Branches: main
Fix bitmap predicates which did not work correctly with empty bitmaps.
Note that `bitmap.to_string' now returns "<0:>" for an empty bitmap instead
of "<0:00>".
library/bitmap.m:
Add `in_range_rexcl' to check an index is in the range [0, num_bits).
Fix bounds checks on empty bitmaps in `^ bits' and `copy_bytes'.
Simplify other bounds checks using `in_range_rexcl'.
Make `byte_index_for_bit' return -1 if its argument is negative,
instead of 0. `byte_index_for_bit(NumBits - 1)' is used to get the
last byte index, so now loops over empty bitmaps will stop immediately
as the initial index must be greater than -1.
Make some code neater.
tests/hard_coded/Mmakefile:
tests/hard_coded/bitmap_empty.exp:
tests/hard_coded/bitmap_empty.m:
Add a test case.
NEWS:
Mention changed behaviour of `bitmap.to_string'.
