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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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Defined in header <typeinfo>
class bad_cast : public std::exception;
Uma exceção deste tipo é acionada quando um dynamic_cast a um tipo de referência falhar a verificação em tempo de execução (por exemplo, porque os tipos não estão relacionadas por herança).
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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
Sobre esta imagem

Inheritance diagram

Índice

[editar] Funções de membro
constrói um objeto bad_cast novo
Original:
constructs a new bad_cast object
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(função pública membro)

Inherited from std::exception

Member functions

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

[editar] Exemplo

#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!
Obtida de "http://pt.cppreference.com/mwiki/index.php?title=cpp/types/bad_cast&oldid=17447"