Function decoder 

pub fn decoder<S: Into<String>>(
    g: &mut GateGraphBuilder,
    address: &[GateIndex],
    name: S,
) -> Vec<GateIndex>

Returns the output of a decoder. The output width will be 2^address.len().

Example

let input = WordInput::new(&mut g, 3, "input");
let out = decoder(&mut g, &input.bits(), "decoder");

let output = g.output(&out, "result");

let ig = &mut g.init();
ig.run_until_stable(2);

assert_eq!(output.u8(ig), 0b1);

input.set_to(ig, 2);
ig.run_until_stable(2);
assert_eq!(output.u8(ig), 0b100);