[Issue 9886] New: Cannot pass .tupleof directly to a template

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9886

           Summary: Cannot pass .tupleof directly to a template
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: andrej.mitrovich at gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich at gmail.com> 2013-04-05 12:25:56 PDT ---
template Templ(T...) { alias Templ = T; }

struct S { int x, y; }

void main()
{
    S s;
    auto tup = s.tupleof;

    auto x = Templ!(tup);  // ok
    auto y = Templ!(s.tupleof);  // ng
}

For a use-case, a recently created 'reverse' function for the Phobos Tuple type
had this implementation:

@property
auto reversed()
{
    static if (is(typeof(this) : Tuple!A, A...))
        alias RevTypes = Reverse!A;

    Tuple!RevTypes result;
    auto tup = this.tupleof;  // can't call Reverse(this.tupleof) directly
    result.tupleof = Reverse!tup;
    return result;
}

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