena explicativa
Original:
returns an explanatory string
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(Virtual Member público of std::exception función) [edit]

[editar] Ejemplo

#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!
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/types/bad_typeid&oldid=22135»