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digitalmars.D.bugs - [Issue 8306] New: alias 'array' this consumes array on iteration

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8306

           Summary: alias 'array' this consumes array on iteration
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: tobias pankrath.net


--- Comment #0 from Tobias Pankrath <tobias pankrath.net> 2012-06-27 01:05:37
PDT ---
Created an attachment (id=1121)
code showing the bug

The attached program produces buggy code. This code stores an index
(a list of Agg*) to some Agg and prints all Agg currently in this
index. Then it prints every Agg in turn.

In the foreach loop every agg is empty. Which is wrong. It works however, if
I comment out the alias content this; line or if I don't print the index
before the loop.

struct A
{
    int a;
    int b;
}

struct Agg
{
    A[] content;
    alias content this;
}

void main(string[] args)
{
    Agg* agg = new Agg;
    A l1 = A((1), (2));
    A l2 = A((2), (3));
    A l3 = A((3), (4));
    agg.content ~= [l1, l2, l3];

    Agg*[] aggIndex = [agg];
    writefln("these are the %s aggregates:\n%s",
                        aggIndex.length,
                        aggIndex);
    foreach(Agg* myAgg; aggIndex)
    {
        A[] as = (*myAgg).content;
        writefln("current agg %s with length %s", as, as.length);
    }
}

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next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8306


Jonathan M Davis <jmdavisProg gmx.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jmdavisProg gmx.com


--- Comment #1 from Jonathan M Davis <jmdavisProg gmx.com> 2012-06-27 01:29:29
PDT ---
On the latest master, I get the exact same behavior regardless of whether the
alias is there. I always get

these are the 1 aggregates:
[7F3AB1ECEFF0]
current agg [A(1, 2), A(2, 3), A(3, 4)] with length 3

and commenting out the first print statement has no effect on the second.

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prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=8306


Tobias Pankrath <tobias pankrath.net> changed:

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


--- Comment #2 from Tobias Pankrath <tobias pankrath.net> 2012-07-01 01:32:02
PDT ---
Can not reproduce with git master, too.

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