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Inhaltsverzeichnis

[Bearbeiten] Überladen von Operatoren

[Bearbeiten] Syntax

type operator op ( params ) ;

[Bearbeiten] Erklärung

  • <type> ist / sind die Art (en) der Variablen .
    Original:
    <type> is/are the type(s) of the variables.
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  • <op> die jeweiligen Betreiber (zB +, +=, <<, >>, &&, ||, %, etc.) .
    Original:
    <op> is the particular operator (e.g. +, +=, <<, >>, &&, ||, %, etc.).
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  • <params> ist / sind der Name (n) der erforderlichen Parameter (abhängig vom Netzbetreiber) .
    Original:
    <params> is/are the name(s) of the required parameters (depends on the operator).
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[Bearbeiten] Einschränkungen

  • Sie können keine neuen Operatoren wie ** oder &| .
    Original:
    You cannot create new operators such as ** or &|.
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  • Nicht alle Operatoren können überladen werden
    Original:
    Not all operators can be overloaded
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  • Einige Betreiber kann nur als nicht statische Klasse Mitglieder überlastet werden
    Original:
    Some operators can only be overloaded as non-static class members
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  • Kurzschluss-Auswertung nicht mit überladenen Operatoren arbeiten
    Original:
    Short-circuit evaluation doesn't work with overloaded operators
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[Bearbeiten] Operator Anrufe

Überladene Operatoren Aufruf erfolgt über den üblichen Infix-Notation werden
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Overloaded operators can be called using the usual infix notation
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a+b
oder eine Funktion-ähnlichen Notation
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or a function-like notation
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operator+(a,b)

[Bearbeiten] Beispiel

#include <iostream>
 using namespace std;
 
 class Fraction{
   private:
     int numerator, denominator;
 
   public:
     Fraction(int n, int d): numerator(n), denominator(d) {}
   // Note that the keyword operator combined with an actual
   // operator is used as the function name
   friend ostream& operator<<(ostream&, Fraction&);
 };
 
 ostream& operator<<(ostream& out, Fraction& f){
   out << f.numerator << '/' << f.denominator;
   return out;
 }
 
 int main(){
   Fraction f1(3, 8);
   Fraction f2(1, 2);
 
   cout << f1 << endl;
   cout << 3 << ' ' << f2 << endl;
 
   return 0;
 }

Output:

3/8
3 1/2

[Bearbeiten] Siehe auch

Common operators
Abtretung an 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
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dynamic_cast wandelt virtuellen Basisklasse abgeleitet class
Original:
dynamic_cast converts virtual base class to derived class
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const_cast wandelt Typ kompatiblen Typ mit unterschiedlichen cv qualifiers
Original:
const_cast converts type to compatible type with different cv qualifiers
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reinterpret_cast wandelt Typ inkompatibel type
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reinterpret_cast converts type to incompatible type
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new ordnet memory
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new allocates memory
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delete freigibt memory
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delete deallocates memory
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sizeof fragt die Größe eines type
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sizeof queries the size of a type
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sizeof... fragt die Größe eines Parameter Pack (seit C++11)
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sizeof... queries the size of a Parameter Pack (seit C++11)
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typeid fragt die Typinformationen eines type
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typeid queries the type information of a type
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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)
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alignof Abfragen Ausrichtungsanforderungen eines Typs (seit C++11)
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alignof queries alignment requirements of a type (seit C++11)
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