Increment/decrement operators – cppreference.com

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Increment / Dekrement-Operatoren erhöht oder vermindert den Wert des Objekts .

Original:

Increment/decrement operators increments or decrements the value of the object.

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Operator name	Syntax	Overloadable	Prototype examples (for `class T`)
Operator name	Syntax	Overloadable	Inside class definition	Outside class definition
pre-increment	`++a`	Yes	`T& T::operator++();`	`T& operator++(T& a);`
pre-decrement	`--a`	Yes	`T& T::operator--();`	`T& operator--(T& a);`
post-increment	`a++`	Yes	`T T::operator++(int);`	`T operator++(T& a, int);`
post-decrement	`a--`	Yes	`T T::operator--(int);`	`T operator--(T& a, int);`
'Notes' Original: Notes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. Formen der Präfix der eingebauten Operatoren Rückkehr Referenzen und Postfix Formen Rückgabewerte und typischen benutzerdefinierten Überlastungen dem Muster folgen, so dass die benutzerdefinierten Operatoren in der gleichen Weise wie die Einbauten verwendet werden kann. Jedoch in einer benutzerdefinierten Operator Überlast kann jeder Typ als Rückkehr-Typ (einschließlich `void`) verwendet werden . Original: Prefix forms of the built-in operators return references and postfix forms return values, and typical user-defined overloads follow the pattern so that the user-defined operators can be used in the same manner as the built-ins. However, in a user-defined operator overload, any type can be used as return type (including `void`). The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. Die `int` Parameter eine Dummy-Parameter verwendet, um zwischen Prä-und Post-in-Versionen der Betreiber differenzieren. Wenn der Benutzer-definierten Postfix-Operator genannt wird, ist der Wert in diesem Parameter übergeben immer Null, obwohl es durch den Aufruf der Betreiber mit der Funktion Anruf Schreibweise geändert werden können, z. B. `a.operator++(2)` . Original: The `int` parameter is a dummy parameter used to differentiate between pre- and post- in versions of the operators. When the user-defined postfix operator is called, the value passed in that parameter is always zero, although it may be changed by calling the operator using function call notation, e.g. `a.operator++(2)`. The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Erklärung

Pre-increment und Prä-Dekrement Betreiber erhöht oder vermindert den Wert des Objektes und gibt einen Verweis auf das Ergebnis .

Original:

pre-increment and pre-decrement operators increments or decrements the value of the object and returns a reference to the result.

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Post-Inkrement und Post-Dekrement erstellt eine Kopie des Objekts, erhöht oder vermindert den Wert des Objektes und gibt die Kopie aus der Zeit vor dem Inkrement oder Dekrement .

Original:

post-increment and post-decrement creates a copy of the object, increments or decrements the value of the object and returns the copy from before the increment or decrement.

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Built-in Präfix-Operatoren

Für jedes wahlweise flüchtigen qualifizierte arithmetischen Typ A andere als bool, und für jeden wahlweise flüchtigen qualifizierte Zeiger P optional cv qualifizierte Objekttyp, die folgende Funktion Signaturen in Überladungsauflösung teilnehmen:

Original:

For every optionally volatile-qualified arithmetic type A other than bool, and for every optionally volatile-qualified pointer P to optionally cv-qualified object type, the following function signatures participate in overload resolution:

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`A& operator++(A&)`

`bool& operator++(bool&)`		(veraltet)

`P& operator++(P&)`

`A& operator--(A&)`

`P& operator--(P&)`

Der Operand eines eingebauten Präfix-Inkrement-oder Dekrement-Operator muss eine modifizierbare lvalue (non-const-Referenz) von nicht-boolean arithmetischen Typ oder Zeiger auf Objekt-Typ zu vervollständigen. Aus diesen Operanden, der Ausdruck ++x entspricht genau x+=1 ist, und der Ausdruck --x entspricht genau x-=1, das heißt, ist das Ergebnis der aktualisierte Operanden, wie L-Wert zurückgegeben und alle arithmetischen Umrechnungsregeln und Zeigerarithmetik Regeln definiert für arithmetischen Operatoren gelten .

Original:

The operand of a built-in prefix increment or decrement operator must be a modifiable lvalue (non-const reference) of non-boolean arithmetic type or pointer to complete object type. For these operands, the expression ++x is exactly equivalent to x+=1, and the expression --x is exactly equivalent to x-=1, that is, the result is the updated operand, returned as lvalue, and all arithmetic conversion rules and pointer arithmetic rules defined for arithmetischen Operatoren apply.

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Wenn der Operand des Prä-Inkrement-Operator ist vom Typ bool, wird es auf true (veraltet) .

Original:

If the operand of the preincrement operator is of type bool, it is set to true (veraltet).

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Built-in Postfix-Operatoren

Original:

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`A operator++(A&, int)`

`bool operator++(bool&, int)`		(veraltet)

`P operator++(P&, int)`

`A operator--(A&, int)`

`P operator--(P&, int)`

Der Operand eines eingebauten postfix Inkrement oder Dekrement-Operator muss eine modifizierbare lvalue (non-const-Referenz) von nicht-boolean arithmetischen Typ oder Zeiger auf Objekt-Typ zu vervollständigen. Das Ergebnis ist ein prvalue, die eine Kopie der ursprüngliche Wert des Operanden. Als Nebeneffekt, ändert dieser Operator den Wert des Arguments arg, als ob durch die Auswertung arg += 1 oder arg -= 1 für Inkrement-und Dekrement sind. Alle arithmetischen Umrechnungsregeln und Zeigerarithmetik Regeln für arithmetischen Operatoren gelten definiert .

Original:

The operand of a built-in postfix increment or decrement operator must be a modifiable lvalue (non-const reference) of non-boolean arithmetic type or pointer to complete object type. The result is a prvalue, which is a copy the original value of the operand. As a side-effect, this operator modifies the value of its argument arg as if by evaluating arg += 1 or arg -= 1, for increment and decrement respectively. All arithmetic conversion rules and pointer arithmetic rules defined for arithmetischen Operatoren apply.

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Wenn der Operand des Postinkrement Betreiber ist vom Typ bool, wird es auf true (veraltet) .

Original:

If the operand of the postincrement operator is of type bool, it is set to true (veraltet).

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Beispiel

#include <iostream>
int main()
{
    int n = 1;
    int n2 = ++n;
    int n3 = ++ ++n;
    int n4 = n++;
//    int n5 = n++ ++; // compile error
//    int n5 = n + ++n; // undefined behavior
    std::cout << "n = " << n << '\n'
              << "n2 = " << n2 << '\n'
              << "n3 = " << n3 << '\n'
              << "n4 = " << n4 << '\n';
}

Output:

n = 5
n2 = 2
n3 = 4
n4 = 4

Notes

Wegen der Nebenwirkungen beteiligt sind, müssen eingebaute Inkrement-und Dekrement-Operatoren mit Vorsicht verwendet werden, um undefiniertes Verhalten aufgrund von Verstößen gegen Sequenzierung Regeln vermeiden .

Original:

Because of the side-effects involved, built-in increment and decrement operators must be used with care to avoid undefined behavior due to violations of Sequenzierung Regeln.

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Da eine temporäre Kopie des Objekts während des Betriebs ausgebildet ist, Prä-Inkrement' oder' Prä-Dekrement Operatoren sind in der Regel effizienter in Kontexten, wo der zurückgegebene Wert nicht verwendet wird .

Original:

Because a temporary copy of the object is constructed during the operation, pre-increment or pre-decrement operators are usually more efficient in contexts where the returned value is not used.

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Standard-Bibliothek

Inkrement-und Dekrement-Operatoren sind für viele Standard-Bibliothek Typen überlastet. Insbesondere jeden Iterator Überlastungen operator + + und jede BidirectionalIterator Überlastungen Betreiber -, auch wenn diese Betreiber keine-ops für die jeweilige Iterator sind .

Original:

Increment and decrement operators are overloaded for many standard library types. In particular, every Iterator overloads operator++ and every BidirectionalIterator overloads operator--, even if those operators are no-ops for the particular iterator.

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Überladungen für arithmetische Typen Original: overloads for arithmetic types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

operator++ operator++(int) operator-- operator--(int)	erhöht oder vermindert den atomaren Wert um eins Original: increments or decrements the atomic value by one The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::atomic`) [edit]

operator++ operator++(int) operator-- operator--(int)	erhöht oder verringert die Anzahl der Ticks Original: increments or decrements the tick count The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::chrono::duration`)
Überladungen für Iterator-Typen Original: overloads for iterator types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

operator++ operator++(int)	Fortschritte der Iterator Original: advances the iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::raw_storage_iterator`)

operator++ operator++(int)	Fortschritte der Iterator Original: advances the iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::reverse_iterator`)

operator-- operator++(int)	Verringert den Iterator Original: decrements the iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::reverse_iterator`)

operator++ operator++(int)	no-op (öffentliche Elementfunktion of `std::back_insert_iterator`)

operator++ operator++(int)	no-op (öffentliche Elementfunktion of `std::front_insert_iterator`)

operator++ operator++(int)	no-op (öffentliche Elementfunktion of `std::insert_iterator`)

operator++ operator++(int)	Fortschritte der Iterator Original: advances the iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::move_iterator`)

operator-- operator--(int)	Verringert den Iterator Original: decrements the iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::move_iterator`)

operator++ operator++(int)	Fortschritte der istream_iterator Original: advances the istream_iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::istream_iterator`)

operator++ operator++(int)	no-op (öffentliche Elementfunktion of `std::ostream_iterator`)

operator++ operator++(int)	Fortschritte der istreambuf_iterator Original: advances the istreambuf_iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::istreambuf_iterator`)

operator++ operator++(int)	no-op (öffentliche Elementfunktion of `std::ostreambuf_iterator`)

operator++ operator++(int)	Fortschritte der regex_iterator Original: advances the regex_iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::regex_iterator`)

operator++ operator++(int)	Fortschritte der regex_token_iterator Original: advances the regex_token_iterator The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (öffentliche Elementfunktion of `std::regex_token_iterator`)

Siehe auch

Operator Vorrang

Common operators
Zuweisungen	incrementǊdecrement	Arithmetik	logisch	Vergleich	memberǊaccess	andererseits
`a = b a = rvalue a += b a -= b a *= b a /= b a %= b a &= b a \|= b a ^= b a <<= b a >>= b`	`++a --a a++ a--`	`+a -a a + b a - b a * b a / b a % b ~a a & b a \| b a ^ b a << b a >> b`	`!a a && b a \|\| b`	`a == b a != b a < b a > b a <= b a >= b`	`a[b] a &a a->b a.b a->b a.*b`	`a(...) a, b (type) a ? :`
Special operators
`static_cast` wandelt einem Typ in einen anderen kompatiblen Typ Original: `static_cast` converts one type to another compatible type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. `dynamic_cast` wandelt virtuellen Basisklasse abgeleitet class Original: `dynamic_cast` converts virtual base class to derived class The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. `const_cast` wandelt Typ kompatiblen Typ mit unterschiedlichen cv qualifiers Original: `const_cast` converts type to compatible type with different cv qualifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. `reinterpret_cast` wandelt Typ inkompatibel type Original: `reinterpret_cast` converts type to incompatible type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. `new` ordnet memory Original: `new` allocates memory The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. `delete` freigibt memory Original: `delete` deallocates memory The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. `sizeof` fragt die Größe eines type Original: `sizeof` queries the size of a type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. `sizeof...` fragt die Größe eines Parameter Pack (seit C++11) Original: `sizeof...` queries the size of a Parameter Pack (seit C++11) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. `typeid` fragt die Typinformationen eines type Original: `typeid` queries the type information of a type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. `noexcept` prüft, ob ein Ausdruck eine Ausnahme (seit C++11) werfen kann Original: `noexcept` checks if an expression can throw an exception (seit C++11) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. `alignof` Abfragen Ausrichtungsanforderungen eines Typs (seit C++11) Original: `alignof` queries alignment requirements of a type (seit C++11) The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Increment/decrement operators – cppreference.com

Erklärung

Built-in Präfix-Operatoren

Built-in Postfix-Operatoren

Beispiel

Notes

Standard-Bibliothek

Überladungen für arithmetische TypenOriginal: overloads for arithmetic typesThe text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Überladungen für Iterator-TypenOriginal: overloads for iterator typesThe text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Siehe auch

Überladungen für arithmetische Typen
Original:
overloads for arithmetic types
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Überladungen für Iterator-Typen
Original:
overloads for iterator types
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