Comparison
Rust vs C++ on Windows — full comparison
| Factor | Rust | C++ |
|---|---|---|
| Memory safety | Compile-time enforced — no use-after-free, no data races | Manual — developer responsible; sanitizers help |
| Performance | Equivalent to C++ — zero-cost abstractions | Equivalent to Rust — highly optimised |
| Concurrency | Data race freedom guaranteed by type system | Manual; sanitizers and careful design required |
| Windows API access | windows-rs (official Microsoft crate) | Native — Win32 headers, COM, WinRT |
| Build system | Cargo — integrated, reproducible | CMake, MSBuild, Premake — fragmented ecosystem |
| Binary size | Similar — LTO produces small binaries | Similar — LTO, LTCG available |
| Compile speed | Slower (borrow checker analysis) | Faster incremental builds |
| Learning curve | Steep — ownership, lifetimes, borrowing | Steep — UB, manual memory, templates |
| Ecosystem | Growing — strong async, WebAssembly | Mature — decades of libraries |
| Interop | C FFI, CXX crate for C++ interop | Native C, WinRT, COM |
Choose Rust when
When to choose Rust over C++
- Memory safety is critical — security-sensitive code, network services, parsers where bugs have severe consequences
- New project from scratch — Rust's tooling (cargo, clippy, rustfmt) is more ergonomic for greenfield work
- Async/concurrent systems — Rust's type system prevents data races at compile time
- WebAssembly target — Rust has the best Wasm tooling in the systems language space
- Cross-platform — single codebase compiles to Windows, Linux, macOS and Wasm with minor adjustments
Choose C++ when
When to choose C++ over Rust
- Existing C++ codebase — gradual migration is possible but interop has overhead
- DirectX / game development — C++ has mature DirectX 12 SDKs and middleware (Unreal, Unity plugins)
- Team expertise — if your team knows C++ well and timelines are tight
- Faster compile times needed — C++ incremental builds are faster than Rust's
FAQ
Rust vs C++ questions
Is Rust faster than C++ on Windows?
They are equivalent in performance. Both compile to optimised native code via LLVM. Rust's zero-cost abstractions mean high-level Rust code compiles to the same machine code as equivalent C++. Benchmarks show Rust and C++ within a few percent of each other for CPU-bound tasks.
Can Rust replace C++ for Windows desktop development?
Yes for new projects. Microsoft itself uses Rust in Windows kernel components, the Azure cloud stack, and developer tools. The windows-rs crate provides complete Win32 and WinRT API access. The main gap vs C++ is in DirectX 12 tooling and game middleware integration.