I made some small changes to this code - added a main function file, 
some definitions in Heap.h, and skeleton versions of Data.h and Data.cpp.

This package should now compile with the command 

g++ *.cpp

However, you should still view it as a collection of code, parts of which
you can decide to use or not, depending on your design of a solution.  

Some code here may be useful to you exactly as it is.  Some may be useful,
but only after you make changes.  Other parts may not be useful to you.