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    NULL

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    C++
     
    Utilities-Bibliothek
     
    Geben Sie Unterstützung
    Grundtypen
    Original:
    Basic types
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    Grundtypen
    Feste Breite Integer-Typen(C++11)
    Numerische Grenzen
    Original:
    Numeric limits
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    numeric_limits
    C numerische begrenzt Schnittstelle
    Laufzeit-Typinformationen
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    Runtime type information
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    Exterieur
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    Type traits
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    Primären Typ Kategorien
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    Primary type categories
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    is_void(C++11)
    is_array(C++11)
    is_pointer(C++11)
    is_enum(C++11)
    is_union(C++11)
    is_class(C++11)
    is_function(C++11)
    is_reference(C++11)
    is_lvalue_reference(C++11)
    is_rvalue_reference(C++11)
    is_member_pointer(C++11)
    is_member_object_pointer(C++11)
    is_member_function_pointer(C++11)
    Typ Eigenschaften
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    Type properties
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    is_const(C++11)
    is_volatile(C++11)
    is_pod(C++11)
    is_empty(C++11)
    is_polymorphic(C++11)
    is_abstract(C++11)
    Unterstützte Operationen
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    Supported operations
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    is_constructible
    is_trivially_constructible
    is_nothrow_constructible    		(C++11)
    (C++11)
    (C++11)
    is_default_constructible
    is_trivially_default_constructible
    is_nothrow_default_constructible    		(C++11)
    (C++11)
    (C++11)
    is_copy_constructible
    is_trivially_copy_constructible
    is_nothrow_copy_constructible    		(C++11)
    (C++11)
    (C++11)
    is_move_constructible
    is_trivially_move_constructible
    is_nothrow_move_constructible    		(C++11)
    (C++11)
    (C++11)
    is_assignable
    is_trivially_assignable
    is_nothrow_assignable    		(C++11)
    (C++11)
    (C++11)
    is_copy_assignable
    is_trivially_copy_assignable
    is_nothrow_copy_assignable    		(C++11)
    (C++11)
    (C++11)
    is_move_assignable
    is_trivially_move_assignable
    is_nothrow_move_assignable    		(C++11)
    (C++11)
    (C++11)
    is_destructible
    is_trivially_destructible
    is_nothrow_destructible    		(C++11)
    (C++11)
    (C++11)
    has_virtual_destructor(C++11)
    Beziehungen und Eigentum Abfragen
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    Relationships and property queries
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    is_same(C++11)
    is_base_of(C++11)
    is_convertible(C++11)
    alignment_of(C++11)
    rank(C++11)
    extent(C++11)
    Typ Modifikationen
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    Type modifications
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    Typ Transformationen
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    Type transformations
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    aligned_storage(C++11)
    aligned_union(C++11)
    decay(C++11)
    enable_if(C++11)
    Typ-Trait-Konstanten
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    Type trait constants
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    integral_constant(C++11)
     
    definiert in Header <cstddef>
    definiert in Header <cstring>
    definiert in Header <cwchar>
    definiert in Header <ctime>
    definiert in Header <clocale>
    definiert in Header <cstdio>
    #define NULL /*implementation-defined*/
    Definiert den Null-Zeiger-Konstante, die ein integraler konstanter Ausdruck prvalue von Integer-Typ, der auf Null wertet oder prvalue vom Typ std::nullptr_t ist. Die Null-Pointer-Konstante kann implizit konvertiert jedem Zeigertyp sein; eine solche Umwandlung Ergebnisse in den Null-Zeiger-Wert dieses Typs. Wenn die Null-Zeiger Konstante Integer-Typ, kann es zu einer prvalue vom Typ std::nullptr_t umgewandelt werden .
    Original:
    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 implizit konvertiert 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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    [Bearbeiten]Mögliche Implementierung

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

    [Bearbeiten]Beispiel

    #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;}


    [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]
    (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/types/NULL&oldid=28120“
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