From C++ to Rust

As vehicle software systems grow more complex, memory safety and performance are no longer nice-to-haves. They’re critical requirements!

But how can OEMs and suppliers introduce modern, safer languages like Rust without disrupting existing C++ architectures?

In this white paper, you’ll learn how Critical Software tackled this exact challenge by refactoring the logging module of vSomeIP, a widely adopted open-source middleware implementation developed with the BMW Group.

You’ll discover:

• Why the original C++ implementation struggled with performance and thread contention
• How Rust’s concurrency model eliminates bottlenecks while improving safety
• The tools that make Rust–C++ interoperability possible (like cxx and corrosion)
• Benchmark results comparing C++, refactored C++, and Rust implementations
• Why DLT logging presents unique performance challenges—and how to manage them
• How this approach serves as a blueprint for introducing Rust in safety-critical environments