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。
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。
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