From NDC Oslo 2015:

Fundamentals of Type-Dependent Code Reuse

by Mark Isaacson

About the video:

This talk surveys different code reuse problems that can be solved by leveraging type information. Mark talks about how you can optimize your algorithms so that certain types use a "fast path", all while hiding that complexity from your users. He also talks about various ways to create "opt-in" functions for your classes. The talk is accessible to novices but builds gradually to complex ideas, including a theoretical C++17 "Mixer" class that allows users to add arbitrary functions to any type, including ints, on an instance by instance granularity.