[erlang-questions] OTP-9649 and further changes

Björn Gustavsson <>
Tue Jan 24 08:22:20 CET 2012


2012/1/24 Yurii Rashkovskii <>:
> Björn,
>
> Is there any way tuple module calls can be separated from parametrized
> modules and subsequently documented and become part of standard
> Erlang?
>

Perhaps.

The problem with the current implementation of "tuple modules"
is that the M in apply(M, F, A) and M:F(...) has a strange type, i.e. M can
be either an atom or a tuple. Unless we implement parameterized modules,
we want M to be only an atom. (There is a run-time cost in the
implementation of apply/3 to allow parameterized modules/"tuple modules",
and parameterized modules prevented an optimization I wanted to do in the
compiler for R15B.)

We might consider an alternative implementation of "tuple modules"
that does not use apply(M, F, A) or M:F(...), using either new BIFs or new
syntax. (Example: tuple_module_apply(M, F, A) could behave as apply/3
currently behaves, or alternatively only allow M to be a tuple. This is not
a serious suggestion, just an example to make it clear what I mean.)

I suggest that you write an EEP.

-- 
Björn Gustavsson, Erlang/OTP, Ericsson AB



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