Macro solana_reed_solomon_erasure::convert_2D_slices

macro_rules! convert_2D_slices {
    (
        $slice:expr =>into_vec $dst_type:ty
    ) => { ... };
    (
        $slice:expr =>to_vec $dst_type:ty
    ) => { ... };
    (
        $slice:expr =>to_mut_vec $dst_type:ty
    ) => { ... };
    (
        $slice:expr =>into $dst_type:ty, $with_capacity:path
    ) => { ... };
    (
        $slice:expr =>to $dst_type:ty, $with_capacity:path
    ) => { ... };
    (
        $slice:expr =>to_mut $dst_type:ty, $with_capacity:path
    ) => { ... };
}

Makes it easier to work with 2D slices, arrays, etc.

Examples

Byte arrays on stack to Vec<&[u8]>

let array: [[u8; 3]; 2] = [[1, 2, 3],
                            [4, 5, 6]];

let refs: Vec<&[u8]> =
    convert_2D_slices!(array =>to_vec &[u8]);

Byte arrays on stack to Vec<&mut [u8]> (borrow mutably)

let mut array: [[u8; 3]; 2] = [[1, 2, 3],
                               [4, 5, 6]];

let refs: Vec<&mut [u8]> =
    convert_2D_slices!(array =>to_mut_vec &mut [u8]);

Byte arrays on stack to SmallVec<[&mut [u8]; 32]> (borrow mutably)

let mut array: [[u8; 3]; 2] = [[1, 2, 3],
                               [4, 5, 6]];

let refs: SmallVec<[&mut [u8]; 32]> =
    convert_2D_slices!(array =>to_mut SmallVec<[&mut [u8]; 32]>,
                       SmallVec::with_capacity);

Shard array to SmallVec<[&mut [u8]; 32]> (borrow mutably)

let mut shards = shards!([1, 2, 3],
                         [4, 5, 6]);

let refs: SmallVec<[&mut [u8]; 32]> =
    convert_2D_slices!(shards =>to_mut SmallVec<[&mut [u8]; 32]>,
                       SmallVec::with_capacity);

Shard array to Vec<&mut [u8]> (borrow mutably) into SmallVec<[&mut [u8]; 32]> (move)

let mut shards = shards!([1, 2, 3],
                         [4, 5, 6]);

let refs1 = convert_2D_slices!(shards =>to_mut_vec &mut [u8]);

let refs2: SmallVec<[&mut [u8]; 32]> =
    convert_2D_slices!(refs1 =>into SmallVec<[&mut [u8]; 32]>,
                       SmallVec::with_capacity);