atomic_fetch_sub, atomic_fetch_sub_explicit
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<metanoindex/>
<tbody> </tbody>| definiert in Header <stdatomic.h>
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C atomic_fetch_sub( volatile A* obj, M arg ); |
(1) | |
C atomic_fetch_sub_explicit( volatile A* obj, M arg, memory_order order ); |
(2) | |
Atomar ersetzt den Wert von hingewiesen
obj mit dem Ergebnis der Subtraktion arg vom alten Wert obj, und gibt den Wert gehalten obj zuvor. Die Bedienung ist Lese-Modifizier-Schreib-Vorgang. Die erste Version Bestellungen Speicher zugreift nach memory_order_seq_cst, greift die zweite Version Bestellungen Speicher gemäß order .Original:
Atomically replaces the value pointed by
obj with the result of subtraction of arg from the old value of obj, and returns the value obj held previously. The operation is read-modify-write operation. The first version orders memory accesses according to memory_order_seq_cst, the second version orders memory accesses according to order.The text has been machine-translated via Google Translate.
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Dies ist ein für alle atomaren generische Funktion Objekttypen definiert.
A ist der Typ eines atomaren Objekts ist M entweder der nicht-elementaren Typ entsprechend A wenn A ist atomar Integertyp oder ptrdiff_t wenn A ist atomar Zeigertyp .Original:
This is a generische Funktion defined for all atomic object types.
A is the type of an atomic object, M is either the non-atomic type corresponding to A if A is atomic integer type, or ptrdiff_t if A is atomic pointer type.The text has been machine-translated via Google Translate.
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Für Ganzzahl-Typen wird arithmetische definiert, um zwei-Komplement-Darstellung zu verwenden. There
Original:
For signed integer types, arithmetic is defined to use two’s complement representation. There
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keine undefinierten Ergebnissen. Für Zeigertypen, kann das Ergebnis eine undefinierte Adresse, aber die Operationen sonst keine undefinierten Verhalten .
Original:
are no undefined results. For pointer types, the result may be an undefined address, but the operations otherwise have no undefined behavior.
The text has been machine-translated via Google Translate.
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Parameter
| obj | - | Zeiger auf den atomaren Objekts zu ändern
Original: pointer to the atomic object to modify The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| arg | - | der Wert von dem Wert im atomaren Objekt gespeichert subtrahieren
Original: the value to subtract from the value stored in the atomic object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| order | - | der Speicher-Synchronisation Bestellung für diesen Vorgang: Alle Werte sind zulässig
Original: the memory synchronization ordering for this operation: all values are permitted The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Rückgabewert
Der Wert gehalten zuvor die atomare Objekt, auf das
obj sein .Original:
The value held previously be the atomic object pointed to by
obj.The text has been machine-translated via Google Translate.
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Siehe auch
atomic hinaus Original: atomic addition The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (Funktion) | |
C++ documentation for atomic_fetch_sub, atomic_fetch_sub_explicit
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