#line 1166 "/home/travis/build/felix-lang/felix/src/packages/arrays.fdoc"
  Bounded sparse array.
  Basically a sarray with a given bound.
  The bound is ignored for get and set methods.
  The bound is used for membership tests and iteration.
  include "std/datatype/sarray";
  open class Bsarray
    private struct bsarray_ctl[T] { a: sarray[T]; n:size; };
    type bsarray[T] = new &bsarray_ctl[T];
    Contruct with default value and bound.
    ctor[T,I in ints] bsarray[T] (dflt:T, bound:I) =>
      _make_bsarray[T]$ new bsarray_ctl[T] (sarray[T](dflt), bound.size)
    Contrue as array value.
    instance[T] ArrayValue[bsarray[T],T] {
      fun len(b:bsarray[T])=> (_repr_ b)*.n;
      fun unsafe_get(b:bsarray[T], i:size)=> get ((_repr_ b)*.a, i);
    Contrue as array object.
    instance[T] ArrayObject[bsarray[T],T] {
      proc unsafe_set(b:bsarray[T], i:size, v:T)=> set ((_repr_ b)*.a, i, v);
    Contrue as set: membership test.
    instance[T with Eq[T]] Set[bsarray[T],T] {
     // FIX ME: inefficient!
     fun \(\in\) (x:T, a:bsarray[T]) : bool = {
       if len a > 0uz
         for var i in 0uz upto len a - 1uz
           if a.i == x return true
       return false;
    instance[T with Show[T]] Str[Bsarray::bsarray[T]] {
      Convert to string.
      fun str (xs:bsarray[T]) = {
        var o = 'bsarray(';
        if len xs > 0uz do
          o += repr xs.0;
          for var i in 1uz upto len xs - 1uz do
            o += ', ' + repr xs.i;
        return o + ')';
  open[T] Show[Bsarray::bsarray[T]];
  open[T] Set[Bsarray::bsarray[T],T];
  open[T] ArrayValue[bsarray[T], T];
  open[T] ArrayObject[bsarray[T], T];
  open[T] ContiguousArrayObject[bsarray[T], T];