July 2010 - Boost - lists.preview.boost.org

Is there any compile time/static rational numbers library in BOOST ?
by Reetesh Mukul 21 Jul '10

21 Jul '10

Hi, Is there any compile time/static rational numbers library in BOOST ? I can see that static GCD/LCM libraries are there, but could not find it for static rationals. Another question, is there any compile time library which calculates ceil value of division of one integer by another one ? With Regards, Reetesh Mukul

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First set of Boostcon 2010 videos are available
by Marshall Clow 21 Jul '10

21 Jul '10

Almost all of the Transactional Memory sessions from Boostcon are now available, with the exception of Tatiana Shpeisman's presentation on the "Draft Specification of Transactional Language Constructs for C++". That talk should (hopefully) be available tomorrow. Here are the links Maurice Herlihy : Transactional Memory Today - Keynote: http://blip.tv/file/3900047/ Justin Gottschlich:TBoost.STM Engine: http://blip.tv/file/3900167/ Tatiana Shpeisman: Draft Specification of Transactional Language Constructs for C++: <coming soon> Michael Wong: IBM's TM Research: http://blip.tv/file/3900242/ Mark Moir: Sun's / Oracle's TM Research: http://blip.tv/file/3905166/ Tatiana Shpeisman: Intel's TM Research: http://blip.tv/file/3905189/ Hartmut - I apologize for removing your (very nice) introduction for Maurice from the video. Unfortunately, Maurice was wearing the microphone, and none of what you said could be heard. -- Marshall

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[Serialization] Documentation
by Alapkumar Sinha 21 Jul '10

21 Jul '10

Hi, Can someone help me to get the pdf document for boost serialization library? I could not find the documentation in the doc folder of boost tar. The only reference I could find was " http://www.boost.org/doc/libs/1_43_0/libs/serialization/doc/index.html ". I would like to have local copy rather than access it from net every time even if it is not pdf. Regards, Alap ________________________________ This Email may contain confidential or privileged information for the intended recipient (s) If you are not the intended recipient, please do not use or disseminate the information, notify the sender and delete it from your system. ______________________________________________________________________

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Trouble caused by MPL's metafunction arity limit
by Stefan 21 Jul '10

21 Jul '10

Hello everyone. I'm working as a student on this year's GSoC and I have ran into a small problem while using MPL in my code. In a nutshell, I have a class template which takes 6 template parameters, and I would like to use it with some MPL algorithms. The problem is, MPL is configured by default to be capable of working with 5 template params only, so lambda expressions of my class won't work with MPL metafunctions. My code is header-only, meaning I cannot (re)define BOOST_MPL_LIMIT_METAFUNCTION_ARITY appropriately, as the MPL headers might have been included before my headers. Out of my 6 template params, 3 are optional, in case this is relevant or can be exploited in any way. Is there any workaround to my problem?

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Re: [boost] New name of bjam.exe
by Tan, Tom (Shanghai) 20 Jul '10

20 Jul '10

How about calling it "baby"? >Subject: [boost] New name of bjam.exe >Message-ID: <201007201245.08070.ghost(a)cs.msu.su> >Content-Type: Text/Plain; charset="us-ascii" > >Does anybody have comments, or better suggestions? > >Thanks, >Volodya

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[optional_io] Request permission to merge simple fix to optional extraction operator
by Fernando Cacciola 20 Jul '10

20 Jul '10

Hi All, It was brought to my attention that extracting an *empty* optional<> from a stream using the default provided operators (in optional_io.hpp), leaves one character behind, preventing any further extraction. This is clearly a bug so I can only guess that no one is using it (except for the user that reported it). The fix is quite trivial: https://svn.boost.org/trac/boost/changeset/64206 And I've updated the test accordingly to make sure it works. Can I marge the fix into the release branch? TIA --- Fernando Cacciola SciSoft Consulting, Founder http://www.scisoft-consulting.com

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BoostCon 2010 website
by Robert Ramey 20 Jul '10

20 Jul '10

I have a couple of requests regarding the BoostCon 2010 website. First of all , This link is very interesting and important to me. Yet it's devilish difficult to find. I shouldn't be "private". http://www.boostcon.com/community/wiki/show/private/2010/ Second, could marshal's links to the video be added to the presentation materials page? Finally could the presentation materials for each presentation be linked from the program page: http://www.boostcon.com/program Robert Ramey

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FW: New name of bjam.exe
by Tan, Tom (Shanghai) 20 Jul '10

20 Jul '10

Or, babe = Build Another Build Environment. It sound so simple and crisp, just as Bing and Google. -----Original Message----- From: Tan, Tom (Shanghai) Sent: Tuesday, July 20, 2010 7:17 PM To: 'boost(a)lists.boost.org' Subject: RE: [boost] New name of bjam.exe How about calling it "baby"? >Subject: [boost] New name of bjam.exe >Message-ID: <201007201245.08070.ghost(a)cs.msu.su> >Content-Type: Text/Plain; charset="us-ascii" > >Does anybody have comments, or better suggestions? > >Thanks, >Volodya

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[Proto] Inlining failure on gcc 4.x on 64bits linux
by joel falcou 20 Jul '10

20 Jul '10

I'm reporting this performances problem we encountered today. We have a large expression operating on table of 51200000 elements; In 32bits mode, our proto code for NT² works perfectly and output a gprofile like: http://codepad.org/Uyyvkq4X rutniem performance sis somethign like 1.5s for the whoel computation. In 64bits on linus using gcc 4.4 or 4.3, we got a massive 8.6s of runtime (!!) and the profile is: http://codepad.org/6VgRsbyR As it seems the call to proto::default_ is not inlined (hence the 5.12M calls) and take 80% of the runtime. I don't thing anything is 32/64bits specific in proto so is it a bug in gcc ? I don't have code handy here but will do tomorrow.

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Re: [boost] [msm] nested pseudo exits with same event ending up in no trans in the most outer state machine.
by Christophe Henry 20 Jul '10

20 Jul '10

Hi Richard, >Is it not allowed to use derived classes as backends ?. Actually, I don't know. I mean, I don't know of a C++ rule forbidding it, but I'm not a language lawyer. What I know is that this problem used to happen sporadically with eUML in the 2.0, but only with VC, and in this case, I see it happen also with g++ 4.4. I'd say it's a compiler bug but usually, g++ is right so I'm not sure. >I was not a ware of it. Is it mentioned in the documentation ? Probably not because I didn't see it happen any more with MSM v2.10. It used to happen with the 2.0 and only with VC and eUML. >If only composite state machines can not be derived classes of >msm:backend than this is fine because I had only one place till now >which I have changed already. We are moving inside uncharted territory. All what I can say is that it used to happen sporadically and only for eUML composites or substates. I never, in any version, saw it happen with the main fsm. Let's try to find a way around. Why do you need to use the back-end as base class? Could you elaborate? And will the need go away after I implement the previously discussed feature that you can pass to the back-end concrete substates instead of default-constructed ones? Something like what Dave suggested: player p(/* for the front-end*/ 3, "a", backend_args = ( init1=Paused("something"), init2=Playing("more data")) ); If you describe your use case, I'll try to find a solution. It'd not be the first time I find a way around compiler bugs ;-) Regards, Christophe

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