TODO.md

These are things that need implementation:

Nearest:

• add epsilon (smoothing factor) to forces count in SimpleNBody generator
• add Runge-Kutta method for numerical integration in SimpleNBody (most likely would use enum for this)
• create tests for basic ScalarQuantity and VectorQuantity functions
• implement custom error class in order to get rid of &'static str or String in each Result
• add check_compatability method to quantities

In more distant future:

• add more integrators (Barnes-Hut algorithm at least) and generators (Solar system at least)
• use multithreading to increase perfomance
• use C++ code to increase perfomance
• use GPU (primarily, CUDA or OpenCL) to increase perfomance
• add CLI
• add some UI (probably, using python's matplotlib, SDL in C++ or even REST API)
• add unit tests for integrators and generators
• add documentation

Completed things:

• implement all operations on quantities and prepare unit tests for each of them

Thoughts

• It would be good to create a way that forces integrators and generators to use quantities of specific types; for example, radius of the Plummer sphere must be in meters (or equivalent) and in nothing else. If it would be in compile-time - it would be great.
• Probably I should move SI struct to core module and make something like System trait which should somehow deal with different systems like SI, CGS and so on
• Maybe move Euler (or other) method to separate struct and call it from the integrators