wakey wakey!

20 Oct 2000

      Ok folks, I decided it's time we woke this list up again.

*kick*

Right.  I've got so many things on my ToDo list that come under the heading
of "can't be done until the FFI library is finalized", it's getting silly.

For the time being, I've been using Marcin's library, which I've found to be
suitable for what I'm doing, but I know there are several other libraries
out there to consider.  So that we don't get overwhelmed by choices and
design decisions, I suggest we take this one step at a time.

STEP 1:   Addr or (Ptr a) ?

I'm convinced that Ptr a is the way to go.  After brief conversations with
Manuel at ICFP, I think he's agreed, and presumably Marcin is too (since his
library is based on Ptr a).  What do the rest of you think?

	Definition of "Ptr a":

	A pointer to an object or array of objects which can be
      marshalled to, and from, a haskell object of type "a".
      Usually "a" will be an instance of "class Storable", which
	provides the marshalling code.

Using "Ptr a" eliminates the need for those annoying dummy arguments to
malloc and friends, and provides some useful type safety.  It might also in
the future allow us to typecheck our FFI calls with respect to the foreign
interface, but there are still issues to resolve before this can happen.

I've enclosed my modified version of GHC's Storable module, and a new module
Ptr containing the definitions of Ptr and FunPtr (ripped from Marcin's
library mostly).  Comments are most welcome.

Cheers,
	Simon

begin 600 Ptr.lhs
M+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM
M+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2T*+2T@)$ED)`HM+2`*
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M("`M+2!$871A('!O:6YT97)S+@H@("`@"B`@("!0='(H+BXI+"`@("`@("TM
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`
end

begin 600 Storable.lhs
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end

wakey wakey!

Simon Marlow