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Software Engineering
Rust Blog·3 min read
Announcing Rust 1.95.0
TL;DR
Rust developers previously relied on the external cfg-if crate to conditionally compile code based on configuration predicates at compile time. Rust 1.95.0 introduces cfg_select!, a built-in macro that provides equivalent functionality with different syntax, acting as a compile-time match statement.
✦ Why It Matters
Engineers can now use cfg_select! to simplify conditional compilation without external dependencies, reducing build complexity.
Key Takeaways
- Use cfg_select! for cleaner conditional compilation.
- Implement if-let guards in match expressions for better variable access.
- Check stabilized APIs for new functionalities in constant contexts.
- Update your Rust installation to access the latest features.
How It Works
The cfg_select! macro evaluates configuration predicates at compile time, allowing developers to define platform-specific implementations in a concise manner.
It expands to the first matching arm, streamlining the process of writing conditional code based on the target environment.