[m-users.] Cartesian product of two sets of things.

[Sean Charles (emacstheviking)]

I know I did but that's me being me!
So far, Mercury has only impressed me with how pleasant writing a game can be.

I was reading the source code for the array module, trying to get some ideas on how I might implement a module that could allocate a fixed block of memory for N slots of a du type and then provide an interface to it so I can walk that block using just pointer arithmetic, and then, given a pointer, which would be declared as a mercury type too, provide some update methods to either write a single field or, given a fully populated du instance, copy all the fields in one go.

From what I've seen I think it wouldn't be that hard, it would bevery interesting for me to do and I'd learn a lot.

In the future I'd like to try using Mercury as the means to write code for the Godot game engine system too:
https://godotengine.org/article/introducing-gd-extensions/

As usual, day jobs and other stuff are time bandits.


> On 9 Oct 2023, at 11:45, Volker Wysk <post at volker-wysk.de> wrote:
> 
> You're welcome. 
> 
> I'm not sure how efficient this is, though. You wanted to have maximum
> efficiency before, for your game...
> 
> Cheers,
> Volker
> 
> Am Montag, dem 09.10.2023 um 11:34 +0100 schrieb Sean Charles
> (emacstheviking):
>> Nice, I'm stealing that! I will adapt it, and of course your name will be carved in pixels in the ether in a comment in a game that nobody will ever see!
>> 
>> Thanks Volker.
>> 
>> :)
>> 
>> 
>>> On 9 Oct 2023, at 10:08, Volker Wysk <post at volker-wysk.de> wrote:
>>> 
>>> Am Montag, dem 09.10.2023 um 11:04 +0200 schrieb Volker Wysk:
>>>> :- pred cart_prod(set(T)::in, set(U)::in, set(pair(T, U))::out) is det.
>>> 
>>> Oops, that should be:
>>> 
>>> :- pred cart_prod(set(T)::in, set(U)::in, list(pair(T, U))::out) is det.
>>> 
>>> Volker
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>>> users mailing list
>>> users at lists.mercurylang.org
>>> https://lists.mercurylang.org/listinfo/users
>> 
> 
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