C++Now 2021

The constexpr metaprogramming model, which involves annotating code with indicators of compile-time or run-time suitability, has been steadily increasing in capabilities since its debut in C++11. These efforts have been in support of the stated goal of making metaprogramming accessible to even novice developers. Unfortunately, the result is a complicated and unintuitive programming model. Elsewhere, an extremely compelling alternative that is intuitive and more powerful has been implemented in Sean Baxter's circle compiler. This talk describes the limitations of the constexpr metaprogramming model and introduces its persuasive alternative, circle metaprogramming.