Good example of decorator pattern

Question

Hi

Every one mostly talks about decorator pattern with pizza example.

I got idea about usage of this pattern as it helps avoid class explosion.

However, Could someone please suggest a good example apart from pizza for decorator pattern?

Answer 1

Ketan Lalcheta ,

Please add a python tag.

Two good examples of real-world uses of Python decorators I saw on YouTube were timing how long a function takes to execute and writing a log entry every time a function executes.

Answer 2

Ketan Lalcheta ,

OK. I see.

"The DecoratorPattern is a pattern described in the [1994] DesignPatternsBook. ... This is not to be confused with PythonDecorators ..." --
https://wiki.python.org/moin/DecoratorPattern

How unfortunate that the names are so similar.

Answer 3

Yeah. Thats why I had not tagged any language as this is generic to all. Also , i had no sample code for this question to make it specific to any language.

Answer 4

Rain i am afraid it is not the same thing.

Python decorators are related to functions. This is related to design patterns and class where we avoid multiple classes.

Answer 5

Ketan Lalcheta ,

What is not the same thing?

Answer 6

You are talking about decorator from python. This is the concept which is applied to functions. AFAIK, method / function decorator is limited to Python only. Is this correct?

Now, coming to my query. My concern is not related to function decorators. This is a generic concept applicable to all object oriented programming language.