All little Saturday things

I confess — I am a traitor. Over a week ago I enrolled in Coursera course “Discrete Optimization” by Prof. Pascal Van Hentenryck and it is frustratingly interesting if I may say that. Since I love computational challenges I was hooked in since the first assignment. I tried to keep the weekend only for Skila, but I failed — writing one thing, and thinking about other makes no sense, so I switched and worked on DO almost entire Sunday. But don’t despair, I am a thorough guy, I wrote down how many hours I borrowed from Skila.

It doesn’t mean I did nothing — however only a little additions and improvements:

  • I optimized backend in case of non-virtual types (simply no virtual table),
  • in backend layer interfaces are classes with empty methods — this allows to safely call a method when derived class hides it,
  • I added standalone functions — this required surprisingly some work,
  • I already mentioned covariance when it comes to polymorphic methods,
  • Skila supports 4 types of expressing the base for numbers like in Python — “124” for decimal, “0xCAFE” for hexadecimal, “0o57” for octal and “0b010101” for binary,
  • numbers can be expressed with padding as in Ruby — “450_010” is exactly the same as “450010” only reading is easier,

Next point is exposing back shadowed methods — I have in mind three cases:

using base::foo(Int);
using base::foo(*);
using base::foo;

The first one brings up method foo with given signature, joker “*” in the second line brings all foo methods. And third one is a shortcut — if there is only one method foo in inherited class it will be brought up. If there are more — compiler will give you an error.

And that’s all for the Saturday, I am running back to DO assignments…

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