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NULL

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C++
 
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rel_ops::operator!=
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NULL
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(C++11)
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is_move_assignable
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(C++11)
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Escriba constantes rasgos
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integral_constant(C++11)
 
Defined in header <cstddef>
Defined in header <cstring>
Defined in header <cwchar>
Defined in header <ctime>
Defined in header <clocale>
Defined in header <cstdio>
#define NULL /*implementation-defined*/
Define la constante de puntero nulo, que es un prvalue integral expresión constante de tipo entero que se evalúa como cero o un prvalue de std::nullptr_t tipo. La constante de puntero nulo puede ser convertir implícitamente a cualquier tipo de puntero; tales resultados de conversión en el valor de puntero nulo de ese tipo. Si la constante de puntero nulo tiene tipo entero, puede ser convertido a un prvalue de tipo std::nullptr_t .
Original:
Defines the null pointer constant, which is an integral constant expression prvalue of integer type that evaluates to zero or a prvalue of type std::nullptr_t. The null pointer constant may be convertir implícitamente to any pointer type; such conversion results in the null pointer value of that type. If the null pointer constant has integer type, it may be converted to a prvalue of type std::nullptr_t.
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[editar] Posible implementación

#define NULL 0
//since C++11
#define NULL nullptr

[editar] Ejemplo

#include <cstddef>
class S;
int main()
{
    int* p = NULL;
    int* p2 = static_cast<std::nullptr_t>(NULL);
    void(*f)(int) = NULL;
    int S::*mp = NULL;
    void(S::*mfp)(int) = NULL;
}


[editar] Ver también

nullptr
el puntero literal que especifica un puntero (C++11) valor nulo
Original:
the pointer literal which specifies a null pointer value (C++11)
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[edit]
(C++11)
el tipo de la nullptr literal puntero nulo
Original:
the type of the null pointer literal nullptr
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(typedef) [edit]
Obtenido de «http://es.cppreference.com/mwiki/index.php?title=cpp/types/NULL&oldid=22201»