Instances are created by calling the class object as a function.

实例是将类对象作为函数调用而创建的。

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It then calls the friend function spacefriend and passes the class object address as its argument, and calls the template function, beginning with integer types and then floating data types.

然后，调用友元函数spacefriend并将类对象的地址作为其参数传递。然后调用template函数，先使用整数类型，然后使用浮点数据类型。

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It will pass the event object to that function as its argument.

它将事件对象作为参数传递给这个函数。

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