The append_features method of Module

In the same way that the class could include some singleton methods,the Module could include some singleton methods,too.But if we implement a class which include a Module which contians some singleton methods,does these methods become to the class's singleton methods?The answer is 'no'.There is a hook called append_features that we can override.It's called with a parameter that is the destination class or module.For an example of its use,see the following codes:

ruby 代码

 

1. module MyMod  
2.   def MyMod.append_features(someClass)  
3.     def someClass.modmeth  
4.       puts "Module (class) method"  
5.     end  
6.     super  
7.   end  
8. end  
9. class AppendFeatures  
10.   include MyMod  
11.   def initialize  
12.       
13.   end  
14. end  
15.   
16. AppendFeatures.modmeth  

Note:
you should call the "super" when you override the append_features method.

It's very interesting.
These code copy from the <ruby way=""> book.</ruby>