RE: Possible to use multiple Slots

On Wed, 14 Dec 2011 14:49:50 +0000, Bertrand Bellenot <Bertrand.Bellenot_at_cern.ch> wrote:
> 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 ;)

shouldn't you just use (u)intptr_t for that job ?

http://en.wikipedia.org/wiki/C_data_types#Fixed_width_integer_types

-s

>
> 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:
> >>
> >
>

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