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friend specifier

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[editar] Descrição

A palavra-chave amigo é usado para conceder acesso a membros da classe de fora da classe. Por exemplo, suponha que sua classe tem membros privados ou protegidos. Você pode acessar esses membros apenas a partir de uma mesma classe ou classes derivadas respectivamente. Ao usar a palavra-chave amigo que você conceder acesso aos membros privados e protegidos de sua classe para a função de amigo ou de uma classe amigo. Alguns dos usos mais comuns de amigo são o operador >> << e funções de operador e da função swap.
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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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[editar] Exemplo da utilização

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