http://d.puremagic.com/issues/show_bug.cgi?id=2814

           Summary: implicit cast (implemented via alias this) is not
                    triggered when passing to function
           Product: D
           Version: 2.027
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: 2korden@gmail.com


struct Proxy
{
        private Object o;

        Object get() { return o; }

        alias get this;
}

void foo(Object o)
{
}

void main()
{
        Proxy proxy;
        //foo(proxy); // should work, but doesn't

        Object o = proxy; // workaround
        foo(o);
}

test.d(17): Error: function test.foo (Object o) does not match parameter types
(
Proxy)
test.d(17): Error: cannot implicitly convert expression (proxy) of type Proxy
to
 object.Object


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=2814


Jarrett Billingsley <jarrett.billingsley@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jarrett.billingsley@gmail.c
                   |                            |om




--- Comment #1 from Jarrett Billingsley <jarrett.billingsley@gmail.com>  2009-08-05 18:48:39 PDT ---
Strangely, the compiler's behavior differs based on the type of the result of get().  While the workaround works in this instance (returning Object), it doesn't seem to work for any other type.  For instance, given this struct:

struct Proxy
{
    int get() { return 0; }
    alias get this;
}

If you do:

Proxy p;
int x = p;

you get an error saying it can't convert type Proxy to int.  But here's the real kicker:

Object x = p;

_Now_ the compiler says that it can't convert p.get() of type int to Object! So for some reason, it's using the alias this when it shouldn't, and not using it when it should.

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http://d.puremagic.com/issues/show_bug.cgi?id=2814


yebblies <yebblies@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |yebblies@gmail.com
           Platform|x86                         |All
            Version|2.027                       |D1 & D2
         Resolution|                            |WORKSFORME
         OS/Version|Windows                     |All


--- Comment #2 from yebblies <yebblies@gmail.com> 2012-02-04 18:31:26 EST ---
This works in current dmd (2.058)

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