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std::is_polymorphic

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< cpp‎ | types

 
 
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Original:
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Basic types
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is_polymorphic
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Operaciones compatibles
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Supported operations
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Definido en la cabecera <type_traits>
template< class T >
struct is_polymorphic;
(desde C++11)
Si T es una clase polimórfica (es decir, una clase que declara o hereda al menos una función virtual), proporciona el miembro constante value true igual. Para cualquier otro tipo, es value false .
Original:
If T is a polymorphic class (that is, a class that declares or inherits at least one virtual function), provides the member constant value equal true. For any other type, value is false.
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Contenido

Inherited from std::integral_constant

Member constants

value
[estático]
true si T is a polymorphic class type , false lo contrario
Original:
true if T is a polymorphic class type , false otherwise
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(miembro público estático constante)

Member functions

operator bool
convierte el objeto a bool, devuelve value
Original:
converts the object to bool, returns value
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(función miembro público)

Member types

Tipo
Original:
Type
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Definition
value_type bool
type std::integral_constant<bool, value>

[editar] Notas

Sólo las clases polimórficas contienen información oculta RTTI que hace posible examinar y convertirlos con dynamic_cast .
Original:
Only polymorphic classes contain hidden RTTI information which makes it possible to examine and convert them with dynamic_cast.
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[editar] Ejemplo

#include <iostream>
#include <type_traits>
 
struct A {
    int m;
};
 
struct B {
    virtual void foo();
};
 
struct C : B {};
 
int main()
{
    std::cout << std::boolalpha;
    std::cout << std::is_polymorphic<A>::value << '\n';
    std::cout << std::is_polymorphic<B>::value << '\n';
    std::cout << std::is_polymorphic<C>::value << '\n';
}

Salida:

false
true
true

[editar] Ver también

(C++11)
checks if a type is a class type (but not union type)
(plantilla de clase) [editar]
Comprueba si un tipo es el tipo de clase abstracta
Original:
checks if a type is abstract class type
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(plantilla de clase) [editar]