RCArray

auto a = RCArray!double(10);
foreach(i, ref e; a)
    e = i;
auto b = a;
assert(b[$ - 1] == 9);
foreach(i, ref e; b)
    assert(e == i);
b[4] = 100;
assert(a[4] == 100);

import mir.ndslice.slice;

auto s = a.asSlice; // as RC random access range (ndslice)
static assert(is(typeof(s) == Slice!(RCI!double)));
static assert(is(typeof(s) == mir_slice!(mir_rci!double)));

auto r = a[]; // scope array
static assert(is(typeof(r) == double[]));

auto fs = r.sliced; // scope fast random access range (ndslice)
static assert(is(typeof(fs) == Slice!(double*)));