It's a simple algorithm implemented in C++ with intentionally heavy usages of classes, inheritance, encapsulation, and polymorphism.

There is a stock of items with prices and total amounts. There is a shopping cart, where some of the items are placed. Then, the cart is recalculated with an intent of delivery to certain territory. Some items get a discount. Then, the cart is sent to the customer and the total price of it is calculated.

To run it, just do:

$ make
$ ./bin/objects.a

To run inside Docker (here -m=10M allows the container to use only 10Mb of memory):

$ docker build . --tag=carts
$ docker run -it -m=10M carts

If you want to step into Docker container and run the app manually, do this:

$ docker run -it --entrypoint=/bin/bash carts