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friend specifier

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Special member functions
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インラインアセンブリ
 

[編集] 説明

Friendキーワードは、クラスの外からクラスのメンバへのアクセスを許可するために使用されます。たとえば、あなたのクラスはプライベートまたはプロテクトメンバーを持っているとします。あなただけのそれぞれ同じクラスまたは派生クラスからこれらのメンバーにアクセスできます。 Friendキーワードを使用することで、friend関数やfriendクラスにクラスのプライベートメンバやプロテクトメンバへのアクセスを許可します。友人のより一般的な用途のいくつかは、演算子>>とoperator <<関数とスワップ機能です.
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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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[編集] 例を使用する

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