Espaços nominais
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NULL

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Definido no cabeçalho <cstddef>
Definido no cabeçalho <cstring>
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Definido no cabeçalho <ctime>
Definido no cabeçalho <clocale>
Definido no cabeçalho <cstdio>
#define NULL /*implementation-defined*/
Define a constante ponteiro nulo, que é uma expressão integral prvalue constante do tipo inteiro que avalia a zero ou um prvalue de std::nullptr_t tipo. O ponteiro nulo constante pode ser convertidos implicitamente a qualquer tipo de ponteiro; resultados de conversão desse tipo no valor de ponteiro nulo do tipo. Se a constante de ponteiro nulo tem tipo inteiro, ele pode ser convertido para um tipo de prvalue std::nullptr_t.
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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 convertidos implicitamente 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] Possível implementação

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

[editar] Exemplo

#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] Veja também

nullptr
o ponteiro literal que especifica um valor nulo (C++11) ponteiro
Original:
the pointer literal which specifies a null pointer value (C++11)
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[edit]
(C++11)
o tipo de nullptr ponteiro nulo literal
Original:
the type of the null pointer literal nullptr
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(typedef) [edit]
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