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use std::marker::PhantomData;
use Construct;
use Data;
use Count;
use ToIndex;
use ToPos;
pub struct DirectedContext<T>(PhantomData<T>);
impl<T> Construct for DirectedContext<T> {
fn new() -> DirectedContext<T> { DirectedContext(PhantomData) }
}
impl<'a> Count<&'a [usize]> for DirectedContext<Data> {
fn count(&self, dim: &'a [usize]) -> usize {
use NeqPair;
let pair: NeqPair<Data> = Construct::new();
let mut sum = pair.count(dim[0]);
let mut prod = dim[0];
for &d in &dim[1..] {
sum = d * sum + pair.count(d) * prod;
prod *= d;
}
sum
}
}
impl<'a> ToIndex<&'a [usize], (&'a [usize], usize, usize)> for DirectedContext<Data> {
fn to_index(&self, dim: &'a [usize], (p, ind, b): (&'a [usize], usize, usize)) -> usize {
use Context;
let context: Context<Data> = Construct::new();
let index = context.to_index(dim, (p, ind, b));
if p[ind] > b {
2 * index + 1
} else {
2 * index
}
}
}
impl<'a> ToPos<&'a [usize], (Vec<usize>, usize, usize)> for DirectedContext<Data> {
fn to_pos(
&self,
dim: &'a [usize],
index: usize,
pos: &mut (Vec<usize>, usize, usize)
) {
use Context;
let context: Context<Data> = Construct::new();
if index % 2 == 0 {
context.to_pos(dim, index / 2, pos);
} else {
context.to_pos(dim, (index - 1) / 2, pos);
let tmp = pos.0[pos.1];
pos.0[pos.1] = pos.2;
pos.2 = tmp;
}
}
}
#[cfg(test)]
mod tests {
use super::super::*;
#[test]
fn data() {
let x: DirectedContext<Data> = Construct::new();
let dim = &[2, 2, 2];
assert_eq!(x.count(dim), 24);
assert_eq!(x.to_index(dim, (&[0, 0, 0], 0, 1)), 0);
assert_eq!(x.to_index(dim, (&[1, 0, 0], 0, 0)), 1);
for i in 0..x.count(dim) {
let mut pos = (vec![], 0, 0);
x.to_pos(dim, i, &mut pos);
println!("{:?}", pos);
assert_eq!(x.to_index(dim, (&pos.0, pos.1, pos.2)), i);
}
}
}