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alignof operator (seit C++11)

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Abfragen Ausrichtungsanforderungen eines Typs
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Queries alignment requirements of a type
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Inhaltsverzeichnis

[Bearbeiten] Syntax

alignof( type )
Gibt ein Objekt vom Typ std::size_t .
Original:
Returns an object of type std::size_t.
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[Bearbeiten] Erklärung

Versandkosten Ausrichtung in Bytes (eine ganzzahlige Potenz von zwei) für jede Instanz des angegebenen type, die entweder komplett Typ, ein Array-Typ oder ein Referenztyp ist erforderlich .
Original:
Returns alignment in bytes (an integer power of two) required for any instance of the given type, which is either complete type, an array type, or a reference type.
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Wenn der Typ Referenz-Typ, gibt der Operator die Ausrichtung der verwiesen Typ, wenn der Typ Array-Typ, Ausrichtung Forderung der Element-Typ zurückgegeben wird .
Original:
If the type is reference type, the operator returns the alignment of referenced type; if the type is array type, alignment requirement of the element type is returned.
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Die Typen char, signed char und unsigned char die schwächste (kleinste) Ausrichtung durch die Implementierung unterstützt .
Original:
The types char, signed char, and unsigned char have the weakest (smallest) alignment supported by the implementation.
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[Bearbeiten] Keywords

alignof

[Bearbeiten] Beispiel

#include <iostream>
 
struct Empty {};
 
struct Foo {
     int f2;
     float f1;
     char c;
};
 
int main()
{
    std::cout << "alignment of empty class: " << alignof(Empty) << '\n'
              << "alignment of pointer : "    << alignof(int*)  << '\n'
              << "alignment of char : "       << alignof(char)  << '\n'
              << "alignment of Foo : "        << alignof(Foo)   << '\n' ;
}

Output:

alignment of empty class: 1
alignment of pointer : 8
alignment of char : 1
alignment of Foo : 4

[Bearbeiten] Siehe auch

alignas Spezifizierer
gibt an, dass der Speicher für die Variable durch bestimmte Menge (C++11) ausgerichtet werden soll
Original:
specifies that the storage for the variable should be aligned by specific amount (C++11)
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[edit]
Ruft den Type der Alignment-Anforderungen
Original:
obtains the type's alignment requirements
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(Klassen-Template) [edit]