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friend specifier

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Funktionen
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Functions
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Types
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decltype specifier (C++11)
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Specifiers
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Types
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Types
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typedef declaration
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Classes
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Classes
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Freund Spezifizierer
Initialisierer Listen
Class-spezifische Funktion Eigenschaften
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Class-specific function properties
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Besondere Member-Funktionen
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Special member functions
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Templates
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Templates
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Klassen-Template
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Inline Montage
 

[Bearbeiten] Beschreibung

Der Freund Schlüsselwort wird verwendet, um den Zugriff auf die Mitglieder von außerhalb der Klasse zu gewähren. Angenommen, Ihre Klasse private oder protected Mitglieder. Sie können diese Elemente nur aus der gleichen Klasse oder abgeleiteten Klassen jeweils zugreifen. Durch die Verwendung der Freund Schlüsselwort, das Sie gewähren Zugang zu den private und geschützte Member der Klasse der friend-Funktion oder einen Freund Klasse. Einige der häufigsten Anwendungen von Freund sind die operator >> und operator << Funktionen und die Swap-Funktion .
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The friend keyword is used to grant access to class members from outside of the class. For example, suppose your class has private or protected members. You can access these members only from the same class or derived classes respectively. By using the friend keyword you grant access to the private and protected members of your class to the friend function or a friend class. Some of the more common uses of friend are the operator>> and operator<< functions and the swap function.
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[Bearbeiten] Beispiel für die Verwendung

friend ostream& operator<<(ostream& out, const T& o);
friend istream& operator>>(istream& in, T& o);
friend swap(T& left, T& right);