rust-const

Write Rust const functions and const generics for compile-time computation.

44|7|Updated Jan 22, 2026

Search Tags:#performance #validation #rust #compile-time #const generics #const fn

Ready to run

npx skills add https://github.com/huiali/rust-skills --skill rust-const

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: rust-const
Source: https://github.com/huiali/rust-skills/tree/main/.codex/skills/rust-const
Command: npx skills add https://github.com/huiali/rust-skills --skill rust-const

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes scripts (resource) and references (resource) components.

What problem does it solve?

This Skill helps developers move runtime checks and invariants to compile-time, ensuring greater safety, performance, and correctness in Rust code.

Core Features & Use Cases

Const Generics: Define types and functions that are generic over compile-time constants (e.g., array sizes).
Const Functions (const fn): Write functions that can be evaluated at compile time, enabling zero-cost computations.
Compile-Time Validation: Use assert! within const fn to enforce constraints during compilation.
Use Case: Optimize a fixed-size buffer implementation by using const generics for its size, ensuring it's checked at compile time and has no runtime overhead.

Quick Start

Use the rust-const skill to demonstrate a const fn for calculating Fibonacci numbers.

Frequently Asked Questions about rust-const

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I move runtime validation checks to compile time in Rust?▼

Const generics in Rust allow you to define types and functions generic over compile-time constants like array sizes. This enables fixed-size buffer implementations with compile-time size checks, ensuring zero-cost abstractions and no runtime overhead.

Can I use const fn for zero-cost computations and performance optimization?▼

Compile-time validation in Rust shifts runtime invariant checks to compilation using `assert!` within `const fn`. This enforces API constraints during the build process, guaranteeing safety and eliminating runtime overhead for those checks.

How do I use const generics for fixed-size buffer implementation in Rust?▼

Do I need any external dependencies to enable compile-time computation in Rust?▼

No external dependencies are required to enable compile-time computation. The Skill leverages Rust's native const evaluation capabilities, using built-in const generics and const functions to provide static guarantees directly through the standard compiler.

What are the limitations of using const fn for compile-time guarantees?▼

Limitations of `const fn` stem from Rust's const evaluator constraints, restricting complex computations, heap allocations, and certain system-level operations. You cannot use features unsupported by the compiler's compile-time evaluation environment.