Use const generics in Rust by defining const parameters in structs or functions to enable compile-time specialization for values like array sizes.
Use const generics by adding a const parameter to your struct, enum, or function definition to allow compile-time values like array sizes. This enables the compiler to generate specialized code for each constant value used.
struct ArrayWrapper<const N: usize> {
data: [u8; N],
}
fn process<const N: usize>(arr: [u8; N]) {
println!("Processing {} bytes", N);
}
Const generics let you pass numbers to your code structure that the compiler uses to build the final program, rather than checking them while the program runs. Think of it like ordering a custom-sized box at the factory; the box is built exactly to that size before it ever leaves the warehouse, making it faster and safer than resizing a generic box later.