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Beautiful Type Erasure with C++26 Reflection
TL;DR
C++26 reflection enables a new library, duck, that simplifies type erasure, eliminating boilerplate code while maintaining performance. By declaring interfaces once, developers can leverage automatic vtable generation and other features.
✦ Why It Matters
Engineers can adopt the duck library to simplify type erasure in their C++ projects today.
Key Takeaways
- Explore the duck library for simplified type erasure.
- Utilize C++26 reflection to reduce boilerplate code.
- Implement owning and non-owning semantics in your projects.
- Leverage automatic vtable generation for performance improvements.
Full Summary
Type erasure in C++ can often lead to cumbersome code, especially when moving beyond basic types like std::any or std::function. The duck library utilizes C++26's reflection capabilities to streamline this process, allowing developers to declare interfaces just once.
It generates virtual tables (vtables) automatically, which enhances performance and reduces the potential for errors. Features include owning and non-owning semantics, interface composition, and extensions for third-party types.
Currently, support is limited to gcc with specific flags for C++26 reflection. The article explores advanced techniques such as tag generation and overload resolution that contribute to duck's efficiency.
This innovation allows engineers to write cleaner, more maintainable code while harnessing the power of modern C++.