如何创建链接多个访问器的函数？

Question

I want to create a function where I can chain accessors, but don't know how.

For example, I have a class A which has a subclass save , and attached to that save class I have two methods B() and C() :

class A {
    class save {
       function B() {};
       function C() {};
 }
}

I would like to be able to call them like so: A.save.B(); , or A.save.C();

Answer 1

I think what you're looking for is the keyword static . This (roughly) allows things to exist without an instance (or without an instance of the enclosing class in your case).

Something like:

class A {
    static class save {
        static void A() {
            // ...
        }

        static void B() {
            // ...
        }
    }
}

would allow you to call the defined methods as:

A.save.A(); /* or */ A.save.B();

The point being that the save class being static means that you can access it without having an instance of the enclosing A class . And the methods within the save class being static mean they can be invoked without an instance of the save class .

(As a side note, classes are almost universally given names starting with a capital, and methods names starting not with a capital. Your naming convention will confuse anyone coming to use your code.)