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digitalmars.D.bugs - [Issue 9929] New: Need 'this' when calling template with expanded tuple

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=9929

           Summary: Need 'this' when calling template with expanded tuple
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: andrej.mitrovich gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich gmail.com> 2013-04-13
11:20:56 PDT ---
Found when implementing fix for Issue 7666:

import std.typecons;
import std.typetuple;

auto reverse(T)(T t)
    if (isTuple!T)
{
    return tuple(Reverse!(t.expand));  // fail

    auto x = t.expand;  // workaround
    return tuple(Reverse!(x));  // ok
}

void main()
{
    auto tup = tuple(1, "2");
    reverse(tup);
}

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=9929


timon.gehr gmx.ch changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |timon.gehr gmx.ch


--- Comment #1 from timon.gehr gmx.ch 2013-04-13 13:57:23 PDT ---
This issue is not specific to tuples.

struct S{ int x; }

template ID(alias T){ alias T ID; }

auto foo(){
    S s;
    auto a = ID!(s.x); // error
    auto x = s.x;
    auto b = ID!x; // ok
}

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prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=9929


timon.gehr gmx.ch changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Need 'this' when calling    |Need 'this' when accessing
                   |template with expanded      |field passed per alias
                   |tuple                       |
           Severity|normal                      |enhancement


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prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=9929


Andrej Mitrovic <andrej.mitrovich gmail.com> changed:

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


--- Comment #2 from Andrej Mitrovic <andrej.mitrovich gmail.com> 2013-04-13
14:08:20 PDT ---
Pretty sure that this is then a dupe of Issue 6842.

*** This issue has been marked as a duplicate of issue 6842 ***

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