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Blitz Support : |
From: Dirk Gregorius (dirk_at_[hidden])
Date: 2004-11-07 05:15:03
Thans for this detailed answer.
Have a nice weekend,
-Dirk
----- Original Message -----
From: "Julian Cummings" <cummings_at_[hidden]>
To: "'Support list for Blitz++'" <blitz-support_at_[hidden]>
Sent: Sunday, November 07, 2004 12:32 AM
Subject: RE: [Blitz-support] Version 0.8
> The "new" expression template machinery uses the Barton-Nackman trick
> (also
> known as Curiously Recursive Templates) to reduce the explosion of
> combinations that need to be handled for each of the basic binary
> operators.
> The trick is to have each class that is to be expression-enabled inherit
> from an ETBase class. The ETBase class is a template with a single
> template
> parameter. Each derived class gives itself as the template argument to
> the
> parent class ETBase. This way, the ETBase class is capable of converting
> itself (with a static_cast) to the derived type on demand. The
> inheritance
> feature reduces the number of type combinations that you have to worry
> about, while the static cast capability preserves function inlining and
> maximal performance.
>
> This template technique was developed a little after the initial
> development
> of the basic expression template technique. Thus, at some point Todd
> Veldhuizen introduced a simplified "new" ET machinery using the recursive
> templates idea and made it an option for his Array class. Since then, I
> have basically abandoned the "old" ET machinery for the Arrays because it
> is
> so much more verbose and clumsy. I have also introduced some ideas from
> PETE (the Portable Expression Template Engine) to simplify the handling of
> scalar types in Array expressions. Unfortunately, the Vector/Matrix and
> TinyVector/TinyMatrix classes continue to rest upon the old ET machinery,
> so
> we have two sets of these ET classes floating around in blitz. I intend
> to
> address this problem in the next release.
> I want to move the Vector/Matrix classes to the new ET machinery and
> segregate the Tiny classes from the non-Tiny classes in terms of ET
> support.
> This should pave the way for replacing the Tiny classes with the
> corresponding classes from the tvmet package. The tvmet classes were
> developed as a spinoff of the blitz Tiny classes, and since then they have
> become much more fully functional than the original blitz Tiny classes.
> It
> makes sense to just adopt the tvmet classes in blitz rather than
> duplicating
> all of the work that has already been done there. So that is the basic
> plan
> going forward. Of course, I make no promises on delivery dates for these
> changes, since this is purely volunteer work on my part. ;-)
>
> Regards, Julian C.
>
>
>> -----Original Message-----
>> From: blitz-support-bounces_at_[hidden]
>> [mailto:blitz-support-bounces_at_[hidden]] On Behalf Of
>> Dirk Gregorius
>> Sent: Saturday, November 06, 2004 1:03 AM
>> To: cummings_at_[hidden]; Support list for Blitz++
>> Subject: Re: [Blitz-support] Version 0.8
>>
>>
>> Thanks for the reply. You mention a newer ET machinery. What
>> do mean by
>> this?
>>
>> Regards,
>>
>> -Dirk
>>
>>
>> ----- Original Message -----
>> From: "Julian C. Cummings" <cummings_at_[hidden]>
>> To: "'Support list for Blitz++'" <blitz-support_at_[hidden]>
>> Sent: Friday, November 05, 2004 9:39 PM
>> Subject: RE: [Blitz-support] Version 0.8
>>
>>
>> > Hello Dirk,
>> >
>> > We just posted the version 0.8 release on the blitz SourceForge
>> > website
>> > (http://www.sourceforge.net/projects/blitz) yesterday. There are no
>> > major new "features" per se, as we are only doing
>> maintenance for blitz
>> > at this time. But we have standardized the usage of
>> autoconf for easy
>> > configuration and installation of blitz, improved the
>> documentation with
>> > the use of texinfo and doxygen, simplified the expression template
>> > machinery
>> > somewhat, and made Array iterators STL compliant. In
>> addition, we have
>> > addressed several bug reports from the blitz users
>> community. Please see
>> > the ChangeLog for the details. Moving forward, I intend to
>> migrate the
>> > blitz Vector and Matrix classes to the newer expression
>> template machinery
>> > that the Array class is using and finally drop the older ET
>> classes.
>> > Also,
>> > I would like to separate ET support for the
>> TinyVector/TinyMatrix classes
>> > from that of the Vector/Matrix classes and provide an
>> option for replacing
>> > TinyVector/TinyMatrix with the equivalent and more complete
>> classes from
>> > the tvmet package (http://www.sourceforge.net/projects/tvmet).
>> >
>> > Regards, Julian C.
>> >
>> > Dr. Julian C. Cummings
>> > Staff Scientist, CACR/Caltech
>> > (626) 395-2543
>> > cummings_at_[hidden]
>> >
>> >
>> >> -----Original Message-----
>> >> From: blitz-support-bounces_at_[hidden]
>> >> [mailto:blitz-support-bounces_at_[hidden]] On Behalf Of Dirk
>> >> Gregorius
>> >> Sent: Wednesday, November 03, 2004 7:07 AM
>> >> To: Support list for Blitz++
>> >> Subject: [Blitz-support] Version 0.8
>> >>
>> >>
>> >> I heard that a new version will be released soon. Does
>> anybody know
>> >> when this new release will be published and what new features it
>> >> will contain?
>> >>
>> >> Regards,
>> >>
>> >> -Dirk
>> >>
>> >> _______________________________________________
>> >> Blitz-support mailing list
>> >> Blitz-support_at_[hidden]
>> >> http://www.oonumerics.org/mailman/listinfo.cgi/blitz-support
>> >>
>> >
>> >
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>> > Blitz-support_at_[hidden]
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>>
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>
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