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friend specifier

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Lenguaje C++
Los temas generales
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General topics
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Control de flujo
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Flow control
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Sentencias condicionales ejecución
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Conditional execution statements
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Instrucciones de iteración
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Iteration statements
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Ir declaraciones
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Jump statements
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Funciones
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Functions
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declaración de la función
lambda declaración de la función
función de plantilla
especificador inline
especificaciones de excepción (obsoleto)
noexcept especificador (C++11)
Excepciones
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Exceptions
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Los espacios de nombres
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Namespaces
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Tipos
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Types
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decltype specifier (C++11)
Los especificadores
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Specifiers
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cv especificadores
almacenamiento duración especificadores
constexpr especificador (C++11)
auto especificador (C++11)
alignas especificador (C++11)
Inicialización
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Initialization
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Los literales
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Literals
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Expresiones
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Expressions
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representaciones alternativas
Utilidades
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Utilities
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Tipos
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Types
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typedef declaration
alias de tipo de declaración (C++11)
atributos (C++11)
Lanza
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Casts
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conversiones implícitas
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
C-cast estilo y funcional
De asignación de memoria
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Memory allocation
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Clases
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Classes
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amigo especificador
listas de inicializadores
Clase propiedades específicas de la función
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Class-specific function properties
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Funciones especiales miembro
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Special member functions
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Plantillas
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Templates
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clase de plantilla
función de plantilla
plantilla de especialización
paquetes de parámetros (C++11)
Varios
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Miscellaneous
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Montaje en línea
 

[editar] Descripción

La palabra amigo se usa para conceder acceso a los miembros de la clase desde fuera de la clase. Por ejemplo, suponga que su clase tiene miembros privados o protegidos. Se puede acceder a estos miembros sólo de la misma clase o clases derivadas respectivamente. Mediante el uso de la palabra clave amigo le otorga acceso a los miembros privados y protegidos de la clase a la función de un amigo o un amigo de clase. Algunos de los usos más comunes de amigo son el operador >> y << funciones de operador y de la función de intercambio .
Original:
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] Ejemplo de uso

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