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nullptr pointer literal

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Inhaltsverzeichnis

[Bearbeiten] Syntax

nullptr (seit C++11)

[Bearbeiten] Erklärung

Das Schlüsselwort nullptr bezeichnet die Null-Zeiger-Literal. Es ist ein nicht näher spezifizierter prvalue vom Typ std::nullptr_t. Es gibt <div class="t-tr-text">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 .
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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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</div> 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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[Bearbeiten] 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

[Bearbeiten] Keywords

nullptr

[Bearbeiten] 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]
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/language/nullptr&oldid=27095“