dtolnay/cxx

Health v2 · maintenance only

Adoption not part of the score

6810 stars · 419 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

CXX is a Rust library providing a safe, statically analyzed foreign function interface between Rust and C++. It generates zero-overhead bridge code on both sides from a single shared description of the FFI boundary, with idiomatic bindings for standard library types.

Use cases

• call C++ code from Rust safely
• expose Rust functions to a C++ application
• generate Rust bindings for a C++ library
• avoid unsafe C-style FFI bindings
• integrate Rust into an existing C++ codebase
• bridge Rust String and Vec with std::string and std::vector

When to choose

• you need bidirectional Rust/C++ interop with memory safety guarantees
• you want zero-overhead FFI without serialization or copying
• you need idiomatic bindings for standard library types like unique_ptr and Box
• your build uses Cargo, Bazel, or Buck and you want generated bridge code

When to avoid

• you only need bindings for C, not C++ (bindgen may suffice)
• you need to interop with languages other than C++
• your C++ code uses templates or features outside CXX's supported type regime

Facets

library · maturity stable

compiler developer-tools concurrency developer-tools programming-languages cross-platform rust cpp cross-platform ffi interop code-generation bindings c-plus-plus build-tool

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