• d-bugmail puremagic.com (37/37) Oct 13 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8815
• d-bugmail puremagic.com (8/8) Oct 13 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8815
• d-bugmail puremagic.com (26/26) Jan 26 2013 http://d.puremagic.com/issues/show_bug.cgi?id=8815

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8815

           Summary: alias modification silently fails on nested fields
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: andrej.mitrovich gmail.com



19:48:21 PDT ---
 property void modify(alias symb)()
{
    symb = new int;
}

class Foo
{
    this()
    {
        modify!(x);
        modify!(c.x);

        assert(x);    // ok
        assert(c.x);  // fail, c.x. is null
    }

    static struct C { int* x; }

    C c;
    int* x;
}

void main()
{
    auto foo = new Foo;
}

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8815




19:59:26 PDT ---
But I'm beginning to think using aliases like this isn't the best choice. For
one thing it won't work if the alias is a private symbol. It's probably best to
use templated functions that take a 'ref' parameter.

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8815




14:05:49 PST ---
I can see why, it seems "c.x" gets converted to "this.x":

 property void init(alias symb)()
{
    pragma(msg, symb);  // "this.x", should be "s.x"
    symb = new int;
}

class C
{
    this()
    {
        init!(s.x);
    }

    struct S { int* x; }
    S s;
}

void main()
{
    auto c = new C;
}

Additionally I get this in this sample:

core.exception.InvalidMemoryOperationError

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