April 2007 - Boost-users - lists.preview.boost.org

How to separate a specified library from Boost?
by Z.L. 20 Apr '07

20 Apr '07

I want to use only the random library in Boost, and the whole Boost is too big for me. I remember there seems some tool that can strip off the dependency of the single library on the other libraries in Boost, and extracts it. But unfortunately I cannot recall the name of this tool. Could somebody give me some hints or suggestions on separating a library from Boost? Thanks a lot. Z.L.

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boost serialization and RTTI
by Os 20 Apr '07

20 Apr '07

Hi, I very much want to use boost serialization but can't enable RTTI in my compiler (vc7/vc8) because of compatibility restrictions with other code. I've seen various statements on the web that boost serialization will work without RTTI, but no concrete instructions about how to make this happen. I've tried writing a trivial app using boost::archive::binary_oarchive, but I get this compiler warning (which is as good as an error): boost\smart_cast.hpp(76) : warning C4541: 'dynamic_cast' used on polymorphic type 'boost::archive::detail::basic_oarchive' with /GR-; unpredictable behavior may result So is it the case that, while serialization doesn't require RTTI, the provided archive classes do? Am I going to have to write my own archive class? Any help appreciated. cheers, os. -- os(a)collective.co.uk

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Re: [Boost-users] [thread] Problems with TSS and static threadlibrary
by Johan Nilsson 20 Apr '07

20 Apr '07

Johan Nilsson wrote: > [cross-posting this to boost.threads.devel as I tried putting out a > request for support there as well] > [snip] > As you said - the static thread_specific_ptr<> destructors are run > after on_thread_exit for the main thread (actually, some of them > before, and one of them after, which is even more confusing). Reading > the comments in tss_pe.cpp, it seems to be a deliberate decision to > run on_thread_exit from the main thread before the static destructors > are run. Perhaps to be able to use static objects safely during > "normal" thread exits? Uh, sorry. Don't know what I was thinking here .. perhaps the result of debugging the problem for an extended amount of time. / Johan

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more on lexical_cast bool
by Paul Moore 20 Apr '07

20 Apr '07

I hit the same problem that was addressed earlier in these lists The proposed solution was to juggle around with the internal streams. The problem with this (it seems to me) is that is leaking the implementation into the consumers face. We all know that lexical_cast is implemented using streaming in and out and thats what makes it pretty lightweight (in terms of the amount of code used) but thats no reason to leak the details out. The other problem is that lexical_cast is really slow; again becuase it uses such a general purpose mechanism. Its seems to me that the class needs specializing * to bool should accept true and false in any case, or 0 or any non-zero int and perhaps yes and no (this is the programmers expectation) * ints should use atoi and fixed size snprintfs * Etc... the general >> << mechanism is used if there is no specialization This makes it fast(er) and makes it opaque

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Static typing question
by Ovanes Markarian 19 Apr '07

19 Apr '07

Hello all! I have a question on static typing. Does someone know or can imagine a way on producing unique static types. An example: typedef unsigned int some_type; typedef unsigned int other_type; typedef fusion::map< fusion::pair<some_type, std::string>, fusion::pair<other_type, std::string> > my_map; my_map my_map_(fusion::make_pair<some_type>("some_type"), fusion::make_pair<other_type>("other_type")); at_key<other_type>(my_map) should return "other_type" and not "some_type" Many thanks in advance. With Kind Regards, Ovanes

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[fusion] error in map docs
by Ovanes Markarian 19 Apr '07

19 Apr '07

Hello! Thanks for the great lib again. I was using a fusion::map container and discovered the following error at: http://spirit.sourceforge.net/dl_more/fusion_v2/libs/fusion/doc/html/fusion… The exsample states: typedef map< pair<int, char> , pair<double, std::string> > map_type; map_type m( make_pair<int>('X') , make_pair<double>("Men")); std::cout << at<int>(m) << std::endl; std::cout << at<double>(m) << std::endl; ^^-- error Where it should be not at<TYPE>(...) but at_key<TYPE>(...). With Kind Regards, Ovanes

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Bill Lear: "Re: store vector<> to filesystem (newbie question)"
by Gennady Khokhorin 19 Apr '07

19 Apr '07

Bill, it is the same message with different subject. I'm not sure if previous will show up on this thread as a respond to your sending. -----Original Message----- From: Gennady Khokhorin Sent: Wednesday, April 18, 2007 2:45 PM To: 'boost-users(a)lists.boost.org' Subject: Re: store vector<> to filesystem (newbie question) >template<typename Archive> >struct Serializer { > static void save(const vector<double>& timeStamps) { > std::ofstream ofs("file.bin", std::ios::binary); > > Archive oa(ofs); > oa << timeStamps; > } >}; > >Serializer<binary_oarchive>::save(timeStamps); Thanks, Bill, for your fast respond! Started reading serialization. Did try to use serialization from your sample, got stuck with error message: Error 20 error C2039: 'serialize' : is not a member of 'std::vector<_Ty>' c:\boost\include\boost-1_33_1\boost\serialization\access.hpp 109 Is it restriction sign for using std::vector<> with << operator or I'm missing some headers? my settings: #include <boost\archive\binary_oarchive.hpp> using namespace boost::archive; gok

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Re: [Boost-users] Boost and Intellisense...
by james.jones＠firstinvestors.com 19 Apr '07

19 Apr '07

From: "Ferng, Andrew D" <andrew.d.ferng(a)boeing.com> > I've also seen this occur with BGL. Before I make a call to > connected_components, it's fine. Afterwards, intellisense no longer > works. > Maybe VS has an issue with reading hpp? Just my wild guess... My guess is that IntelliSense just doesn't work with templates - whenever I've introduced templates into my code (BOOST or not), IntelliSense becomes UnintelliSense. I also think this isn't too surprising. Considering the potential complexity of templated code, expecting IntelliSense to handle it well is probably not reasonable - IntelliSense would have to *execute* the entire template metaprogramming subset of C++ "on the fly" to handle template types completely. - James Jones Administrative Data Mgmt. Webmaster 375 Raritan Center Pkwy, Suite A Data Architect Edison, NJ 08837

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BoostCon conference calls?
by Dave Jenkins 19 Apr '07

19 Apr '07

Does anyone know if the Aspen Center for Physics makes any conference calling facilities available to BoostCon? Because I was wondering, if special interest groups want to get together informally and have people call in and participate from wherever they are, could we do it? I know Joel de Guzman is talking about getting the Spirit group together informally for "feedback, comments and in general, discussion about what's to come" and it would be great if people not at the conference could participate. I don't know how well this would work and I don't know if Joel would like it (pizza and beer were mentioned, which don't transmit well over the phone lines), but it seems like BoostCon is a great opportunity for groups to get together and brainstorm about the future. See you at BoostCon! Dave Jenkins

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Re: [Boost-users] Bill Lear store vector<> to filesystem (newbie
by Gennady Khokhorin 19 Apr '07

19 Apr '07

Thanks, Bill! Its working! I was missing <boost/serialization/vector.hpp> header. Happy programming! gok

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