http://d.puremagic.com/issues/show_bug.cgi?id=8143



--- Comment #10 from bearophile_hugs@eml.cc 2012-10-24 10:36:19 PDT ---
One more test case:

enum En[][] m1 = to!(En[][])([[10, 30], [30, 10]]);

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--- Comment #11 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2012-10-24 10:58:10 PDT ---
http://dpaste.dzfl.pl/f4e35e84

More tests welcome!

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--- Comment #12 from bearophile_hugs@eml.cc 2012-10-24 17:20:39 PDT ---
(In reply to comment #11)
> http://dpaste.dzfl.pl/f4e35e84

Please attach this in Bugzilla :-)


> More tests welcome!

Is this supported?

enum En[][] m1 = to!(En[][])([[10, 30], [30, 10]]);

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--- Comment #13 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2012-10-24 17:32:54 PDT ---
Created an attachment (id=1153)
d

(In reply to comment #12)
> Is this supported?
> enum En[][] m1 = to!(En[][])([[10, 30], [30, 10]]);

Yes.

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--- Comment #14 from bearophile_hugs@eml.cc 2012-10-24 17:43:17 PDT ---
(In reply to comment #13)

> > Is this supported?
> > enum En[][] m1 = to!(En[][])([[10, 30], [30, 10]]);
> 
> Yes.

Then I suggest to add it to your tests, because it's not present.

Your tests contain code like:

En[][] m1 = to!(En[][])([[10, 30], [30, 10]]);

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #1153|0                           |1
        is obsolete|                            |


--- Comment #15 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2012-10-24 17:56:41 PDT ---
Created an attachment (id=1154)
code

(In reply to comment #14)
> (In reply to comment #13)
> 
> > > Is this supported?
> > > enum En[][] m1 = to!(En[][])([[10, 30], [30, 10]]);
> > 
> > Yes.
> 
> Then I suggest to add it to your tests, because it's not present.
> 
> Your tests contain code like:
> 
> En[][] m1 = to!(En[][])([[10, 30], [30, 10]]);

Ah it took me a while to realize you were looking for CTFE ability.

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--- Comment #16 from bearophile_hugs@eml.cc 2012-10-24 18:38:41 PDT ---
(In reply to comment #15)

> Ah it took me a while to realize you were looking for CTFE ability.

Sorry for not being more clear.

Another significant test case, this is useful in many simulations and games, to write safe tables and start conditions:


enum Code : char { A='A', B='B', C='C' }

void test()
{
...
    const code = to!(Code[][])(["ABCCBA", "BBAA"]);
    with (Code)
        assert(code == [[A, B, C, C, B, A], [B, B, A, A]]);
}


The main problem with this is that you receive conversion errors only at run-time, and in D the problem with array compile-time constants is that the compiler re-creates them every time where you use them. So they are not so useful.

------------------

Unfortunately this is not yet allowed because to!() is not pure:

immutable code = to!(Code[][])(["ABCCBA", "BBAA"]);

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #1154|0                           |1
        is obsolete|                            |


--- Comment #17 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2012-10-24 18:49:26 PDT ---
Created an attachment (id=1155)
new

Without purity it works ok though.

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--- Comment #18 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2012-10-25 10:05:39 PDT ---
(In reply to comment #17)
> Created an attachment (id=1155) [details]
> new
> 
> Without purity it works ok though.

Not much (any) response in D NG. I could try and make a pull and see what folks
have to say.

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--- Comment #19 from bearophile_hugs@eml.cc 2012-10-25 10:25:29 PDT ---
(In reply to comment #18)

> Not much (any) response in D NG. I could try and make a pull and see what folks
> have to say.

OK.

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