Why can't I cast from Object to Box?  That seems to defeat the purpose of boxing.  I get this error:

serverlist.d(185): e2ir: cannot cast from object.Object to Box
Internal error: e2ir.c 267

Tydr Schnubbis wrote:
> Why can't I cast from Object to Box?  That seems to defeat the purpose of boxing.  I get this error:
> 
> serverlist.d(185): e2ir: cannot cast from object.Object to Box
> Internal error: e2ir.c 267

Object o = new Object();
Box b = box(o);

foo bar = unbox!(foo)(b);

Regards,
Alexander Panek

Alexander Panek wrote:
> Tydr Schnubbis wrote:
>> Why can't I cast from Object to Box?  That seems to defeat the purpose of boxing.  I get this error:
>> 
>> serverlist.d(185): e2ir: cannot cast from object.Object to Box
>> Internal error: e2ir.c 267
> 
> Object o = new Object();
> Box b = box(o);
> 
> foo bar = unbox!(foo)(b);
> 
No luck.


import std.boxer;

void main()
{
    Object o = new Object();
    Box b = box(o);

    int bar = unbox!(int)(b);
}

c:\prog\test\D>dmd boxing2.d
c:\prog\dmd\bin\..\..\dm\bin\link.exe boxing2,,,user32+kernel32/noi;
OPTLINK (R) for Win32  Release 7.50B1
Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved

boxing2.obj(boxing2)
 Error 42: Symbol Undefined _assert_3std5boxer
--- errorlevel 1


--------
Maybe it's just a configuration problem?  I've got dmd 0.155.

Tydr Schnubbis wrote:

> Alexander Panek wrote:
>> Tydr Schnubbis wrote:
>>> Why can't I cast from Object to Box?  That seems to defeat the purpose of boxing.  I get this error:
>>> 
>>> serverlist.d(185): e2ir: cannot cast from object.Object to Box
>>> Internal error: e2ir.c 267
>> 
>> Object o = new Object();
>> Box b = box(o);
>> 
>> foo bar = unbox!(foo)(b);
>> 
> No luck.
> 
> 
> import std.boxer;
> 
> void main()
> {
>      Object o = new Object();
>      Box b = box(o);
> 
>      int bar = unbox!(int)(b);
> }
> 
> c:\prog\test\D>dmd boxing2.d
> c:\prog\dmd\bin\..\..\dm\bin\link.exe boxing2,,,user32+kernel32/noi;
> OPTLINK (R) for Win32  Release 7.50B1
> Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved
> 
> boxing2.obj(boxing2)
>   Error 42: Symbol Undefined _assert_3std5boxer
> --- errorlevel 1
> 
> 
> --------
> Maybe it's just a configuration problem?  I've got dmd 0.155.

That one's a bug with templating code inside of libraries.  You need to compile your code with -release.

~John Demme

John Demme wrote:
> Tydr Schnubbis wrote:
> 
>> Alexander Panek wrote:
>>> Tydr Schnubbis wrote:
>>>> Why can't I cast from Object to Box?  That seems to defeat the purpose
>>>> of boxing.  I get this error:
>>>> 
>>>> serverlist.d(185): e2ir: cannot cast from object.Object to Box
>>>> Internal error: e2ir.c 267
>>> 
>>> Object o = new Object();
>>> Box b = box(o);
>>> 
>>> foo bar = unbox!(foo)(b);
>>> 
>> No luck.
>> 
>> 
>> import std.boxer;
>> 
>> void main()
>> {
>>      Object o = new Object();
>>      Box b = box(o);
>> 
>>      int bar = unbox!(int)(b);
>> }
>> 
>> c:\prog\test\D>dmd boxing2.d
>> c:\prog\dmd\bin\..\..\dm\bin\link.exe boxing2,,,user32+kernel32/noi;
>> OPTLINK (R) for Win32  Release 7.50B1
>> Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved
>> 
>> boxing2.obj(boxing2)
>>   Error 42: Symbol Undefined _assert_3std5boxer
>> --- errorlevel 1
>> 
>> 
>> --------
>> Maybe it's just a configuration problem?  I've got dmd 0.155.
> 
> That one's a bug with templating code inside of libraries.  You need to
> compile your code with -release.

Ah, so I guess it's currently unusable for real projects, then.  I solved my original problem without using boxing.  So I'm okay for now. :)

Tydr Schnubbis wrote:
> Why can't I cast from Object to Box?  That seems to defeat the purpose of boxing.  I get this error:
> 
> serverlist.d(185): e2ir: cannot cast from object.Object to Box
> Internal error: e2ir.c 267

A compiler crash is never a good thing.  Please file a bug report for this :-)


Sean

Tydr Schnubbis wrote:
> John Demme wrote:
>> Tydr Schnubbis wrote:
>>
>>> Alexander Panek wrote:
>>>> Tydr Schnubbis wrote:
>>>>> Why can't I cast from Object to Box?  That seems to defeat the purpose of boxing.  I get this error:
>>>>>
>>>>> serverlist.d(185): e2ir: cannot cast from object.Object to Box
>>>>> Internal error: e2ir.c 267
>>>>
>>>> Object o = new Object();
>>>> Box b = box(o);
>>>>
>>>> foo bar = unbox!(foo)(b);
>>>>
>>> No luck.
>>>
>>>
>>> import std.boxer;
>>>
>>> void main()
>>> {
>>>      Object o = new Object();
>>>      Box b = box(o);
>>>
>>>      int bar = unbox!(int)(b);
>>> }
>>>
>>> c:\prog\test\D>dmd boxing2.d
>>> c:\prog\dmd\bin\..\..\dm\bin\link.exe boxing2,,,user32+kernel32/noi;
>>> OPTLINK (R) for Win32  Release 7.50B1
>>> Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved
>>>
>>> boxing2.obj(boxing2)
>>>   Error 42: Symbol Undefined _assert_3std5boxer
>>> --- errorlevel 1
>>>
>>>
>>> --------
>>> Maybe it's just a configuration problem?  I've got dmd 0.155.
>>
>> That one's a bug with templating code inside of libraries.  You need to compile your code with -release.
> 
> Ah, so I guess it's currently unusable for real projects, then.  I solved my original problem without using boxing.  So I'm okay for now. :)

If I remember correctly, it's because we don't have a debug build of Phobos.  You can build one yourself (ie: rebuild phobos with debug stuff in).  Or, you can do what I did and "provide" the function that it's missing:

// Burton Radons <burton-radons[at]smocky[dot]com>
// This entry allows -unittest for testing, and/or no need
// for the -release switch
private extern (C) void assert_3std5boxer() {}

I personally just stuck that in a file called "dmdbug_std_boxer_assert.d", so that I can just remove the import when it gets fixed :)

	-- Daniel

-- 

v1sw5+8Yhw5ln4+5pr6OFma8u6+7Lw4Tm6+7l6+7D a2Xs3MSr2e4/6+7t4TNSMb6HTOp5en5g6RAHCP    http://hackerkey.com/