Evolving a Nice Trick
summary
A concrete evolution: a generic "close enough" comparator is implemented from C++98 to C++20, starting with tag dispatching and hand‑rolled type traits that compile on ancient toolchains, moving through std::type_traits and enable_if, adding a constexpr abs and compile‑time tests, then using variable templates and generic lambdas, and ending with if consteval and concepts plus common_type so mixed float/integral cases work. The claim is tangible (one function becomes a constrained, debuggable overload), the tools are real, static_asserts prove it at compile time, and the implementation is small, efficient and testable.
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chapters (15)
- 0:00Introduction
- 2:27The problem
- 5:15The goal
- 10:25Nonintrusive solutions
- 13:17Functions
- 14:30Traits
- 19:03Comparison
- 21:05Changes
- 27:52Algorithms
- 31:42Generics
- 35:32Values
- 39:17Recap
- 40:41Simon Says 20
- 41:54Concepts
- 51:16Questions
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