solodon4/Mach7

Health v2 · maintenance only

Flags: no_releases no_license

Adoption not part of the score

1319 stars · 76 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Mach7 is a C++ library providing functional-programming-style pattern matching, supporting user-definable patterns, algebraic data types, and matching on open class hierarchies. It is implemented as a header-only library that brings ML/Haskell-like match expressions to C++ without language changes.

Use cases

• pattern matching in C++
• decompose algebraic data types in C++
• replace visitor pattern with match expressions
• match on class hierarchies without modifying them
• write functional-style code in C++
• destructure objects with nested patterns

When to choose

• you need expressive pattern matching on variants or class hierarchies in C++
• you want to simplify visitor-pattern-heavy code
• you need open class hierarchies that patterns can match without inheritance changes
• you want a header-only, dependency-free solution

When to avoid

• your compiler supports C++17/23 std::variant and std::visit or built-in pattern matching proposals
• you need a library with active development and recent maintenance
• you require a permissively licensed dependency (license is non-standard)
• you work in a codebase with strict compiler requirements that Mach7's template tricks may not satisfy

Facets

library · maturity maintenance

parser programming-language programming-languages developer-tools cpp cross-platform windows pattern-matching algebraic-data-types visitor-pattern variant functional-programming header-only open-class-hierarchies algorithms linux macos

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