July 2011 - Boost-users - lists.preview.boost.org

Sharing a complex object between two processes: Suggestions needed
by Nathan Lewis 15 Jul '11

15 Jul '11

Thanks so much for a great C++ library, Last night I read the complete archive looking for some tidbits of info to help me figure out how to move forward with a decision of the appropriate approach. I am fairly new to boost so I am hoping someone has some advice for my situation. I am trying to share instances of a c++ class that is auto-generated from xml schema. I am trying to hand this class off from a dll that a web service engine loads to another application for processing. This class is an in-memory implementation of the class and contains several objects which contain a lot of native stl c++ strings as well as other primitive types. I was hoping to use boosts circular buffer in shared memory, but began prototyping with a vector it and researching and I realized that the strings put in shared memory must use the basic_string construct. Having some concern about going through all of the auto generated code to change all of these types and concern over what affect that might have on the dll & service engine operation. I've seen some examples using shared memory that use the void allocator and thought maybe that is what I need to do, however I keep getting back to the fact that I've got a bunch of strings in this composite class and I don't know if that is torpedoing my attempts. I've seen there are many interprocess constructs, memory mapped regions, shared_ptrs and message ques etc. I also recently got to thinking that perhaps I should look at boost serialize to deal with the strings. I didn't want to leave the boost interprocess approach if there was some way to exchange instances of this class correctly using one of boost interprocess constructs. What I am hoping is that some could chime in with suggestions on different ways to use boost to achieve this and I'll try and go off and research it. Your input is greatly appreciated!

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[multi-array] Extracting dimension information from a multi-array
by Ryan McConnehey 15 Jul '11

15 Jul '11

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Re: [Boost-users] [Serialization] Writing an old version of a class
by Richard L. Aurbach 15 Jul '11

15 Jul '11

Don, I can't speak to what support is present in boost serialization, but I have a lot of code that needs to deal with multiple versions of classes or data structures. I've found that the best way to deal with that is to store a version number as a data member and then handle the schema evolution internally in the class. In general, it is the responsibility of a class to handle older versions "appropriately" whatever that means to you in your context. If the version number is the FIRST data member of the class (in an I/O or serialization context), then you can easily write code to handle multiple versions during I/O and/or serialization. Just my $0.02. Cheers, Rick Aurbach Aurbach & Associates, Inc. On Jul 15, 2011, at 11:00 AM, boost-users-request(a)lists.boost.org wrote: > From: Don <dm413-boost(a)intielectronics.com> > Date: July 15, 2011 7:27:07 AM CDT > To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> > Subject: [Boost-users] [Serialization] Writing an old version of a class > Reply-To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> > > > I apologize if this is a duplicate posting. I sent this 2 days ago, and it appears in the archives, but I never received it back from the list and there have been no replies, so I am posting it again. > > Using boost serialization, I would like to be able to write an old version of a class, so that I can save data in an "old" format to allow other users with an old version of my program to read the file. > > I see from the archives that this has come up before, and Robert Ramey indicated it was doable and on the todo list, but I don't see it in the release notes or documentation. Did anything every come of this? > > Or, has anyone else done this? Any suggestions on how to accomplish this? > > Thanks, > > Don

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The last (I think) of the Boostcon videos
by Marshall Clow 15 Jul '11

15 Jul '11

Chris' talk: Why C++0x is the Awesomest Language for Network Programming http://blip.tv/boostcon/why-c-0x-is-the-awesomest-language-for-network-prog… Luke's: Sweep-Line Algorithm for Voronoi Diagrams of Points, Line Segments and Medial Axis of Polygons in the Plane http://blip.tv/boostcon/sweep-line-algorithm-for-voronoi-diagrams-of-points… Boris: Boost.Process: Process management in C++ http://blip.tv/boostcon/boost-process-process-management-in-c-5368233 Joel's: Getting Jiggy with Proto — Hands-on Tutorial on C++ EDSL Design http://blip.tv/boostcon/getting-jiggy-with-proto-hands-on-tutorial-on-c-eds… Boris' other one: A Complete Overview on Boost.Jam and Boost.Build http://blip.tv/boostcon/a-complete-overview-on-boost-jam-and-boost-build-53… I think that this is all the Boostcon videos. I'll be checking later to make sure - but if you know of one that I've missed, then please let me know. BTW, Ruediger asked not to have his "Funding Boost development" talk recorded, and I didn't record any of the workshops. -- Marshall -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

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[TTI] Review Going On
by Joel Falcou 15 Jul '11

15 Jul '11

A small reminder to ask potential reviews for Edward Diener's TTI Library to do so as we are heading to the end of the review period on the 17 july. If you have comments, questions or just want to submit a review, feel free to do so.

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Problem when compiling with 1.47 on Mac OS X 10.6.8
by Frank Astier 15 Jul '11

15 Jul '11

must have done something very silly, but code that used compiled fine now gives me: g++ -gfull -Wall -Werror -fexceptions -DDEBUG_TP -Ddarwin86 -I./ -Itp_datastruct/ -Iutil/ -I/usr/local/include -I/Users/frank/Sandbox/work -c -o objs/Profile.o tp_datastruct/Profile.cpp In file included from /usr/local/include/boost/type_traits/is_class.hpp:16, from /usr/local/include/boost/type_traits/is_abstract.hpp:55, from /usr/local/include/boost/type_traits/is_convertible.hpp:25, from /usr/local/include/boost/type_traits/is_enum.hpp:19, from /usr/local/include/boost/type_traits/is_signed.hpp:15, from /usr/local/include/boost/type_traits/make_unsigned.hpp:14, from /usr/local/include/boost/lexical_cast.hpp:33, from tp_datastruct/AttributeValue.h:13, from tp_datastruct/Profile.h:10, from tp_datastruct/Profile.cpp:3: /usr/local/include/boost/type_traits/is_union.hpp:38: error: expected primary-expression before ')' token /usr/local/include/boost/type_traits/is_union.hpp:38: error: a function call cannot appear in a constant-expression Any idea?? fastier(a)yahoo.com Frank fastier(a)yahoo.com

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[GIL] Loading flipped image
by Szymon Gatner 15 Jul '11

15 Jul '11

Hi, Is it possible to flip image while it is being loaded? Png images are loaded upside-down and I currently I use copy_pixels() on flipped_up_down_view() of original image but I really wish I could avoid that step. Cheers, Szymon

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Fwd: building cufflinks has compiler error related to boost
by Michael Gooch 15 Jul '11

15 Jul '11

The following error is happening when I try to build cufflinks. I am on Red Hat Enterprise Linux 6.1 and I have installed every boost package available from the RHN repositories. (I would install directly from boost but RHN support is usually anal about using stuff from source when its available from them.) Cufflinks says it uses boost 1.38, and the package version is 1.41, so the version should be adequate. I'm somewhat lost now. This occurred after I noticed some of the pre-bulit binaries had issues with red-hat's version of the z-lib library, so I was trying to see if building the package would interface properly with the included z-lib from redhat, but then I ran into this boost problem. the error: cufflinks.o:(.rodata._ZTIN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvRK16RefSequenceTableP9HitBundleP11BiasLearnereP8_IO_FILESC_SC_ENS2_5list7INS_17reference_wrapperIS5_EENS2_5valueIS8_EENSI_ISA_EENSI_IeEENSI_ISC_EESM_SM_EEEEEE[typeinfo for boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(RefSequenceTable const&, HitBundle*, BiasLearner*, long double, _IO_FILE*, _IO_FILE*, _IO_FILE*), boost::_bi::list7<boost::reference_wrapper<RefSequenceTable const>, boost::_bi::value<HitBundle*>, boost::_bi::value<BiasLearner*>, boost::_bi::value<long double>, boost::_bi::value<_IO_FILE*>, boost::_bi::value<_IO_FILE*>, boost::_bi::value<_IO_FILE*> > > >]+0x10): undefined reference to `typeinfo for boost::detail::thread_data_base' libcufflinks.a(common.o): In function `boost::thread_specific_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::~thread_specific_ptr()': common.cpp:(.text._ZN5boost19thread_specific_ptrISsED2Ev[_ZN5boost19thread_specific_ptrISsED5Ev]+0x35): undefined reference to `boost::detail::set_tss_data(void const*, boost::shared_ptr<boost::detail::tss_cleanup_function>, void*, bool)' libcufflinks.a(assemble.o): In function `boost::thread_specific_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::get() const': /usr/include/boost/thread/tss.hpp:82: undefined reference to `boost::detail::get_tss_data(void const*)' /usr/include/boost/thread/tss.hpp:82: undefined reference to `boost::detail::get_tss_data(void const*)' /usr/include/boost/thread/tss.hpp:82: undefined reference to `boost::detail::get_tss_data(void const*)' /usr/include/boost/thread/tss.hpp:82: undefined reference to `boost::detail::get_tss_data(void const*)' /usr/include/boost/thread/tss.hpp:82: undefined reference to `boost::detail::get_tss_data(void const*)' libcufflinks.a(assemble.o):/usr/include/boost/thread/tss.hpp:82: more undefined references to `boost::detail::get_tss_data(void const*)' follow collect2: ld returned 1 exit status make[2]: *** [cufflinks] Error 1 M.Gooch

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[regex] Segmentation fault on regex_search only on CentOS
by Narinder Claire 15 Jul '11

15 Jul '11

Hi I'll illustrate the problem I have seen in the past with an example. It may or may not be directly or indirectly linked with the seg fault issue you are seeing. Although mine is not a seg fault, it does demonstrate very different behaviour between gcc on Centos (4.1.2) and gcc on Ubuntu (4.5.2) Consider the following 3 source files: main.cpp -> ---------------------------------- #include<iostream> #include"my_exception.h" using namespace std; void foo(); int main() { try { foo(); } catch(const my_exception &err) { cout << err.what(); } //catch(const exception &err) //{ //cout << "OOPs unknown error "; //} cout <<"\n"; } ---------------------------------- dll.cpp -> ---------------------------------- #include"my_exception.h" void __attribute__ ((visibility("default"))) foo() { throw my_exception(); } ---------------------------------- my_exception.h -> ---------------------------------- #include<exception> class my_exception: public std::exception { public: virtual const char* what() const throw() { return "my_exception"; } my_exception()throw(){} virtual ~my_exception()throw(){} }; ---------------------------------- and the following makefile makefile -> ---------------------------------- CXX=g++ all: $(CXX) dll.cpp -fvisibility=hidden -fPIC -shared -o libdll.so $(CXX) main.cpp -fPIC -L./ -ldll -o main clean: rm -fr lib*.so main ---------------------------------- Compiled on Centos 5.6 with gcc with the following specs: Using built-in specs. Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --disable-plugin --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic --host=x86_64-redhat-linux Thread model: posix gcc version 4.1.2 20080704 (Red Hat 4.1.2-50) The output is : terminate called after throwing an instance of 'my_exception' what(): my_exception Aborted However compiled with gcc on Ubuntu 11.04 with specs: Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.5.2-8ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-4.5/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.5 --enable-shared --enable-multiarch --with-multiarch-defaults=x86_64-linux-gnu --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib/x86_64-linux-gnu --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.5 --libdir=/usr/lib/x86_64-linux-gnu --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-plugin --enable-gold --enable-ld=default --with-plugin-ld=ld.gold --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) The output is : my_exception If I execute the Ubuntu compiled binary on Centos I still get the same 'Aborted' output. If I execute the Centos compiled binary on Ubuntu I get the expected output of the string 'my_exception' This suggests that the 'difference' is not coming from the compiler but from the runtime. As stated before this may not be related to your seg fault issue but the authors of regex could most likely tell straight away. Best Wishes N

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boost::mpl and VS 2005
by Narinder Claire 15 Jul '11

15 Jul '11

Hello, Can someone say whether it's likely to be a bug in VS2005 or if it's an oversight in MPL ? I would guess it's a bug in VS2005 and would be interested to know whether there's a workaround in Boost. Best N

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