New :postfini feature in defstruct.

The :postfini clause registers a finalizer that runs in the
ordinary order: after previously registered ones. This has
the effect of allowing a derived structure to run clean-up
actions after those of inherited structures. Either order
can be useful because the dependencies between base and
derived can go in either direction. It's a huge mistake in
C++ that it supports only derived-first destructor invocation
order.

* stdlib/struct.tl (defstruct): Recognize and translate
:postfini clause. It's exactly like :fini but omits the
t parameter in the finalize call, registering in the
natural order.

* tests/012/fini.tl (derived): Add :postfini handler.

* tests/012/fini.expected: Updated to reflect the messages
coming from the postfini handler, which are happening
in the correct order.

* txr.1: Documented.

0 files changed, 0 insertions, 0 deletions