Writting c++ library

[dearvivekkumar]

Hi
I am to have some experience on writing c++ library which must be cross-platform(at-least on Linux, mac and window) for purpose of learning. I have gone through the explain on msdn for window("walkthrough for creating static and dynamic library).
Now on Mac I am using XCode, also I am not very comfortable in using xcode as I am new to this IDE, Also I want to explore this IDE too.
I need some suggestion for starting this, what would be the best approach, starting point for creating Mac specific libraries using xcode.
It would be very helpful if someone can provide some useful opinion.

Thanks a lot!

[HenriK]

The first thing is to ask: for what purpose are you writing this cross-platform C++? What goal you would you like to achieve with this project? What do you want to do with it?

[dearvivekkumar]

I want to learn writing libraries.
For this I am planning to go with filesystem