Using cross file dependancies

• A dependency is a relationship between two entities.

• Importing the header file sets strong dependancy. If the header file changes, all the files depending on header file need to re-compiled.

• Sometimes recompiling can take significant amount of time even with cluster os souped-up, intel based Xservers at your disposal.

• Recompiling issue can even get worse because dependancies are transitive, header files can be dependent on each other

• Although compilation can take a long time, at least Xcode keeps track of all dependencies for you.