Carbon (language)
by Google (experimental)
Carbon is an experimental, open-source programming language designed as a potential successor to C++, aiming to provide modern language features, memory safety improvements, and tooling while maintaining large-scale bidirectional…
Definition
Carbon is an experimental, open-source programming language designed as a potential successor to C++, aiming to provide modern language features, memory safety improvements, and tooling while maintaining large-scale bidirectional interoperability with existing C++ codebases. It was announced by Google in 2022 and remains under active, pre-stable development.
Overview
C++ is deeply entrenched in performance-critical software, but decades of accumulated features and legacy design decisions make it difficult to evolve toward modern safety and ergonomics without breaking compatibility. Carbon was announced by Google engineers in 2022 as an experiment in building a new language explicitly intended to succeed C++ for large codebases, rather than a general clean-slate systems language, prioritizing practical migration over ideological purity. Carbon's central design goal is bidirectional interoperability with C++: existing C++ code should be callable from Carbon and vice versa with minimal friction, allowing organizations with enormous existing C++ codebases to migrate incrementally, file by file, rather than requiring a full rewrite. This is a key differentiator from other 'C++ successor' languages like Rust, which offer strong safety guarantees but comparatively harder interoperability with existing C++ code. Beyond interoperability, Carbon aims to modernize the developer experience with cleaner generics, a more consistent and less ambiguous syntax than C++, faster build times, better tooling support, and a roadmap toward improved memory safety, though full memory-safety guarantees comparable to Rust are an explicit longer-term goal rather than a feature of the language today. As of its public development, Carbon is explicitly labeled experimental and not recommended for production use; it lacks a finalized specification, and its design is still evolving through open proposals on GitHub. Its long-term success depends on whether it can prove out its interoperability model at scale and reach language stability, positioning it as a longer-horizon bet in the same conceptual space as Rust, Zig, and other post-C++ systems languages, but distinguished by its incremental-migration-first philosophy.
Key Features
- Designed explicitly as a potential successor to C++, not a clean-slate language
- Bidirectional interoperability allowing C++ and Carbon code to call each other directly
- Aims to support incremental, file-by-file migration from existing C++ codebases
- Modernized generics and a cleaner, less ambiguous syntax than C++
- Open, RFC-driven design process hosted publicly on GitHub
- Longer-term roadmap toward improved memory safety
- Explicitly labeled experimental with no finalized language specification yet
- Backed initially by Google engineers, developed as an open-source community project