[Agda] tuple patterns
Serge D. Mechveliani
mechvel at botik.ru
Sat Sep 22 11:39:15 CEST 2012
On Fri, Sep 21, 2012 at 09:42:29PM +0200, Nils Anders Danielsson wrote:
> On 2012-09-21 21:18, Serge D. Mechveliani wrote:
>> I. Is it reliable to write -> instead of \arrow ?
>
> If you've encountered a problem, please report a bug.
I meant:
I write -> instead of the math symbol; the compiler takes it,
but I wonder whether the Language allows this.
>> f : Nat -> Nat
>> f m with (3 <=? m , m <=? 6) -- : Dec (3 <= m) x Dec (m <= 6)
>> ... | (no _ , _ ) = 1
[..]
> In this case I suggest that you use the following notation instead,
> though:
>
> f : Nat -> Nat
> f m with 3 <=? m | m <=? 6
> ... | no _ | _ = 1
> [..]
Good. Thank you.
I write now
...
orderedList? (x :: y :: xs) with x <=? y | orderedList? (y :: xs)
... | no p | _ = no (compose p oList-1<=2)
... | _ | no p = no (compose p tailOrdered)
... | yes x<=y | yes ord-y:xs = yes $ prep2 x y xs x<=y ord-y:xs
And if the first pattern ``... | no p'' shoots at run time, I need
``orderedList? (y :: xs)'' not to evaluate here -- by laziness
(which laziness is used here for optimization). Is this reliable in
Agda ?
Thanks,
-------
Sergei
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