[m-dev.] for review: change library to use existential types

[David Glen JEFFERY]

On 18-Nov-1998, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> Hi,
> 
> I suppose dgj is the exisential types export -- could you
> please review this one for me, David?

I've never thought of myself as an export. Where am I being exported to? ;-)

> --------------------
> 
> Change the standard library to use existential types.
> 
> library/std_util.m:
> 	Add new existentially typed procedures univ_value/1 and has_type/2.
> 
> library/term.m:
> library/io.m:
> 	Use existential types rather than unsafe casts and other hacks.
> 

> +	% XXX what is the right TYPE_QUAL_OP to use here?
> +	io__write_string(" : "),

Good question. Is ":" the right thing to use for now?

> +io__write_c_pointer(_C_Pointer) -->
> +	% XXX what should we do here?
> +	io__write_string("'<<c_pointer>>'").

Another good question. Perhaps we should print out the pointer value. (?)

Anyhow, we can think about those two concerns later.  Commit away. 


dgj
-- 
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