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    std::is_standard_layout

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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
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    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)
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    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)
    is_trivial(C++11)
    is_trivially_copyable(C++11)
    is_standard_layout(C++11)
    is_literal_type(C++11)
    is_signed(C++11)
    is_unsigned(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)
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    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 <type_traits>
    template<class T >
    struct is_standard_layout;
    		(seit C++11)
    Wenn T ein Standard-Tastaturbelegung (das heißt, eine skalare Typ, ein Standard-Layout-Klasse, oder ein Array solcher Art / Klasse, möglicherweise cv-qualifiziert) ist, stellt das Mitglied konstanten value gleich true. Für jede andere Art, value ist false .
    Original:
    If T is a standard layout type (that is, a scalar type, a standard-layout class, or an array of such type/class, possibly cv-qualified), provides the member constant value equal true. For any other type, value is false.
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    Ein Standard-Layout-Klasse ist eine Klasse,
    Original:
    A standard-layout class is a class that
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    Ein. hat keine nicht-statische Datenelemente, die nicht Standard-Layout
    Original:
    1. has no non-static data members that aren't standard-layout
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    2. hat keine virtuellen Funktionen und keine virtuellen Basisklassen
    Original:
    2. has no virtual functions and no virtual base classes
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    3. hat den gleichen Zugang zur Steuerung aller nicht-statische Datenelemente
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    3. has the same access control for all non-static data members
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    4. hat keine Basisklassen, die nicht Standard-Layout
    Original:
    4. has no base classes that aren't standard-layout
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    5. hat entweder keine Basisklasse mit nicht-statische Datenelemente oder hat keine nicht-statische Datenelemente in den meisten abgeleiteten Klasse und nur eine Basis mit ihnen
    Original:
    5. either has no base class with non-static data members or has no non-static data members in the most derived class and only one base with them
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    6. hat keine Basisklassen des gleichen Typs wie das erste nicht-statisches Datenelement
    Original:
    6. has no base classes of the same type as the first non-static data member
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    Inhaltsverzeichnis

    Inherited from std::integral_constant

    Member constants

    value
    [statisch]
    true wenn T is a standard-layout type , false anders
    Original:
    true if T is a standard-layout type , false otherwise
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    (public static Mitglied konstanten)

    Member functions

    operator bool
    wandelt das Objekt bool, gibt value
    Original:
    converts the object to bool, returns value
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    (öffentliche Elementfunktion)

    Member types

    Type
    Original:
    Type
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    		 Definition
    value_typebool
    typestd::integral_constant<bool, value>

    [Bearbeiten]Notes

    Ein Zeiger auf eine Standard-Layout-Klasse kann umgewandelt (mit reinterpret_cast) auf einen Zeiger auf sein erstes nicht-statische Daten Mitglied werden und umgekehrt .
    Original:
    A pointer to a standard-layout class may be converted (with reinterpret_cast) to a pointer to its first non-static data member and vice versa.
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    Wenn ein Standard-Layout union hält zwei oder mehr Standard-Layout-Strukturen, ist es erlaubt, den gemeinsamen ersten Teil von ihnen untersuchen .
    Original:
    If a standard-layout union holds two or more standard-layout structs, it is permitted to inspect the common initial part of them.
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    Das Makro offsetof kann nur mit Standard-Layout-Klassen verwendet werden .
    Original:
    The macro offsetof can only be used with standard-layout classes.
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    [Bearbeiten]Beispiel

    #include <iostream>#include <type_traits>   struct A {int m;};   struct B {int m1;private:int m2;};   struct C {virtualvoid foo();};   int main(){std::cout<<std::boolalpha;std::cout<< std::is_standard_layout<A>::value<<'\n';std::cout<< std::is_standard_layout<B>::value<<'\n';std::cout<< std::is_standard_layout<C>::value<<'\n';}

    Output: 

    true false false

    [Bearbeiten]Siehe auch

    (C++11)
    		 checks if a type is trivially copyable
    (Klassen-Template)[edit]
    (C++11)
    prüft, ob ein Typ ist plain-old-Daten (POD)-Typ
    Original:
    checks if a type is plain-old data (POD) type
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    (Klassen-Template)[edit]
    Abstand zwischen dem Beginn eines Standard-Layout-Typs und der benannten Member-Variable in Byte
    Original:
    byte offset from the beginning of a standard-layout type to specified member
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    (funktionieren Makro)[edit]
    Von „https://de.cppreference.com/mwiki/index.php?title=cpp/types/is_standard_layout&oldid=30246“
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