September 2008 - Boost-users - lists.preview.boost.org

serialization: confusing exceptions
by Ivan Godard 29 Sep '08

29 Sep '08

The exception "unregistered_cast" carries the message "unregistered void cast" when thrown, which is nowhere documented and requires reading the source to discover the relationship. The doc lists the internal names of the exceptions, whereas the user sees the associated messages. Either the doc should instead (also?) list the actual messages, or the internal and external names should be the same.

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[Statechart] Passing Arguments in the Events Concept
by Babi Seal 29 Sep '08

29 Sep '08

Hi, I have been researching the Boost archives, Tutorials, examples and I do find references to the fact that it is possible to provide arguments along with Events that a custom_reaction (in self-transition) can selectively "react" on based on the value of the argument but I am unable to articulate it using the Boost Statechart library. As reference I took the BitMachine/Performance library where the Events seemed to take a class BitNo as a parameter but I could not adapt it for my application. I am trying to control a box which has many interfaces. Each interface has an InterfaceID . I have statemachines for Box and Interface. When an interface is removed, the statemachine of the interface sends first an InterfaceDeleteTrigger event to get the Box in the InterfaceDelete_Pending state Then the Interface would like to send the actual interface Event InterfaceDelete with the Id to the Box so that the box can trigger the appropriate actions to remove the Interface. (PS - I am using two events because I read that it is not good design to try to extract triggering events and event arguments for state entry. So I tried to enter the state with a trigger event and used another instate event with actual interface id to find the actual interface). I tried something like this for the Box StateMachine : template <class InterfaceID> struct EvInterfaceDelete : sc::event< EvInterfaceDelete < InterfaceID > > {}; : : struct InterfaceDelete_Pending : sc::state < InterfaceDelete_Pending, BoxStateMachine> { typedef mpl::list< sc::custom_reaction < EvInterfaceDelete < InterfaceID> >> reactions; sc::result reaction (const EvInterfaceDelete <InterfaceID> &) { //// Sorry for my ignorance - but how I access the class InterfaceID internals so I can do something like : Box pBox = outermost_context().box; uint64_t id = InterfaceID.GetID(); pBox->DeleteInterface(id); } Thanks and I greatly appreciate if someone could point me to some examples of code where the events are passed with arguments and the values of the arguments are examined for processing. Thanks again

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Serialize dynamic_bitset?
by Simon Fraser 29 Sep '08

29 Sep '08

Does anyone have any code available to serialize dynamic_bitset? I'm guessing it would be most efficient to use from_block_range/ to_block_range and serialize the blocks one by one, or would it be reasonable to use to_string and the string constructor? I worry that care needs to be taken to avoid endianness issues. Thanks Simon

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Re: [Boost-users] [Thread] Not able to compile a program with Thread library on ARM
by Rudi Dittrich 28 Sep '08

28 Sep '08

> > Dear all, > > > > I've got the following problem: I want to use the boost threading > library provided in version 1.36 on an arm (imx31) based evaluation board with > MontaVista linux and g++ version 4.2.0 on it. > > When I try to compile the following example with my arm-g++ compiler > > > > I ran into this same problem on ARM. Sounds like you've found the > fix, but FYI: I just made Boost short-circuit the tests for > GCC-specific atomic code on ARM, and use the generic pthreads versions > instead. See the attached patch. > Hi Matthew, I compiled boost thread with your patch but I got lots of compilation errors. Maybe I haven't set-up my boost environment correctly. So could you please give me some further details / advices on your compilation setting (flags, etc.) and how I have to compile the thread library. I've added a patch which includes two specialized implementations of 'atomic_count' and 'sp_counted_base' for ARMv6 and higher which are used by shared_ptr. In my mind, this could be an optimal implementation for these architectures as I used LDREX and STREX instructions within each atomic operation. This means, that I load (using LDREX) a particular value from memory, operate on it, e.g.: increment the value, and write it back to the memory with STREX. During this computation the system assumes that no one else writes to this address. This is a very optimistic approach and does not block the external bus of the processor. Thus, others could continue with their computations which could possibly lead to a performance gain. STREX indicates whether someone has changed the value of this address during our atomic operation. If so, we have to jump back to the beginning of the operation and start the operation again. Note: I tried to implement the __sync_add...() functions which are used in the ...sync.hpp files. For a detailed description of these functions, please refer to http://www.mcs.vuw.ac.nz/cgi-bin/info2www?(gcc)Atomic+Builtins Best regards, Rudi Dittrich > -- > Matthew L. Creech >

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Re: [Boost-users] Help istalling Boost python binding
by Danilo Tomasoni 28 Sep '08

28 Sep '08

2008/9/28 David Abrahams <dave(a)boostpro.com> > on Sun Sep 28 2008, "Danilo Tomasoni" <tomasoni-AT-fbk.eu> wrote: > > > 2008/9/26 David Abrahams <dave(a)boostpro.com> > > > > on Fri Sep 26 2008, "Danilo Tomasoni" <tomasoni-AT-fbk.eu> wrote: > > > > > Dear all. > > > I have some problems installing this fantastic libraries.. > > > I have downloaded the svn version (revision 338) and the 0.9 > relased version, > > > but either haven't a setup.py file that work. > > > In bindist/ folder, there is a setup.py file, that try to install > all files in > > > bin/* > > > directory.. > > > but this folder does not exists! in bindist folder exists only > setup.py file. > > > > > > So.. how can I install python bindings for boost on my fedora 9 > machine?? > > > Thank you for advice! > > > > Please work your way through > > http://www.boost.org/doc/libs/1_36_0/more/getting_started/index.html; > it > > should help. Please also note that Boost doesn't include Python > > bindings for every library in the collection. > > > > Many thanks David for your advice! > > I have tried to follow your advice but I have encountered a little > problem, > > and I can't find the solution on documentation. > > > > When I tried to install bgl-python-0.9 (boost.graph bindigs) > > I retrieved this error: > > > > [root@ciropom bgl-python-0.9]bjam > --build-dir=/home/ciropom/Scaricati/bgl-python-0.9 > > / --toolset=gcc --build-type=complete stage > > Unable to load Boost.Build: could not find "boost-build.jam" > > --------------------------------------------------------------- > > Attempted search from /home/ciropom/Scaricati/bgl-python-0.9 up to the > root > > and in these directories from BOOST_BUILD_PATH and BOOST_ROOT: > /usr/share/ > > boost-build. > > > > So how can I load correctly Boost.Build? > > > > The documentation speak only about a "IO streams library error", and in > this case it > > isn't the problem. > > > > The documentation recommend to ask in mailing list.. > > I hope that you can help me... > > > > Many thanks for the time you spent for me! > > Well, I'm only guessing here :( > because AFAIK bgl-python isn't actually > part of Boost at all... Really? ...and.. what is AFAIK? Can you explain yourself? but if you place your bgl-python-0.9 folder > somewhere inside your Boost directory tree and then try to build from > there, you *should* have better luck. > I'll try... many thanks for your help. Tomasoni Danilo -- http://ciropom.homelinux.net L'apprendere molte cose, non insegna l'intelligenza. -- Eraclito

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Help istalling Boost python binding
by Danilo Tomasoni 28 Sep '08

28 Sep '08

2008/9/26 David Abrahams <dave(a)boostpro.com> > > on Fri Sep 26 2008, "Danilo Tomasoni" <tomasoni-AT-fbk.eu> wrote: > > > Dear all. > > I have some problems installing this fantastic libraries.. > > I have downloaded the svn version (revision 338) and the 0.9 relased > version, > > but either haven't a setup.py file that work. > > In bindist/ folder, there is a setup.py file, that try to install all > files in > > bin/* > > directory.. > > but this folder does not exists! in bindist folder exists only setup.py > file. > > > > So.. how can I install python bindings for boost on my fedora 9 machine?? > > Thank you for advice! > > Please work your way through > http://www.boost.org/doc/libs/1_36_0/more/getting_started/index.html; it > should help. Please also note that Boost doesn't include Python > bindings for every library in the collection. > Many thanks David for your advice! I have tried to follow your advice but I have encountered a little problem, and I can't find the solution on documentation. When I tried to install bgl-python-0.9 (boost.graph bindigs) I retrieved this error: [root@ciropom bgl-python-0.9]bjam --build-dir=/home/ciropom/Scaricati/bgl-python-0.9/ --toolset=gcc --build-type=complete stage Unable to load Boost.Build: could not find "boost-build.jam" --------------------------------------------------------------- Attempted search from /home/ciropom/Scaricati/bgl-python-0.9 up to the root and in these directories from BOOST_BUILD_PATH and BOOST_ROOT: /usr/share/boost-build. So how can I load correctly Boost.Build? The documentation speak only about a "IO streams library error", and in this case it isn't the problem. The documentation recommend to ask in mailing list.. I hope that you can help me... Many thanks for the time you spent for me! Tomasoni Danilo -- http://ciropom.homelinux.net L'apprendere molte cose, non insegna l'intelligenza. -- Eraclito

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Porting from boost_1_33 to boost_1_36 exception
by ipangth 28 Sep '08

28 Sep '08

I just port a project from boost_1_33 to boost_1_36 on fedora core 6. After the program run a few minutes, it crashed and got a message: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >' what(): Already open I searched the message from boost docs and google but has nothing useful. What does thi message mean? How can i catch the exception? -- Best regards, PangYongQiang

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cross-platfrom binary serialization?
by Ákos Maróy 27 Sep '08

27 Sep '08

Hi, I'm working on a cross-platform project, where we're serializing data and sending it over TCP, using boost::serialization and boost::asio. As the data is quite big, and is mainly numeric, binary serialization provides a nice advantage over XML-based serialization, both in terms of performance and data size. But, I've found that the serialized data itself is not cross-platform. E.g. if I have a simple app, that sends serialized data via a TCP connection, it works fine as long as both ends of the connection are on the same platform (say both are Linux x86_64, or both are Windows XP). but they don't interact with each other - the data sent by one platform is not accepted 'as is' by the other. I wonder what provisions have to be done to achieve binary serialization that would work in such a context? Akos

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Building boost 1.36 regex library on openwrt/optware
by Dustin Arnett 27 Sep '08

27 Sep '08

Hello, I am trying to build the regex boost library on my Asus wl500gP router. It has openwrt kamikaze 7.09/optware installed on it. Things may take a while to build, but they do build. But I am having problems getting this specific package to work. It is beyond me. All modules compile properly, the static library even links properly, just the regex shared library spits out these errors. Thanks in advance for your help in fixing this. ...updating 1 target... gcc.link.dll bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/libboost_regex-gcc34-mt-1_36.so.1.36.0 `.gnu.linkonce.t._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE15match_startmarkEv' referenced in section `.rodata' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o: defined in discarded section `.gnu.linkonce.t._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE15match_startmarkEv' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o `.gnu.linkonce.t._ZN5boost9re_detail12perl_matcherIPKcSaINS_9sub_matchIS3_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE15match_startmarkEv' referenced in section `.rodata' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o: defined in discarded section `.gnu.linkonce.t._ZN5boost9re_detail12perl_matcherIPKcSaINS_9sub_matchIS3_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE15match_startmarkEv' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE20parse_perl_extensionEv' referenced in section `.rodata' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o: defined in discarded section `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE20parse_perl_extensionEv' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE18unescape_characterEv' referenced in section `.rodata' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o: defined in discarded section `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE18unescape_characterEv' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE21parse_extended_escapeEv' referenced in section `.rodata' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o: defined in discarded section `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE21parse_extended_escapeEv' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE14add_emacs_codeEb' referenced in section `.rodata' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o: defined in discarded section `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE14add_emacs_codeEb' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE18parse_basic_escapeEv' referenced in section `.rodata' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o: defined in discarded section `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE18parse_basic_escapeEv' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE11parse_basicEv' referenced in section `.rodata' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o: defined in discarded section `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE11parse_basicEv' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o `.gnu.linkonce.t._ZN5boost9re_detail18basic_regex_parserIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE14parse_extendedEv' referenced in section `.rodata' of bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o: defined in `. "g++" -o "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/libboost_regex-gcc34-mt-1_36.so.1.36.0" -Wl,-h -Wl,libboost_regex-gcc34-mt-1_36.so.1.36.0 -shared -Wl,--start-group "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/c_regex_traits.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/cpp_regex_traits.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/cregex.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/fileiter.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/icu.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/instances.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/posix_api.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/regex.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/regex_debug.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/regex_raw_buffer.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/regex_traits_defaults.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/static_mutex.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/w32_regex_traits.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/wc_regex_traits.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/wide_posix_api.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/winstances.o" "bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/usinstances.o" -Wl,-Bstatic -Wl,-Bdynamic -lrt -Wl,--end-group -Wl,--strip-all -pthread ...failed gcc.link.dll bin.v2/libs/regex/build/gcc-3.4.6/release/threading-multi/libboost_regex-gcc34-mt-1_36.so.1.36.0... ...failed updating 1 target... Not all Boost libraries built properly.

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graphviz and bundled properties
by Will Chen 26 Sep '08

26 Sep '08

Can I use read_graphviz to initialize a graph from a *.dot file where properties are stored as bundled properties as opposed to property maps? -- William Yun Chen '09 Hinman Box 1826 Dartmouth College Hanover, NH, 03755

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