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* test/012/oop-seq.tl: Add tests that verify that an OOP iter
without a copy method cannot be copied with copy-iter,
and that one which has the method can be copied, in
accordance with the requirements.
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Structure objects can be used to implement lazy structures
such as sequences. It is undesirable to take the length of
a lazy sequence because it forces all of its elements to
exist. Moreover, if the sequence is infinite, it is
impossible. There are situations in which it is only necessary
to know whether the length is less than a certain bound,
and for that we have the length-< function. That works on
infinite sequence such as lazy lists, requiring them to be
forced only so far as to determine the truth value of the
test. We need objects that implement lazy sequences to work
with this function.
* struct.h (enum special_slot): New member length_lt_m.
* lib.h (length_lt_s): Symbol variable declared.
* struct.c (special_sym): New entry in this table, associating
the length_lt_m enum with the length_lt_s symbol variable.
* lib.c (length_lt_s): Symbol variable defined.
(length_lt): Handle COBJ objects that are structures.
we test whether they have a length-< method, or else length
method. If they don't have either, we throw. We don't
fall back on the default case for objects that don't have
a length-< method, because the diagnostic won't be good
if they don't have a length method either; the programmer
will be informed that the length function couldn't find
a length method, without mentioning that it was actually
length-< that is being used.
* eval.c (eval_init): Register length-< using the length_lt_s
symbol variable rather than using intern.
* txr.1: Documented.
* tests/012/oop-seq.tl: New tests.
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* struct.c (invalidate_special_slots): New static function.
(invalidate_special_slot_nonexistence): Move static function
up in file, to be next to invalidate_special_slots.
(make_struct_type, static_slot_ens_rec): Call the new
invalidate_special_slots function in addition to calling
static_slot_home_fixup whenever the stslots array is resized.
The spslot array contains pointers to the elements of stslots,
which become invalid when that is resized.
* tests/012/oop-seq.tl: Repro test case added.
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* lib.c (seq_iterable): Return t if argument is a structure
supporting the iter-begin method.
(seq_iter_get_oop, seq_iter_peek_oop, seq_iter_get_fast_oop,
seq_iter_peek_fast_oop): New static functions.
(seq_iter_init_with_info): Handle COBJ case. If the COBJ is a
structure which suports the iter-begin method, then retrieve
the iterator object by calling it, and then prepare the
iterator structure for either the fast or the canonical
protocol based on whether the iterator supports iter-more.
(seq_iter_mark): Mark the iter member if the iterator is a
struct object.
(iter_begin): Rearrange tests here to check object type first
before sequence kind. If the object is a structure supporting
the iter-begin method, then call it and return its value.
(iter_more, iter_step): Check for struct object with
corresponding special methods and return.
(iter_reset): Similar change like in iter_begin. We check for
the iter-reset special method and try to use it, otherwise
fall back on the regular iter_begin logic.
* lib.h (struct seq_iter): New member next of the ul union
for caching the result of a peek operation.
* struct.c (iter_begin_s, iter_more_s, iter_item_s,
iter_step_s, iter_reset_s): New symbol variables;
(special_sym): Pointers to new symbol variables added to
array.
(struct_init): New symbol variables initialized.
(get_special_required_slot): New function.
* struct.h (iter_begin_s, iter_more_s, iter_item_s,
iter_step_s, iter_reset_s): Declared.
(enum special_slot): New enum members iter_begin_m,
iter_more_m, iter_item_m, iter_step_m, iter_reset_m.
(get_special_required_slot): Declared.
* txr.1: Documented.
* tests/012/oop-seq.expected: New file.
* tests/012/oop-seq.tl: New file.
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