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    nullptr pointer literal

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    Syntax

    nullptr (seit C++11)

    Erklärung

    Das Schlüsselwort nullptr bezeichnet die Null-Zeiger-Literal. Es ist ein nicht näher spezifizierter prvalue vom Typ std::nullptr_t. Es gibt
    impliziten Konvertierungen
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    implicit conversions
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     von nullptr zum Null-Zeiger Wert eines Zeigers Art und jeder Zeiger auf Elementtyp. Ähnliche Umsetzungen gibt es für jeden Wert des Typs std::nullptr_t sowie für den Makro NULL, der Null-Zeiger konstanten .
    Original:
    The keyword nullptr denotes the null pointer literal. It is an unspecified prvalue of type std::nullptr_t. There exist
    impliziten Konvertierungen
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    implicit conversions
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     from nullptr to null pointer value of any pointer type and any pointer to member type. Similar conversions exist for any value of type std::nullptr_t as well as for the macro NULL, the null pointer constant.
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    Beispiel

    Veranschaulicht, wie nullptr Weiterleitung über eine Template-Funktion ermöglicht .
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    Demonstrates how nullptr allows forwarding via a template function.
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    #include <cstddef>
#include <iostream>

template<class F, class A>
void Fwd(F f, A a)
{
    f(a);
}

void g(int* i)
{
    std::cout << "Function g called\n";
}

int main()
{
    g(NULL);           // Fine
    g(0);              // Fine

    Fwd(g, nullptr);   // Fine
//  Fwd(g, NULL);  // ERROR: No function g(int)
}

    Output: 

    Function g called
Function g called
Function g called

    Keywords

    nullptr

    Siehe auch
    Implementierung definiert Null-Zeiger konstant
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    implementation-defined null pointer constant
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    (Makro konstant) [edit]
    (C++11)
    die Art der Null-Zeiger wörtliche nullptr
    Original:
    the type of the null pointer literal nullptr
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    (typedef) [edit]