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OK, so generic, policy-based programming is a possible alternative to classic OO. Can you recommend a few free thematic resources?

The book "Elements of Programming" is a good read, http://www.elementsofprogramming.com/, although it's a bit theoretical.

While the book isn't free, this blog thoroughly covers the book and the lessons learned from it in a lecture series:

Modern C++ Design by Andrei Alexandrescu, for one.

How is this free?