Use const generics by adding a const parameter to types or functions to enable compile-time specialization for fixed sizes.
Use const generics by adding a const parameter with a type (usually usize) to your struct, enum, or function definition, then pass a compile-time constant as the argument. This allows the compiler to generate specialized code for different sizes or values at compile time.
struct Array<const N: usize> {
data: [i32; N],
}
fn main() {
let arr = Array { data: [0; 10] };
}
Const generics let you pass numbers directly into your type definitions so the compiler can optimize memory and performance for that specific size. Think of it like ordering a custom-sized box; instead of making one giant box that fits everything, you get the exact size you need, saving space and resources. You use this when you need fixed-size arrays or buffers where the size is known before the program runs.