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std::has_virtual_destructor

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Basic types
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has_virtual_destructor
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Definido en la cabecera <type_traits>
template< class T >
struct has_virtual_destructor;
(desde C++11)
Si T es un tipo con un destructor virtual, proporciona el miembro constante value true igual. Para cualquier otro tipo, es value false .
Original:
If T is a type with a virtual destructor, 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 has a virtual destructor , false lo contrario
Original:
true if T has a virtual destructor , 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

Si una clase tiene un destructor virtual público, que se puede derivar de, y el objeto derivado puede ser eliminado con seguridad a través de un puntero al objeto base (C++FAQ Lite 20.7)
Original:
If a class has a public virtual destructor, it can be derived from, and the derived object can be safely deleted through a pointer to the base object (C++FAQ Lite 20.7)
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[editar] Ejemplo

#include <iostream>
#include <type_traits>
#include <string>
#include <stdexcept>
 
int main()
{
    std::cout << std::boolalpha
              << "std::string has a virtual destructor? "
              << std::has_virtual_destructor<std::string>::value << '\n'
              << "std::runtime_error has a virtual destructor? "
              << std::has_virtual_destructor<std::runtime_error>::value << '\n';
}

Salida:

std::string has a virtual destructor? false
std::runtime_error has a virtual destructor? true

[editar] Ver también

Comprueba si un tipo tiene un destructor no eliminado
Original:
checks if a type has a non-deleted destructor
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(plantilla de clase) [editar]