doodling with youtube

Everybody is aware of google doodles. You can have list of all their Logos.

Valentine's day doodle of Google search page

They had a their modified logo for valentine's day.

Valentine's day doodle of youtube

Anyone hardly notices a small change in youtube doodle. They have replaced their logo with valentine's day message.

The CPP questions

Templates

• Create a class that provides singleton feature to derived classes. What are problems faced here?

Pipes and Filters Architecture pattern

• How to control the data flow between various filters? Assume the data queue between filters is of length 1. What are the various synchronization techniques to control the data movement?

Copy constructor

• Why Copy constructor parameters are constant references? How do auto pointers solve the problem of multiple references? What are temporary variables?

Remembering OSI layer protocols

I always wanted to remember the layers in OSI reference model. My wife found something on net that makes easy to remember all 7 layers:

All People Seems To Need Data Processing

Word	OSI Layer
All	Application
People	Presentation
Seems	Session
To	Transport
Need	Network
Data	Data Link
Processing	Physical