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i18n
by Olaf Peter 09 Apr '08

09 Apr '08

Hi, what would be the best approach for a new software project running on unix/win/osx regards to i18n? As may point of view there are gettext using with boost.format or gnu::autosprintf. What would be the adavantages/disadvantages of these? Any experience, other possibilities? Thanks, Olaf

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[asio] Implementation of multi-threaded support
by Yang Zhang 09 Apr '08

09 Apr '08

Hi - at least on Linux, how does boost asio implement multithreaded support for io::run? Is there a single thread blocking on select() (which I believe isn't thread-safe given the same sets), which others interrupt (EINTR) via pipes? Thanks for any explanation!

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[boost-users] Windows Installer for Boost 1.35.0
by Klaim 09 Apr '08

09 Apr '08

Hello, I'd like to know if an installer for boost 1.35.0 is planned? Currently only 1.34.1 and previous versions of the installer are provided on the boost-consulting website.

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[python] howto expose iterator / range with parameter?
by Jörg Becker 09 Apr '08

09 Apr '08

Hello, I want to expose a begin and end method which takes one argument and returns an iterator as a python iterator. Here is an example: struct range_test { typedef std::list< int > my_type; typedef my_type::iterator iterator; my_type m_vals; my_type::iterator begin ( int i ) { return m_vals.begin(); } my_type::iterator end ( int i ) { return m_vals.end();} }; class_< range_test >( "range_test" ) .def( "get_iter", range( &range_test::begin, &range_test::end ) ) ; If I import this, python exists immediately without any error message. Trying it with wrappers, I get a (gcc) compile error saying my wrapper function is not a class, struct, or union type: range_test::iterator begin( range_test & t, int i ) { return t.begin( i ); } range_test::iterator end( range_test & t, int i ) { return t.end( i ); } class_< range_test >( "range_test" ) .def( "get_iter", range( &range_test::begin, &range_test::end ) ) .def( "iter_wrapper", range( begin, end ) ) ; So I'm wondering how to expose such iterators, e.g. a method taking a predicate and returning a filter_iterator. Thanks for any help Jörg

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[serialzation] Portable binary archives
by Daniel Oberhoff 09 Apr '08

09 Apr '08

Hi, I was just wondering if there is any chance of having portable binary archives soon again, or to which version of boost I have to revert to use those in the vault. I am just asking as I want to javatize some of my work for another project, and I would like to use boost binary archives for portable serialization (portability of the data is really vital for this project). Best Daniel

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[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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