On 10 November 2016 at 18:49, Carsten Haitzler <ras...@rasterman.com> wrote:
> On Wed, 9 Nov 2016 12:14:36 -0200 Gustavo Sverzut Barbieri <
> barbi...@gmail.com>
> said:
>
> > Hi all,
> >
> > I'm using Eo extensively and its Eolian works well, great work.
> >
> > But one thing that I struggle in my examples is to translate
> > enumerations to string and back. I have to repeat that similar code in
> > my examples and I wonder if Eolian should generate them for me... I
> > guess so, what's your take on that?
> >
> > Also, please add another marker for "enum" that informs it's a
> > bitwise, we just document that, but would be nice to have a formal way
> > to inform. Maybe also something in the pass/return of values, to
> > specify if it takes a single or multiple. Like this:
> >
> > enum @bitwise Mode {
> > read, [[ being bitwise, no values means (1 << 0)]]
> > write, [[ 1<<1 is automatic]]
> > }
> >
> > generates:
> > const char *mode_str_to(enum Mode); // for single entry
> > enum Mode mode_str_from(const char *Mode); // for single entry
> >
> > const char *mode_bitmask_str_to(unsigned Mode); // for many entry
>
> this one above is going to suck for bitwise. you'd have to generate a
> biffer -
> you couldn't sanely generate "all combinations" and compile theme except
> for
> very trivial examples. then the q is - what buffer is this? a single one
> isnt
> very usable. :(
>
> jpeg brought this up today. he might expand on this. :)
>
Yes. Based on raster's eina_freeq, we could create a temporary string API.
An API that, unlike eina_tmpstr, does not require any manual free. By
definition, a string would be valid only for the current scope. (with a
small gotcha if ecore_main_loop_iterate is called).
At the moment, eina_freeq is used for "safety" but I think some kind of
garbage collected objects API could be useful, especially for strings. That
way we could simply return const char* in many places without having to
worry about static allocation, or requiring the user to free each string.
>
> > unsigned mode_bitmask_str_from (const char *Mode); // for many entry
> >
> >
> > the bitmask_str_to() as 'const char*' may be painful since we'd have
> > to generate all combinations as static const char, but it's easier to
> > use. Allocating and returning a value could be an alternative.
> and this is pretty "UGH" unless we have a sane way of dealing with returns
> -
> freeing is posible but makes usage a pain. :(
>
> printf("have: %s\n", bitmask_str_from(x));
>
> :( cant do. need to store and free every time. :(
>
> > For methods we could use:
> >
> > class C () {
> > methods {
> > open {
> > params {
> > mode: bitmask<Mode>;
> > }
> > }
> > mode_get {
> > return: bitmask<Mode>;
> > }
> > }
> > }
> >
> > This would generate functions that hints about mode to use but will
> > take/return unsigned integers to avoid compilers saying the value
> > doesn't exist in enum.
> >
> >
> > --
> > Gustavo Sverzut Barbieri
> > --------------------------------------
> > Mobile: +55 (16) 99354-9890
> >
> > ------------------------------------------------------------
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>
>
> --
> ------------- Codito, ergo sum - "I code, therefore I am" --------------
> The Rasterman (Carsten Haitzler) ras...@rasterman.com
>
>
> ------------------------------------------------------------
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> Access to Intel Xeon Phi processor-based developer platforms.
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--
Jean-Philippe André
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