Map one tuple to another Tuple of different type

[Daniel Gibson via Digitalmars-d-learn]

Am 21.07.2014 03:05, schrieb Vlad Levenfeld:
> Thats real weird that it would reject your "i" variable, given that
> T.length is known at compile time. I think this is a bug. I can get your
> code to compile if I change your foreach loop to this:
>
> foreach(i, U; T)
>     modTuple[i] = transTupleElem(argTuple[i]); // ok

That works indeeed.

I also tried "foreach(int i, x; argTuple)" which also with the same 
error as "foreach(i ; 0 .. T.length)".

As a workaround I created a TupleIndices template, that would return a 
tuple with 0 .. len and did "foreach(i; TupleIndices!(T.length)" but 
that was kinda messy and reminded me of the loops I had to jump through 
in C++ to do anything useful with variadic templates..

I agree that this is a bug, but at least your workaround is much nicer, 
thanks a lot! :-)

Cheers,
Daniel

(@Vlad: Originally I answered you directly because the Thunderbird 
developers thought it was a clever idea to put an "answer" button that 
answers to the author instead of to the newsgroup prominently into the GUI)