[erlang-questions] ?DATE and ?TIME MACROs
Tue Oct 7 16:19:04 CEST 2008
Mats Cronqvist wrote:
> afaik, no. it's just a regular exported function that would look
> something like this in Erlang.
> module_info() -> <list of tagged tuples>.
> module_info(Tag) ->
> try proplists:get_value(Tag,module_info())
> catch _:_ -> exit(badarg)
> where <list of tagged tuples> is a constant term.
> this is just speculation on my part though.
That used to be true, but these days they are simply
wrappers around a couple of built-in (undocumented?)
functions, like this:
module_info() -> erlang:get_module_info(?MODULE).
module_info(Tag) -> erlang:get_module_info(?MODULE, Tag).
(Since the metadata is already loaded from a chunk in the
beam file, there is no need to duplicate it in the code.)
But the compiler inserts the functions, yes.
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