What is safer casting in C?

It's a macro-based technique to make type casts explicit, compile-time checked, and error-prone ones impossible – all without runtime overhead.

Does safer casting in C add any performance cost?

Nope – expands to plain casts, verified by benchmarks showing identical assembly and speed.

How do I implement safer casting in my C project?

Grab Lenga's macros from the Medium post, drop in a header, replace casts, tweak for your compiler. Start small, one file.

💻 Programming Languages

Casts in C Just Got Safer – Zero Runtime Cost, But Will Coders Care?

Tired of C's silent casting disasters? A new technique claims to make them visible and safe at compile time, no speed hit. Here's why it might – or might not – change your game.

theAIcatchup Apr 08, 2026 3 min read

C code snippet demonstrating SAFE_CAST macro for safer type conversions

⚡ Key Takeaways

Safer casting macros in C enforce type safety at compile time with truly zero runtime cost. 𝕏
Elegant solution using typeof and _Generic, but faces adoption hurdles in legacy codebases. 𝕏
Potential to influence future C standards, bridging gap to safer languages like Rust. 𝕏

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#C programming #compile-time checks #safe casting #safer casting in C #type safety #zero cost abstractions #zero overhead #zero runtime cost

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Originally reported by Reddit r/programming

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