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std::bad_typeid

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< cpp‎ | types

 
 
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Escriba apoyo (basic types, RTTI, type traits)
Gestión de memoria dinámica
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Fecha y hora
Objetos Function
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Operadores relacionales
Original:
Relational operators
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Pares y tuplas
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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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Escriba apoyo
Tipos básicos
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Basic types
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Tipos fundamentales
Tipos fijos ancho enteros (C++11)
Límites numéricos
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Numeric limits
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C numérico limita interfaz
Información de tipo en tiempo de ejecución
Original:
Runtime type information
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bad_typeid
Caracteres de tipo
Original:
Type traits
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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
Original:
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_typeid
Las funciones miembro
Original:
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_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 .
Original:
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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(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 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';
    }
}

Salida:

Attempted a typeid of NULL pointer!