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    std::nullptr_t

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    <tbody> </tbody>
    Déclaré dans l'en-tête <cstddef>
    typedef decltype(nullptr) nullptr_t;
    		 (depuis C++11)
    std::nullptr_t est le type de pointeur NULL littérale, nullptr .
    Original:
    std::nullptr_t is the type of the null pointer literal, nullptr.
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    Exemple

    Si deux ou plusieurs surcharges accepter types de pointeurs différents, une surcharge pour std::nullptr_t est nécessaire d'accepter un argument pointeur nul .
    Original:
    If two or more overloads accept different pointer types, an overload for std::nullptr_t is necessary to accept a null pointer argument.
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    #include <cstddef>
#include <iostream>

void f(int* pi)
{
   std::cout << "Pointer to integer overload\n";
}

void f(double* pd)
{
   std::cout << "Pointer to double overload\n";
}

void f(std::nullptr_t nullp)
{
   std::cout << "null pointer overload\n";
}

int main()
{
    int* pi; double* pd;

    f(pi);
    f(pd);
    f(nullptr);  // would be ambiguous without void f(nullptr_t)
    // f(NULL);  // ambiguous overload: all three functions are candidates
}

    Résultat : 

    Pointer to integer overload
Pointer to double overload
null pointer overload

    Voir aussi

    nullptr
    le pointeur littéral qui spécifie un pointeur NULL (C++11) valeur
    Original:
    the pointer literal which specifies a null pointer value (C++11)
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    [edit]
    définie par l'implémentation pointeur NULL constante
    Original:
    implementation-defined null pointer constant
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    (constante macro) [edit]