October 2007 - Boost-users - lists.boost.org

Beginner question about PocketPC 2003
by Dmytro Bogovych 30 Oct '07

30 Oct '07

Greetings. I downloaded 1.34.1 build from Boost Consulting. It comes with prebuilt libraries for VS 2005. I like it very much as I use Boost.Thread in my projects. But this package comes without prebuild libraries for PocketPC 2003 ARM target. How can I build them? I read about bjam but don't see what arguments I should set. This - bjam --v2 "-sTOOLS=msvc" "-sBUILD=release <windows>pocketpc2003 <charset>wide <architecture>arm4" install doesn't work. Sorry for stupid question.

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[multi-index] bug or not?
by Ovanes Markarian 30 Oct '07

30 Oct '07

Hello! I have a question regarding the multi-index behaviour, Let's say I have a multi-index container containing some hashed keys. What should happen with this container is empty and I retrieve an indexed by hash view into it? I have on Visual C++ 2005 an access violation, since I am trying to retrieve a view by it's hashed keys into the const container. Many thanks, Ovanes

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Errors in custom predicate support docu
by Jens Seidel 30 Oct '07

30 Oct '07

Hi, I tried a few times to report the following bug to trac but it was always rejected as spam!?? According to http://www.boost.org/libs/test/doc/components/test_tools/custom_predicate_s… there exists a class boost::test_tools::extended_predicate_value. (Or is it a user supplied class?) Nevertheless I didn't found such a class in Boost.test and even trunk contains only predicate_result which is different. This makes predicate support very hard to use for me. Please provide proper documentation for it! I hope this is the right way to run tests in a loop and to condense the output. Jens

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serialization: curious un-serializing issue RFI
by Hugh Hoover 30 Oct '07

30 Oct '07

I have a curious problem that's just sprung up, after changing from using plain-old-pointers to using boost::shared_ptrs internally in my data structures (stl hash_map and map) The problem is that while the XML archive works correctly, both text and binary fail (they all used to work). This is using gcc 4.0.1 on darwin and VC8 on windows, boost version is 1.34.1 The failure occurs while unserializing an archive, specifically when trying to read back a shared_ptr to an already unserialized object. In the archive, it shows the object (pointer) as an object_reference (the same reference id in XML and text). While the XML version reads the pointer back correctly, the text version fails and returns NULL. I have not determined the exact reason why the text version fails (it doesn't throw, just returns NULL). The serialization does not appear to have any problems. Since my actual code is reasonably complicated, and I haven't created a simplified version that demonstrates the problem, I'm not including code now - I'd just like to find out if this sounds familiar to anyone, that is, working under XML but failing under text and binary. It does appear to be shared_ptr specific, too, since everything was working before replacing naked pointers with shared_ptrs.

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Serialization and raw pointer arrays
by Eric 30 Oct '07

30 Oct '07

Hi, I've inherited some complex math code that makes large usage of Matrices based on raw pointer arrays. I need to serialize/deserialize these arrays as is and am looking to use boost::serialization package. My attempt at doing so results in the following errors (mostly about non integral array size). As I do not know the array size when it is created (and lots of code accesses the pointer directly as a chunk of memory that has been allocated, what are my options to get this to work? Errors: /usr/include/boost/archive/detail/oserializer.hpp: In function `void boost::archive::save(Archive&, T&) [with Archive = boost::archive::text_oarchive, T = Dummy]': /usr/include/boost/archive/basic_text_oarchive.hpp:78: instantiated from `void boost::archive::basic_text_oarchive<Archive>::save_override(T&, int) [with T = Dummy, Archive = boost::archive::text_oarchive]' /usr/include/boost/archive/detail/interface_oarchive.hpp:78: instantiated from `Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = Dummy, Archive = boost::archive::text_oarchive]' serialize_array.cpp:56: instantiated from here /usr/include/boost/archive/detail/oserializer.hpp:567: error: incomplete type `boost::STATIC_ASSERTION_FAILURE< false>' used in nested name specifier /usr/include/boost/archive/detail/oserializer.hpp:567: error: size of array has non-integral type `<type error>' Code: #include <boost/serialization/split_member.hpp> #include <fstream> #include <iostream> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> using namespace std; class Dummy { public: friend class boost::serialization::access; Dummy() {pVal=NULL;size=0;} ~Dummy() {delete [] pVal;} template<class Archive> void save(Archive & ar, const unsigned int version) const { ar & size; for (int i=0; i<size; i++) { ar & pVal[i]; } } template<class Archive> void load(Archive & ar, const unsigned int version) { ar & size; pVal = new int[size]; for (int i=0; i<size; i++) { ar & pVal[i]; } } int* pVal; int size; }; BOOST_CLASS_VERSION(Dummy, 1) int main(int argc, char** argv) { Dummy d; d.size = 5; d.pVal = new int[d.size]; for (int i=0; i< d.size; i++) { d.pVal[i] = i+10; } ofstream ofOut("testSer.txt"); { boost::archive::text_oarchive oa(ofOut); oa << d; } Dummy load; { ifstream ifIn("testSer.txt"); boost::archive::text_iarchive ia(ifIn); ia >> load; } cout << "size="<<load.size<<endl; for (int i=0; i< load.size; i++) { cout << load.pVal[i] <<endl; } return -1; } Thanks, Eric

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boost.graph python bindings: read_graphml: No to_python (by-value) converter found for C++ type: struct boost::graph_exception
by John Reid 30 Oct '07

30 Oct '07

Hi, When I try to read a graphml file an exception is thrown but cannot be passed back to python through boost.python as no converter is registered. I'm using SVN version 338 from https://svn.osl.iu.edu/svn/projects_viz/bgl-python. The output is: c:\dev\python\boost\graph\__init__.py in read_graphml(filename) 624 """ 625 try: --> 626 graph = Digraph.read_graphml(filename) 627 except UndirectedGraphError: 628 graph = Graph.read_graphml(filename) <type 'exceptions.TypeError'>: No to_python (by-value) converter found for C++ type: struct boost::graph_exception If I just try the following: bgl.Graph.read_graphml(filename) I get something that might be a different symptom of the same problem: <type 'exceptions.SystemError'>: 'finally' pops bad exception The graphml file is: <?xml version="1.0" encoding="UTF-8"?>  <graphml xmlns="http://graphml.graphdrawing.org/xmlns/graphml" xmlns:y="http://www.yworks.com/xml/graphml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns/graphml http://www.yworks.com/xml/schema/graphml/1.0/ygraphml.xsd"> <key id="d0" for="node" yfiles.type="nodegraphics"/> <key id="d1" for="edge" yfiles.type="edgegraphics"/> <graph id="G" edgedefault="directed"> <node id="n0"> <data key="d0" > <y:ShapeNode > <y:Geometry x="0.0" y="0.0" width="30.0" height="30.0"/> <y:Fill color="#FFCC00" transparent="false"/> <y:BorderStyle type="line" width="1.0" color="#000000" /> <y:NodeLabel x="13.0" y="13.0" width="4.0" height="4.0" visible="true" alignment="center" fontFamily="Dialog" fontSize="13" fontStyle="plain" textColor="#000000" hasBackgroundColor="false" hasLineColor="false" modelName="internal" modelPosition="c" autoSizePolicy="content"></y:NodeLabel> <y:Shape type="ellipse"/> </y:ShapeNode> </data> </node> <node id="n1"> <data key="d0" > <y:ShapeNode > <y:Geometry x="18.0" y="68.0" width="30.0" height="30.0"/> <y:Fill color="#FFCC00" transparent="false"/> <y:BorderStyle type="line" width="1.0" color="#000000" /> <y:NodeLabel x="13.0" y="13.0" width="4.0" height="4.0" visible="true" alignment="center" fontFamily="Dialog" fontSize="13" fontStyle="plain" textColor="#000000" hasBackgroundColor="false" hasLineColor="false" modelName="internal" modelPosition="c" autoSizePolicy="content"></y:NodeLabel> <y:Shape type="rectangle"/> </y:ShapeNode> </data> </node> <edge id="e0" source="n0" target="n1"> <data key="d1" > <y:PolyLineEdge > <y:Path sx="0.0" sy="0.0" tx="0.0" ty="0.0"/> <y:LineStyle type="line" width="1.0" color="#000000" /> <y:Arrows source="none" target="standard"/> <y:BendStyle smoothed="false"/> </y:PolyLineEdge> </data> </edge> </graph> </graphml> Thanks for a great library, John.

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Re: [Boost-users] [reflection] Compilation errors
by Ovanes Markarian 30 Oct '07

30 Oct '07

Hi Christian, I assume you need to use either wchar_t or set in Visual C++ the charset not to multi-byte but not implemented. Otherwise you are trying to use pass single-byte strings as multi-byte string params. Best Regards, Ovanes On 10/29/07, Christian Henning <chhenning(a)gmail.com> wrote: > > Hi there, I just pulled the latest reflection code from the sandbox > and tried to compile the example. But unfortunately there are > compilation errors. > > For example: > > c:\boost-sandbox\boost\extension\impl\library_impl.hpp(37) : error > C2664: 'LoadLibraryW' : cannot convert parameter 1 from 'const char *' > to 'LPCWSTR' > > Is the relection lib in a usable stage? > > Thanks, > Christian > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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using ref() with threads
by Andrey Tcherepanov 30 Oct '07

30 Oct '07

Hello folks, we recently got stuck with one minor inconvenience with boost thread (which we fixed), but somehow we cannot explain why it did not work. We are using 1.34.1 and VS 2005 SP1 the sample that did not work properly was aproximately like this (not compilable) class Super_Func { protected: bool * _die; SomeObscureIPWorksBasedDaemon _daemon; public: Super_Func(bool* t) : _die(t), _daemon("localhost", 12345) {} void operator()() { while (!*_die) { _daemon.do_background_stuff(); if (_daemon.has_data()) us_process_data(_daemon.get_data()); } } }; int main() { bool die = false; Super_Func sf(&die); boost::thread main_thread(boost::ref(sf)); main_thread.join(); return 0; } Everything compiled without hick-up, and even created the thread (well, at least debugger showed it, and stopped in while loop). But all the TCP/IP related stuff in thread did not work (was sort of stuck). Once we replaced above with void Super_Func(bool* die) { SomeObscureIPWorksBasedDaemon _daemon("localhost", 12345); while (!*_die) { _daemon.do_background_stuff(); if (_daemon.has_data()) us_process_data(_daemon.get_data()); } } int main() { bool die = false; boost::thread main_thread(boost::bind(Super_Func, &die)); main_thread.join(); return 0; } everything magically worked! Well, if I do not miss some obvious error somewhere in the first example (which I might)... then I do not know why it did not work. I was under impression that ref() is just a way to pass "reference" to the anything (including functional object), so it will create copy of ref, and not Super_Func class itself. Any insight is appreciated. Thank you very much, Andrey.

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Request to know about "dynamic expression evaluation"
by Borse, Ganesh 29 Oct '07

29 Oct '07

Hi, I would like to perform the dynamic expression evaluation in my c++ application. The dynamic expressions are like the SQL queries. Since the expressions could be nested & hence the parsing & evaluation of such expressions is reducing the performance of my application. May I please know, whether BOOST provides a support for such dynamic expression evaluation in C++? Please guide. Thanks in advance for the guidance. Regards, Ganesh ============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ==============================================================================

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bis
by question boost 29 Oct '07

29 Oct '07

Hi, it seems the problem is at step 2. When I do: C:\Documents and Settings\src\boost\tools\build\v2> bjam --version I get the message: Mingwbing++ n'est pas reconnu en tant que command interne ou externe,un programme exécutable ou un fichier de commandes. Change the "\" by "/" is apparently not the solution. Thank you for your help. David _________________________________________________________________ Vous êtes plutôt Desperate ou LOST ? Personnalisez votre PC avec votre série TV préférée ! http://specials.divertissements.fr.msn.com/SeriesTV.aspx

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