datastructuretraits

data structure collection traits

```rust

[macro_use]

extern crate datastructuretraits;

use datastructuretraits::*;

fn useseq<'a, S>(s: &'a mut S) -> f32 where S: SeqMut<'a, f32>, &'a S: IntoIterator, &'a mut S: IntoIterator, { if s.len() >= 5 { s.getmut(4).map(|v| { *v = 0.0; }); } else { s.insert(0, 1.0); }

let mut avg = 0.0;
let len = s.len();

for v in s.into_iter() {
    avg += *v;
}

avg / (len as f32)

}

fn main() { let mut v: Vec = collection![0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0]; println!("{:?}", use_seq(&mut v)); } ```