code and algorithm design

[mathtester]

Comments and observations

• Hashmap, as a storage of processed quads, should be either global variable or singleton.
• The code is a fat class/function + many small pieces of classes/functions. The functionalities should be push down to basic classes like quad.
• Ideally, serial/OpenMP/MPI should be implemented in a well-designed package. Hopefully overloading operators * and -> can be implemented in a way to accommodate MPI and OpenMP.
• For some threshold T like 2^20, serial calculation for quad smaller than T should be performed locally. Quad larger than T can be computed in parallel.