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

[intrusive] how to change the value of an item in a set?
by Raymond Haeb 09 Apr '08

09 Apr '08

Hello, namespace bi = boost::intrusive; typedef bi::set<relation, bi::constant_time_size<false> > set_type; set_type set; class relation: private boost::noncopyable, public bi::set_base_hook<optimize_size<true> > { public: boost::uuid const &get_uuid() const { return uuid_; } void change_uuid( boost::uuid const& uuid ) { unlink(); uuid_ = uuid; // TODO: reinsert it with the new uuid, // or leave it linked and find a way to tell the set, // that the value has been changed and the tree is // invalid } struct uuid_cmp { bool operator()( boost::uuid const &id, relation const &rel ) const { return id < rel.get_uuid(); } bool operator()( relation const &rel, boost::uuid const &id ) const { return rel.get_uuid() < id; } }; bool operator<( relation const &a ) const { return uuid_ < a.uuid_; } private: boost::uuid uuid_; } So the question is in the comment: Is there a way to change the value of an element of a set or insert an (new) element in a set, without having a pointer to the set? TIA, Raymond

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Egg 2nd request for reviews
by dan marsden 09 Apr '08

09 Apr '08

Hi All The review of the Egg library by Shunsuke Sogame has been running for 1 week now. There has been some discussion of the library on a couple of related threads, but no reviews submitted so far. Please try and find time to submit a review of this library if possible. If you wish to review, but don't have time before the review ends on April 13th, please post to that effect, we may be able to extend / move the review period to help reviewers. Introduction: It is not so easy to define Function Objects especially if you want to support Boost.ResultOf and Boost.Lambda. Therefore, as Boost provides iterator_facade and iterator adaptors, Egg provides function_facade and function adaptors. Egg provides the following features: * Workaround for the Forwarding Problem http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1385.htm * Helpers to build Function Objects: * egg::function and egg::function_facade provides the way to build Function Objects which supports Boost.ResultOf and Lambda. * Function Objects Adaptors(in other words, higher-order functions): * egg::curryN supports the currying. * egg::pipable emulates extension methods(C#). * egg::fuse/unfuse emulates variadic functions. * egg::nestN represents nested lambda expressions. * etc... The documentation is on line: http://p-stade.sourceforge.net/boost/libs/egg/ The zipped source code is in Vault/FunctionObjects: http://tinyurl.com/34lgda Tested under: Boost Development Trunk and Boost Version1.34.1. --------------------------------------------------- Please always state in your review, whether you think the library should be accepted as a Boost library! Additionally please consider giving feedback on the following general topics: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? Thanks Dan Marsden Review Manager ___________________________________________________________ Yahoo! For Good helps you make a difference http://uk.promotions.yahoo.com/forgood/

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Stupid build question
by Johan Råde 09 Apr '08

09 Apr '08

What syntax do I use to build both static and shared libraries? Is there a doc page anywhere that explains basic bjam command line syntax? I'm tired of having to ask stupid questions like this all the time. The Getting Started Guide contains too little info and, to me, the Boost Build reference documentation is completely unintelligible. --Johan

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libboost_* compile error in qnx
by Ricardo Perrone 09 Apr '08

09 Apr '08

Hi, I am trying to compile/install boost libraries (1.35.0 version) and some erros appears in console: # ./configure --without-icu --with-libraries=regex,filesystem Building Boost.Jam with toolset qcc... tools/jam/src/bin.qnxntox86/bjam Unicode/ICU support for Boost.Regex?... disabled. Backing up existing Boost.Build configuration in user-config.jam.25 Generating Boost.Build configuration in user-config.jam... Generating Makefile... # make install ./tools/jam/src/bin.qnxntox86/bjam --user-config=user-config.jam --prefix=/usr/local --exec-prefix=/usr/local --libdir= /usr/local/lib --includedir=/usr/local/include --with-regex --with-filesystem install Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (don't panic: this is a strictly optional feature). ...patience... ...found 11243 targets... ...updating 12 targets... qcc.compile.c++ bin.v2/libs/system/build/qcc/release/threading-multi/error_code.o libs/system/src/error_code.cpp: In member function `virtual std::string <unnamed>::posix_error_category::message(int) const': libs/system/src/error_code.cpp:112: error: `strerror_r' undeclared (first use this function) libs/system/src/error_code.cpp:112: error: (Each undeclared identifier is reported only once for each function it appears in.) libs/system/src/error_code.cpp: In member function `virtual boost::system::error_condition <unnamed>::system_error_category::default_error_condition(int) const': libs/system/src/error_code.cpp:167: error: duplicate case value libs/system/src/error_code.cpp:164: error: previously used here cc: /usr/qnx632/host/qnx6/x86/usr/lib/gcc-lib/i386-pc-nto-qnx6.3.0/3.3.5/cc1plus error 1 "QCC" -Wc,-ftemplate-depth-100 -O3 -Wc,-finline-functions -Wc,-Wno-inline -shared -DBOOST_ALL_NO_LIB=1 -DBOOST_SYSTE M_DYN_LINK=1 -DNDEBUG -I"." -c -o "bin.v2/libs/system/build/qcc/release/threading-multi/error_code.o" "libs/system/src/e rror_code.cpp" ...failed qcc.compile.c++ bin.v2/libs/system/build/qcc/release/threading-multi/error_code.o... ...skipped <pbin.v2/libs/system/build/qcc/release/threading-multi>libboost_system-mt-1_35.so.1.35.0 for lack of <pbin.v2 /libs/system/build/qcc/release/threading-multi>error_code.o... ...skipped <p/usr/local/lib>libboost_system-mt-1_35.so.1.35.0 for lack of <pbin.v2/libs/system/build/qcc/release/threadi ng-multi>libboost_system-mt-1_35.so.1.35.0... ...skipped <p/usr/local/lib>libboost_system-mt.so for lack of <p/usr/local/lib>libboost_system-mt-1_35.so.1.35.0... ...skipped <pbin.v2/libs/filesystem/build/qcc/release/threading-multi>libboost_filesystem-mt-1_35.so.1.35.0 for lack of <pbin.v2/libs/system/build/qcc/release/threading-multi>libboost_system-mt-1_35.so.1.35.0... ...skipped <p/usr/local/lib>libboost_filesystem-mt-1_35.so.1.35.0 for lack of <pbin.v2/libs/filesystem/build/qcc/release /threading-multi>libboost_filesystem-mt-1_35.so.1.35.0... ...skipped <p/usr/local/lib>libboost_filesystem-mt.so for lack of <p/usr/local/lib>libboost_filesystem-mt-1_35.so.1.35.0 ... common.copy /usr/local/lib/libboost_regex-mt-1_35.so.1.35.0 common.hard-link /usr/local/lib/libboost_regex-mt.so ...skipped <p/usr/local/lib>libboost_system-mt-1_35.so for lack of <p/usr/local/lib>libboost_system-mt-1_35.so.1.35.0... ...skipped <p/usr/local/lib>libboost_filesystem-mt-1_35.so for lack of <p/usr/local/lib>libboost_filesystem-mt-1_35.so.1 .35.0... ln-UNIX /usr/local/lib/libboost_regex-mt-1_35.so ...failed updating 1 target... ...skipped 8 targets... ...updated 3 targets... Not all Boost libraries built properly. Does anybody know how to solve this? My qcc/QCC is set to 3.3.5,gcc_ntox86. The same error appears when i try with bjam Thanks Ricardo ____________________________________________________________________________________ You rock. That's why Blockbuster's offering you one month of Blockbuster Total Access, No Cost. http://tc.deals.yahoo.com/tc/blockbuster/text5.com

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boost::asio connect_timeout example problem.
by j.c. 09 Apr '08

09 Apr '08

I am having a timeout example code problem, modified code is below: class connect_handler { public: connect_handler(io_service& ios) : io_service_(ios), timer_(ios), socket_(ios) { socket_.async_connect( tcp::endpoint(boost::asio::ip::address_v4::loopback(), 32123), boost::bind(&connect_handler::handle_connect, this, boost::asio::placeholders::error)); timer_.expires_from_now(boost::posix_time::seconds(5)); timer_.async_wait(boost::bind(&connect_handler::close, this)); } void handle_connect(const boost::system::error_code& err) { if (err) { std::cout << "Connect error: " << err.message() << "\n"; } e lse { // We need to cancel the timeout since we have connected. timer_.cancel(); // < Fires the timer regardless. Because we are calling cancel() from inside an io_service call??? std::cout << "Successful connection\n"; } } void close() { socket_.close(); } private: io_service& io_service_; deadline_timer timer_; tcp::socket socket_; };

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boost.lambda and std::abs(double)
by Olaf Peter 09 Apr '08

09 Apr '08

Hi, why does the following code not compile? ---8<--- #include <iostream> #include <boost/array.hpp> #include <boost/lambda/lambda.hpp> #include <algorithm> #include <cmath> int main() { using namespace ::boost::lambda; const boost::array<double, 10> factor = { 1e12, 1e9, 1e6, 1e3, 1, 1e-3, 1e-6, 1e-9, 1e-12, 1e-15 }; boost::array<double, 10> values; std::transform( factor.begin(), factor.end(), values.begin(), std::abs( ret<double>( 1e3 / _1 ) ) ); } --->8--- si_short.cpp: In function 'int main()': si_short.cpp:28: error: no matching function for call to 'abs(const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::explicit_return_type_action<double>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::divide_action>, boost::tuples::tuple<const double, boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >)' /usr/include/stdlib.h:691: note: candidates are: int abs(int) /usr/include/c++/4.2/cstdlib:143: note: long int std::abs(long int) /usr/include/c++/4.2/cstdlib:174: note: long long int __gnu_cxx::abs(long long int) /usr/include/c++/4.2/cmath:89: note: double std::abs(double) /usr/include/c++/4.2/cmath:93: note: float std::abs(float) /usr/include/c++/4.2/cmath:97: note: long double std::abs(long double) Thanks, Olaf

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Fwd: RE: boost build for Windows
by rishi keisham 09 Apr '08

09 Apr '08

This is one of the solution to boost build for Windows... as stated by Thomas. Thanks, Keisham Note: forwarded message attached. --------------------------------- From Chandigarh to Chennai - find friends all over India. Click here.

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[Serialization] Why is std::string a primitive type? Tracking for share_ptr
by Jeffrey A. Edlund 08 Apr '08

08 Apr '08

I'm trying to serialize a hierarchical data structure like the following: class StorageVar; typedef std::vector<StorageVar> sv_list; typedef std::map<std::string, StorageVar > sv_dict; typedef std::pair<std::string, StorageVar > sv_dict_pair; typedef boost::variant < boost::shared_ptr<size_t>,boost::shared_ptr<int>,boost::shared_ptr<double>,boost::shared_ptr<std::string>, boost::shared_ptr<std::vector<size_t> >, boost::shared_ptr<std::vector<int> >, boost::shared_ptr<std::vector<double> >, boost::recursive_wrapper<boost::shared_ptr< sv_list > >, boost::recursive_wrapper<boost::shared_ptr< sv_dict > >, boost::recursive_wrapper<boost::shared_ptr< sv_dict_pair > > > StorageVar_data_imp; class StorageVar_imp { public: StorageVar_imp(): data(new StorageVar_data_imp) {}; boost::shared_ptr<StorageVar_data_imp> data; boost::shared_ptr<sv_dict> attributes; }; class StorageVar { public: boost::shared_ptr<StorageVar_imp> content; StorageVar(): content(new StorageVar_imp) {}; /* Further functionality removed for clarity. */ } I had been hoping to serialize this nonintrustively, but quickly ran into problems. Here's my understanding of the situation: As has been mentioned on the list before, Boost.Serialize refuses to serialize shared_ptrs to primitive types because tracking is turned off for primitive types and cannot be turned on. Primitive types used in my example include size_t,int,double, and std::string. I can understand (sort of) why you wouldn't want to track all the numeric types, but I don't understand why std::string is considered now considered a primitive. (Looking at boost/serialization/string.hpp indicates that it wasn't a primitive type at some point.) The way that's mentioned in the archive to get around this is to use BOOST_STRONG_TYPEDEF(int,tracked_int) etc. This would require that I change the data structure (an intrusive change) and add a static_cast< T&>(variable) everywhere these wrapped variables are used. (This is because the "strong" typedef really just makes a new class with your type inside it with basic methods defined.) The other possible solution that I've looked at is to define void serialize(Archive &ar, boost::shared_ptr<T> & arg, const unsigned int version) myself for all my primitive types. That seems like the wrong thing to do, but I'll probably do something with that until I find a better way. I might be missing something, but couldn't boost/serialization/shared_ptr.hpp be rewritten to keep track of all the pointers that it sees without turning tracking on for all primitive types? Basically just automatically track anything that's inside a shared_ptr. The programmer shouldn't be storing both a shared_ptr to memory and a normal pointer to the same memory anyway. Other info: Boost trunk r44086 (yesterday) built on Ubuntu with g++. (I had been using 1.33.1 but that seemed to have problems serializing vector<int>.) Thanks, Jeffrey

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Failure while building the library with bjam
by Michael Bradley Jr 08 Apr '08

08 Apr '08

Hi, while building the boost library (trunk) we getting the following message: compiler MS Visual Studio 2005 @ win XP SP2 any help to overcome this? Thanks in advance Best regards Mike C:\boost>"bin\bjam.exe" -d 0 stage --stagedir=. toolset=msvc-8.0 link=static runtime-link=s tatic threading=multi --without-mpi architecture=x86 release debug address-model=32 warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (don't panic: this is a strictly optional feature). text_iarchive.cpp .\boost/archive/detail/basic_iarchive.hpp(103) : error C2259: 'boost::archive::detail::basic_iarchiv e' : cannot instantiate abstract class due to following members: 'void boost::archive::detail::basic_iarchive::vload(boost::archive::tracking_type &)' : is a bstract .\boost/archive/detail/basic_iarchive.hpp(54) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_name_type &)' : is abstract .\boost/archive/detail/basic_iarchive.hpp(53) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_id_optional_type & )' : is abstract .\boost/archive/detail/basic_iarchive.hpp(52) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_id_type &)' : is a bstract .\boost/archive/detail/basic_iarchive.hpp(51) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::object_id_type &)' : is abstract .\boost/archive/detail/basic_iarchive.hpp(50) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::version_type &)' : is ab stract .\boost/archive/detail/basic_iarchive.hpp(49) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' .\boost/cstdint.hpp(179) : error C2143: syntax error : missing ';' before 'namespace' .\boost/cstdint.hpp(179) : error C4430: missing type specifier - int assumed. Note: C++ does not sup port default-int text_oarchive.cpp .\boost/archive/detail/basic_oarchive.hpp(98) : error C2259: 'boost::archive::detail::basic_oarchive ' : cannot instantiate abstract class due to following members: 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::tracking_type)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(60) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::class_name_type &) ' : is abstract .\boost/archive/detail/basic_oarchive.hpp(59) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::class_id_reference _type)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(58) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::class_id_optional_ type)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(57) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::class_id_type)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(56) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::object_reference_t ype)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(55) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::object_id_type)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(54) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::version_type)' : i s abstract .\boost/archive/detail/basic_oarchive.hpp(53) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' .\boost/cstdint.hpp(179) : error C2143: syntax error : missing ';' before 'namespace' .\boost/cstdint.hpp(179) : error C4430: missing type specifier - int assumed. Note: C++ does not sup port default-int xml_iarchive.cpp .\boost/archive/detail/basic_iarchive.hpp(103) : error C2259: 'boost::archive::detail::basic_iarchiv e' : cannot instantiate abstract class due to following members: 'void boost::archive::detail::basic_iarchive::vload(boost::archive::tracking_type &)' : is a bstract .\boost/archive/detail/basic_iarchive.hpp(54) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_name_type &)' : is abstract .\boost/archive/detail/basic_iarchive.hpp(53) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_id_optional_type & )' : is abstract .\boost/archive/detail/basic_iarchive.hpp(52) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_id_type &)' : is a bstract .\boost/archive/detail/basic_iarchive.hpp(51) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::object_id_type &)' : is abstract .\boost/archive/detail/basic_iarchive.hpp(50) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::version_type &)' : is ab stract .\boost/archive/detail/basic_iarchive.hpp(49) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' .\boost/cstdint.hpp(179) : error C2143: syntax error : missing ';' before 'namespace' .\boost/cstdint.hpp(179) : error C4430: missing type specifier - int assumed. Note: C++ does not sup port default-int xml_oarchive.cpp

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[string_algo] case insensitive compare
by Ovanes Markarian 08 Apr '08

08 Apr '08

Hello *, I have a question regarding string comparisons. Are the comparisons below suppose to work in VC 7.1 boost 1.34.0? Case 1: bool is_test_string(std::string const& str) { std::string const& compare_with=std::string("test_string"); boost::algorithm::is_iequal comparator; return comparator(str, compare_with); } Case 2: bool is_test_string(std::string const& str) { char const* compare_with = "test_string"; boost::algorithm::is_iequal comparator; return comparator(str, compare_with); } Case 3: bool is_test_string(std::string const& str) { boost::algorithm::is_iequal comparator; return comparator(str, "test_string"); } In all 3 cases I receive compiler erros. Many thanks, Ovanes

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