proc_unroll is a proc macro to unroll loops inside a function. It supports loops of the following forms:

• for pat in int..int
• for pat in &[elem, elem]

Examples

Simple example using a range:

#[proc_unroll::unroll]
fn unrolled() -> Vec<u32> {
    let mut vec = Vec::new();
    for x in 10..20 {
        vec.push(x);
    }
    vec
}
assert_eq!(unrolled(), (10..20).collect::<Vec<_>>());

You can also use it in a const fn:

#[proc_unroll::unroll]
const fn inner() -> i64 {
    let mut total = 0;
    for x in &[5, 15, 30] {
        total += *x;
    }
    total
}

assert_eq!(inner(), 50);