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std::bad_cast

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std::bad_cast
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bad_cast::bad_cast
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Inherited from std::exception
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exception::~exception
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Defined in header <typeinfo>
class bad_cast : public std::exception;
Una excepción de este tipo se produce cuando un dynamic_cast a un tipo de referencia no pasa la comprobación en tiempo de ejecución (por ejemplo, porque los tipos no están relacionados por herencia) .
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An exception of this type is thrown when a dynamic_cast to a reference type fails the run-time check (e.g. because the types are not related by inheritance).
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cpp/error/exceptionstd-bad cast-inheritance.svg
Acerca de esta imagen

Inheritance diagram

Contenido

[editar] Las funciones miembro
construye un objeto bad_cast nuevo
Original:
constructs a new bad_cast 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 Foo { virtual void f() {} };
struct Bar { virtual void f() {} };
 
int main()
{
    Bar b;
    try {
        Foo& f = dynamic_cast<Foo&>(b);
    } catch(const std::bad_cast& e)
    {
        std::cout << e.what() << '\n';
    }
}

Output: 

Bad dynamic_cast!
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/types/bad_cast&oldid=22149»