C++ Parallel Factorial

Fast ⚡ implementation of factorial written in C++.

I wrote this just to see what writing concurrent/parallel code is like in C++ and was pleasantly surprised compared to how awkward pthreads are in C. My experience with Rust and Rayon has still been significantly better.

Putting this out there just because, I wouldn't use this anywhere important though. It's probably riddled with bugs and the code quality is terrible, this being one of the first things I've ever written in C++ that kind of works.

Build

Required libraries and tools:

• clang
• cmake
• ninja
• gmp

Once these dependencies are satisfied, you can build by running:

$ mkdir release && cd release
$ cmake .. -G Ninja -DCMAKE_BUILD_TYPE=Release
$ ninja

and you can then run the resulting executable.

Test

To run the unit tests, build with the instructions above, then run the cpp-parallel-factorial binary in the tests folder.

How to Use

$ ./parallel-factorial <NUMBER>

The output will be written to stdout.