Re: [boost] [Hana] Announcing Hana's formal review next week (June 10th)

Subject: Re: [boost] [Hana] Announcing Hana's formal review next week (June 10th)
From: Louis Dionne (ldionne.2_at_[hidden])
Date: 2015-06-16 11:09:51

Vicente J. Botet Escriba <vicente.botet <at> wanadoo.fr> writes:

>
> Le 15/06/15 22:39, Louis Dionne a écrit :
> > Vicente J. Botet Escriba <vicente.botet <at> wanadoo.fr> writes:
> >
> > [...]
> >
> >> * the instantiation either directly or when the type is an instance of a
> >> type class (using the second parameter).
> > If you are referring to automatically-defined models, this is still
> > possible. For example, the model of Monoid is automatically provided
> > for any Constant containing something that's a Monoid too:
> >
> >      template <typename C>
> >      struct plus_impl<C, C, when<
> >          models<Constant, C>() &&
> >          models<Monoid, typename C::value_type>()
> >      >> {
> >          // implementation of plus()
> >      };
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ˆH˜XÝ][H[˜Ý[ÛœÈ\™H[ˆHØ[YH˜[Y\ÜXÙKˆ\È[\Bˆˆ]ÙH™YYÈš[™HY™™\™[˜[YH›ÜˆXXڝ[˜Ý[Û‹ˆXZÚ[™È\ÙHÙ‚ˆˆ˜[Y\ÜXÙ\ț܈XXÚÛÛ˜Ù\YHœ™YYÛHYÜ™YK‚ˆˆÛ™HÙˆ^H™X\œÈ\È]\ÈÛÝ[XZÙHHXœ˜\žH]XÚ[Ü™HÛÛ\XØ]Yˆˆ\ÜXÚX[H›Üˆ™]È\Ù\œËˆÚ]ÛÝ[\[ˆYˆ[ÝHYÈ™Yš^XXڏˆˆ[ÛÜš]HÚ]H˜[YHÙˆHÛÛ˜Ù\]Yš[™\È]ÈHÛ›ÝÈHÛÝ[ˆˆÛÛY][Y\È\ÚÈ^\Ù[ˆš^KÚ]ÛÛ˜Ù\Yš[™\È\ÏÈ‹ÛÈHØ[ˆÛ›Bˆˆ[XYÚ[™HHÛÜœÙH›ÜˆÝ\ˆ\Ù\œË‚ˆHÙYH\ÈY™™\™[Kˆ]Ú[›Ü˜ÙHH\Ù\ˆÈ\ÚÈ[\Ù[‹Ú]ˆ^Xݝ[˜Ý[ÛˆH\È\Ú[™Ë‚‚’[\™\Ý[™ËˆH[šÈ[ÜÝ\Ù\œÈÛ‰ÝØ[È]™HÈÈ\Èinking, lol.
My goal is to make metaprogramming easier for average programmers. In the
mid/long term, I want Hana to be usable without even knowing about the
Functor/Applicative/Monad/MonadPlus concepts & al. These concepts will
still be available for more hardcore developers or FP people, and they are
incredibly important because they are the basis on which the library is built.
However, the average Joe who just wants a damn for_each on a tuple should not
be required to understand Monads or even the Foldable concept (personally,
it took a good while until I was finally comfortable with folds).

> > My preference so far has been to deal with this missing degree of liberty
> > by selecting names that do not clash. It is sometimes a bit annoying, but
> > I¡¥¹¬Ñ¡”É•Íձѥ¹œÍ¥µÁ±¥¥Ñ䁥́ݽÉÑ ¥Ð¸(ø
ÕÉÉ•¹Ñ±äå½Ô…É”™É•”Ñ¼ÕÍ”…¹ä¹…µ•Ì¥¸‰½½ÍÐèé¡…¹„°‰ÕЁ¡½ÜÝ½Õ±(øå½Ô¹…µ”Ñ¡•´¥˜å½ÔÝ•É”Ýɥѥ¹œ„ÁɽÁ½Í…°™½ÈÑ¡”¬¬ÍÑ…¹‘…ɐü(ø]”Ý¥±°¡…Ù”I…¹”µX́½¹”‘…䁅¹½Ñ¡•É́ѡ…Ёµ…­”ÕÍ”½˜Í¥µ¥±…ȁ¹…µ•Ì¸(øÍͽ¥…Ñ¥¹œÑ¡”¹…µ•ÌÑ¼Ñ¡”½¹•ÁÑ́…±±½ÜÑ¼•ÐÉ¥½˜…±°Ñ¡•Í”(øÁ½ÍÍ¥‰±”±…Í¡•Ì¸()$Ý½Õ±ÑÉäÑ¼Á¥äµ‰…¬Ñ¡”Í…µ”¹…µ•Ì…́ѡ”I…¹”µǾ±¥‰É…É䁥¸µä)ÁɽÁ½Í…°°Í¼Ñ¡…Ёå½Ô…¸ÕÍ”…±½É¥Ñ¡µÌ‰½Ñ ½¸ÑÕÁ±•Ì…¹Éչѥµ”É…¹•Ì¸)ÑÕ…±±ä°$Ñ¡¥¹¬Ñ¡…Н́ѡ”™ÕÑÕÉ”¸()	ÕЁ‘•Í¥¹¥¹œ™½ÈÑ¡”ÍÑ…¹‘…ɐ…¹™½È	½½ÍЁ…É”ÑݼÙ•É䁑¥™™•É•¹ÐÑ¡¥¹Ì¸)$±°ÑÉäÑ¼•ÐÑ¡”™¥ÉÍЁ½¹”É¥¡Ð°…¹Ñ¡•¸Í•”¥˜$Ý…¹ÐÑ¼¼™½ÈÑ¡”)Í•½¹Ñ½¼¸(((ø€øøl¸¸¹t(ø€øø(ø€øø€¨]¡ä…¹Ý¡•¸™É•”™Õ¹Ñ¥½¹Ì½Èµ•µ‰•È™Õ¹Ñç2&RW6VBà£ââ’vÒæ÷B7W&Rv†WF†W"—B—2†æw2¦ö"FòW‡Æ–âv‡’g&VRgVæ7F–öç2&P£ââ&WGFW"F†âÖVÖ&W"gVæ7F–öç2f÷"vVæW&–2&öw&ÖÖ–ærâ’FöâwB¶æ÷rÂ'W@£ââ’fVVÂÆ–¶Rç–öæR&VF–ær†æw2GWF÷&–Âv÷VÆB¶æ÷rF†Rç7vW"à£â—B6VV×2F†B–÷RW6Rg&VRgVæ7F–öç2WfW'—v†W&RW†6WBv†Vâ–÷R6âæ÷Bà£âÒ’w&öæsð ¤vÆö&ÂgVæ7F–öâö&¦V7G2v÷VÆB&RÖ÷&R&V6—6RÂ'WB–V‚’F†–æ²F†Bw2—Bà¤öfbF†RF÷öb×’†VBÂ’vB6’F†RöæÇ’ÖVÖ&W"gVæ7F–öç2&P ¢ÒçF–ÖW2f÷"–çFVw&Ä6öç7FçBÂ&V6W6RF†BÆöö·2æ–6P¢Ò÷W&F÷%µÒf÷"6WVVæ6W2Â&V6W6R—B†2Fò&R–×ÆVÖVçFVB2ÖVÖ&W  £âà£âãâF†R&VfW&Væ6RFö7VÖVçFF–öâ—2Æ—GFÆR&—B6öægW6–ærf÷"6öÖRöæRW6V@£âãâFòF†R2²²7FæF&Bv’à£âãâ¢F†RFW&×26öæ6WBõ7WW&6Æ72ôÖWF†öG2Âââà£ââÈ\Ú[™ÈÛÛ˜Ù\È”™Yš[™YÛÛ˜Ù\‹Ñ[˜Ý[ۜ˂ˆ[šÜË‚ˆ‚ˆˆ
ˆH[Ü™H›Ü›X[Yš[š][ÛˆÙˆHX\[™ÜÈœ›ÛHÛۘܙ]H\HˆˆÛÛ˜Ù\È[™HÝ\\ˆÛ\ÜÙ\ˆ‚ˆˆX^X™H\È\È[›ÝYڛ܈›ÛÜݝ]HÛÝ[ZÙHÈÙYHH[Ü™HÊʏˆˆÝ[™\™ZÙHØÝ[Y[][Û‹‚ˆˆIÛH›ÝÝ\™HH[™\œÝ[™Ú][ÝHYX[ˆžHH[Ü™H›Ü›X[Yš[š][ÛˆÙˆBˆˆX\[™Èœ›ÛHÛۘܙ]H\HÈÛÛ˜Ù\ˈÈ[ÝHYX[ˆ]H™\]Z\™[Y[ˆˆÙˆHÛÛ˜Ù\ÚÝ[™HYš[™Y[Ü™H›Ü›X[OˆHÛÝ[ZÙHH\ØÜš\[Ûˆ]Yš[™\ÈÚ]^™\ÜÚ[ÛœÈ\™H˜[YÚ]™[‚ˆÛÛYHÛۜݘZ[ÈÛˆÝ\ˆ^™\ÜÚ[ۜ˂‚“ÚËÛÈÞ[XÝXÈ™\]Z\™[Y[È[œÝXYÙˆ\ÝÙ[X[XÈ™\]Z\™[Y[Ë‚•]ÙY[\ÈHYÚ][X]H[™\ÙY[[™ÈÈØÝ[Y[ˆÙYH\È\ÜÝYHÌWK‚‚‚ˆˆË‹‹—BˆˆHÚ[do it as soon as I install the good compiler version.
> > You can try it online at [7].
> >
> I will do. I would like to see how something like the metaparse library
> or
>
> (http://blog.mattbierner.com/stupid-template-tricks-pride-and-parser
> -combinators-part-one/)
> becomes while using Hana interface.

That would indeed be a very interesting experiment. However, that would take
a lot of time and I can't afford to do that right now. Perhaps later after
the review, when all those issues I'm accumulating are fixed :-).

Regards,
Louis

[1]: https://github.com/ldionne/hana/issues/127