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Learn practical strategies for designing user-friendly C++ libraries through a comprehensive conference talk that examines real-world experiences from building high-performance libraries over the past 3-4 years. Explore how C++20 features like concepts can improve template meta-programming accessibility while addressing common frustrations that developers face. Discover insights from three major library projects: EVE (a SIMD abstraction layer for performance and portability), KUMI (a reimagined tuple library with algorithmic support), and KIWAKU (a multi-dimensional array toolkit focused on efficiency and ergonomics). Master techniques for creating intuitive APIs including generating meaningful error messages through strategic use of static_assert versus concepts, avoiding complex template error stacks, and designing extension points that align with user expectations. Examine bold design decisions that challenge standard practices, including innovative approaches to CTAD (Class Template Argument Deduction) and function semantics options. Understand how proper implementation of C++20 features can significantly reduce development friction and increase code clarity for both library authors and users.
