nested enum like template generator

[JS]

On Tuesday, 16 July 2013 at 14:05:38 UTC, Ali Çehreli wrote:
> On 07/15/2013 10:51 PM, JS wrote:
>
> > On Tuesday, 16 July 2013 at 04:37:33 UTC, Ali Çehreli wrote:
> >> On 07/15/2013 08:43 PM, JS wrote:
> >>
> >> > http://dpaste.dzfl.pl/7c8b0ba9
> >> >
> >> > Why the heck can't we use integers in ctfe's? There seems
> to
> >> be no
> >> > simple way to create a counter and this is one of the most
> >> basic
> >> > programming constructs to use.. yet with ctfe's it's
> >> impossible.
> >> >
> >> > I'd like each variable in the nested structs to be
> >> incremented properly.
> >>
> >> I did not read the code but just from your description, the
> separate
> >> compilation model that D uses would preclude that. For
> example,
> >> compilation of a.d would not know anything about the counter
> that b.d
> >> has counted during its compilation.
> >>
> >> Ali
> >
> > Huh? what is a.d and b.d?
>
> Yeah, I should have read your code before writing that. My 
> comment is for the general case where a.d and b.d are two 
> separte modules that are compiler separately. I thought that 
> you wanted a counter to continue counting between modules.
>

That wold be nice but require external storage to an ctfe which 
is a limitation of ctfe's.

Ok, at least this post has helped me solve my problem. I guess 
the issue was the error message given.

The problem is I can't declare my "global" int variables directly 
inside the template. This does make it hard to use the same 
variable across multiple functions...

template A
{
     int c; // makes c near useless, can't use it like a normal 
it...
}

solution, one has to use nested functions:

template A
{
      string templateScope()
      {
          int c;  // c now acts like a normal global int value to 
all nested functions.

      }
}


I think I understand why this works and is done this way but the 
error message given obfuscates the reason. Unfortunately it 
requires a messy technique to get around by using nested 
functions. (The parent function holds the global state of the 
child functions)

It would be nice if we had some way to data globally(in module).

e.g., __ctfestore["name"] = value;

I understand this wouldn't probably work well outside the module 
since compilation order may be not be consistent. (but maybe 
__ctfeVolitileStore could be used for cross module storage)