RE: Possible to use multiple Slots

I wouldn't worry too much. As you just figured out, the compiler is right: int32_t is too small for a pointer on a 64bit architecture. I always use a Long_t (or ULong_t) when casting pointers, but using size_t doesn't hurt and is maybe cleaner. Up to you ;)

Cheers, Bertrand.

-----Original Message-----
From: Georg Troska [mailto:georg.troska_at_uni-dortmund.de] Sent: 14 December 2011 15:03
To: Bertrand Bellenot
Cc: roottalk_at_lxroot01.cern.ch; Stephan von Kleist Subject: Re: [ROOT] Possible to use multiple Slots

Hi,

Yes I tried it with size_t on 64 bit and it works

But - I do not exactly know why :-)
Seems to be an implicit type cast - but in which kind of variable?

I just tried to cast to int64_t - this works. int32_t does not complie! The error is

slot.h:24: error: cast from 'Data*' to 'int32_t' loses precision

Maybe the compliler recognises an invalid kind of cast. Could be that I was too afraid of this. Would you recommend to use Long_t or size_t?

Georg
Am 14.12.2011 um 14:28 schrieb Bertrand Bellenot:

> Hi Georg,
>
> Well, I think Long_t follows the architecture (32bit/64bit)... I only tried on 32bit, and it works
> And did you try with size_t? (it works also on 32bit)
>
> Cheers, Bertrand.
>
> -----Original Message-----
> From: Georg Troska [mailto:georg.troska_at_uni-dortmund.de]
> Sent: 14 December 2011 14:10
> To: Bertrand Bellenot
> Cc: roottalk_at_lxroot01.cern.ch; Stephan von Kleist
> Subject: Re: [ROOT] Possible to use multiple Slots
>
> Hi Bertand,
>
> worked! Great. Thank you very much
>
> I'm a bit afraid that the cast of a pointer into a Long_t depends on the system. The pointer might be either 32 bit or 64 bit long. I tried if it worked with a size_t, which is, as far as I understand made for thinks like this (It is 32bit long on a 32bit system, and 64bit on a 64bit system). This works too, but why isn't there Emit-method for a size_t?
>
> I do not have a chance here to test it on 32 bit. Do I need to worry?
>
> Georg
>
>
>
> Am 13.12.2011 um 09:31 schrieb Bertrand Bellenot:
>

>> Hi Georg,
>> 
>> Could you try to replace:
>>  EmitVA("sendData(Data*)",1,d);
>> By:
>>  Emit("sendData(Data*)",(Long_t)d);
>> 
>> And try again? (this works fine for me)
>> 
>> Cheers, Bertrand.
>> 
>> -----Original Message-----
>> From: Georg Troska [mailto:georg.troska_at_uni-dortmund.de] 
>> Sent: 12 December 2011 17:07
>> To: Bertrand Bellenot
>> Cc: roottalk_at_lxroot01.cern.ch; Stephan von Kleist
>> Subject: Re: [ROOT] Possible to use multiple Slots
>> 
>> Hello Betrand,
>> 
>> thank you very much for your responds. I was able to create a simple script, showing the error:
>>