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use typenum::consts::{U1};
use std::ops::Add;
use super::ArrayLength;
pub trait AddLength<T, N: ArrayLength<T>>: ArrayLength<T> {
type Output: ArrayLength<T>;
}
impl<T, N1, N2> AddLength<T, N2> for N1
where N1: ArrayLength<T> + Add<N2>,
N2: ArrayLength<T>,
<N1 as Add<N2>>::Output: ArrayLength<T>
{
type Output = <N1 as Add<N2>>::Output;
}
pub type Inc<T, U> = <U as AddLength<T, U1>>::Output;
#[macro_export]
macro_rules! arr_impl {
($T:ty; $N:ty, [$($x:expr),*], []) => ({
use typenum::consts::U0;
use generic_array::GenericArray;
use generic_array::arr::Inc;
GenericArray::<$T, $N>::from_slice(&[$($x),*])
});
($T:ty; $N:ty, [], [$x1:expr]) => (
arr_impl!($T; Inc<$T, $N>, [$x1], [])
);
($T:ty; $N:ty, [], [$x1:expr, $($x:expr),+]) => (
arr_impl!($T; Inc<$T, $N>, [$x1], [$($x),*])
);
($T:ty; $N:ty, [$($y:expr),+], [$x1:expr]) => (
arr_impl!($T; Inc<$T, $N>, [$($y),*, $x1], [])
);
($T:ty; $N:ty, [$($y:expr),+], [$x1:expr, $($x:expr),+]) => (
arr_impl!($T; Inc<$T, $N>, [$($y),*, $x1], [$($x),*])
);
}
#[macro_export]
macro_rules! arr {
($T:ty; $($x:expr),*) => (
arr_impl!($T; U0, [], [$($x),*])
);
($($x:expr,)*) => (arr![$($x),*])
}