http://d.puremagic.com/issues/show_bug.cgi?id=4536

           Summary: Typetuples (T...) should have an .init member
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: philippe.sigaud@gmail.com


--- Comment #0 from Philippe Sigaud <philippe.sigaud@gmail.com> 2010-07-30 12:05:32 CEST ---
Typetuples (T...) should have an .init member. Them not having it is a bother
for generic code.

Say I have a template that takes an alias and a T..., and I want to verify that the alias is a function accepting T...:

template Test(alias fun ,T...)
if (is(typeof(fun(T.init)))
{...}

This does not work, which I find frustrating.

I have to use this workaround:

template Init(T...)
{
    alias (Tuple!T.init).expand Init;
}

That is, using std.typecons.Tuple as an initiator.

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--- Comment #1 from Philippe Sigaud <philippe.sigaud@gmail.com> 2010-08-19 22:35:10 CEST ---
(In reply to comment #0)

> template Init(T...)
> {
>     alias (Tuple!T.init).expand Init;
> }

Hmm, my mistake, the previous version doesn't work. I'm pretty sure it used to, since I was using it in my code.

Anyway, here is a far more simple version, no dependency:

template Init(T...)
{
    T Init;
}

a initialized T is correctly created. I still think .init should work like this for typetuples.

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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |yebblies@gmail.com


--- Comment #2 from yebblies <yebblies@gmail.com> 2011-06-15 08:10:41 PDT ---
What should .init do for a TypeTuple like this?
TypeTuple!(3, int).init = ?

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bearophile_hugs@eml.cc changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bearophile_hugs@eml.cc


--- Comment #3 from bearophile_hugs@eml.cc 2011-06-15 09:48:06 PDT ---
(In reply to comment #2)
> What should .init do for a TypeTuple like this?
> TypeTuple!(3, int).init = ?

I think raise a syntax error (or return a TypeTuple!(3, 0)).

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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull, rejects-valid
         AssignedTo|nobody@puremagic.com        |yebblies@gmail.com


--- Comment #4 from yebblies <yebblies@gmail.com> 2012-02-15 15:24:34 EST ---
https://github.com/D-Programming-Language/dmd/pull/719

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--- Comment #5 from github-bugzilla@puremagic.com 2012-02-18 20:36:14 PST ---
Commit pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/809ce857f166a48a05560da95a11fb75fcbb2c1d Merge pull request #719 from yebblies/issue4536

Issue 4536 - Typetuples (T...) should have an .init member

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yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


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