Is there a way to concatenate tuples at compile time in D2?  The obvious ~ operator doesn't work on tuples.  Also, while I'm at it, maybe there's a better way to achieve my end goal here.  Is there a way to get a tuple representation of a class object that includes the stuff from the base classes?

Reply to dsimcha,

> Is there a way to concatenate tuples at compile time in D2?  The
> obvious ~ operator doesn't work on tuples.  Also, while I'm at it,
> maybe there's a better way to achieve my end goal here.  Is there a
> way to get a tuple representation of a class object that includes the
> stuff from the base classes?
> 

just put them side by side.

template Tpl(T...) { alias T Tpl; }

alias Tpl!(a,b,c) A;
alias Tpl!(d,e,f) B;
alias Tpl!(A,B) C;

== Quote from BCS (ao@pathlink.com)'s article
> Reply to dsimcha,
> > Is there a way to concatenate tuples at compile time in D2?  The obvious ~ operator doesn't work on tuples.  Also, while I'm at it, maybe there's a better way to achieve my end goal here.  Is there a way to get a tuple representation of a class object that includes the stuff from the base classes?
> >
> just put them side by side.
> template Tpl(T...) { alias T Tpl; }
> alias Tpl!(a,b,c) A;
> alias Tpl!(d,e,f) B;
> alias Tpl!(A,B) C;

Sorry for the poorly worded question.  What you suggested would work for type tuples.  I'm looking for a way to do this for value tuples, i.e. the kind you would get from Object.tupleof.

Reply to dsimcha,

> == Quote from BCS (ao@pathlink.com)'s article
> 
>> Reply to dsimcha,
>> 
>>> Is there a way to concatenate tuples at compile time in D2?  The
>>> obvious ~ operator doesn't work on tuples.  Also, while I'm at it,
>>> maybe there's a better way to achieve my end goal here.  Is there a
>>> way to get a tuple representation of a class object that includes
>>> the stuff from the base classes?
>>> 
>> just put them side by side.
>> template Tpl(T...) { alias T Tpl; }
>> alias Tpl!(a,b,c) A;
>> alias Tpl!(d,e,f) B;
>> alias Tpl!(A,B) C;
> Sorry for the poorly worded question.  What you suggested would work
> for type tuples.  I'm looking for a way to do this for value tuples,
> i.e. the kind you would get from Object.tupleof.
> 

That should work there as well, if it dosn't work, it's a bug. (I think).

== Quote from BCS (ao@pathlink.com)'s article
> Reply to dsimcha,
> > == Quote from BCS (ao@pathlink.com)'s article
> >
> >> Reply to dsimcha,
> >>
> >>> Is there a way to concatenate tuples at compile time in D2?  The obvious ~ operator doesn't work on tuples.  Also, while I'm at it, maybe there's a better way to achieve my end goal here.  Is there a way to get a tuple representation of a class object that includes the stuff from the base classes?
> >>>
> >> just put them side by side.
> >> template Tpl(T...) { alias T Tpl; }
> >> alias Tpl!(a,b,c) A;
> >> alias Tpl!(d,e,f) B;
> >> alias Tpl!(A,B) C;
> > Sorry for the poorly worded question.  What you suggested would work for type tuples.  I'm looking for a way to do this for value tuples, i.e. the kind you would get from Object.tupleof.
> >
> That should work there as well, if it dosn't work, it's a bug. (I think).

Sorry, you're right.  My bad.  I thought I already had tried this and it didn't work but I guess not.  Seems to work now.

== Quote from dsimcha (dsimcha@yahoo.com)'s article
> == Quote from BCS (ao@pathlink.com)'s article
> > Reply to dsimcha,
> > > == Quote from BCS (ao@pathlink.com)'s article
> > >
> > >> Reply to dsimcha,
> > >>
> > >>> Is there a way to concatenate tuples at compile time in D2?  The obvious ~ operator doesn't work on tuples.  Also, while I'm at it, maybe there's a better way to achieve my end goal here.  Is there a way to get a tuple representation of a class object that includes the stuff from the base classes?
> > >>>
> > >> just put them side by side.
> > >> template Tpl(T...) { alias T Tpl; }
> > >> alias Tpl!(a,b,c) A;
> > >> alias Tpl!(d,e,f) B;
> > >> alias Tpl!(A,B) C;
> > > Sorry for the poorly worded question.  What you suggested would work for type tuples.  I'm looking for a way to do this for value tuples, i.e. the kind you would get from Object.tupleof.
> > >
> > That should work there as well, if it dosn't work, it's a bug. (I think).
> Sorry, you're right.  My bad.  I thought I already had tried this and it didn't work but I guess not.  Seems to work now.

Ok, now I know why this has been so weird.  Looks like we do have a legit bug here.  Your suggestion works in the toy case, but not in my actual use case.  I'll file this in Bugzilla if someone else hasn't found it already.

//The following works.
import std.stdio, std.typetuple;

void main() {
    auto foo = TypeTuple!("1 ", "2 ");
    auto bar = TypeTuple!("3");
    writeln(TypeTuple!(foo, bar));
}

//The following doesn't work.

import std.stdio, std.typetuple;

void main() {
    auto foo = new Foo;
    writeln(TypeTuple!(foo.tupleof));
}

Error messages:

D:\code\test\test3.d|13|Error: tuple is not a valid template value argument|
E:\dmd\bin\..\src\phobos\std\typetuple.d|13|template instance
std.typetuple.TypeTuple!(tuple((Foo).a)) error instantiating|

On Wed, Oct 15, 2008 at 12:05 AM, dsimcha <dsimcha@yahoo.com> wrote:

> //The following doesn't work.
>
> import std.stdio, std.typetuple;
>
> void main() {
>    auto foo = new Foo;
>    writeln(TypeTuple!(foo.tupleof));
> }
>
> Error messages:
>
> D:\code\test\test3.d|13|Error: tuple is not a valid template value argument|
> E:\dmd\bin\..\src\phobos\std\typetuple.d|13|template instance
> std.typetuple.TypeTuple!(tuple((Foo).a)) error instantiating|

http://d.puremagic.com/issues/show_bug.cgi?id=1670