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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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      Definido no cabeçalho <typeinfo>
      class bad_cast :publicstd::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)

      Herdado de 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 {virtualvoid f(){}};struct Bar {virtualvoid f(){}};   int main(){ Bar b;try{ Foo& f =dynamic_cast<Foo&>(b);}catch(const std::bad_cast& e){std::cout<< e.what()<<'\n';}}

      Saída: 

      Bad dynamic_cast!
      Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/types/bad_cast&oldid=24530"
      close