concatenate

import mir.ndslice.fuse : fuse;
import mir.ndslice.topology : universal;
import mir.ndslice.dynamic : transposed;

auto m = fuse([[1, 2],[3, 4]]);
auto u = fuse([[5, 6]]);

assert(concatenate(m, u) == [[1, 2], [3, 4], [5, 6]]);
assert(concatenate(u, m) == [[5, 6], [1, 2], [3, 4]]);

auto uT = u.universal.transposed;
assert(concatenate!1(m, uT) == [[1, 2, 5], [3, 4, 6]]);

import mir.ndslice.fuse : fuse;
import mir.ndslice.topology : iota;

assert(concatenate!0([[0, 1]].fuse,
                     [[2, 3]].fuse,
                     [[4, 5]].fuse) == iota(3, 2));
assert(concatenate!1([[0, 1]].fuse,
                        [[2, 3]].fuse,
                        [[4, 5]].fuse) == [iota(6)]);

// axis=-1 is the same to axis=$-1
assert(concatenate!(-1)([[0, 1]].fuse,
                        [[2, 3]].fuse,
                        [[4, 5]].fuse) == [iota(6)]);
assert(concatenate!(-1)([[0, 1]].fuse, [[2]].fuse) == [[0, 1, 2]]);