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std::bad_cast

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< cpp‎ | types
 
 
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Operadores relacionales
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Pairs and tuples
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Cambiar, hacia adelante y mover
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Swap, forward and move
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Tipos básicos
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Basic types
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Información de tipo en tiempo de ejecución
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Runtime type information
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bad_cast
Caracteres de tipo
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Categorías primarias de tipo
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Primary type categories
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Propiedades de tipo
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Type properties
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Operaciones compatibles
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Supported operations
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Relaciones y consultas de propiedad
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Relationships and property queries
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Modificaciones de tipo
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Type modifications
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Transformaciones de tipo
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Type transformations
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Escriba constantes rasgos
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Type trait constants
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std::bad_cast
Las funciones miembro
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Member functions
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Se hereda de std::exception
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Inherited from std::exception
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Definido en la cabecera <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) .
Original:
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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(función miembro público)

Inherited from std::exception

Member functions

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

[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';
    }
}

Salida:

Bad dynamic_cast!