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[iterator] readable and writable transform_iterator
by Chris Weed 14 Nov '07

14 Nov '07

I can't figure out how to make a writable transform_iterator work. Here is what I have: #include <boost/iterator/transform_iterator.hpp> #include <boost/tuple/tuple.hpp> #include <vector> template< int N > struct Get { template<typename T> struct result; template<int M,typename T> struct result<Get<M>(T&)> { typedef typename boost::reference_wrapper<typename boost::tuples::element<M,T>::type>::type type; }; template<typename Tup> typename result<Get<N>(Tup&)>::type operator()(Tup& t) { return boost::tuples::get<N>(t); } }; int main() { std::vector<boost::tuple<int,float> > v1; v1.push_back(boost::make_tuple(1,2.2f)); v1.push_back(boost::make_tuple(2,3.2f)); std::vector<boost::tuple<int,float> > v2(2); std::copy(boost::make_transform_iterator(v1.begin(),Get<0>()), boost::make_transform_iterator(v1.end(),Get<0>()), boost::make_transform_iterator(v2.begin(),Get<0>())); } g++ seems to get hung up on figuring out the result type of Get<0>. Any help would be greatly appreciated. Chris

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"Getting Started" document : missing documentation of the stdlib flag (fwd)
by Vincent Torri 14 Nov '07

14 Nov '07

Hello, no news about that request ? thank you Vincent Torri ---------- Forwarded message ---------- Date: Sat, 3 Nov 2007 11:15:13 +0100 (CET) From: Vincent Torri <vtorri(a)univ-evry.fr> To: boost-users(a)lists.boost.org Subject: "Getting Started" document : missing documentation of the stdlib flag Hello, If I'm not mistaken, to compile boost with STLport, one must pass -stdlib=stlport (or something like that) to bjam. But it's not mentionned in the "Getiing Started" documentation (Unix or Windows), while STLport itself is mentioned. Also, stdlib is mentioned when I launch bjam with --help, --help-options or --help-internal. Can someone add the documentation of the stdlib flag in "Getting Started", please ? (and maybe also in the boost build, to get doc with bjam --help) Thank you Vincent Torri

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Fwd: bind, template member function and thread
by Ovanes Markarian 14 Nov '07

14 Nov '07

On 11/13/07, Olivier Tournaire <olitour(a)gmail.com> wrote: > > Yep, that what I tried, but it does not work. The compiler error is > described below. This is really strange. This code compiles fine: typedef bool (Profile::*mem_fcn)(boost::shared_ptr< TTImage <unsigned char> >, eInterpolatorType); mem_fcn f = &Profile::template ComputeRadiometries<unsigned char>; and the doc example states for member functions: boost::function<int (X*, int)> f; f = &X::foo; X x; f(&x, 5); But I also got errors. Regards, Ovanes

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Is Anyone going to tell me the way to Build BOOST?
by question boost 14 Nov '07

14 Nov '07

Hi, at boost root directory i do: C:\Program Files\boost> bjam ^More? --build-dir=C:\Program Files\boost \directory_1 ^More? --toolset=gcc stage the error message is the following :could not find main target assuming it's a name of a file to create could not find main target C:\Program Files\boost \directory_1 assuming it's a name of a file to create... note:C:\Program Files\boost is my boost root directory, stage a subdirectory of directory_1 Be very clear THANK YOU, David _________________________________________________________________ Découvrez le blog Messenger Le Meilleur du Web : toutes les vidéos qui buzzent le plus sur Internet ! http://meilleurduweb.spaces.live.com/

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Boost - Build Directory Problem
by chandra_india＠webdunia.com 14 Nov '07

14 Nov '07

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[filesystem] sugges: directory_begin(), directory_end()
by v2cechura 14 Nov '07

14 Nov '07

I would suggest introduction of (template) functions that would return "begin" and "end" directory iterators. I think that it's clearer to see: for_each(directory_begin( dir_path ), directory_end(), do_something()); than for_each(directory_iterator( dir_path ), directory_iterator(), do_somethig()); The functions directory_begin()/directory_end() would mimic the convenient container.begin()/container.end() functions used in STL. I know that it's merely a decoration but so is std::make_pair. It could just be: template <class Path> inline class basic_directory_iterator<Path> directory_begin(const Path& dp) { return basic_directory_iterator<Path>(dp); } template <class Path> inline class basic_directory_iterator<Path> directory_end() { return basic_directory_iterator<Path>(); } Vaclav Cechura

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Boost semaphore with condition variable
by f＠rtfs.org 14 Nov '07

14 Nov '07

Hi! I have a quite simple problem, but I still lack a nice implementation in C++ with boost. My problem is, that I have two threads A and B and thread A needs some information that B will calculate at runtime. Therefore I need some kind of synchronization. So my first attempt was to use a mutex and a condition variable: Thread A: boost::thread::mutex::scoped_lock lock ( mMutex ); mConditionVar.wait ( lock ); Thread B: mConditionVar.notify_one (); This works nice as long as thread A already started waiting on the condition before thread B finished providing it. Otherwise the notify will be lost. So my second attempt was to use a barrier: Init barrier with count 2 Thread A: mBarrier.wait (); Thread B: mBarrier.wait (); This works fine and A will wait until the result is available and it doens't matter if it starts waiting before or after B finished calculaating. But the problem now is that B also needs to wait for A to reach the point in execution. So if I just want to signal thread A from thread B that some point was reached . I don't know how to do it with boost. If I would have a semaphore available I could init it with 0 and thread A tries to decrement it while thread B will increment it once it reached the point. But http://www.boost.org/doc/html/thread/faq.html#id1747096 says: "Semaphore was removed as too error prone. The same effect can be achieved with greater safety by the combination of a mutex and a condition variable." So how exactly is this achived with the mutex and condition variable. I always only come up with a mutex, condition variable and a bool which all three must be shared between both threads. I would greatly appreciate any suggestions! Thanks, Fabian

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Re : RE : Re: compilation trouble with boost::regex
by hallouina-ml＠yahoo.fr 14 Nov '07

14 Nov '07

Thanks for your answer, I think it's clear : So you mean that BOOST_REGEX_MATCH_EXTRA is made for matching for exemple somethingsomething in the string : "blablablasomethingsomethingblablabla". Is it right? In fact I want extract all the link from a webpage. I want to used the regex because this is faster than doing a DOM tree from the webpage. So I want doing the perl equivalent of @matches =~ m/.*(regex_of_the_url_with_href).*/gs g flag because I want extract all of the url. s flag beacause I want that "." match "\n" too. ----- Message d'origine ---- De : John Maddock <john(a)johnmaddock.co.uk> À : boost-users(a)lists.boost.org Envoyé le : Mardi, 13 Novembre 2007, 17h13mn 26s Objet : Re: [Boost-users] RE : Re: compilation trouble with boost::regex hallouina-ml(a)yahoo.fr wrote: > I need Perl style capture like m/(some_regex)/g > > because I need the g flag (to capture more than one time my regex). So > if I understand the documentation (as you can see, my english is far > from beeing perfect...) ; if I want to use the g flag equivalent in my > regex, I need to enable this feature. Oh no you don't :-) The Perl /g flag is something different again: the equivalent functionality in Boost.Regex is regex_iterator, which enumerates one at a time over all the possible matches in a string. Repeated captures come into play when you have say an expression "(something)+" matched against "somethingsomething" in which case in Perl: $0 = "somethingsomething" $1 = "something" With BOOST_REGEX_MATCH_EXTRA enabled then $1 contains a list of all the "something"'s matched by the first capturing group within a single overall match. I hope this is clear, Regards, John Maddock. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _____________________________________________________________________________ Ne gardez plus qu'une seule adresse mail ! Copiez vos mails vers Yahoo! Mail

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boost-users [program options, tuple]
by chun ping wang 14 Nov '07

14 Nov '07

Hi i would like to know how to make program options play nicely with tuple. int main( int ac, char* av[] ) { namespace po = boost::program_options; po::options_description desc("Allowed options"); std::vector<BigInteger> key_pair; desc.add_options() ("generate", "generates a pair of key") ("secert", po::value(&key_pair)->multitoken(), "creates the share secret key"); po::variables_map vm; po::store(po::parse_command_line(ac, av, desc), vm); po::notify(vm); try { if (vm.count("generate")) { BigInteger my_prime = encryptcpw::random_prime<BigInteger>(&algocpw::Solovay_Stressen<BigInteger>, 16); std::cout << "my prime: " << my_prime << "\n"; boost::tuple<BigInteger, BigInteger> pare(encryptcpw::dh_init<BigInteger>( my_prime )); std::cout << "pair of generated number: " << pare << "\n"; } if (vm.count("secert")) { const BigInteger p( encryptcpw::random_prime<BigInteger>(&algocpw::Solovay_Stressen<BigInteger>, 16)); std::cout << encryptcpw::dh_secret<BigInteger>( p, key_pair[0], key_pair[1]); } } catch (const char* error) { std::cerr << error << "\n"; } } I would like to replace vector with tuple. boost::tuple<BigInteger, BigInteger> key_pair; for some reason doing that cause the program to crash.. when run DiffieHellman --generate 1371 2397

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template specializing question (boost::static_visitor related)
by jono 14 Nov '07

14 Nov '07

hello all. i have a boost::static_visitor that delegates to a static function to enable partial specialization... /// the templates & so on are declared as so ...... /// /// /// ============================================================= typedef enum {ADD, SUBTRACT, MULTIPLY, DIVIDE, EQUAL, LESS} BinaryOp; template<BinaryOp op, typename ObjectT> Object binary_op(const ObjectT &arg1, const ObjectT &arg2) {return undefined;} template<BinaryOp op, typename ObjectT, typename ObjectU> Object binary_op(const ObjectT &arg1, const ObjectU &arg2) {return undefined;} template<BinaryOp op> class BinaryOpVisitor : public boost::static_visitor<Object> { public: template<typename ObjectT, typename ObjectU> Object operator()( const ObjectT &arg0, const ObjectU &arg1) const { return binary_op<op, ObjectT, ObjectU>(arg0, arg1); } template<typename ObjectT> Object operator ()(const ObjectT &arg0, const ObjectT &arg1) const { return binary_op<op, ObjectT>(arg0, arg1); } }; /// ============================================================= /// /// then i have specialized the binary_op function as follows.... /// /// ============================================================= template<> Object binary_op<ADD>(const Integer& arg0, const Integer& arg1) {return make< Integer >(arg0 + arg1);} template<> Object binary_op<ADD>(const Real& arg0, const Real& arg1) {return make< Real >(arg0 + arg1);} /// ============================================================= /// /// the problem arises when i want to apply an operator to heterogenous but convertible types, eg: Integer + Real /// /// ============================================================= template<> Object binary_op<ADD>(const Integer& arg0, const Real& arg1) {return make< Real >(arg0 + arg1);} template<> Object binary_op<ADD>(const Real& arg0, const Integer& arg1) {return make< Real >(arg0 + arg1);} /// ============================================================= /// /// as shown, i can get the result i want by explicitly specializing each combination of operands, /// but if i add a Complex, then a Rational, then a Modulus and so on, i end up with a combinatorial explosion. /// /// i would like to find a way of doing all this with a single specialization for each pair of heterogenous operands, /// such that they can be accepted in any order... /// any takers? cheers Jono Poff Day One Digital Media Auckland, NZ

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pulling my hair out over Leopard
by Mark Roden 14 Nov '07

14 Nov '07

Hi everyone, I'm trying to get leopard and boost to play nice, so that I can use dicomlib for another app. Apparently, dicom lib requires boost, because it gives 116 error messages if you try to compile in xcode without it. To repro: 1) download dicomlib from http://dicomlib.swri.ca/joomla/index.php?option=com_remository&Itemid=26&fu… 2) put those files into an xcode project 3) watch as they don't compile with 116 errors all related to boost I've tried: 1) including the boost header files in the xcode project. xcode doesn't care unless I change all the < to ", which is painful, time consuming, and frankly, stupid. 2) installing boost at /usr/local/include using ./configure make sudo make install as an administrator. Of course, the boost library is handily titled 'boost-1_34_1' instead of something like 'boost', which means that I have to soft link it using ln -s. Neither the regular install nor the ln option gets around the 115 compile errors. 3) I tried bjam -sTOOLS=darwin and bjam -sTOOLS=darwin -sBUILD=framework, neither of which work, both of which give errors that ld -h is an unrecongized option. I don't know where the linker options are defined, so maybe just getting rid of -h would do it, but that switch probably means something, so just wholesale removing a compiler switch may not be the best move. So here's the real question: How do I make this work? I've lost about 24 hours to this, and I just don't see how it's gonna work. In the meantime, I'm guessing I'm gonna go with http://www.apple.com/downloads/macosx/math_science/quickdicomtoolkit.html but knowing my luck, that will require something similar as well.... Thanks for your help, Mark

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[BGL] Problem while "clearing" a graph
by Olivier Tournaire 13 Nov '07

13 Nov '07

Hi all, i'm trying to clear an adjacency_list. I do the following, as described in the documentation : void MPPRectangleGraph::Clear(unsigned int flags) { bool erase_nodes = false, erase_edges = false, erase_all = false; if ( flags&GraphErase::eERASE_ALL ) erase_all = true; else { if ( flags&GraphErase::eERASE_NODES ) erase_nodes = true; if ( flags&GraphErase::eERASE_EDGES ) erase_edges = true; } if ( erase_nodes || erase_all ) { std::cout << "begin" << std::endl; MPPRectangleGraph::vertex_iterator vi, vi_end, next; boost::tie(vi, vi_end) = vertices(*this); unsigned int i=0; std::cout << num_vertices(*this) << std::endl; //clear_vertex(*vi, *this); //remove_vertex(*vi, *this); for (next = vi; vi != vi_end; vi = next) { std::cout << i++ << std::endl; ++next; clear_vertex(*vi, *this); remove_vertex(*vi, *this); } } std::cout << "end" << std::endl; } The MPPRectangleGraph is simply derived from adjacency_list. Containers are boost:vecS for both vertices and edges. When I have 100 vertices in my graph, I catch an unhandeld exception with catch(...) ("i" is printed only unitl 50), and, when my graph contains only 3 nodes, a std::exception is catched with this message : "vector<T> too long". Can you help ? Regards.

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bind, template member function and thread
by Olivier Tournaire 13 Nov '07

13 Nov '07

Hi all, I would like to use thread with a member function which takes parameters. Here is the code I actually use : shared_ptr<Profile> p2 ( new Profile(origine+(double)i*width_sur_nb_fois_wdir,rect->GetHeightDirection(),MPPParameters_.ProfilesNbPoints_,MPPParameters_.ProfilesDistancePoints_ ) ); shared_ptr<Profile> p3 ( new Profile(origine+(double)(-i)*width_sur_nb_fois_wdir,rect->GetHeightDirection(),MPPParameters_.ProfilesNbPoints_,MPPParameters_.ProfilesDistancePoints_ ) ); p2->ComputeRadiometries(image_,BILINEAR); p3->ComputeRadiometries(image_,BILINEAR); ComputeRadiometries is a template member function : template <class T> bool ComputeRadiometries( boost::shared_ptr< TTImage <T> > image , const eInterpolatorType type_interpolator=BICUBIC ) This compiles fine : boost::function<bool (Profile*, boost::shared_ptr< TTImage <unsigned char> >, eInterpolatorType)> f; But, this does not : f = &Profile::ComputeRadiometries; I would like to use boost::bind in order to call ComputeRadiometries with a thread. Can you help ? Regards -- Le temps des cerises reviendra. Dans l'immédiat, c'est le temps des noyaux. Courage.

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[serialization] Making a "new" primitive type
by Robert Bielik 13 Nov '07

13 Nov '07

In a project using JUCE (http://www.rawmaterialsoftware.com) I want to serialize the juce::String, preferably so it's equivalent of serializing std::wstring. How would I go about doing a wrapper for it so boost::serialization can serialize it nicely? TIA /Rob

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compilation trouble with boost::regex
by hallouina-ml＠yahoo.fr 13 Nov '07

13 Nov '07

Hello everybody, I begin with C++ and need to use some regex in my program. So I try to compile this example from the boost website : http://www.boost.org/libs/regex/example/snippets/captures_example.cpp but I get this error : ~/developpement/essai_regex/boost$ g++ -o test captures_examples.cpp captures_examples.cpp: In function «void print_captures(const std::string&, const std::string&)": captures_examples.cpp:43: erreur: «class boost::smatch" has no member named «captures" captures_examples.cpp:49: erreur: «class boost::smatch" has no member named «captures" I have already installed this library : ii libboost-regex-dev 1.34.1-2ubuntu1 regular expression library for C++ ii libboost-regex1.34.1 1.34.1-2ubuntu1 regular expression library for C++ I supposed that the exemple from the official website is right. So the problem must come from my configuration. I already try this compilation option : -lboostregex -lboost_regex -lboost-regex -lboost_regex_dev -lboost_regex-1_34_1 -lboost_regex-mt-d-1_34_1..... But I always get the same error. somone have an idee to resolved this problem please? Some clue...? Thanks for your attention. Zorg. _____________________________________________________________________________ Ne gardez plus qu'une seule adresse mail ! Copiez vos mails vers Yahoo! Mail

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[boost] boost::function regression in 1.34.0 wrt -fno-exceptions
by Peter Soetens 13 Nov '07

13 Nov '07

Hi, Upto boost 1.33.x, I could compile my program with the gcc option -fno-exceptions. Since boost 1.34.0, this is no longer possible due to code changes in operator= in boost/function/function_template.hpp The following snippets fail to compile: Line 561-571: operator=(Functor BOOST_FUNCTION_TARGET_FIX(const &) f) { this->clear(); try { this->assign_to(f); } catch (...) { vtable = 0; throw; } return *this; } and lines 589-602: // Assignment from another BOOST_FUNCTION_FUNCTION BOOST_FUNCTION_FUNCTION& operator=(const BOOST_FUNCTION_FUNCTION& f) { if (&f == this) return *this; this->clear(); try { this->assign_to_own(f); } catch (...) { vtable = 0; throw; } return *this; } The 1.33.0 and older versions used swap() instead of this try / catch / throw construct. These versions also used the boost::throw_exception function instead of a plain throw. Any rationale for this decision ? Should some/all boost functions compile exception free as well ? I'm using -fno-exceptions on embedded systems. Peter -- Peter Soetens -- FMTC -- <http://www.fmtc.be>

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building boost.python
by Maik Beckmann 13 Nov '07

13 Nov '07

Hello I want to help those who have problems with using bjam to build boost.python (or other libs). I assume you're - running linux with a proper installed gnu toolchain or - running Windowshave a proper installed mingw incl. g++ and mingw-make32 Copy this Makefile to your boost folder: <Makefile> WITH_LIBS= #WITH_LIBS+= --with-regex #WITH_LIBS+= --with-filesystem #WITH_LIBS+= --with-program_options #WITH_LIBS+= --with-thread #WITH_LIBS+= --with-signals #WITH_LIBS+= --with-test WITH_LIBS+= --with-python ########## BJAM executable # set BJAM_EXE to /path/to/prebuild/bjam(.exe) # #### Windows: got it from http://sourceforge.net/projects/boost/ BJAM_EXE=boost-jam-3.1.15-1-ntx86/bjam.exe # ##### Linux: build myself by $ cd tools/jam/src && sh build.sh # x86 (32-Bit): #BJAM_EXE=tools/jam/src/bin.linuxx86/bjam # x86_86 (64-Bit): #BJAM_EXE=tools/jam/src/bin.linuxx86_64/bjam BJAM:=$(BJAM_EXE) -j2 -d+2 BOOST_VARIANT=release # no need to set PYTHONPATH on Linux, but # if I'm on Windows export PYTHONPATH=C:\Python25 all: $(BJAM) variant=$(BOOST_VARIANT) $(WITH_LIBS) --toolset=gcc stage </Makefile> Change the paths (i.e. PYTHONPATH) to make them point to the right location. Now start a command terminal, cd to the boost folder an run - make or respectively - mingw32-make It works without an user-config.jam file at your $HOME folder. Porting this Makefile to nmake shouldn't be hard, but I don't have access to a recent msvc. Note that this Makefile is simplified from the one I actually use to make it more newbie friendly. If some of you are using Linux and cygwin/MSYS/cli on Windows I can post a more intelligent one. Best Regards, - Maik Beckmann

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Re: [Boost-users] Boost-users Digest, Vol 1449, Issue 1
by Vial, Florent 13 Nov '07

13 Nov '07

>Be very clear Well you don't seem to be clear yourself... Arnold & Richter Cine Technik GmbH & Co. Betriebs KG Sitz: Munchen - Registergericht: Amtsgericht Munchen - Handelsregisternummer: HRA 57918 Personlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH Sitz: Munchen - Registergericht: Amtsgericht Munchen - Handelsregisternummer: HRB 54477 Geschaftsfuhrer: Prof. Dr. Dejan Ilic; Franz Kraus; Jens Schafer Beiratsvorsitzender: Prof. Dr. Hans-Jorg Bullinger

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[ptr_container] Using bind with ptr_map
by Bill Buklis 13 Nov '07

13 Nov '07

Is there a way to use bind with ptr_map? The following fails to compile (but does work with std::map): typedef boost::ptr_map<int,int> TESTMAP; boost::bind( &TESTMAP::value_type::first, _1 ); This errors with pointer to reference member is illegal (C2634 in VC++ 8). Strangely enough this also generates an internal compiler error in VC++ 8 (along with the proper error messages). But that's another story. -- Bill --

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Boost.Date_Time and quarters, incomplete (or unknown) dates
by Christoph 13 Nov '07

13 Nov '07

Is there special support in Boost.Date_Time to support quarters, or (just) years? Consider the following scenario: I have a customer (or patient) whose (exact) date of birth is not known, only that 'he was born in 1960' or in 'May 1960' (w/o attached information on month or days). Is there another way to handle this (and preserve knowledge about the incomplete information) besides pretending that month (and perhaps even day) is 1 and storing additional flags about the information being not actually present? Best regards Christoph

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[rfc] getting the dataflow library ready for submission
by Stjepan Rajko 13 Nov '07

13 Nov '07

Hello all, I am getting close to having the Dataflow library ready to be submitted for review, and would like to respark some interest. The current version of the library offers a generic layer for dataflow programming that can be applied to various data transport mechanisms, and a Dataflow.Signals support layer for Boost.Signals that provides a number of general-purpose components and easy connectability. In the near future I will try to put together more real-world examples of how this library can be useful, but for now the docs have two possibly interesting examples: * an example of how to provide a support layer for another mechanism, with VTK as the victim. * an example of how to use the Dataflow.Signals layer with Boost.Asio and Boost.Serialization to make a distributed dataflow network. The docs are uploaded to: http://dancinghacker.com/code/dataflow/ Code is available from the boost sandbox (SOC/2007/signals), as well as the boost vault (Dataflow directory). All tests (with 1 exception) pass on GCC 4.0.1/darwin and MSVC8. The docs (and the library to some extent) still need work, but I hope what's out there is good enough to paint a picture of what this library is about and how it might be useful. All feedback is welcome! I will next work on an example that uses Boost.GIL to construct an image processing dataflow network. Best regards, Stjepan

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[Newbie] Help on thread
by Olivier Tournaire 12 Nov '07

12 Nov '07

Hi all, I would like to know if there is a way to write the same piece of code using threads (one for each shared_ptr creation ) : shared_ptr< Profile > p2 ( new Profile(origine+(double)i*width_sur_nb_fois_wdir,rect->GetHeightDirection(),MPPParameters_.ProfilesNbPoints_,MPPParameters_.ProfilesDistancePoints_ ) ); shared_ptr< Profile > p3 (new Profile(origine+(double)(-i)*width_sur_nb_fois_wdir,rect->GetHeightDirection(),MPPParameters_.ProfilesNbPoints_,MPPParameters_.ProfilesDistancePoints_ ) ); rect_profiles.push_back( p2 ); rect_profiles.push_back( p3 ); Regards -- Le temps des cerises reviendra. Dans l'immédiat, c'est le temps des noyaux. Courage.

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undefined reference to `boost::system::get_system_category()'
by Vivek Nallur 12 Nov '07

12 Nov '07

I just moved to using boost_asio_0_3_8 because of issues with asio_0_3_7's macro redefinition of FD_SETSIZE. Now, there's no issue with compiling the source, however while linking I get an error saying: undefined reference to `boost::system::get_system_category()' I see from the source that classes "posix_error_category" and "system_error_category" are defined in error_code.cpp (boost_asio_0_3_8/libs/system/src), but there's no actual library (*.so or *.a) to link to. I'm including /path/to/boost_asio_0_3_8 while compiling, but am not doing anything for linking, since all of the code (well almost, since error_code is a cpp file) is .hpp What am I doing wrong? Should I be including anything while linking? regs Vivek

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boost program options positional arguments in config file?
by Zachary 12 Nov '07

12 Nov '07

I've been using program_options quite happily and successfully for a short while now and would like to take this opportunity to express my gratitude. Is there a way to extract postional args from config file, though? The headers seem to indicate that it's possible include_positional flag, but I haven't been able to find something workable in the documentation or mailing lists. Thanks, Zak

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Problem with shared version of Boost.Regex library
by ancode tran 12 Nov '07

12 Nov '07

Hi all, I compiled a shared version (DLL) of Boost.Regex on Windows2000 Pro with gcc 3.4.5, mingw 3.13, STLport 5.1.4 and IBM's ICU 3.8. Details are as below: 1. Open file "boost/config/platform/win32.hpp", change the line: #if !defined(__GNUC__) && !defined(BOOST_HAS_DECLSPEC) to: #if (!defined(__GNUC__) || defined(__MINGW32__)) && !defined(BOOST_HAS_DECLSPEC) I did this because mingw (at least with my version) supports both __declspec(dllexport) and __declspec(dllimport), and __GNUC__ is also defined. 2. Open file "boost/regex/user.hpp" and uncomment 2 lines: "#define BOOST_HAS_DLL_RUNTIME 1" and "#define BOOST_REGEX_DYN_LINK 1". 3. Edit file "libs/regex/build/gcc-shared.mak" and then use it to build Boost.Regex from MSYS shell with GNU Make. After the building process completed, I wrote a small program to test the output. It ran nicely but I got the following warning when linking against Boost.Regex: ../../include/boost/regex/pending/static_mutex.hpp:116: warning: 'bool boost::scoped_static_mutex_lock::locked() const' defined locally after being referenced with dllimport linkage It seems my compiler doesn't like to see "inline" and "__declspec(dllimport)" in the same place. So I have some questions: 1. Should I remove "inline" and rebuild Boost.Regex to skip this warning ? 2. Should I continue to use my own shared version of Boost.Regex ? May it result in such thing like undefined behavior, especially in multithread world ? Can anyone give me a hint, please ? Thanks in advance. P.S: STLport and ICU were built as shared libraries, I therefore dont like a static build of Boost.Regex at all. --------------------------------- Thức ăn hữu cơ - thức ăn lành mạnh có lợi cho sức khỏe như thế nào? Khám phá tại Yahoo! Hỏi & Đáp

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Boost::test unknown location(0): fatal error in "...": memory access violation
by Yann Golanski 12 Nov '07

12 Nov '07

I get the following message from one of my test case. Clearly, I have some pointer wrong. Can you tell me how I can generate core files and thus use gdb to find out which pointer is causing the problem? Thanks. -- yann(a)kierun.org -= H+ =- www.kierun.org PGP: 009D 7287 C4A7 FD4F 1680 06E4 F751 7006 9DE2 6318

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linking trouble
by brad 12 Nov '07

12 Nov '07

I am trying to make a package called visual python, but I keep getting this error. I am using fedora 8 and have Linking cvisualmodule.la ... make[1]: *** [cvisualmodule.la] Error 1 make[1]: Leaving directory `/home/brad/Download/visual-4.beta16/src' make: *** [all-recursive] Error 1 The key reason I get this error is this line right here... /usr/bin/ld: cannot find -lboost_thread I looked online saw that I could try --LDFLAGS-L[path], where path is the path to libboost_thread.so and libboost_thread.a. Those files don't exist on my computer and I have boost-1.34.1-5.fc8 and boost-devel-1.34.1-5.fc8. I did however find /usr/lib/libboost_thread-mt.so, /usr/lib/libboost_thread-mt.so.1.34.1, and /usr/lib/libboost_thread-mt.so.3. Brad Longo

4 5

Monitors like Java's Object.wait() / Object.notify() in boost ?
by Yves Dessertine 12 Nov '07

12 Nov '07

Hello, I am a new Boost user (and especialy boost::thread for a school project), I haven't found in Boost a feature like minotors in java, with the methods Object.wait() / Object.notify() / Object.notifyAll(). I have the problem of having one thread that produces information, and several threads that extract infos when available... but all the reader threads needs to be woken up only when more data is available (with an equivalent to nofityAll()). Does such features exists in Boost::thread ??? Thank you for any tip. Have a nice day. Yves Dessertine IT student

3 2

[serialization] portable binary archive first release
by Pfligersdorffer, Christian 12 Nov '07

12 Nov '07

Dear all, I am proud to announce the very first release of our portable_binary_[io]archive which we use here at EOS to move data between different platforms. It really is a conglomerate of pieces that already were there - as is most often the case in oo world - we simply put them together in a way that seemed to make sense. I know a lot of people were interested in portable binary archives, so here you are - give it a try and let me know what you think about it! We rely heavily on boost::serialization and really appreciate the amount of time and knowledge that flew into it. By publishing this small missing piece we hope to contribute our mite to this great library. The work extends the portable binary example which was done by Robert Ramey and uses Beman Dawes' endian library plus the fp_utilities by Johan Rade. You will need to get those two libraries in order to use our classes - look for them at the boost vault (http://www.boost-consulting.com/vault/) in categories 'integer' and 'math - numerics'. Finally you will find the portable binary archive in category 'serialization' as well. Regards, Christian Pfligersdorffer -- christian.pfligersdorffer(a)eos.info http://www.eos.info

1 0

The Calling of Bjam on the Command Line - Problem
by chandra_india＠webdunia.com 12 Nov '07

12 Nov '07

2 1

[Serialization] Compiler warnings from binary_iarchive
by Mahesh Venkitachalam 11 Nov '07

11 Nov '07

Hello, I am getting the compiler warnings below when I include the following in a source file. #include <boost/archive/binary_iarchive.hpp> Everything works fine, but I was wondering if there's any way to get rid of the warnings. I am using boost 1.34.0 on windows XP, and building using Visual Studio 8. Best Regards Mahesh C:\boost_1_34_0\boost/archive/basic_binary_iprimitive.hpp(148) : warning C4996: 'std::basic_streambuf<_Elem,_Traits>::sgetn' was declared deprecated with [ _Elem=char, _Traits=std::char_traits<char> ] C:\Program Files\Microsoft Visual Studio 8\VC\INCLUDE\streambuf(122) : s ee declaration of 'std::basic_streambuf<_Elem,_Traits>::sgetn' with [ _Elem=char, _Traits=std::char_traits<char> ] Message: 'You have used a std:: construct that is not safe. See document ation on how to use the Safe Standard C++ Library' C:\boost_1_34_0\boost/archive/basic_binary_iprimitive.hpp(120) : while c ompiling class template member function 'void boost::archive::basic_binary_iprim itive<Archive,Elem,Tr>::load_binary(void *,size_t)' with [ Archive=boost::archive::binary_iarchive, Elem=char, Tr=std::char_traits<char> ] C:\boost_1_34_0\boost/archive/detail/iserializer.hpp(94) : see reference to function template instantiation 'void boost::archive::basic_binary_iprimitiv e<Archive,Elem,Tr>::load<T>(T &)' being compiled with [ Archive=boost::archive::binary_iarchive, Elem=char, Tr=std::char_traits<char>, T=unsigned char ] C:\boost_1_34_0\boost/archive/detail/iserializer.hpp(348) : see referenc e to function template instantiation 'void boost::archive::load_access::load_pri mitive<Archive,T>(Archive &,T &)' being compiled with [ Archive=boost::archive::binary_iarchive, T=unsigned char ] C:\boost_1_34_0\boost/archive/detail/iserializer.hpp(347) : while compil ing class template member function 'void boost::archive::detail::load_non_pointe r_type<Archive,T>::load_primitive::invoke(Archive &,T &)' with [ Archive=boost::archive::binary_iarchive, T=unsigned char ] C:\boost_1_34_0\boost/archive/detail/iserializer.hpp(423) : see referenc e to class template instantiation 'boost::archive::detail::load_non_pointer_type <Archive,T>::load_primitive' being compiled with [ Archive=boost::archive::binary_iarchive, T=unsigned char ] C:\boost_1_34_0\boost/archive/detail/iserializer.hpp(416) : while compil ing class template member function 'void boost::archive::detail::load_non_pointe r_type<Archive,T>::invoke(Archive &,T &)' with [ Archive=boost::archive::binary_iarchive, T=unsigned char ] C:\boost_1_34_0\boost/archive/detail/iserializer.hpp(570) : see referenc e to class template instantiation 'boost::archive::detail::load_non_pointer_type <Archive,T>' being compiled with [ Archive=boost::archive::binary_iarchive, T=unsigned char ] C:\boost_1_34_0\boost/archive/detail/common_iarchive.hpp(57) : see refer ence to function template instantiation 'void boost::archive::load<Archive,T>(Ar chive &,T &)' being compiled with [ Archive=boost::archive::binary_iarchive, T=unsigned char ] C:\boost_1_34_0\boost/archive/basic_binary_iarchive.hpp(63) : see refere nce to function template instantiation 'void boost::archive::detail::common_iarc hive<Archive>::load_override<T>(T &,int)' being compiled with [ Archive=boost::archive::binary_iarchive, T=unsigned char ] C:\boost_1_34_0\boost/archive/binary_iarchive_impl.hpp(45) : see referen ce to function template instantiation 'void boost::archive::basic_binary_iarchiv e<Archive>::load_override<T>(T &,int)' being compiled with [ Archive=boost::archive::binary_iarchive, T=unsigned char ] C:\boost_1_34_0\boost/archive/detail/interface_iarchive.hpp(77) : see re ference to function template instantiation 'void boost::archive::binary_iarchive _impl<Archive,Elem,Tr>::load_override<T>(T &,int)' being compiled with [ Archive=boost::archive::binary_iarchive, Elem=char, Tr=std::char_traits<char>, T=unsigned char ] C:\boost_1_34_0\boost/archive/basic_binary_iarchive.hpp(73) : see refere nce to function template instantiation 'Archive &boost::archive::detail::interfa ce_iarchive<Archive>::operator >><unsigned char>(T &)' being compiled with [ Archive=boost::archive::binary_iarchive, T=unsigned char ] C:\boost_1_34_0\boost/archive/basic_binary_iarchive.hpp(70) : while comp iling class template member function 'void boost::archive::basic_binary_iarchive <Archive>::load_override(boost::archive::version_type &,int)' with [ Archive=boost::archive::binary_iarchive ] C:\boost_1_34_0\boost/archive/binary_iarchive_impl.hpp(31) : see referen ce to class template instantiation 'boost::archive::basic_binary_iarchive<Archiv e>' being compiled with [ Archive=boost::archive::binary_iarchive ] C:\boost_1_34_0\boost/archive/binary_iarchive.hpp(34) : see reference to class template instantiation 'boost::archive::binary_iarchive_impl<Archive,Elem ,Tr>' being compiled with [ Archive=boost::archive::binary_iarchive, Elem=char, Tr=std::char_traits<char> ] C:\boost_1_34_0\boost/archive/basic_binary_iprimitive.hpp(159) : warning C4996: 'std::basic_streambuf<_Elem,_Traits>::sgetn' was declared deprecated with [ _Elem=char, _Traits=std::char_traits<char> ] C:\Program Files\Microsoft Visual Studio 8\VC\INCLUDE\streambuf(122) : s ee declaration of 'std::basic_streambuf<_Elem,_Traits>::sgetn' with [ _Elem=char, _Traits=std::char_traits<char> ] Message: 'You have used a std:: construct that is not safe. See document ation on how to use the Safe Standard C++ Library'

1 0

Boost serialization: Problem reading strings from binary archive
by Mahesh Venkitachalam 11 Nov '07

11 Nov '07

Hello, I am having a strange problem with std::string as I am trying to read from a binary archive using Boost serialization. I am new to this, and it is possible that I have not understood the usage. In the code below, the string "faultblock" seems to be causing the problem. The code crashes in the ia & tst line which is reading back the archive - the stack indicates that it is trying to read an invalid string. I have tried to minimize the code I need to post, but sorry if this is still too much. I'd appreciate any help with this. I am using Boost 1.34.0 on windows XP. Best Regards Mahesh // // test.cpp // #include <iomanip> #include <iostream> #include <fstream> #include <string> #include <vector> #include <boost/archive/text_iarchive .hpp> #include <boost/archive/text_oarchive.hpp #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_iarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/list.hpp> #include "Attribute4dv.h" using namespace std; class Test { private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar.template register_type<AttrDouble4dv>(); ar.template register_type<AttrString4dv>(); ar & _attrs; } public: vector<Attribute4dv*> _attrs; Test() {} ~Test() {} }; int main(int argc, char* arv[]) { // save data to archive { Test* tst = new Test; vector<double> dVals; dVals.push_back(1.1); dVals.push_back(2.2); AttrDouble4dv* attr1 = new AttrDouble4dv; attr1->_name = "attr1"; attr1->_vals = dVals; tst->_attrs.push_back(attr1); vector<string> lut; lut.push_back("2001"); lut.push_back("2002"); vector<int> lutIndices; lutIndices.push_back (0); lutIndices.push_back(1); AttrString4dv* attr2 = new AttrString4dv; attr2->_name = "faultblock"; attr2->_indices = lutIndices; attr2->_lut = lut; tst->_attrs.push_back(attr2); const Test* tst2 = tst; std::ofstream ofs("test.bin"); boost::archive::binary_oarchive oa(ofs); oa & tst2; } // read data from archive { Test* tst; std::ifstream ifs("test.bin", std::ios::binary); boost::archive::binary_iarchive ia(ifs); ia & tst; int j = 0; } return 0; } // // Attribute4dv.h // #ifndef _ATTRIBUTE4DV_H #define _ATTRIBUTE4DV_H #include <vector> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/vector.hpp> // Base class class Attribute4dv { public: Attribute4dv() {} virtual ~Attribute4dv() {} // name of attribute std::string _name; private: // for serialization friend class boost::serialization::access; template<class Archive> void serialize(Archive &ar, const unsigned int version) { ar & _name; } }; // double attributes class AttrDouble4dv : public Attribute4dv { public: AttrDouble4dv() {} ~AttrDouble4dv() {} std::vector<double> _vals; private: // for serialization friend class boost::serialization::access; template<class Archive> void serialize(Archive &ar, const unsigned int version) { // save/load base class info ar & boost::serialization::base_object<Attribute4dv>(*this); ar & _vals; } }; // string attributes class AttrString4dv : public Attribute4dv { public: AttrString4dv() {} ~AttrString4dv() {} // a lookup table (LUT) of strings std::vector<std::string> _lut; // indices to the LUT std::vector<int> _indices; private: // for serialization friend class boost::serialization::access; template<class Archive> void serialize(Archive &ar, const unsigned int version) { // save/load base class info ar & boost::serialization::base_object<Attribute4dv>(*this); ar & _lut; ar & _indices; } }; #endif // _ATTRIBUTE4DV_H

2 2

[Date_Time]: efficient use, fuzzy formats and a valgrind error
by Christoph 10 Nov '07

10 Nov '07

I today made first (hands on) contact with the Boost.Date_Time library and it really is quite intuitive to use and I'd like to see if it fits our needs. I want to replace some rather heavily used C functions with something Boost.Date_Time based as the old code is rather ugly and unintellegible whereas the Boost lib is tested, well documented and so on. i) As I have mentioned before, one important aspect is efficient parsing of dates. Our old function is configurable through format strings. Is the following code (esp. the function parse_date) efficient? #define ID_INP_NORMDAT "%d.%m.%Y" static MDATUM date_to_mdatum(const date &d); static MDATUM parse_date(const char * const sDate, const char * const sFormat) { string s(sDate); // stringstream needs a std::string? stringstream ss(s); date_input_facet* facet(new date_input_facet(sFormat)); // expensive? ss.imbue(locale(ss.getloc(), facet)); date d; ss >> d; // yes, I need to do error checking here // I need to produce our internal date format again return date_to_mdatum(d); } What I wonder are: * Esp. (as I am new to facets and imbueing etc as well): is the construction of facets etc expensive? * I need to support some twenty input/output formats. Should I construct (and cache) facets in advance, or is it ok to construct these every time they are needed? * valgrind tells me I do not have a memory leak. Who owns facets? * Do I have to unimbue a stream (assuming I had imbued cout)? * Can I avoid constructing the std::string? It would be great if you could point out flaws and inefficiencies (or just best practices in this case) in the above code to me. I'd like to say in advance thanks for looking into this. ii) 'Fuzzy formats' I need to allow the user some degree of freedom (lazyness) when entering dates. It is required that (German dates) 01.10.2007 01102007 011007 (and more) all produce the same date (Oct 1st 2007). Is this possible with Boost.Date_Time's format strings? (I don't think so.) Is there a(n efficient) way to achieve that (ideally not trying the different possible formats one by one ;-) iii) When I ran the attached program through valgrind (with options --tool=memcheck --leak-check=full -v) I got the following error report: ==7762== Conditional jump or move depends on uninitialised value(s) ==7762== at 0xC9FAC99: strftime_l (in /lib64/libc-2.6.1.so) ==7762== by 0xC2C63DB: std::__timepunct<char>::_M_put(char*, unsigned long, char const*, tm const*) const (in /usr/lib64/libstdc++.so.6.0.9) ==7762== by 0xC2874DE: std::time_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::do_put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, tm const*, char, char) const (in /usr/lib64/libstdc++.so.6.0.9) ==7762== by 0xC285A7F: std::time_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, tm const*, char const*, char const*) const (in /usr/lib64/libstdc++.so.6.0.9) ==7762== by 0x40CFBD: std::vector<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > boost::date_time::gather_month_strings<char>(std::locale const&, bool) (strings_from_facet.hpp:57) ==7762== by 0x40E991: boost::date_time::format_date_parser<boost::gregorian::date, char>::format_date_parser(std::string const&, std::locale const&) (format_date_parser.hpp:175) ==7762== by 0x40F6DC: boost::date_time::date_input_facet<boost::gregorian::date, char, std::istreambuf_iterator<char, std::char_traits<char> > >::date_input_facet(std::string const&, unsigned long) (date_facet.hpp:474) ==7762== by 0x409539: parse_date(char const*, char const*) (datum_test.cpp:29) ==7762== by 0x40976C: main (datum_test.cpp:40) --7762-- REDIR: 0xC9E1C70 (index) redirected to 0x4C22A20 (index) Just in case I am doing something wrong here. Am I? Thank you for producing a great library and best regards Christoph

2 1

Copy from stream to vector
by Ricardo Mayerhofer 10 Nov '07

10 Nov '07

Hi all, I've started to use boost 1 month ago and I'm findind it very helpful indeed. Congratulations for the good job. I have one question, is it possible to use boost to copy from a stream to a container? If so, how do I? eg. with std copy: copy( istream_iterator<string>(FileSource), istream_iterator<FileSource> (), back_inserter( m_StringVector ) ) I wonder if boost copy would make it simpler, but I was not able to use it. It pops up a static assertion failure :( Any help? Thanks. Ricardo

5 10

Re: [Boost-users] [asio] Problems with Boost.System
by Damjan Miklic 10 Nov '07

10 Nov '07

I have solved my problem by downloading the latest version of Boost from the subversion repository. With this version, i could build the System library and link the Asio Timer examples. I was wondering whether this is the recommended solution and whether the System library is officially a part of Boost 1.34.1, as there is no information on it in the online docs http://www.boost.org/libs/libraries.htm Best regards, Damjan Miklic Damjan Miklic wrote: > Thaks for the quick reply. Unfortunately i still can't compile the > system library. My default installation doesn't even have a > > libs\system > > folder. I have downloaded system-0.2.1.zip from the boost vault and > copied the 'system' folder to > > boost_1_34_1\libs > > but running > > bjam --toolset=msvc --with-system > > results with the same error: > > wrong library name 'system' in the --with-<library> option. > > Running bjam in > > boost\libs\system\build > > gives a lengthy error message and doesn't seem to build anything. > > Further assistance would be appreciated. > > Best regards, > > Damjan Miklic > > > Simon Pickles wrote: >> Hi, I had this problem recently. >> >> I had to abandon the stage argument and just use: >> >> bjam --toolset=msvc --with-system >> >> or alternatively, just build the system part by running bjam in: >> >> boost\libs\system\build >> >> like this: >> >> bjam --toolset=msvc threading=multi link=static >> >> >> Good luck! >> >> Simon >> >> >> >> Damjan Miklic wrote: >>> Hi, >>> >>> I am running into some problems when trying to build a simple >>> Asio program (the Timer2 tutorial) with MSVC 8.0. I have >>> installed Boost using the installer from Boost Consulting and >>> copied the Asio headers to the boost_1_34_1\boost directory. The >>> program compiles (with three warnings about deprecated unsafe >>> functions in asio headers) but linking fails with the error: >>> >>> fatal error LNK1104: cannot open file >>> 'libboost_system-vc80-mt-sgd-1_34_1.lib' >>> >>> I have tried building Boost.System with the command: >>> >>> bjam --with-system stage >>> >>> according to the instructions found on: >>> >>> http://asio.sourceforge.net/boost_asio_0_3_8/libs/asio/doc/html/boost_asio/… >>> >>> >>> >>> but i get the following error: error: wrong library name 'system' >>> in the --with-<library> option. >>> >>> I have searched the Boost website and mailing list archives but >>> couldn't find any further information on building the System >>> library. >>> >>> Any help in resolving this problem will be greatly appreciated. >>> >>> Best Regards, >>> >>> Damjan Miklic >>>

1 0

copy(unit_vector.begin(), unit_vector.end(), vector.begin())
by e r 10 Nov '07

10 Nov '07

hi all, i'm trying to assign a unit vector into a vector. i get puzzling results: v[3](0,0,0)//initial uv1[3](1,0,0) v[3](1,0,0) uv2[3](0,1,0) v[3](1,0,0)//should be (0,1,0) uv3[3](0,1,0) v[3](1,0,0)//should be (0,0,1) for the code below. i must be missing something obvious...what is it? #include <boost/numeric/ublas/vector.hpp> #include <boost/numeric/ublas/io.hpp> int main(){ using namespace boost::numeric::ublas; unsigned int D = 3; unit_vector<unsigned int> uv1(D,0); unit_vector<unsigned int> uv2(D,1); unit_vector<unsigned int> uv3(D,2); vector<unsigned int> v(D); std::cout << "v" << v << std::endl; copy(uv1.begin(),uv1.end(),v.begin()); std::cout << "uv1" << uv1 << std::endl; std::cout << "v" << v << std::endl; copy(uv2.begin(),uv2.end(),v.begin()); std::cout << "uv2" << uv2 << std::endl; std::cout << "v" << v << std::endl; copy(uv3.begin(),uv3.end(),v.begin()); std::cout << "uv3" << uv2 << std::endl; std::cout << "v" << v << std::endl; return 0; };

1 0

link error using boost serialization library
by Y Fang 10 Nov '07

10 Nov '07

Hi, I am trying to use boost serialization library, but run into link errors that I don't know how to resolve. I created a very simple data structure with a 'string' and 'int' in it. Then I try to serialize it to a stringstream and recover from a stringstream. The compile failed during linking. The first few errors are: % make g++ -O0 -g3 -Wall -D_REENTRANT -pthread -lboost_program_options -lboost_filesystem -lboost_iostreams -lboost_thread -lboost_regex -lboost_serialization -lpthread -o a.out main.o SimpleData.o main.o: In function `boost::archive::text_oarchive& boost::smart_cast_impl::reference<boost::archive::text_oarchive&>::polymorphic::cross::cast<boost::archive::detail::basic_oarchive>(boost::archive::detail::basic_oarchive&)': /usr/include/boost/smart_cast.hpp:76: undefined reference to `typeinfo for boost::archive::detail::basic_oarchive' main.o: In function `void boost::archive::save_access::save_primitive<boost::archive::text_oarchive, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >(boost::archive::text_oarchive&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)': /usr/include/boost/archive/detail/oserializer.hpp:91: undefined reference to `boost::archive::detail::basic_oarchive::end_preamble()' /usr/include/boost/archive/detail/oserializer.hpp:92: undefined reference to `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::save(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)' main.o: In function `void boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::save<int>(int const&)': /usr/include/boost/archive/text_oarchive.hpp:53: undefined reference to `boost::archive::basic_text_oarchive<boost::archive::text_oarchive>::newtoken()' main.o: In function `void boost::archive::save_access::save_primitive<boost::archive::text_oarchive, int>(boost::archive::text_oarchive&, int const&)': /usr/include/boost/archive/detail/oserializer.hpp:91: undefined reference to `boost::archive::detail::basic_oarchive::end_preamble()' main.o: In function `void boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::save<boost::archive::class_id_reference_type>(boost::archive::class_id_reference_type const&)': /usr/include/boost/archive/text_oarchive.hpp:53: undefined reference to `boost::archive::basic_text_oarchive<boost::archive::text_oarchive>::newtoken()' ...... I attached the source code of the 4 files I use: main.cpp, SimpleData.h, SimpleData.cpp, and Serialize.cpp. Also, here is the g++ version I use: % g++ -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --enable-checking=release i486-linux-gnu Thread model: posix gcc version 4.1.2 (Ubuntu 4.1.2-0ubuntu4) Is there something I missed in the include list? I tried '#include <boost/archive/detail/basic_oarchive.hpp>' in Serialize.h file, that would trigue compile error even before linking. Thanks, Yu main.cpp: #include <string> #include <iostream> #include "SimpleData.h" #include "Serialize.h" int main () { // test serialization of data structure SimpleData sd("hello", 1); std::string sdstr = saveData<SimpleData>(sd); std::cout << "Serialized simple data is:\n" << sdstr << std::endl; return 0; } SimpleData.h: #ifndef SIMPLEDATA_H_ #define SIMPLEDATA_H_ #include <string> class SimpleData { public: SimpleData(); SimpleData(std::string id_, int code_); virtual ~SimpleData(); std::string id; int code; }; #endif /*SIMPLEDATA_H_*/ SimpleData.cpp: #include "SimpleData.h" SimpleData::SimpleData () { id = "default"; code = 0; return; } SimpleData::SimpleData (std::string id_, int code_) : id(id_), code(code_) { return; } SimpleData::~SimpleData () { return; } Serialize.h: #ifndef SERIALIZE_H_ #define SERIALIZE_H_ #include <sstream> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/string.hpp> #include "SimpleData.h" namespace boost { namespace serialization { // add a serialize function below for each data structure that needs // to be serialized // serialize simple data template<class Archive> void serialize (Archive & _ar, SimpleData & _sd, const unsigned int _version) { _ar & _sd.id; _ar & _sd.code; } } } // serialize data structure and save into a string // note: there must be a serialize function defined // above for the data structure template<class Data> std::string saveData (const Data& _d) { std::ostringstream oss; boost::archive::text_oarchive oa(oss); oa << _d; return oss.str(); } // deserialize and recover data structure from a string template<class Data> Data loadData (const std::string& _s) { std::istringstream iss(_s); boost::archive::text_iarchive ia(iss); Data d; ia >> d; return d; } #endif /*SERIALIZE_H_*/

1 0

[date_time] absolute value for time_duration?
by Michael Fawcett 09 Nov '07

09 Nov '07

What is the best way to ensure that one has a positive time_duration? I'm dealing with hundreds of thousands of data points and need to gather the points that are temporally near a given time (based on a duration). For example, find all points in the collection that are within 1 hour of Feb 2, 5:00pm. I used the following code to verify that simply multiplying by -1 would give the desired result, but it would probably be nicer to provide a std::abs overload. boost::posix_time::ptime lhs1(boost::gregorian::date(2007, 2, 1), boost::posix_time::hours(1)); boost::posix_time::ptime rhs1(boost::gregorian::date(2007, 2, 2), boost::posix_time::hours(1)); boost::posix_time::time_duration elapsed1 = lhs1 - rhs1; elapsed1 *= -1; boost::posix_time::ptime lhs2(boost::gregorian::date(2007, 2, 2), boost::posix_time::hours(1)); boost::posix_time::ptime rhs2(boost::gregorian::date(2007, 2, 1), boost::posix_time::hours(1)); boost::posix_time::time_duration elapsed2 = lhs2 - rhs2; assert(elapsed1 == elapsed2); and the actual code is something like (where duration would be 1 hour in this example): boost::posix_time::time_duration elapsed = pt.timestamp - rhs.timestamp; if (elapsed.is_negative()) elapsed *= -1; return elapsed <= duration; I realize that one could also use std::max and std::min, but that seems a bit inefficient, especially since this is a very performance critical area of our application. Thanks, --Michael Fawcett

2 2

Derive from adjacency_list
by Olivier Tournaire 09 Nov '07

09 Nov '07

Hi all, I want to derive a class from adjacency_list : template <class NodesContainer = boost::vecS, class EdgesContainer = boost::vecS, class Directed = boost::undirectedS, class NodesAttributes = boost::no_property, class EdgesAttributes = boost::no_property > class BGL_Graph : public boost::adjacency_list<NodesContainer, EdgesContainer, Directed, NodesAttributes, EdgesAttributes > { /// ... many typedefs /// ... }; I also have an other derived class from BGL_Graph : class MPPRectangleGraph : public BGL_Graph<boost::vecS,boost::vecS,boost::undirectedS,MPPRectangleGraphNode,Weight> { public: MPPRectangleGraph() {is_init_ = false;}; ~MPPRectangleGraph(); void InitDisplay(std::string name = "MPP", unsigned int width = 200, unsigned int height = 200); void Draw( unsigned int flags = DRAW_NOTHING); void Display( unsigned int flags = DRAW_NOTHING ); protected: private: bool is_init_; IdFenetreCalques window_; IdCalqueVecteur layer_rectangle_; IdCalqueVecteur layer_profiles_; IdCalqueVecteur layer_neighborhood_; IdCalqueVecteur layer_edges_; }; My problem is how can I iterate on the edges in a method of MPPRectangleGraph ? void MPPRectangleGraph::Draw( unsigned int flags ) { // On recupere les differents flags d'affichage bool draw_rect = false, draw_profiles = false, draw_neighborhood = false, draw_edges = false; if ( flags&DRAW_RECTANGLE ) draw_rect = true; if ( flags&DRAW_PROFILES ) draw_profiles = true; if ( flags&DRAW_NEIGHBORHOOD ) draw_neighborhood = true; if ( flags&DRAW_EDGES ) draw_edges = true; // On vide tous les calques layer_rectangle_.Clear(); layer_profiles_.Clear(); layer_neighborhood_.Clear(); layer_edges_.Clear(); // On fait l'affichage en fonction des flags recuperes // Les aretes MPPRectangleGraph::edge_iterator first, last; for(boost::tie(first, last)=edges(this);first!=last;++first) // does not work ! { //std::cout << boost::source(*first, g) << " to " << boost::target(*first, g) << " = "; } } Regards -- Le temps des cerises reviendra. Dans l'immédiat, c'est le temps des noyaux. Courage.

1 1

Invoke Bjam on the Command Line
by chandra_india＠webdunia.com 09 Nov '07

09 Nov '07

2 1

macro redefinition errors
by Vivek Nallur 09 Nov '07

09 Nov '07

Hi, My project uses boost 1.34.1 libraries for asio and also includes windows.h (which in turn includes winsock.h). This results in a macro redefinition error for FD_SETSIZE and then goes on to spew a bucketload of related errors. The easiest way to reproduce this is to have a simple main.cpp with just: #include<boost/asio.hpp> #include<windows.h> int main() { return 0; } Any ideas on what I'm doing wrong? Or what I could try? I've tried defining WIN32_LEAN_AND_MEAN, IPPROTO_V6 in the makefile, but to no avail. I'm using VC 8 on a windows XP. ======================== My comand line looks like this: C:\perforce\some\path\>make main.o -- Compile main.cpp... c:/perforce/toolchain/win32/winsdk-6.1.6000/VC/bin/cl.exe -nologo -Fdc:/perforce/some/path somelib.pdb -Gm -EHsc -c -Zi -TP -GR -D_WIN32 -D_USRDLL -D_WIN32_WINNT -DWINVER=0x0600 -D_WINDLL -D_MBCS -W3 -D_CRT_NO NSTDC_NO_DEPRECATE -D_CRT_SECURE_NO_WARNINGS -DUSERLEVEL -MDd -Od -D_DEBUG -RTC1 -I"C:\perforce\toolchain\win32\boost-1.34.1\include" -Ic:/perforce/toolchain/win32/winsdk-6.1.6000/Include -Ic:/perforce/toolchain/win32/winsdk-6.1.6000/VC/include -Ic:/perforce/toolchain/win32/winsdk-6.1.6000/VC/PlatformSDK/Include And the error message looks like: C:\perforce\toolchain\win32\boost-1.34.1\include\boost/asio/detail/socket_types.hpp(44) : warning C4005: 'FD_SETSIZE' : macro redefinition c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\winsock.h(65) : see previous definition of 'FD_SETSIZE' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(91) : warning C4005: 'AF_IPX' : macro redefinition c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\winsock.h(460) : see previous definition of 'AF_IPX' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(116) : warning C4005: 'AF_MAX' : macro redefinition c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\winsock.h(479) : see previous definition of 'AF_MAX' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(163) : warning C4005: 'SO_DONTLINGER' : macro redefinition c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\winsock.h(402) : see previous definition of 'SO_DONTLINGER' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(206) : error C2011: 'sockaddr' : 'struct' type redefinition c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\winsock.h(485) : see declaration of 'sockaddr' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(384) : error C2143: syntax error : missing '}' before 'constant' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(437) : error C2143: syntax error : missing ';' before '}' c:\perforce\toolchain\win32\winsdk-6.1.6000\Include\ws2def.h(437) :error C4430: missing type specifier - int assumed. Note: C++ does not support default-int ========================

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Re: [Boost-users] [bind] binding templated operator with vs 7.1
by Stjepan Rajko 09 Nov '07

09 Nov '07

On Nov 8, 2007 4:20 PM, MOSS Sebastian <Sebastian.MOSS(a)murex.com> wrote: > Hi, > > I'm having trouble with the following design with vs 7.1 and wondering if anyone could offer a workaround. > > Particularly it seems that the ".template operator" syntax isn't liked. (This works on gcc 4.0.3). Removing the > 'template' keyword from the bind arguments gives an error novel. > I was having a similar issue with msvc8. Not sure what the underlying problem is but I ended up just using the template keyword conditionally for non-MSVC compilers. I.e., something like #include <boost/config.hpp> ... boost::bind(&bound:: #ifndef BOOST_MSVC template #endif operator&<T>, instance, obj); It would probably be cleaner to define something like TEMPLATE_OPERATOR to template for non-msvc and to nothing for msvc, and use that instead. Maybe something like that is already defined somewhere. HTH, Stjepan

2 1

[Boost Users] Serialization -- serializing a map with shared_ptr values
by Oliver Kania 09 Nov '07

09 Nov '07

I have the following two data structures: std::map<const std::string, boost::shared_ptr< C >, jedox::util::CaseInsensitiv > m_LookupName; std::map<unsigned int, boost::shared_ptr< C > > m_LookupId; Before serialization, the shared pointer - values of the maps do point to sth. meaningful. Afterwards, however, they point to data-structures with meaningless content. The keys (strings / ints) are serialized / unserialized correctly. I guess its a general problem with serializing shared pointers contained in a std::map as values !? BTW: the structures the shared pointers point to do have a serialization method themselves and I a assume that it is called when serializing the map. I serialize / unserialize as follows: template<class Archive> void save( Archive &ar, unsigned int version) const{ m_offlineMode = true; bool oldCachedAll = m_CachedAll; m_CachedAll = true; ar & m_CachedAll; ar & m_offlineMode; // do not serialize the lock -- use the default constructor. // we assume that no iterators that lock the cache do exist when serializing. // ar & m_Lock; ar & m_LookupId; // 1st structure ar & m_LookupName; // 2nd structure ar & m_SequenceNumber; //reset old state for the case we want to continue working m_CachedAll = oldCachedAll; m_offlineMode = false; } template<class Archive> void load( Archive &ar, unsigned int version) { ar & m_CachedAll; ar & m_offlineMode; // do not serialize the lock -- use the default constructor. // we assume that no iterators that lock the cache do exist when serializing. // ar & m_Lock; ar & m_LookupId; ar & m_LookupName; ar & m_SequenceNumber; //reset old state for the case we want to continue working } kind regards, Oliver

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Re: [Boost-users] Something simple is wrong I am sure
by Daniel Lord 09 Nov '07

09 Nov '07

> > Daniel Lord wrote: > > >> So how can this be? The build was for Darwin and yet its the wrong > > >> architecture?!?!?! > > >> > > >> I don't understand the error messages frankly. > > > Me neither: but after a quick bit of Googling this appears to be a > common problem if you mix "universal" and "non-universal" binaries. So my > guess is > > that the Boost libraries and your executable were built with different > > architechture options: one universal one not. But I can't tell you which > is > > which ! :-) > > Sure enough none of the libraries are universal binaries and only the dynamic libraries are for the i386 architecture (see lipo output below). $lipo -detailed_info libboost_regex* input file libboost_regex-1_34_1.a is not a fat file input file libboost_regex-1_34_1.dylib is not a fat file input file libboost_regex-d-1_34_1.a is not a fat file input file libboost_regex-d-1_34_1.dylib is not a fat file input file libboost_regex-d.a is not a fat file input file libboost_regex-mt-1_34_1.a is not a fat file input file libboost_regex-mt-1_34_1.dylib is not a fat file input file libboost_regex-mt-d-1_34_1.a is not a fat file input file libboost_regex-mt-d-1_34_1.dylib is not a fat file input file libboost_regex-mt-d.a is not a fat file input file libboost_regex-mt.a is not a fat file input file libboost_regex.a is not a fat file Non-fat file: libboost_regex-1_34_1.a is architecture: ppc7400 Non-fat file: libboost_regex-1_34_1.dylib is architecture: i386 Non-fat file: libboost_regex-d-1_34_1.a is architecture: ppc7400 Non-fat file: libboost_regex-d-1_34_1.dylib is architecture: i386 Non-fat file: libboost_regex-d.a is architecture: ppc7400 Non-fat file: libboost_regex-mt-1_34_1.a is architecture: ppc7400 Non-fat file: libboost_regex-mt-1_34_1.dylib is architecture: i386 Non-fat file: libboost_regex-mt-d-1_34_1.a is architecture: ppc7400 Non-fat file: libboost_regex-mt-d-1_34_1.dylib is architecture: i386 Non-fat file: libboost_regex-mt-d.a is architecture: ppc7400 Non-fat file: libboost_regex-mt.a is architecture: ppc7400 Non-fat file: libboost_regex.a is architecture: ppc7400 I made the assumption that Boost would, as a default, build for the native architecture it was building one since most of the other libraries I use have been doing that for nearly 2 years. My mistake. It is building universal binaries that usually requiring customization of the build. But to build ppc on an intel platform--that was completely unexpected at this late date. Searching the Boost site for the key word "universal binaries" found nothing. Searching for "universal OS X" gave four generic uses of the word "universal" but nothing of help. Anybody have any experience building Boost as a universal library set? If not... It's been over a year since I had to hack a build so I need to refresh my memory. It my well be time to pour another cup of java, take the red pill, and see how deep the rabbiit hole goes.

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Re: [Boost-users] [asio] Problems with Boost.System
by Damjan Miklic 09 Nov '07

09 Nov '07

Thaks for the quick reply. Unfortunately i still can't compile the system library. My default installation doesn't even have a libs\system folder. I have downloaded system-0.2.1.zip from the boost vault and copied the 'system' folder to boost_1_34_1\libs but running bjam --toolset=msvc --with-system results with the same error: wrong library name 'system' in the --with-<library> option. Running bjam in boost\libs\system\build gives a lengthy error message and doesn't seem to build anything. Further assistance would be appreciated. Best regards, Damjan Miklic Simon Pickles wrote: > Hi, I had this problem recently. > > I had to abandon the stage argument and just use: > > bjam --toolset=msvc --with-system > > or alternatively, just build the system part by running bjam in: > > boost\libs\system\build > > like this: > > bjam --toolset=msvc threading=multi link=static > > > Good luck! > > Simon > > > > Damjan Miklic wrote: >> Hi, >> >> I am running into some problems when trying to build a simple Asio >> program (the Timer2 tutorial) with MSVC 8.0. I have installed Boost >> using the installer from Boost Consulting and copied the Asio headers to >> the boost_1_34_1\boost directory. The program compiles (with three >> warnings about deprecated unsafe functions in asio headers) but linking >> fails with the error: >> >> fatal error LNK1104: cannot open file >> 'libboost_system-vc80-mt-sgd-1_34_1.lib' >> >> I have tried building Boost.System with the command: >> >> bjam --with-system stage >> >> according to the instructions found on: >> >> http://asio.sourceforge.net/boost_asio_0_3_8/libs/asio/doc/html/boost_asio/… >> >> but i get the following error: >> error: wrong library name 'system' in the --with-<library> option. >> >> I have searched the Boost website and mailing list archives but couldn't >> find any further information on building the System library. >> >> Any help in resolving this problem will be greatly appreciated. >> >> Best Regards, >> >> Damjan Miklic >>

1 0

Something simple is wrong I am sure
by Daniel Lord 09 Nov '07

09 Nov '07

OS X 10.5 Macbook Pro (Intel Dual Core x86) Boost builds and installs fine (except for Unicode Regex) and recognizes the toolset is Darwin. $./configure -n Building Boost.Jam with toolset darwin... tools/jam/src/bin.macosxx86/bjam -n Detecting Python version... 2.5 -n Detecting Python root... /Library/Frameworks/Python.framework/Versions/2.5 -n Unicode/ICU support for Boost.Regex?... not found. Backing up existing Boost.Build configuration in user-config.jam.4 Generating Boost.Build configuration in user-config.jam... Generating Makefile... and make and install proceeded fine. So I tried the examples on the "Getting Started Page" First one works fine. Second one (using the regex libraries does not): "ld: warning in /usr/local/lib/libboost_regex-mt-d.a, file is not of required architecture Undefined symbols: "boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >::maybe_assign(boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > > const&)", referenced from: boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::basic_string<cha" So how can this be? The build was for Darwin and yet its the wrong architecture?!?!?! I don't understand the error messages frankly.

2 1

Re: [Boost-users] shared_ptr and covariant return types
by lists.boost.org＠xmlizer.biz 09 Nov '07

09 Nov '07

Hi Ovanes Thanks for your reply. Yes, I understand that do_clone is private. I wonder what Peter Dimov's idea is. I believe the point of this free function would be that you would only need to write it once and use it for any class that provides the do_clone() method. Which I'd love to see in action. Or be proven wrong. Thanks Bernhard On Thu, 8 Nov 2007, Ovanes Markarian wrote: > Hi! > > do_clone is really private ;) Your derived class has public clone > member and you should use it from the free function, but no the > do_clone. > > > Regards, > Ovanes > > > > On 8 Nov 2007 14:53:49 +0100, Bernhard Wagner boost > <lists.boost.org(a)xmlizer.biz> wrote: > In this post Peter Dimov shows a solution for the covariant return type > problem when using shared_ptr: > http://lists.boost.org/boost-users/2003/02/2996.php > > I'm interested in the free function solution he provides: > > > [snip] you can use the usual pattern from the no-covariant-return > days: > > > > class B > > { > > virtual shared_ptr<B> do_clone() const = 0; > > }; > > > > class X: public B > > { > > virtual shared_ptr<B> do_clone() const { return shared_ptr<X>(new > > X(*this)); } > > > > public: > > > > shared_ptr<X> clone() const > > { > > shared_ptr<X> px = dynamic_pointer_cast<X>(this->do_clone()); > > assert(px); > > return px; > > } > > }; > > > > It buys you some extra safety, too. > > > > You could also use a free function: > > > > template<class X> shared_ptr<X> clone(X const & x) > > { > > > > shared_ptr<X> px = dynamic_pointer_cast<X>( x.do_clone()); > > assert(px); > > return px; > > } > > > > So, to clone an object using the clone method, I could use: > > X* x; > shared_ptr<X> spX(x = new X()); > shared_ptr<X> spX2 = spX->clone(); > // or: > shared_ptr<X> spX3 = x->clone(); > > But how is the free function meant to be used? > > This provokes the compiler error: '... do_clone() const is private ...': > shared_ptr<X> spX4 = clone(*spX); > > Thank you > Bernhard > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > -- Bernhard Wagner bernhard.wagner(a)iaeth.ch Milchbuckstr. 14 VOICE +41-1-364 50 03 CH-8057 Zurich, Switzerland http://listen.to/bernard

1 0

[bind] binding templated operator with vs 7.1
by MOSS Sebastian 08 Nov '07

08 Nov '07

Hi, I'm having trouble with the following design with vs 7.1 and wondering if anyone could offer a workaround. Particularly it seems that the ".template operator" syntax isn't liked. (This works on gcc 4.0.3). Removing the 'template' keyword from the bind arguments gives an error novel. Any ideas would be warmly welcomed! s #include <boost/bind.hpp> #include <boost/function.hpp> #include <iostream> class tmpl_operator { public: template <typename T> void operator&( const T& rhs ) const { // do stuff std::cout << rhs; } }; template <class T, class bound> class command { public: command( T& obj, bound& instance ) : _instance(instance) { // works with gcc (4.0.3) but not cl (7.1): apply = boost::bind(&bound::template operator&<T>, instance, obj); // doesn't compile in vs: //_instance.template operator&<T>(obj); // this compiles in vs though: // _instance.operator&<T>(obj); } void execute() { apply(); } private: bound _instance; boost::function<void (void)> apply; }; int main() { double dbl = 2.71; tmpl_operator instance; command<double,tmpl_operator> test(dbl,instance); test.execute(); } ******************************* This e-mail contains information for the intended recipient only. It may contain proprietary material or confidential information. If you are not the intended recipient you are not authorised to distribute, copy or use this e-mail or any attachment to it. Murex cannot guarantee that it is virus free and accepts no responsibility for any loss or damage arising from its use. If you have received this e-mail in error please notify immediately the sender and delete the original email received, any attachments and all copies from your system.

1 0

[asio] Problems with Boost.System
by Damjan Miklic 08 Nov '07

08 Nov '07

Hi, I am running into some problems when trying to build a simple Asio program (the Timer2 tutorial) with MSVC 8.0. I have installed Boost using the installer from Boost Consulting and copied the Asio headers to the boost_1_34_1\boost directory. The program compiles (with three warnings about deprecated unsafe functions in asio headers) but linking fails with the error: fatal error LNK1104: cannot open file 'libboost_system-vc80-mt-sgd-1_34_1.lib' I have tried building Boost.System with the command: bjam --with-system stage according to the instructions found on: http://asio.sourceforge.net/boost_asio_0_3_8/libs/asio/doc/html/boost_asio/… but i get the following error: error: wrong library name 'system' in the --with-<library> option. I have searched the Boost website and mailing list archives but couldn't find any further information on building the System library. Any help in resolving this problem will be greatly appreciated. Best Regards, Damjan Miklic

2 1

Boost.preprocessor Minor Update for 1.34.1
by Andry 08 Nov '07

08 Nov '07

Hello boost-users, You can download sources here: https://sourceforge.net/project/showfiles.php?group_id=198908&package_id=24… Main idea of this update is to add new macros BOOST_PP_MACRO_IF/BOOST_PP_MACRO_IIF to use BOOST_PP_IF/BOOST_PP_IIF more complex when i need to pass in multiple arguments like what: /////////////////////////////////////////////////////////////////////////////// //The same as BOOST_PP_IDENTITY, but different #define MY_PP_EVAL1(x1) x1 #define MY_PP_EVAL2(x1,x2) x1,x2 #define MY_PP_EVAL3(x1,x2,x3) x1,x2,x3 #define MY_PP_EVAL4(x1,x2,x3,x4) x1,x2,x3,x4 #define MY_PP_EVAL5(x1,x2,x3,x4,x5) x1,x2,x3,x4,x5 #define MY_PP_EVAL6(x1,x2,x3,x4,x5,x6) x1,x2,x3,x4,x5,x6 #define n 0 //basically is argument of another macro // if n == 0 -> //1,2; // if n != 0 -> //1,2,3; BOOST_PP_MACRO_IF(n, (1,2,3), (1,2), MY_PP_EVAL3, MY_PP_EVAL2); //More complex usage // if n == 0 -> //1,2; // if n == 1 -> //-1,0,1,2,3; // if n > 1 -> //-1,0,1,2,3,4; BOOST_PP_MACRO_IF(n, (-1,0, BOOST_PP_MACRO_IF(BOOST_PP_GREATER(n,1), (1,2,3,4), (1,2,3), MY_PP_EVAL4, MY_PP_EVAL3)), (1,2), BOOST_PP_IF(BOOST_PP_GREATER(n,1), MY_PP_EVAL6, MY_PP_EVAL5), MY_PP_EVAL2); /////////////////////////////////////////////////////////////////////////////// I uses it to properly generate template classes implementations. PS: This is slightly different than BOOST_PP_IF(n, BOOST_PP_IDENTITY(x), BOOST_PP_EMPTY)() cause x can have multiple values and used as an expression to subsequent macro. -- Best regards, Andry mailto:andry@inbox.ru

1 0

[Boost Interprocess] - Shared Memory - Dynamic memory size
by Srinivas Gardas 08 Nov '07

08 Nov '07

Hi, Is there any option to automatically increase the size of the 'Shared Memory' dynamically, in the shared memory objects of Interprocess library? Thanks & Regards, Srinivas Gardas

2 1

[Boost Users] Serialization: problems when splitting serialize into load / save
by Oliver Kania 08 Nov '07

08 Nov '07

Hello out there ! I have an urgent problem concerning boost::serialize. I have split the serialize operation into save / load as described in the tutorial: =================================================== template<class Archive> void save( Archive &ar, unsigned int version) { m_offlineMode = true; // we cannot load more when offline --> always cachedAll bool oldCachedAll = m_CachedAll; m_CachedAll = true; ar & m_CachedAll; ar & m_offlineMode; // do not serialize the lock -- use the default constructor. // we assume that no iterators that lock the cache do exist when serializing. // ar & m_Lock; ar & m_LookupId; ar & m_LookupName; ar & m_SequenceNumber; //reset old state for the case we want to continue working m_CachedAll = oldCachedAll; m_offlineMode = false; } template<class Archive> void load( Archive &ar, unsigned int version) { ar & m_CachedAll; ar & m_offlineMode; // do not serialize the lock -- use the default constructor. // we assume that no iterators that lock the cache do exist when serializing. // ar & m_Lock; ar & m_LookupId; ar & m_LookupName; ar & m_SequenceNumber; //reset old state for the case we want to continue working } BOOST_SERIALIZATION_SPLIT_MEMBER() =============================================================== The class I serialize is part of a deep class hierarchy that I want to serialize as a whole. With the standard serialize() it seems to work, but now the compiler complains ( when I want to perform the actual serialization): error C2662: 'void jedox::palo::AbstractCache<C,Exception>::save<Archive>(Archive &,unsigned int)' : cannot convert 'this' pointer from 'const jedox::palo::AbstractCache<C,Exception>' to 'jedox::palo::AbstractCache<C,Exception> &' AbstractCache is the class containing the above load / save operations kind regards, Oliver

6 7

[reflection] Compilation errors
by Christian Henning 08 Nov '07

08 Nov '07

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

6 10

shared_ptr and covariant return types
by Bernhard Wagner boost 08 Nov '07

08 Nov '07

In this post Peter Dimov shows a solution for the covariant return type problem when using shared_ptr: http://lists.boost.org/boost-users/2003/02/2996.php I'm interested in the free function solution he provides: > [snip] you can use the usual pattern from the no-covariant-return days: > > class B > { > virtual shared_ptr<B> do_clone() const = 0; > }; > > class X: public B > { > virtual shared_ptr<B> do_clone() const { return shared_ptr<X>(new > X(*this)); } > > public: > > shared_ptr<X> clone() const > { > shared_ptr<X> px = dynamic_pointer_cast<X>(this->do_clone()); > assert(px); > return px; > } > }; > > It buys you some extra safety, too. > > You could also use a free function: > > template<class X> shared_ptr<X> clone(X const & x) > { > > shared_ptr<X> px = dynamic_pointer_cast<X>(x.do_clone()); > assert(px); > return px; > } > So, to clone an object using the clone method, I could use: X* x; shared_ptr<X> spX(x = new X()); shared_ptr<X> spX2 = spX->clone(); // or: shared_ptr<X> spX3 = x->clone(); But how is the free function meant to be used? This provokes the compiler error: '... do_clone() const is private ...': shared_ptr<X> spX4 = clone(*spX); Thank you Bernhard

2 1

bgl-python installation problem
by Pablo Minguez 08 Nov '07

08 Nov '07

Hi, I'm having problems installing the python bindings for boost libraries, what I would like to use is boost.graph but from python. Boost is ok (programs and headers) but when trying to run bjam I have this error: [root][mem01][~/progs/bgl-python-0.9]# bjam error: Could not find parent for project at '.' error: Did not find Jamfile or project-root.jam in any parent directory. Is any other configuration required? Any help is welcome, many thanks in advance. Pablo. -- --------------------------------------------- Pablo Mínguez Paniagua PhD Student Bioinformatics Departament Centro de Investigación Príncipe Felipe, CIPF. Av. Autopista del Saler 16, 46013, Valencia, Spain Phone: +34 96 328 96 80 (Ext: 1011) http://bioinfo.cipf.es/

1 0

hashing a string
by Mark Wyszomierski 08 Nov '07

08 Nov '07

Hi, I'm trying to hash a string, something like: 1) Take string (password) from user 2) Hash it 3) Store to disk I see boost has some hashing features, but am not quite sure how they work. Do they do this type of thing? I'm looking for some really simple hashing, this is just for a simple application. Thanks

6 5

iterator_facade and gcc-4.3
by Benoit Hudson 08 Nov '07

08 Nov '07

"For example, when defining a constant lvalue iterator, the user can pass a const-qualified version of the iterator's value_type as iterator_facade's Value parameter and omit the Reference parameter which follows." This no longer works in current gcc 4.3 (previous issue I mentioned was a compiler bug, now fixed): it works out to generating a const lvalue in operator[], which makes gcc-4.3 give "error: type qualifiers ignored on function return type" This is either a bug in boost or a bug in gcc; not being clear on which it really is, I'll file it under boost. -- Benoît

3 3

Template type to constant string
by Robert Dailey 07 Nov '07

07 Nov '07

Hi, As you know, with Microsoft VS preprocessor operators you can convert a type passed in to a macro to a string. For example: #define TO_STRING( type ) #type I would like to do the same thing with a template type: template< typename t_type > void TO_STRING() { // Do something here with t_type to make it a string and then return it } Is there something in boost that can facilitate the behavior I'm describing? Thanks.

4 9

[boost-users] [filesystem, format] ambgious overload error.
by chun ping wang 07 Nov '07

07 Nov '07

{ boost::scoped_ptr<boost::filesystem::ofstream> myfile(new boost::filesystem::ofstream(fileOutput)); BOOST_FOREACH(int element, (getKeys<std::vector, int, int>(pMap))) { if (pMap[element] >= min_sup) { std::vector<int> row(1, element); itemsContainer.push_back(row); // (*myfile) << "(" << element << ":" << pMap[element] << ")\n"; (*myfile) << boost::format("(%1%, %2%)\n") % element % pMap[element]; } } } ./cs522/c++/aprioriMain.cpp(79) : error C2593: 'operator <<' is ambiguous C:/boost_msvc/include\boost/format/free_funcs.hpp(33): could be 'std::basic_ostream<_Elem,_Traits> &boost::operator <<<char,std::char_traits<char>,std::allocator<_Ty>>(std::basic_ostream<_Elem,_Traits> &,const boost::basic_format<Ch> &)' [found using argument-dependent lookup] with [ _Elem=char, _Traits=std::char_traits<char>, _Ty=char, Ch=char ] C:/boost_msvc/include\boost/filesystem/path.hpp(617): or 'std::basic_ostream<_Elem,_Traits> &boost::filesystem::operator <<<boost::basic_format<Ch>>(std::basic_ostream<_Elem,_Traits> &,const Path &)' [found using argument-dependent lookup] with [ _Elem=char, _Traits=std::char_traits<char>, Ch=char, Path=boost::basic_format<char> ] while trying to match the argument list '(boost::filesystem::ofstream, boost::basic_format<Ch>)' with [ Ch=char ] note the commented out version works.. this only happens on msvc 2005. it passes on mingw devc++.

1 1

Compile issue with boost::archive::xml_oarchive
by Gerald Fordyce 07 Nov '07

07 Nov '07

Hi, I am attempting to use boost::serialization to serialize a simple derived class to an XML archive. I have no problem creating a text archive - code compiles and the text archive contains both base class and derived class members. If I switch to the boost::archive::xml_oarchive it no longer compiles. Here is the code creating the archive: const DerivedClass obj; std::string filename = "fooBar.xml"; std::ofstream ofs(filename.c_str()); assert(ofs.good()); { boost::archive::xml_oarchive oa(ofs); oa << obj; } Here is the gcc-4.1.2 compiler output (Ubuntu): /usr/local/include/boost-1_34/boost/archive/basic_xml_oarchive.hpp: In member function ‘void boost::archive::basic_xml_oarchive<Archive>::save_override(T&, int) [with T = const DerivedClass, Archive = boost::archive::xml_oarchive]’: /usr/local/include/boost-1_34/boost/archive/detail/interface_oarchive.hpp:79: instantiated from ‘Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = const DerivedClass, Archive = boost::archive::xml_oarchive]’ mkevents.cpp:81: instantiated from here /usr/local/include/boost-1_34/boost/archive/basic_xml_oarchive.hpp:83: error: invalid application of ‘sizeof’ to incomplete type ‘boost::STATIC_ASSERTION_FAILURE<false>’ So I'm wondering if the requirements for using txt_oarchive are different than for xml_oarchive? It seems they should both work the same. Thanks Gerald

2 1

[boost] [review] Exception - result
by Tobias Schwinger 07 Nov '07

07 Nov '07

I'm pleased to announce that the Exception library has been accepted into boost. Thanks to all formal and informal reviewers and to Emil Dotchevski for the library! Summary of possible improvements: ================================= Design ------ Nearly all reviewers made suggestions for syntactic improvements. The "tag(value) syntax" (as suggested by John Torjo) for instance provides sufficient syntactic sugar and seems lightweight to implement. Suggested features in this area are (those are implementable on top of the current design - but will keep users from reinventing the wheel if provided by the library): - Support for grouping information, and - support for generating stack traces. I personally still have a bad feeling about 'enable_error_info' - let's just revisit and discuss it on the list before changing boost::throw_exception. The related discussions about clone/rethrow support is still ongoing. Documentation ------------- Best practices for the catch-site should be clarified in the documentation. Same goes for using the same tag multiple types with one exception object. Other comments should be addressed (I won't put much energy into summarizing documentation comments, guessing most of them might have been taken care of, already). Deployment ---------- There was a suggestion (from Pavel Vozenilek) to put #ifdef around the code of boost::exception that could be put into a separate translation unit. There should probably also be a 'build' directory and a Jamfile so there is smooth integration with the Boost build system. Of course, Jamfiles for test/examples should be added. Implementation -------------- Several reviewers noted that the library is rather allocation-heavy. It pretty much comes down to shared_ptr overuse (causing many unnecessary allocations of small objects and synchronized instructions to be executed) though not in performance critical code possibly affecting other threads and future allocations. -- Tobias Schwinger - Review Manager - _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/ listinfo.cgi/boost

2 1

[xpressive] un-used variables
by Jeff Flinn 07 Nov '07

07 Nov '07

We compile our app with -Wunused-variables on the Mac with gcc 4.0. We get several unused variable warnings due to <boost/xpressive/regex_primitives.hpp>. Is there some facility for quieting these from xpressive itself? We currently are using #pragma unused ( eol, ...) to quiet the list of about 15 unused variables. Thanks, Jeff Flinn

2 4

[BGL] property_map not compiling because it's not l-value?
by Ferng, Andrew D 07 Nov '07

07 Nov '07

Hi, I'm trying to use the concepts in the Kevin Bacon example in my code and am having trouble with compiling. http://www.boost.org/libs/graph/doc/kevin_bacon.html When I compiled the example by itself, it ran fine. However when I changed it to my data, then it gave me a compile error of "error C2106: '=' : left operand must be l-value" I don't know why this is, other than variable name, I just changed the vertex type from string to index. Nothing that I can see would cause this. The line not compiling is "grid_id[u] = gid;" See below for code. ************************************************************************ **************************** typedef property_map<ConnectionGraph, vertex_index_t>::type vertexID_MapType; typedef property_map<ConnectionGraph, edge_index_t>::type edgeID_MapType; vertexID_MapType grid_id = get(vertex_index, interfaceGraph); edgeID_MapType connectingElement_id = get(edge_index, interfaceGraph); typedef graph_traits<ConnectionGraph>::vertex_descriptor Vertex; typedef std::map<long,Vertex> NameVertexMap; NameVertexMap edges; for(CELAS2::iterator itr = CELAS2s.begin();itr != CELAS2s.end(); ++itr ) { long gid = (*itr)->getSideA_1Grid(); NameVertexMap::iterator pos; bool inserted = false; Vertex u, v; tie(pos, inserted) = edges.insert(std::make_pair(gid, Vertex())); if (inserted) { u = add_vertex(interfaceGraph); grid_id[u] = gid; <<<<-------- ************ this is the line that VS is saying non l-value. **************** pos->second = u; } else u = pos->second; } ************************************************************************ *************************** Any ideas why this is? I'm confused as to what's causing this. Any other way to populate the property map? I'm using VS2005 and boost 1.33.1. Thanks!

2 3

ublas::vector<A>
by e r 07 Nov '07

07 Nov '07

hi, is it possible to do ublas::vector<A> vec; where A is a class that i define, not a built in type? if so, what are the requirements on A?

1 0

boost.python switching from v2.5 to v2.4
by desai3＠cooper.edu 06 Nov '07

06 Nov '07

Hi all: I have used Boost.Python successfully to wrap around C++ API in python2.5. I must say that boost.python is an amazing library. However, if I want to create the same API for python2.4 do I have to rebuild the boost with python2.4 and then run bjam again, or is there any simple solution than that? The reason for asking this is because changing the Jamrules file did not help much. Thank you for your help. Maulik

2 1

[filesystem] Apparent non-compliant code in current operations.hpp, ...
by Marty Fried 06 Nov '07

06 Nov '07

While building 1_34_1 on various platforms we support, I came across some compile errors for the AIX compiler, xlC/vacpp that weren't caught by gcc or MSVC, possibly due to being hidden by a level of indirection. The errors were mostly undefined classes where the template class was fully defined at the time of instantiation. I apologize if my explanation isn't clear or totally correct - I'm not an expert on the C++ standard, and got a lot of the actual explanation from coworkers that know it better than I do. But it's up to me to do the actual reporting and to try to get it to work for us on all the platforms we support. My original post was a few days ago, with the subject "[filesystem] vacpp errors building 1_34_1 filesystem library on AIX". I am because it may look like a vacpp problem, which is an unsupported compiler, but it's not really. It just happens that xlC was the only compiler that caught the error, I think. My original post can also be read at this link: http://permalink.gmane.org/gmane.comp.lib.boost.user/31028 The problem is that the class basic_directory_iterator is not fully defined until after it is used by remove_all(). There were a few other similar errors which I can provide if someone takes an interest in this. If I am wrong, or if there is a reason this won't be fixed, it would be helpful to know, so we can decide what to do. -- Marty Fried Senior Software Developer, Aldon USA http://www.aldon.com

3 7

boost timers
by Mark Wyszomierski 06 Nov '07

06 Nov '07

Hi, Do any of the boost timer methods allow elapsed time to be measured in a separate thread? Something like: int main() { boost_thread timer; timer.Start(); while () { // some timeout. sleep(5000); // check how much time has passed. cout << timer.GetElapsedTime() << endl; } return 0; } Thanks

2 2

[program options] storing values into a set instead of vector?
by Ovanes Markarian 06 Nov '07

06 Nov '07

Hello all! I would like to allow only unique parameters to be stored: param = X param = Y param = X should result in a collection of {X, Y} Therefore I want my params to be stored in a set instead of vector? Is there any chance to implement/specify it without putting the params into the vector of strings and re-inserting them into a set? Doing it the way: value<string_set>() result in an error. Some other question? As I see "program options" works only with basic_strings<charT>, where it is assumed that the traits class is default. What if I wish to specify my traits class for the basic_string will it work? Many thanks! Ovanes

1 0

Starting ThreadClass including Mutexes
by Honki 06 Nov '07

06 Nov '07

Hi boost-users, I'm new in the mailing list, so I hope, that I'm right here and you can help me. I want to start a ThreadClass that includes some boost::mutex variables, but it doesn't work because of the "noncopyable" definition of the mutex-class. *******************MyClass******************* ...... class OutputProcessor_C { public: ClientOutputProcessor_C(); virtual ~ClientOutputProcessor_C(); void operator()() { while( true ) { boost::xtime wakeUpTime; boost::xtime_get(&wakeUpTime, boost::TIME_UTC); wakeUpTime.sec += ( 0.05 ); boost::thread::sleep( wakeUpTime ); Process(); } } protected: void Process(); boost::mutex m_publishDataMutex; ...... ********************************************* *******************MyMain******************** ...... int main(int argc, char* argv[]) { // Classpointer boost::shared_ptr<OutputProcessor_C()> outputProcessor(new OutputProcessor_C()); // generate Thread boost::shared_ptr<boost::thread> threadOutputProcessor(new boost::thread(*outputProcessor)); ...... ********************************************* When I tried to compile the source code, there is an error - "It is not possible to copy the constructor for the class 'boost::mutex'". Where is the problem? I don't want to copy anything. If it is not possible to generate a simple thread class that includes some mutexes, that is really weak. Greetings, Matthias

2 1

[thread] static mutex construction
by Pedro Lamarão 06 Nov '07

06 Nov '07

Hello all, I've been wondering how boost::mutex plays in the static initialization game. I'm toying with a "plugin" system where plugins statically register with a singleton plugin_manager using a helper struct like this: template <typename PluginT> struct register_plugin { register_plugin () { shared_ptr<plugin_base> ptr(new PluginT); plugin_manager::instance().register(ptr); } }; static register_plugin objects, specialized for each plugin type, are constructed in an anonymous namespace to register the plugin at static initialization time, like so: namespace { register_plugin<foo_plugin> rp; } plugin_manager::instance() looks like: { static plugin_manager* s_instance; // s_mutex is a static member { boost::mutex::scoped_lock lock(s_mutex); if (s_instance == 0) { s_instance = new plugin_manager; } } return *s_instance; } So far I've implemented two plugins in this application and everything just works. It seems to me there is a static initialization race between every register_plugin object and plugin_manager::s_mutex. Am I just lucky or is there some magic about mutexes in this regard? I'm working on a Fedora 7 i386 system. -- Pedro Lamarão

2 1

[crc] Easy way to get the "correct checksum" constant?
by Norbert Unterberg 06 Nov '07

06 Nov '07

Some CRC algorithms (when using 0xFFFF as an initial value and final XOR) have a nice property that then checking the consistency of a data block that has a CRC checksum appended, the resulting checksum value is a constant. Is there an easy way to extract this constant value from boost::crc directly? Example: We use a CRC like this: typedef boost::crc_optimal<16, 0x1021, 0xFFFF, 0xFFFF, true, true> crc_type; When sending a block of data, we append the generated CRC. The receiver side feeds the complete block incluing the CRC bytes into its generator. When the data block has no errors, the crc.checksum() is always exactly 0x0F47. Currently, I manually calculate that constant by something like this: crc_type crc; crc_type::value_type val(0); crc.process_bytes(&val, sizeof(val)); m_key = crc.checksum(); Is there an easier way to extract this "crc is correct" value? Norbert

1 0

boost-users [boost::function] template.
by chun ping wang 04 Nov '07

04 Nov '07

Hi I have a problem with boost::function in association with template. I have a gain function declaration declare as this.. template < template <typename ELEM,typename = std::allocator<ELEM> > class CONT, typename T, typename U > long double gain(const CONT<boost::unordered_map<T, U> >& data, const T& attr, const T& target_attr); // old signature does compile template < template <typename ELEM,typename = std::allocator<ELEM> > class CONT, typename T, typename U > boost::any ID3( const CONT<boost::unordered_map<T, U> >&, const T&, const CONT<T> &, boost::function<long double (const CONT<boost::unordered_map<T, U> >&, const T&, const T&) > ); // new signature DOES NOT compile. template < template <typename ELEM,typename = std::allocator<ELEM> > class CONT, typename T, typename U > boost::any ID3( const CONT<boost::unordered_map<T, U> >&, const T&, CONT<T> *, boost::function<long double (const CONT<boost::unordered_map<T, U> >&, const T&, const T&) > ); In the main file i have things pass as this. // old way of passing works with old signature boost::any tree( MyAnn::ID3<std::vector, std::string, std::string>(data, target_attr, attribute, MyAnn::gain<std::vector, std::string, std::string>) ); // line 76 to 82. boost::function<long double (const std::vector<boost::unordered_map<std::string, std::string>&, const std::string&, const std::string&)> gainfunc; gainfunc = MyAnn::gain<std::vector, std::string, std::string>; boost::any tree( MyAnn::ID3<std::vector, std::string, std::string>(data, target_attr, boost::addressof(attribute), gainfunc) ); I compile the file and get teh following errors. Can anyone tell me why changing the orginial signature from const CONT<T>& to CONT<T> * all of sudden breaks the code. Thanks.

1 1

回复： [Boost-users] "Getting Started" document : missing documentation of the stdlib flag
by 鑫赖 04 Nov '07

04 Nov '07

Hi: Thank you.I try it! _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users ___________________________________________________________ 雅虎邮箱，终生伙伴！ http://mail.yahoo.com.cn/

1 0

回复： [Boost-users] How can change library name!
by 鑫赖 04 Nov '07

04 Nov '07

The "p" in the name means that you are using STLport: and that means you must use STLport when you build the regex lib as well. Take a look at the getting started guide for instructions, but you should end up with a "p" in the name once regex has been built against STLport. Hi, John: Thank you very much. So how to build boost library with STLPort, or can you tell me where to find the documents.I have read boost document, but I can't find instruction! Robin ___________________________________________________________ @yahoo.cn 新域名、无限量，快来抢注！ http://mail.yahoo.cn/

1 0

Serializing abstract classes
by Christoph 03 Nov '07

03 Nov '07

Consider the following class hierarchy: A - B - C1 \- B2 - C2 Is the following correct: * when A is an abstract class then (without any data members!) then I do not need to provide serialization support for this class * when A does have data members (and so does C) but B does not add any data and B furthermore is abstract (so the actuall class will be C1..) then no searialization support is needed for B? Is this correct? Should I provide serialization support for these classes even *if* it is correct? Best regards and thank you Christoph

2 1

boost::concept_check: ConceptConcept missing!
by Mattias Nissler 03 Nov '07

03 Nov '07

Hi, I've just recently started using boost::concept_check. It suits my needs very well and works perfectly so far. However, today I've come across something that is missing: The ConceptConcept! What I mean is a meta concept that checks whether a given template is a concept checking class. It should be relatively straightforward to implement, here is some example code I've cooked up: #include <boost/concept_check.hpp> template<template<typename T> class _TConcept> struct ConceptConcept { /* Instead of int, any type allowed as template parameter should do. */ _TConcept<int> c; void constraints() { /* Require the constraints() function to exist in _TConcept. */ c.constraints(); } }; template<template<typename TX> class T> void function() { boost::function_requires< ConceptConcept<T> >(); } template<typename T> struct NoConcept { }; int main(void) { function<boost::IntegerConcept>(); //function<NoConcept>(); // <- fails, NoConcept::constraints() is missing. } Note that due to the template template technique, this only works for ConceptConcept. Higher meta levels (e.g. ConceptConceptConcept) are not supported by this code. I'd like to see this in boost::concept_check. What do you think? Cheers, - Mattias

2 2

"Getting Started" document : missing documentation of the stdlib flag
by Vincent Torri 03 Nov '07

03 Nov '07

Hello, If I'm not mistaken, to compile boost with STLport, one must pass -stdlib=stlport (or something like that) to bjam. But it's not mentionned in the "Getiing Started" documentation (Unix or Windows), while STLport itself is mentioned. Also, stdlib is mentioned when I launch bjam with --help, --help-options or --help-internal. Can someone add the documentation of the stdlib flag in "Getting Started", please ? (and maybe also in the boost build, to get doc with bjam --help) Thank you Vincent Torri

1 0

How can change library name!
by 鑫赖 03 Nov '07

03 Nov '07

When i build boost library, how can i use "bjam" to control the library naming rules and compiler flags. i use vs2005. when i use regrex library, vc2005 always says that "can't link library boost-regrex-p-1_34_1.lib",but the library name that "bjam" produce is "boost-regrex-1_34_1.lib". The library name i can't remenber clearly,but the difference is character "p". So i want to control the the library naming rules. i don't why vc2005 link boost-regrex-p-1_34_1.lib,not other name just as the "bjam" produced. so i don't familiar with the rules vc2005 link library. ___________________________________________________________ 雅虎邮箱，终生伙伴！ http://mail.yahoo.com.cn/

2 1

SFINAE broken in Visual C++ Express?
by Ovanes Markarian 03 Nov '07

03 Nov '07

Hello! Does anybody else experience a problem using enable_if templates in Visual C++ Express 2005 SP1? I get compiler errors in this code: template<class LookUpType_> typename boost::enable_if_c<is_const, result_type>::type at(LookUpType_ const& key)const { return has_key(view_, key); } template<class LookUpType_> typename boost::disable_if_c<is_const, result_type>::type at(LookUpType_ const& key) { return has_key(view_, key); } It blames that type is not a member of enable_if_c or disable_if_c? This is really strance, since this should not be considered by compiler as a possible template instantiation. is_const is an enum value containing either true or false.

3 4

Mixing Boost thread library and Apache runtime library
by Alex 02 Nov '07

02 Nov '07

Hi, Our current code base uses Apache Runtime Library for handling multithreading code, including threads, concurrency control, etc. We are currently starting to convert to the Boost thread library. During the conversion which might take a while we would like to be able to mix the threads from the APR library with concurrency control objects (mutexes) from the Boost library. Is this ok to do this or will we run into some strange issues? We are currently running the code on Windows and Linux. Please let me know if I can provide any specifics about the APR library to better answer this question. Thank you! Alex

1 0

boost Xpress and Window CE 5.0..help me..!!
by bsakiag 02 Nov '07

02 Nov '07

Hi, all. I want to use boost Xpress on Windows CE 5.0 (w/VS2005) when compile sample code, error occors reason of "btowc()" function. if I comment out ////////////////////////// c_regex_traits.hpp ///////////////////////// #ifndef BOOST_XPRESSIVE_NO_WREGEX /// INTERNAL ONLY template<> inline wchar_t c_regex_traits<wchar_t>::widen(char ch) { using namespace std; return btowc(ch); <<-------------- here!!! } #endif ////////////////////////////////////////////////////////////////////// this function not supported in Windows CE. is there any solution of the compile error? regards, from bstill. ps: when I compile with "BOOST_XPRESSIVE_NO_WREGEX" preprossor, another errors are occur. ________________________________________________________ 존경하는 선생님께 고마움의 메시지 보내고 선물 받으세요! - 모두가 행복한 세상이 됩니다. UCC 참여하기 http://kr.fun.kids.yahoo.com/funnybox/thankyou.html

2 1

Is anyone going to tell me the way to set the WINDOWS variables for BOOST?
by question boost 02 Nov '07

02 Nov '07

Hi, in the boost directory named "boost_1_33_1" I 've downloaded, which directories do I have to indicate to the variables INCLUDE and LIB in order to set them? THANK YOU VERY MUCH, David _________________________________________________________________ Retrouvez Windows Live Messenger sur votre mobile ! http://www.messengersurvotremobile.com

3 4

Re: [Boost-users] Boost-users Digest, Vol 1438, Issue 1
by Pavlo Korzhyk 02 Nov '07

02 Nov '07

It is definitely possible given the resources required:) This will be great to have an application server and a set of APIs and tools for C++. At the moment we have most of the libraries, one main gap is OO-persistance, probably implemented as an ORM. I use boost.serialization, it's cool, but it is not enough IMHO: Library I dream about would serialize separate objects and fetch them when needed from one archive. And boost.serialization doesn't provide neither ACID transactions nor iterators over the content of the archive. There is also a lack of "JSP" compiler - but it's not that hard to implement. So all is needed is to implement these two things, then take Apache, cgixx and you have J2EE in C++. And when you have all the bricks - you don't actually need a specification or a ready to use standard, because putting it all together is (looks like) a piece of cake. It's a lot of work, but it's not that much as "mammoth effort" :) PS Correct me if my comments on the current state of the free C++ libraries is wrong. I listed the problems for which I tried but didn't find any ready-to-use solution. So any hints like "take a look at xyz.sourceforge.net" are highly appreciated. > From: Stefan Kok <stefan(a)opensolutions.co.za> > Subject: [Boost-users] C++ & Enterprise Solutions > To: boost-users(a)lists.boost.org > Message-ID: <1193982052.13506.43.camel(a)kobus.opensol.local> > Content-Type: text/plain > > Dear List > > If this is not the correct list to post to. Then please forgive my > ignorance. > > I have been admiring the work of Boost and its contributors for some > time now. My questions / comments : > > 1) Would their be any benefit to the community, developing a > specification for C++ similar to SUN's J2EE and JEE specification ? > > I do realize this would require a mammoth effort as well as commitment > in terms of resources. > > 2) Is it possible to establish such a project under the open source > banner ? > > Given the commitment and resources required. > > 3) Would this be reinventing the wheel ? > > > I know SUN & Java got there first (the J2EE thing). But C++ does have > some very powerful features which makes it unique in some ways, > templates for one. > > WBR, Pavlo Korzhyk ICQ#155870780

1 0

[boost-users] [program options]
by chun ping wang 02 Nov '07

02 Nov '07

HI how would I use program options to accept multiple input. Example I have a diffieHellmanKeyExchange program running through command prompt. // begin main program #include <iostream> #include <boost/tuple/tuple_io.hpp> #include <boost/program_options.hpp> #include "cppdef/BitOperation.cpp" #include "cppdef/mathfunc.cpp" #include "cppdef/IsPrime.cpp" #include "cppdef/DiffieHellman.cpp" #include <BigInteger.hpp> #include <BigIntegerUtils.hpp> int main( int ac, char* av[] ) { namespace po = boost::program_options; po::options_description desc("Allowed options"); boost::tuple<BigInteger, BigInteger> key_pair; desc.add_options() ("generate", "generates a pair of key") ("secert", po::value(&key_pair), "creates the share secret key"); po::variables_map vm; po::store(po::parse_command_line(ac, av, desc), vm); po::notify(vm); if (vm.count("generate")) { BigInteger my_prime = encryptcpw::random_prime<BigInteger>(&algocpw::Miller_Rabin<BigInteger>, 10); std::cout << "my prime: " << my_prime << "\n"; boost::tuple<BigInteger, BigInteger> pare(encryptcpw::dh_init<BigInteger>( my_prime )); std::cout << "pair of generated number: " << pare << "\n"; } if (vm.count("secert")) { const BigInteger p( encryptcpw::random_prime<BigInteger>(&algocpw::Miller_Rabin<BigInteger>, 10)); std::cout << encryptcpw::dh_secret<BigInteger>( p, boost::tuples::get<0>(key_pair), boost::tuples::get<1>(key_pair)); } } // end program The thing compiles but when I do DiffieHellman.exe --secert 817 697 I get this error. C:\CPW\cs_classes>DiffieHellmanEncrypt --secert 817 697 terminate called after throwing an instance of 'boost::program_options::invalid_ option_value' what(): in option 'secert': invalid option value '817' This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information.

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custom formatting the current local date time into a string
by Jeff 02 Nov '07

02 Nov '07

Hello, How can I grab the current local date and time, and format it so that it looks like this: YYYY_MMM_DD_HH_MM_SS ? I can't seem to get the facet stuff to work right. Thanks, Jeff

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[boost-users] [general question] deciding to use member function or not.
by chun ping wang 02 Nov '07

02 Nov '07

Hi is their a simple way *at compile time *to determine if a member function exist for a particular instance, if yes than use that function otherwise do not use it. example std::list<int> li; // check if unique is a member function of li, if yes use unique. li.unique(); // else use stl unique. std::unique(li.begin(), li.end());

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boost::posix::time_duration
by Michael Thurston 02 Nov '07

02 Nov '07

[boost][date_time] Hi there, I have a question about the boost::posix::time_duration class. It has accessors such as: - hours() - minutes() that return a data type of long. I would have expected it to return a datatype of boost::int64_t (or boost::int32_t) because could there be a risk that the return value would cause an overflow on an 8 bit embedded platform. Regards, Michael

1 0

C++ & Enterprise Solutions
by Stefan Kok 02 Nov '07

02 Nov '07

Dear List If this is not the correct list to post to. Then please forgive my ignorance. I have been admiring the work of Boost and its contributors for some time now. My questions / comments : 1) Would their be any benefit to the community, developing a specification for C++ similar to SUN's J2EE and JEE specification ? I do realize this would require a mammoth effort as well as commitment in terms of resources. 2) Is it possible to establish such a project under the open source banner ? Given the commitment and resources required. 3) Would this be reinventing the wheel ? I know SUN & Java got there first (the J2EE thing). But C++ does have some very powerful features which makes it unique in some ways, templates for one. Thank you in advance. Stefan.

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[Boot.Pool] Opinions about inconsistent pointer types
by David Baird 01 Nov '07

01 Nov '07

Hi, I was looking through the Pool code and noticed that it presents inconsistent pointer types to the user ("void *" versus "char *"). For example, if the user wants to implement his/her own user allocator, they have to write it like, e.g. (using "char *" as the pointer type): struct default_user_allocator_new_delete { typedef std::size_t size_type; typedef std::ptrdiff_t difference_type; static char * malloc(const size_type bytes) { return new (std::nothrow) char[bytes]; } static void free(char * const block) { delete [] block; } }; However, other classes return "void *" as their pointer types, e.g. singleton_pool: template <typename Tag, unsigned RequestedSize, typename UserAllocator, typename Mutex, unsigned NextSize> struct singleton_pool { static void * malloc() { pool_type & p = singleton::instance(); details::pool::guard<Mutex> g(p); return p.p.malloc(); } } Is it really important that the types be different? I just think it might be more elegant to use "void *" in more places - it would make more things the same and be similar to e.g. "std::malloc/free". -David

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Serialization of C dynamic data
by Lorenzo Cavallaro 31 Oct '07

31 Oct '07

Hi, I'm trying to serialize the following piece of code (a data structure whose object size is dynamically allocated and it should use the correct size/len which has been serialized). typedef struct data { char *payload; size_t len; } data_t; vector<data_t *> v; So I added the corresponding serialize function to the structure definition void serialize(Archive & ar, const unsigned int file_version) { ar & len; for (int i = 0; i < len; i++) ar & payload[i]; } Moreover, I added a default constructor which is invoked by the serialization library whenever the object has to be unserialized data::data() { /* no error checking */ payload = (char *)calloc(1, X); len = X; } Now, of course X is fixed. I'd like to reuse the serialized 'size' (ar & size) as argument to the calloc to be able to create an object with the right size instead of having to approximate (exceeding, of course) its real dimension. Do you have any idea how to get it work the way I'd like to, please? -- if it's possible, of course. Nevertheless to say that with a right X everything works fine. I was thinking to iterate over all the elements, after the unserialization step is over, to reallocate payload using the right len... but it sucks :-) TIA, bye Lorenzo -- Lorenzo `Gigi Sullivan' Cavallaro <sullivan(a)security.dico.unimi.it> GPG key at http://security.dico.unimi.it/~sullivan/sullivan.asc Until I loved, life had no beauty; I did not know I lived until I had loved. (Theodor Korner) See the reality in your eyes, when the hate makes you blind. (A.H.X)

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[Boost users] [interprocess]: static_pointer_cast on offset_ptr
by Lars Hagström 31 Oct '07

31 Oct '07

Hi, In offset_ptr.hpp the static_pointer_cast<> &co are commented out. Why is this? I need something of the kind to do casts from a void* to a bool*, for example. Is there something I am missing? Lars

3 4

REGEXP - Serializing regexp ?
by Jacques-Olivier Goussard 31 Oct '07

31 Oct '07

Hi I'm trying to use the boost-regexp package and I'm facing an issue with this. I'm basically applying a replace algo on a list of strings using a huge list of regular expressions. It seems that the boost-regexp API allows me only to either load all regular expressions in memory (i.e creating the regexp at process start) or load one regexp at a time but re-compile it each time. Is there a way to save to disk the compiled version of the regexp (so that the regexp package would not have to re-create the statemachine) ? If not, what would be the best approach for doing this ? Thanks /jog

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Re: [Boost-users] Regex: Invalid preceding regular expression, problem
by Brian Krahmer 31 Oct '07

31 Oct '07

> Nope there's a bug in the options you are using - boost::regex::extended > enables the "POSIX extended" flavour of regular expressions - and these > don't support non-greedy repeats. Use boost::regex::perl if you want to use > these (since you are using Perl-style regexes). > > HTH, John. > That helps very much. Thanks for clearing that up for me, John. brian

1 0

Preprocessor lib question -- how to fold a macro that produces comma in its output across a sequence?
by Yu Di 31 Oct '07

31 Oct '07

Hi, I am trying to use the preprocessor lib to generate something like Cons<a, Cons<b, Cons<c, Cons<d, Nil> > > > from (a) (b) (c) (d) I tried something like #define START(x) Cons<x,Nil> #define ADD(s,state,x) Cons<x,state > #define GENERATE(x) BOOST_PP_SEQ_FOLD_RIGHT(ADD,START(BOOST_PP_SEQ_HEAD(BOOST_PP_SEQ_REVERSE(x))),BOOST_PP_SEQ_POP_BACK(x)) but immediately got into trouble with the commas. The best I can do is to add parentheses around the content of START and ADD, but that generated (Cons<a, (Cons<b, (Cons<c, (Cons<d, Nil>) >) >) >) which is not valid. Is there any way I can achieve the desired output? Thanks, Di, Yu 10.30 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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FILE boost\preprocessor\arithmetic\dec.hpp
by question boost 31 Oct '07

31 Oct '07

Hi, I' ve the following error message: FILE C:\Documents and Settings\src\boost\preprocessor\arithmetic\decc.hpp LINE 17 boost/preprocessor/config/config.hpp no such file or directory So I look at decc.hpp, it contains the line # include <boost/preprocessor/config/config.hpp> and I look at the directory C:\Documents and Settings\src\boost\preprocessor\config, it contains the file config.hpp IS ANYONE GOING TO TELL ME WHAT IS THE PROBLEM WITH THOSE BOOST FILES? THANK YOU VERY MUCH 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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graph python bindings : unpickle hangs
by John Reid 31 Oct '07

31 Oct '07

Hi, Unpickling an empty boost.graph seems to hang. E.g. In [1]: import boost.graph as bgl In [2]: g=bgl.Graph() In [3]: import cPickle In [4]: cPickle.dumps(g) Out[4]: 'cboost.graph._graph\nGraph\np1\n(tRp2\n((dp3\nI0\n(l(d(dtb.' In [5]: cPickle.loads(cPickle.dumps(g)) *** never returns *** I'm using the latest SVN revision of bgl-python. John.

1 0

Extracting libraries from boost?
by Angel Tsankov 31 Oct '07

31 Oct '07

Can libraries in boost be used on their own, i.e. can I extract one of them and use it in a project? In particular, I only need the smart_ptr and ref libraries in one of my projects.

4 4

Regex: Invalid preceding regular expression problem
by Brian Krahmer 31 Oct '07

31 Oct '07

Hello, I'm a new member to the mailing list. BTW, thanks to everyone who contributes to boost. It's a fantastic software. I am having a problem with building an expression object. The line in question reads 'boost::regex expression(pattern, options);', where I'm using the boost::regex::extended option, and the pattern looks like this: "^([0-7]\\..*|8\\.0(\\.[0-3](\\.[0-3])?)?)[^.0-9]*?$". I fired up a ruby interpreter, and it handled the regex fine (using "8.0.0.1 (en-US)" as a positive, and "9.0.0.1 (en-US)" as a negative). Can anybody tell me what is wrong with this regex, or confirm that there may be a bug in the library? thanks, brian

2 1

[Regex] Why does this example code not compile?
by Mike Thornton 31 Oct '07

31 Oct '07

Using g++ on a GNU Ubuntu Linux 7.04 machine, I am unable to compile the boost example code (saved as test.cpp) at http://www.boost.org/libs/regex/example/snippets/partial_regex_match.cpp Although I can compile my own code which does not use boost, I get a lot of garbled output from the example code...part of which is listed below. Any ideas on what is wrong and how to fix it? test.cpp : (.text._ZN5boost9re_detail12perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS6_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEC1ES6_S6_RNS_13match_resultsIS6_S9_EERKNS_11basic_regexIcSD_EENS_15regex_constants12_match_flagsES6_[boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, __gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >)]+0xea): undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)' Thanks. Mike

4 4

Using date/time to format date strings
by Andrew 31 Oct '07

31 Oct '07

Hi all, I'm trying to use the date time library to to do some string formatting but I'm afraid there's something I'm missing. What I'd like to do is feed in a string "05/Aug/2007 11:30" and convert it to an ISO formatted string - could anyone point me in the right direction? I've examined both the documentation and the sample code in io_tutorial.cpp but I'm afraid it hasn't helped - the code below is as far as I've gotten and simply returns the input string unchanged. I'm using boost 1.34.1 with MSVC 2005. Thanks much, Andrew //Begin snippit string formatDate(string inpDate) { stringstream ss; local_date_time checkDate(not_a_date_time); local_time_input_facet* input_facet = new local_time_input_facet(); local_time_facet* output_facet = new local_time_facet(); ss.imbue(locale(locale::classic(), output_facet)); ss.imbue(locale(ss.getloc(), input_facet)); input_facet->format("%d/%b/%Y %H:%M"); output_facet->set_iso_format(); ss << inpDate; return ss.str(); }

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