[Issue 499] New: Multiple overrides of the destructor when using signals

[Bill Baxter]

Max Samuha wrote:
> On Tue, 14 Nov 2006 02:05:36 +0900, Bill Baxter <wbaxter at gmail.com>
> wrote:
> 
> 
>>d-bugmail at puremagic.com wrote:
>>
>>>http://d.puremagic.com/issues/show_bug.cgi?id=499
>>>
>>>           Summary: Multiple overrides of the destructor when using signals
>>>           Product: D
>>>           Version: 0.173
>>>          Platform: PC
>>>        OS/Version: Windows
>>>            Status: NEW
>>>          Severity: blocker
>>>          Priority: P2
>>>         Component: DMD
>>>        AssignedTo: bugzilla at digitalmars.com
>>>        ReportedBy: maxter at i.com.ua
>>>
>>>
>>>The following gives 'test.d(233): function test.Test.Signal!(Args)._dtor
>>>multiple overrides of same function':
>>>
>>>import std.stdio, std.signals;
>>>
>>>class Args
>>>{
>>>        int foo;
>>>}
>>>
>>>class Base
>>>{
>>>        ~this()
>>>        {
>>>                writefln("Base dtor!");
>>>        }
>>>}
>>>
>>>class Test : Base
>>>{
>>>        mixin Signal!(Args) A;
>>>        mixin Signal!(Args) B;
>>>
>>>        ~this()
>>>        {
>>>                writefln("Test dtor");
>>>        }
>>>}
>>>
>>>
>>>void main()
>>>{
>>>        auto test = new Test;
>>>}
>>>
>>>//------------------------------
>>>
>>>The code compiles ok, if there is no base class or no destructor in the base
>>>class.
>>>
>>>
>>
>>This is already fixed in the version of std.signals here:
>>http://www.digitalmars.com/d/phobos/signals.d
>>
>>--bb
> 
> 
> It's not. The problem is not with signals but with mixed in
> destructors
> 
> template TDtor()
> {
> 	~this()
> 	{
> 		writefln("Mixed-in dtor");
> 	}
> }
> 
> class Base
> {
> 	~this()
> 	{
> 		writefln("Base dtor");
> 	}
> }
> 
> class Test : Base
> {
> 	mixin TDtor A;
> 	mixin TDtor B;
> 
> 	~this()
> 	{
> 		writefln("Test dtor");
> 	}
> }
> 
> void main()
> {
> 	auto test = new Test;
> }
> 
> If i get it right, this should compile and output:
> 
> Test dtor
> Mixed-in dtor
> Mixed-in dtor
> Base dtor
> 

Ah, I see.  Try moving your destrutor before the mixins.

--bb