Policy-based design in C++20
summary
Policy-based design claims to replace runtime strategy objects with compile-time policy classes so a cable‑box example for DVB/DRM composes players, locks and protection without virtual tables. It uses templates, Boost.Hana style metafunctions, the detection idiom, concepts and simple type‑erasure via converting shared_ptr constructors to avoid boilerplate. The demo composes hybrid CAS+DRM protection by inheriting small policies, compiles when used and lets unused methods remain uninstantiated so errors only appear when invoked.
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chapters (8)
- 0:00Start
- 7:14Strategy pattern (example)
- 28:19Templates in C++ (meta functions)
- 40:56Strategies vs. Policies
- 45:40(Expression) SFINAE
- 49:37Detection idiom
- 54:00Concepts
- 59:58Type erasure
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