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    std::nullptr_t

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    Grundtypen
    Feste Breite Integer-Typen(C++11)
    nullptr_t(C++11)
    offsetof
    NULL
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    definiert in Header <cstddef>
    typedef decltype(nullptr) nullptr_t;
    		(seit C++11)
    std::nullptr_t ist die Art der Null-Zeiger Literal nullptr .
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    std::nullptr_t is the type of the null pointer literal, nullptr.
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    [Bearbeiten]Beispiel

    Wenn zwei oder mehr Überlastungen verschiedenen Zeigertypen zu akzeptieren, ist eine Überlast für std::nullptr_t notwendig, um eine Null-Zeiger-Argument akzeptieren .
    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}

    Output: 

    Pointer to integer overload Pointer to double overload null pointer overload

    [Bearbeiten]Siehe auch

    nullptr
    der Zeiger wörtliche, die eine Null-Zeiger-Wert (C++11) angibt
    Original:
    the pointer literal which specifies a null pointer value (C++11)
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    [edit]
    Implementierung definiert Null-Zeiger konstant
    Original:
    implementation-defined null pointer constant
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    (Makro konstant)[edit]
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/types/nullptr_t&oldid=30268“
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