cxx
A safe, zero-overhead FFI bridge for calling C++ code from Rust and Rust code from C++.
What is cxx?
CXX is a library that provides a safe Foreign Function Interface (FFI) mechanism for interoperability between Rust and C++ code. It eliminates the risks associated with unsafe C-style bindings by enabling developers to call functions and use native types from either language while maintaining 100% safety on the Rust side. The library performs compile-time checks on FFI boundaries to uphold language invariants and operates with zero overhead.
Rust developers who need to integrate with existing C++ codebases or libraries, and C++ developers looking to incorporate Rust components into their projects while ensuring memory safety. It's particularly valuable for teams maintaining mixed-language systems where safety and performance are critical.
Developers choose CXX over alternatives like bindgen or cbindgen because it guarantees safety on the Rust side without runtime overhead, using static analysis to prevent common FFI errors. Its unique selling point is providing idiomatic type support (like Rust's String/Vec and C++'s std::string/std::vector) while maintaining a zero-cost abstraction, unlike serialization-based approaches.
Overview
Safe interop between Rust and C++
Use Cases
Best For
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