CppCon 2019

This talk, based on Arthur's blog post ["What is Type Erasure?"](https://quuxplusone.github.io/blog/2019/03/18/what-is-type-erasure/), will explain the notion of type erasure as seen in standard library types such as std::function and std::any. We'll see how to build the most naive form of type erasure using heap allocation and virtual functions; then iteratively optimize that design to improve its performance. At the extreme, we'll see how C++2a std::function_ref achieves trivial copyability.

Attendees will leave this session confident in their ability to implement type-erased classes, such as std::function, from scratch.