[macstl-dev] Opinions wanted: tied expressions (multi-valued expressions and manual loop fusion)

[Glen Low]

All:

On 28/11/2005, at 8:14 AM, Glen Low wrote:

> 6. How to incorporate multiple output syntax into the proposal.  
> E.g. a deinterleave function that deinterleaves 1 stream into 4  
> might logically produce a 4-tuple so that
>
> tie (a, b, c, d) = deinterleave (e);
>
> But then what should the syntax be for applying operations between  
> the deinterleaved streams i.e. what would be the succinct  
> expression of
>
> tie (a, b, c, d) = deinterelave (e);
> f = (a * b) + (c * d);
>
> I suppose if we allowed temp placeholders and tie flattening, then
>
> tie (a, b, c, d, f) = tie (deinterleave (e), (a * b) + (c *d));
>
> could be one such syntax.

Just as an alternative, we could use the Boost lambda-like syntax of:

f = ((_1 * _2) + (_3 * _4)) (deinterleave (e));

although I suspect it will be less flexible than using ties.

Cheers, Glen Low


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