alignof operator (seit C++11)
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Abfragen Ausrichtungsanforderungen eines Typs
Original:
Queries alignment requirements of a type
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Inhaltsverzeichnis |
[Bearbeiten] Syntax
alignof( type )
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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.The text has been machine-translated via Google Translate.
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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
[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) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| (C++11) |
Ruft den Type der Alignment-Anforderungen Original: obtains the type's alignment requirements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Klassen-Template) |
