operators

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[Bearbeiten] Überladen von Operatoren

[Bearbeiten] Syntax

[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

a+b

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;
 }

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[Bearbeiten] Siehe auch

• Operator Vorrang
• Alternative Syntax des Operators