[Issue 9854] New: Cannot directly subtype a type tuple

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9854

           Summary: Cannot directly subtype a type tuple
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          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> 2013-04-01 23:54:21 PDT ---
struct Tuple(Types...)
{
    // Error: Types is not a member of Tuple
    alias Types this;

    // ok: workaround
    alias TypeTuple = Types;
    alias TypeTuple this;
}

void main()
{
    alias T = Tuple!int;
}

A light-weight implementation of a Tuple:

struct Tuple(Types...)
{
    alias TypeTuple = Types;
    alias TypeTuple this;
}

alias Tuple!
(
     int
    ,Tuple!(float, string)
) list;

void main()
{
    pragma(msg, list[0]);
    pragma(msg, list[1]);
    pragma(msg, list[1][0]);
    pragma(msg, list[1][1]);
}

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