$ show sentomk/patternia
Patternia is a header-only C++ library providing zero-overhead pattern matching with algebraic data types, structural matching, and extensible DSL. It leverages template metaprogramming to compile patterns into efficient switch-like code, eliminating runtime overhead for simple cases. The library includes a comprehensive test suite, benchmarks comparing against standard alternatives, and documentation. Its architecture emphasizes expression guards, combinators, and optimization passes, making it suitable for performance-critical applications requiring pattern matching.
The LLM identified 3 files worth highlighting for reuse:
Implements guard predicates using expression templates to enable user-defined conditions in pattern matching without runtime overhead. Demonstrates advanced metaprogramming for DSL embedding and could be reused in other domains requiring compile-time expression evaluation.
Contains optimization logic that lowers pattern matching to efficient switch/jump tables at compile time. Showcases sophisticated template analysis to detect optimizable patterns (e.g., literal ranges, variant tags) and generate optimal code. Techniques could apply to other compile-time code generation problems.
Provides `any()` and `all()` combinators for composing patterns in a functional style. Implements generic, decoupled abstraction for pattern composition that works across pattern types. Represents clean, reusable higher-order function design applicable beyond pattern matching.