friend function Friend的意思|示意

To create a friend function such as friend int Class2: : friendop (int x), where Class2 is the class in which the function friendop is defined, perform these steps.

要创建一个友函数：friend int Class2： friendop (int x)，同时该函数的友好性被定义在class2中，请您执行下述步骤。

To generate a C++ friend function that is a friend of a class, you need to create a UML operation within a UML Class and apply the cpp_operation stereotype on the UML operation.

为了在一个类中创建一个 C++ 友函数，您需要在一个 UML 类的内部创建一个 UML 操作，并且将 cpp_operation 套用在该 UML 操作上面。

A friend function named spacefriend, which is a friend of class space, and which takes the class object as an argument and prints the value of its variable x.

名为spacefriend的友元函数，它是space类的友元，它的参数是类对象，输出类对象的x变量的值。