May 2012 - Boost-users - lists.preview.boost.org

[msm] euml submachine with non-default constructor
by squiremyrkle＠fastmail.fm 17 May '12

17 May '12

Hello, having trouble getting this to work. Here’s a simplification of what I’m trying: //states and events defined elsewhere struct sub_fsm : public msm::front::state_machine_def<sub_fsm, state_base> { typedef entry_state_impl initial_state; BOOST_MSM_EUML_DECLARE_TRANSITION_TABLE(( entry_state + some_event() / action1 == next_state ), transition_table) sub_fsm() : pctx_(nullptr) {} sub_fsm(context *p) : pctx_(p) {} context *pctx_; }; typedef msm::back::state_machine<sub_fsm> sub_helper; struct sub_machine : public sub_helper, public msm::front::euml::euml_state<sub_helper> { sub_machine() {} sub_machine(context *p) : sub_helper(p) {} }; sub_machine const sub; struct outer_fsm : public msm::front::state_machine_def<outer_fsm, state_base> { typedef outer_entry_state_impl initial_state; BOOST_MSM_EUML_DECLARE_TRANSITION_TABLE(( outer_entry_state + another_event() / action2 == sub ), transition_table) outer_fsm() : pctx_(nullptr) {} outer_fsm(context *p) : pctx_(p) {} context *pctx_; }; typedef msm::back::state_machine<outer_fsm> outer_machine; int main() { context ctx; outer_machine fsm(msm::back::states_ << sub_machine(&ctx), &ctx); } This doesn’t compile under VC2010, it can’t deduce the template arguments for operator <<(). Am I on the right track here? Should the template parameter of euml_state<> really be sub_helper and not sub_machine (I got that chunk of code from here: http://svn.boost.org/svn/boost/trunk/libs/msm/doc/HTML/examples/CompositeTu… What am I doing wrong? Thanks for any help, Mark -- http://www.fastmail.fm - Choose from over 50 domains or use your own

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[bimap] How to erase a single association in a many-to-many bimap?
by Vicente J. Botet Escriba 17 May '12

17 May '12

Hi, I have a bimap typedef bimap< multiset_of< tagged< Person*, consultant> >, multiset_of< tagged< Company*, client> >, with_info< tagged< ConsultancyContract*, contract> > > Consultancy; initialized as follows Consultancy consultancy; Person John("John"), Jane("Jane"); Company Dell("Dell"), HP("HP"); ConsultancyContract JohnContractD(10,1); ConsultancyContract JaneContractD(20, 2); ConsultancyContract JaneContractH(30, 3); consultancy.insert(Consultancy::value_type(&Jane, &Dell, &JaneContractD)); consultancy.insert(Consultancy::value_type(&Jane, &HP, &JaneContractH)); and I want to remove only the specific association Jane<->Dell and so I'm using consultancy.erase(Consultancy::value_type(&Jane, &Dell)); but then the resulting consultancy bimap is empty, while I expect the association Jane<->HP to be there yet. If I add before erasing consultancy.insert(Consultancy::value_type(&John, &Dell, &JohnContractD)); and then consultancy.erase(Consultancy::value_type(&Jane, &Dell)); all the associations concerning Jane are removed. What I'm doing wrong? How to erase a single association? Best, Vicente

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[container] scoped_allocator_adaptor for c++03 error
by Szymon Gatner 17 May '12

17 May '12

Hi, are new scoped allocators suppose to be supported by c++03 compilers? Just including scoped_allocator.hpp in VC2008 SP1 causes lots of erros due to variadic templates usage. Regards, Szymon Gatner

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[boost] Boost.Locale on mobile
by Klaim - Joël Lamotte 17 May '12

17 May '12

Hi, are there limitations in boost.locale that would prevent it's use on mobile platforms? For example: iOS, Android, other mobile platforms that allow native applications Or put in another way: are there known system limitations on some target platforms that prevent the use of all features of Boost.Locale or even forbid it's use? My current understanding is that there is no restriction, but as I am not an expert in this matter I prefer to ask more experienced users. Joel Lamotte

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Status of boost.lockfree
by niXman 16 May '12

16 May '12

Hello! Last update on git[1] - 6 months ago. I do not understand whether boost.lockfree is still developing? After reading this topic[2], I still do not understand whether boost.lockfree be accepted into the boost, and when to expect this? Will boost.lockfree be accepted into boost-1.50? [1] http://tim.klingt.org/git?p=boost_lockfree.git; [2] http://lists.boost.org/Archives/boost/2012/03/191491.php -- Regards, niXman

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unique_future without rvalue references
by John M. Dlugosz 16 May '12

16 May '12

I'm using Clang on the Mac without the C++11 dialect enabled in this project. With BOOST_NO_RVALUE_REFERENCES defined, in Boost 1.49, how can I write a function returning an object of type unique_future<T> ? I tried changing std::move to boost::move which I expected to work. I tried fiddling with thread_move_t explicitly. I can't get anything to work. What's the magic formula?

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segmentation fault using boost asio in linux.
by mozdemir 16 May '12

16 May '12

Hi, I am using Boost Asio and hitting a segmentation fault crash in ubuntu. I don't have any issue when this is run in the windows. it runs and after half an hour, it hits this crash. Below is the code that starts from beginning to the place that the segmentation fault happened. The interesting part is that I use io_strand all over the code and I don't see any thread-safety issue. In the program I use 2 threads that run the worker io_servece.run(). I also put some printf in the HandleSend() just before the crash. i can see that itr pointer is not valid even though m_pending_sends has one element in the list that is supposed to be this itr pointer. What could be wrong here? Thanks a lot, mustafa 06:49.20 [dbg] void Connection::HandleSend() itr size: 2869978912 m_pending_sends.size(): 1 void Connection::Start() { m_stopped = false; m_start_time = boost::posix_time::second_clock::local_time(); boost::system::error_code ec; boost::asio::ip::tcp::resolver resolver( m_hive->GetService() ); boost::asio::ip::tcp::resolver::query query( m_host, boost::lexical_cast< std::string >( m_port ) ); boost::asio::ip::tcp::resolver::iterator endpointIterator = resolver.resolve( query ); Connect(endpointIterator); return; } void Connection::Connect(tcp::resolver::iterator endpoint_iter) { LDBG_ << "void Connection::Connect()-1 symbol: " << m_symbol; if (endpoint_iter != boost::asio::ip::tcp::resolver::iterator()) { boost::asio::ip::tcp::endpoint endpoint = *endpoint_iter; m_socket.async_connect( endpoint, m_io_strand.wrap( boost::bind( &Connection::HandleConnect, shared_from_this(), boost::asio::placeholders::error, endpoint_iter ) ) ); } else { Stop(); } return; } void Connection::HandleConnect( const boost::system::error_code & error, boost::asio::ip::tcp::resolver::iterator endpoint_iterator ) { LDBG_ << "void Connection::HandleConnect()-1 symbol: " << m_symbol << " error: " << error << " HasError " << HasError() << " m_hive->HasStopped() " << m_hive->HasStopped(); if ( error || HasError() || m_hive->HasStopped() ) { StartError( error ); } else { if ( m_socket.is_open() ) { OnConnect( m_path ); } else { Connect(++endpoint_iterator); } } return; } void MyConnection::OnConnect( const std::string & host, uint16_t port, const std::string & path ) { Recv(); Send(); } void Connection::Send() { if (m_stopped) return; std::string str = "GET " + m_path + " HTTP/1.0\r\n\r\n"; str += "Host: " + m_host + "\r\n"; str += "Accept: */*\r\n"; str += "Connection: keep-alive \r\n\r\n"; std::vector< uint8_t > request; std::copy( str.begin(), str.end(), std::back_inserter( request ) ); m_io_strand.post( boost::bind( &Connection::DispatchSend, shared_from_this(), request ) ); // start the heartbeat timer for the next send msg. StartTimerHeartbeat(); return; } void Connection::DispatchSend( std::vector< uint8_t > buffer ) { bool should_start_send = m_pending_sends.empty(); m_pending_sends.push_back( buffer ); if ( should_start_send ) { StartSend(); } return; } void Connection::HandleSend( const boost::system::error_code & error, std::list< std::vector< uint8_t > >::iterator itr ) { if ( error || HasError() || m_hive->HasStopped() ) { StartError( error ); } else { OnSend( *itr ); if ( !m_pending_sends.empty() ) { m_pending_sends.erase( itr ); <<<<<<<<====== Segmentation Fault happens here StartSend(); } } return; } void Connection::StartSend() { if ( !m_pending_sends.empty() ) { boost::asio::async_write( m_socket, boost::asio::buffer( m_pending_sends.front() ), m_io_strand.wrap( boost::bind( &Connection::HandleSend, shared_from_this(), boost::asio::placeholders::error, m_pending_sends.begin() ) ) ); } return; } -- View this message in context: http://boost.2283326.n4.nabble.com/segmentation-fault-using-boost-asio-in-l… Sent from the Boost - Users mailing list archive at Nabble.com.

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[boost] [decimal] Proposed portable implementation ofstd::decimal
by Josh Quigley 16 May '12

16 May '12

Hi all. A first draft of this library is available at https://sourceforge.net/projects/stddecimal/ Runs on MSVC10 and gcc 4.6.3. Wraps the Intel implementation only, Until we resolve the licencing issue, top-level README contains detailed instructions about where to get 3rd party code and what to do with it. I'm keen on feedback on a particular point (although all feedback is of course welcome!): The current project can parse and execute the test cases maintained by Mike Cowlishaw from http://speleotrove.com/decimal/ (referred to as the Test Cases). To be completely clear, I also have normal, interface testing test cases, I am *not* talking about those below. - Question: How useful do people feel the Test Cases to be? I originally expected 99% of these tests to pass, but it turns out that most of them require: - The operands to be parsed and stored at the precision they appear in the Test Case file - The operation to be performed at precision of the operands - The high precision result to be rounded to the precision required by the Test Cases. - The test inputs to be parsed with correct rounding in underflow situations (not required by IEEE afaik) The above requirements are based on my experience with the tests - it is possible I'm making a blunder somewhere. Since the Test Cases are really testing the 3rd party library, an argument could be made they are not essential, or even desirable. I'm inclined to think they would be very, very nice to have, as they would give users a lot of confidence - I suspect user uptake would be poor without this confidence. So... what do people think? Regards, Josh.

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Why does boost::locale::generator fail for some locale codes?
by Adrián Chaves Fernández (Gallaecio) 15 May '12

15 May '12

I am using boost::locale::generator with its default backend (ICU I assume) to generate an std::locale. But for some reason, when I pass certain locale codes to the generator, it fails and the application execution is interrupted with the following output messages: terminate called after throwing an instance of 'boost::locale::conv::conversion_error' what(): Conversion failed Abortado I have tested the following values: * gl — FAILS * gl_ES — FAILS * gl_ES.utf8 — Works * en — Works * en_US — Works * en_US.utf8 — Works Installed locales should not be the issue: [user@localhost build]$ locale -a C en_US en_US.iso88591 en_US.utf8 galego galician gl_ES gl_ES@euro gl_ES.iso88591 gl_ES.iso885915@euro gl_ES.utf8 POSIX So why might this be happening?

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Re: [Boost-users] Why does boost::locale::generator fail for some locale codes?
by Ashish 15 May '12

15 May '12

Sent from my Verizon Wireless Phone "Adrián Chaves Fernández (Gallaecio) " <adriyetichaves(a)gmail.com> wrote: >I am using boost::locale::generator with its default backend (ICU I assume) to >generate an std::locale. But for some reason, when I pass certain locale codes >to the generator, it fails and the application execution is interrupted with >the following output messages: > > terminate called after throwing an instance of >'boost::locale::conv::conversion_error' > what(): Conversion failed > Abortado > >I have tested the following values: > >* gl — FAILS >* gl_ES — FAILS >* gl_ES.utf8 — Works >* en — Works >* en_US — Works >* en_US.utf8 — Works > >Installed locales should not be the issue: > > [user@localhost build]$ locale -a > C > en_US > en_US.iso88591 > en_US.utf8 > galego > galician > gl_ES > gl_ES@euro > gl_ES.iso88591 > gl_ES.iso885915@euro > gl_ES.utf8 > POSIX > >So why might this be happening? >_______________________________________________ >Boost-users mailing list >Boost-users(a)lists.boost.org >http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Boost/Asio short read error
by Marcin Głogowski 15 May '12

15 May '12

Hi, I have problem with Boost/asio - sometimes server returns "short read" error. I'm using client/server from the examples. Please write me - is it a bug or just wrong implemented example because the error occurs not every time. How to protect my application against the error? Best regards, Marcin Głogowski Dom Maklerski Banku Ochrony Środowiska Spółka Akcyjna ul. Marszałkowska 78/80 / 00-517 Warszawa wpisana w Rejestrze Przedsiębiorców prowadzonym przez Sąd Rejonowy dla m. st. Warszawy XII Wydział Gospodarczy Krajowego Rejestru Sądowego pod numerem: KRS 0000048901 / NIP 526-10-26-828 Kapitał zakładowy w wysokości 21.551.200zł wpłacony w całości. P - Nie drukuj tej wiadomości, jeśli to nie jest konieczne.

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boost::asio The semaphore timeout period has expired
by Markus Bonk 15 May '12

15 May '12

Hi, I am getting a timeout "The semaphore timeout period has expired" from async_read_some which I do not want. What is causing it - ok, it could be that I am not receiving anything and how do I configure it? Markus

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communicate with GSM MODEM
by Evaggelos Tsampazis 15 May '12

15 May '12

Hi Everyone! I would like to ask if someone knows how to use in detail the serial_port() mechanism. I want to create an API application where I will send SMS messages from the pc instead of the mobile phone/gsm modem. Of course, the mobile phone will be connected to the PC from a com or tty serial port. Despite that, I would also like to receieve the inbox from the mobile device. By other words, I need a way to send AT commands to my gsm device and then after receieve the answer. How can that be made easy? Thanks Evaggelos

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Using BoostTest to run unit tests multiple times without quitting test runner
by Pankaj 15 May '12

15 May '12

I want to use Boost Test to run unit tests multiple times without quitting the test runner. Here is the pseudo-code to demonstrate what I want to do: void main() { for(int i = 0; i < 10; ++i) { char *arguments[] ={ "MyApplication.exe", "--detect_memory_leak=0" }; boost::unit_test::unit_test_main( &init_function, 2, arguments); } } The first time unit_test_main is called, all the boost tests run fine but in the second iteration, boost test throws an exception. I looked at the internal code and found that framework is initialized everytime unit_test_main is called and if framework is already initialized, boost test doesn't like initializing framework again. Please let me know if there is any way to run units test multiple times without quitting test runner. -- View this message in context: http://boost.2283326.n4.nabble.com/Using-BoostTest-to-run-unit-tests-multip… Sent from the Boost - Users mailing list archive at Nabble.com.

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Re: [Boost-users] [mpl] cross product and gcc specific compiler error
by Josh Quigley 14 May '12

14 May '12

Aaaaaaaaaaaaah! Thanks a lot! Regards, Josh. > > It doesn't work because you're relying on > implementation details. Use boost::mpl::at_c<XXX, 0>::type > instead of XXX::item0. > > ... SNIP... > > In Christ, > Steven Watanabe

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boost::bind and Motif
by Sven Bauhan 14 May '12

14 May '12

Hi, I just tried to use boost::bind to create a function pointer from an object method to define it as a Motif callback function: class AnimationController { public: void timerCB( XtPointer, XtIntervalId* ); void startTimer() { this->mTimeout = XtAppAddTimeOut( this->mAppContext, ANIMATION_TIMESTEP, boost::bind( &AnimationController::timerCB, this ), NULL ); } ... }; For the definition of the Motif function: XtIntervalId XtAppAddTimeOut( XtAppContext /* app_context */, unsigned long /* interval */, XtTimerCallbackProc /* proc */, XtPointer /* closure */ ); with typedef void (*XtTimerCallbackProc)( XtPointer /* closure */, XtIntervalId* /* id */ ); But I get the following error: ../AnimationController.cpp: In member function 'void geo::AnimationController::startTimer()': ../AnimationController.cpp:193: error: cannot convert 'boost::_bi::bind_t<void (&)(void*, XtIntervalId*), boost::_mfi::dm<void ()(void*, XtIntervalId*), geo::AnimationController>, boost::_bi::list1<boost::_bi::value<geo::AnimationController*> > >' to 'void (*)(void*, XtIntervalId*)' for argument '3' to 'XtIntervalId XtAppAddTimeOut(_XtAppStruct*, long unsigned int, void (*)(void*, XtIntervalId*), void*)' Can someone explain, what I did wrong? Thanks, Sven

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[Intrusive] Cleaning up trailing white space
by Brian Wood 14 May '12

14 May '12

>From what I can tell a lot of Boost libraries would benefit from this, but in particular I want this for the Intrusive library. It helps to improve compile times and reduce the space needed by Boost. I used grep " $" * to help with that here. Shalom, Brian Wood Ebenezer Enterprises http://webEbenezer.net

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(GCC) 4.6.3 and boost_1_47_0 lockfree issue
by Shailja Kumari 14 May '12

14 May '12

Hi All, I am using boost_1_47_0 and (GCC) 4.6.3. The C++ application on linux complains on the following in linking. boost_1_47_0/boost/lockfree/detail/freelist.hpp:124: undefined reference to `std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node> >::operator boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>() const' /boost_1_47_0/boost/lockfree/detail/freelist.hpp:124: undefined reference to `std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node> >::operator boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>() const' collect2: ld returned 1 exit status I looked into http://tim.klingt.org/code/projects/boost-lockfree/repository/revisions/423… and dowloaded lockfree changed files. But the issue still exists. boost_1_47_0/boost/lockfree/detail/freelist.hpp:117: undefined reference to `std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node> >::compare_exchange_weak(boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>&, boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>, std::memory_order)' boost_1_47_0/boost/lockfree/detail/freelist.hpp:87: undefined reference to `std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node> >::load(std::memory_order) const' boost_1_47_0/boost/lockfree/detail/freelist.hpp:124: undefined reference to `std::atomic<boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node> >::operator boost::lockfree::detail::tagged_ptr<boost::lockfree::detail::freelist_node>() const' Any idea on this ?

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Re: [Boost-users] [mpl] cross product and gcc specific compiler error
by Josh Quigley 14 May '12

14 May '12

Hi, I grabbed an mpl cross product implementation (product_view) of this mailing list. It works fine in MSVC but fails in gcc: // typedef boost::mpl::vector<decimal32, decimal64, decimal128> DecimalTypes; // Original typedef boost::mpl::vector<float, double, long double> DecimalTypes; // for demonstration typedef boost::mpl::vector<int, unsigned int, long, unsigned long, long long, unsigned long long> IntegralTypes; typedef product_view<boost::mpl::vector<DecimalTypes, IntegralTypes> > EachDecimalWithEachIntegralT; BOOST_AUTO_TEST_CASE_TEMPLATE(MyTest, DecimalIntegralT, EachDecimalWithEachIntegralT) { { typename DecimalIntegralT::item1 r(1234567); // Fails on gcc: no type named ‘item0’ in ‘struct boost::mpl::v_item<long long unsigned int, boost::mpl::v_item<ext::decimal::decimal128, boost::mpl::vector0<mpl_::na>, 0>, 0> typename DecimalIntegralT::item0 d(r); BOOST_CHECK_EQUAL(static_cast<long long>(d), r); } } A complete listing is below. I'm wondering if there is just something simple that needs to be tweaked? The thing that has me really stumped is the type exsits in MSVC, so I'm at a bit of loss of how to proceed debugging. Any help appreciated! // // LISTING // #include <boost/mpl/vector.hpp> #include <boost/mpl/if.hpp> #include <boost/mpl/at.hpp> #include <boost/mpl/copy.hpp> #include <boost/mpl/transform.hpp> #include <boost/type_traits/is_same.hpp> #include <boost/function.hpp> #include <boost/mpl/vector.hpp> #include <boost/mpl/list.hpp> #include <boost/mpl/joint_view.hpp> #include <boost/test/unit_test.hpp> namespace detail { using boost::mpl::at_c; using boost::mpl::at; using boost::mpl::vector3; using boost::mpl::true_; using boost::mpl::false_; using boost::mpl::if_; using boost::mpl::next; using boost::mpl::bool_; using boost::mpl::front_inserter; using boost::mpl::clear; using boost::mpl::forward_iterator_tag; using boost::mpl::reverse_copy; using boost::mpl::transform1; using boost::mpl::deref; using boost::mpl::_1; using boost::mpl::_2; using boost::mpl::int_; using boost::mpl::fold; using boost::mpl::or_; using boost::mpl::nested_begin_end_tag; template<typename S, typename O> struct state_with_overflow { typedef S state; typedef O overflow; }; template<typename I3S> struct i3s_increment_inserter { template<typename I3, typename O> struct i3_ { typedef I3 i3; typedef O overflow; }; template<typename I3> struct incr_ { typedef typename next< typename at_c< I3, 1 >::type >::type next_; typedef bool_< boost::is_same< next_, typename at_c<I3,2>::type >::value > overflow_; typedef i3_< vector3< typename at_c<I3,0>::type, typename if_< overflow_, typename at_c<I3,0>::type, next_ >::type, typename at_c<I3,2>::type >, overflow_ > type; }; typedef front_inserter< typename clear<I3S>::type > base_; typedef state_with_overflow< typename base_::state, true_ > state; struct operation { template<typename S, typename I3> struct apply { typedef typename if_< typename S::overflow, typename incr_<I3>::type, i3_<I3,false_> >::type next_; typedef state_with_overflow< typename base_::operation::template apply< typename S::state, typename next_::i3 >::type, typename next_::overflow > type; }; }; }; template< typename SWO > struct product_iterator { private: typedef typename SWO::state I3S; public: typedef forward_iterator_tag category; typedef typename transform1< I3S, deref< at< _1, int_<1> > > >::type type; typedef product_iterator< typename reverse_copy< I3S, i3s_increment_inserter<I3S> >::type > next; }; template<typename S> struct product_view { private: typedef typename transform1< S, vector3< boost::mpl::begin<_1>, boost::mpl::begin<_1>, boost::mpl::end<_1> > >::type begin_impl; typedef typename fold< S, false_, or_< _1, boost::is_same< boost::mpl::begin<_2>, boost::mpl::end<_2> > // empty<_2> refuses to compile on MSVC 7.1 > >::type empty_result; public: typedef nested_begin_end_tag tag; typedef product_iterator< state_with_overflow< begin_impl, empty_result > > begin; typedef product_iterator< state_with_overflow< begin_impl, true_ > > end; }; } using detail::product_view; // typedef boost::mpl::vector<decimal32, decimal64, decimal128> DecimalTypes; // Original typedef boost::mpl::vector<float, double, long double> DecimalTypes; // for demonstration typedef boost::mpl::vector<int, unsigned int, long, unsigned long, long long, unsigned long long> IntegralTypes; typedef product_view<boost::mpl::vector<DecimalTypes, IntegralTypes> > EachDecimalWithEachIntegralT; BOOST_AUTO_TEST_CASE_TEMPLATE(MyTest, DecimalIntegralT, EachDecimalWithEachIntegralT) { { typename DecimalIntegralT::item1 r(1234567); // Fails on gcc: no type named ‘item0’ in ‘struct boost::mpl::v_item<long long unsigned int, boost::mpl::v_item<ext::decimal::decimal128, boost::mpl::vector0<mpl_::na>, 0>, 0> typename DecimalIntegralT::item0 d(r); BOOST_CHECK_EQUAL(static_cast<long long>(d), r); } }

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Boost.Filesystem (?): How to get the platform-specific path separator (not directory separator) ?
by Johannes Stallkamp 14 May '12

14 May '12

Hi all, Boost.Filesystem eases use of path names across platforms w.r.t to the directory separator (slash vs. backslash, as I am only concerned with Linux <-> Windows). Now, I need to handle _lists_ of path names (in an environment variable). Is there a similar transparent way a) to automatically handle or b) access os-specific _path_ separators (colon vs. semicolon) in Boost.Filesystem or Boost in general? In other words, I am looking for the Boost (well, C++) equivalent of Pyhton's os.pathsep, Java's path.separator or PHP's PATH_SEPARATOR. And I am looking for a library function/constant rather than a self-implemented platform-dependent preprocessor directive. The only C++-solution I am currently aware of is "apr_filepath_list_merge"/"apr_filepath_list_split" in Apache Portable Runtime (as mentioned in this answer to my question on stackoverflow: (http://stackoverflow.com/a/10514401/1228449) Is there a similar way in Boost? Kind regards Johannes

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Building boost with a locally built g++
by Mark Summerfield 14 May '12

14 May '12

Hi, I have two locally built g++'s and want to build boosts to go with them. Unfortunately I've never used jam and despite reading the docs haven't succeeded. I created a user-config.jam file with the single line: using gcc : 4.7 : /home/mark/opt/gcc47/bin/g++ : <compileflags>-std=c++11 -pedantic <linkflags>-lstdc++ -lpthread -L/home/mark/opt/gcc47/lib -L/home/mark/opt/gcc47/lib64 <address-model>64; but this seems to be ignored. All I want to do is build boost for my local g++ 4.6 in ~/opt/gcc46 and my local g++ 4.7 in ~/opt/gcc47. Can anyone give me or point me to some simple instructions for doing this? I did not find http://www.boost.org/doc/libs/1_49_0/more/getting_started/unix-variants.html at all helpful for my situation. In particular, section 5.2 didn't help and b2 just keeps using the system's /usr/bin/g++. (I want boost primarily for its regex library.) Thanks! PS I'm not a subscriber so would appreciate being cc'd in any reply. -- Mark Summerfield, Qtrac Ltd, www.qtrac.eu C++, Python, Qt, PyQt - training and consultancy "Programming in Go" - ISBN 0321774639 http://www.qtrac.eu/gobook.html

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[build] How do I get my trial project to use b2 correctly?
by Daryle Walker 13 May '12

13 May '12

I'm trying out GitHub for the first time. I have a new project thatis supposed to reference my Boost-SVN tree for both the Boostheaders and its build system. I copied the project structure,including Jamfiles, from John Maddock's Multiprecision trial library.I don't think I did it right because calling "b2" doesn't do anything.At first, I got directory errors because it couldn't find my Boost tree.(The "../Trunk" alias doesn't work. Is it because I'm an extradirectory away?) Then I defined "BOOST" in my shell, so "b2" canfind the tree. I just get "1 target found" notices without anythinghappening. I know nothing's being compiled because I called it fortool-sets that aren't C++11-enabled and the build just ends withouterror on my C++11 code. My directories are like: + MyProjects++ boost-trunk++ Trunk (aliased to "boost-trunk")++ Unionize (a Git clone of my project on GitHub) Does anyone want to take a look and see how I have to fix my buildfiles? The project is at "https://github.com/CTMacUser/Unionize". Daryle W.

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Interprocess file mapping - fixed addresses
by Steve 13 May '12

13 May '12

I hope someone on this list is sufficiently familiar with file_mapping, mapped_region and "Fixed Address Maping" to be able to offer advice. I have a very large file, and I want to map pairs of system-page-sized blocks from it into memory. The catch: I want to map non-consecutive blocks from the file into consecutive memory addresses. For example, with block 42 mapped to BASE_ADDRESS, I might want block 7 mapped to BASE_ADDRESS+PAGE_SIZE. Under Linux, using mmap() directly, I can use one of two approaches: 1. I can map two pages from the first file-block-start-location, then map one block from the second, using MAP_FIXED, at the address returned by the first mapping plus one page. 2. I could map two pages of /dev/zero - then map the first and second pages explicitly using MAP_FIXED into that address space - this copes with the case where the first block in memory is the last block of the file, but has an overhead. Both approaches seem to work, though I've not done extensive testing. I'd prefer to avoid using mmap directly - both to gain the advantages of a well-tested library using high-level C++ idioms - and to compile cross-platform... definitely targeting Linux and Windows - but maybe other platforms too. When I attempt to use the above strategy, I get a boost::interprocess_exception::library_error - though I'm not sure why. The following code fails on both Linux and Windows: -- size_t page_size=mapped_region::get_page_size(); file_mapping m("file.dat", read_write); mapped_region ra(m,read_write,0,2*page_size); uint8_t *base=reinterpret_cast<uint8_t*>(ra.get_address()); mapped_region rb(m,read_write,2*page_size,page_size,base+page_size); //FAILS -- whereas, the following appeared to work under Windows 7 (but not Linux) - perhaps by fluke of the way address space was allocated: -- size_t page_size=mapped_region::get_page_size(); file_mapping m("file.dat", read_write); mapped_region ra(m,read_write,0,page_size); // N.B. Map 1 page only uint8_t *base=reinterpret_cast<uint8_t*>(ra.get_address()); mapped_region rb(m,read_write,2*page_size,page_size,base+page_size); -- The documentation seems focused on MAP_FIXED being used to map specific data in a file into the same memory address on every invocation - with the obvious reference to validity of pointers referencing the mapped address space. Pointers are not a problem for me - my file contains no pointers - just a long stream of application-specific values. I only need to explicitly control two pages to be mapped into contiguous memory - I can be flexible about the mapped base address for the pair of pages - and it doesn't matter if different addresses are chosen on successive invocations.. as long as, in memory, the byte following the last byte of the first page is the first byte of the second page for an arbitrary pair of pages... irrespective of the locations of those pages in the file. Is this a use case that boost::interprocess intends to support? What is the most appropriate, robust, platform independent, way to reserve address space in order map into fixed addresses to ensure contiguous mappings? Do I need to mmap /dev/zero for POSIX systems - and use VirtualAlloc with MEM_RESERVE on Windows myself in order to use fixed-address memory mapping of files? Does boost offer anything to make this platform independent - or am I 'on my own'?

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NaN and lexical_cast
by Claude 13 May '12

13 May '12

Hi! It is possible to convert the "nan" string in a Non a Number floating point value using lexical_cast? -- View this message in context: http://boost.2283326.n4.nabble.com/NaN-and-lexical-cast-tp4630035.html Sent from the Boost - Users mailing list archive at Nabble.com.

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boost::asio::ip::tcp::resolver::query does not work in Ubuntu!!!
by mozdemir 13 May '12

13 May '12

Hi, I am a newbie with Asio library and i got into crashing problem with the following code: boost::system::error_code ec; boost::asio::ip::tcp::resolver resolver( m_hive->GetService() ); boost::asio::ip::tcp::resolver::query query( m_host, boost::lexical_cast< std::string >( m_port )); boost::asio::ip::tcp::resolver::iterator endpointIterator = resolver.resolve( query ); When i run this in windows, i do not have any isssue but in Ubuntu, it works and after some more resolution of query, it crashes. I did install Miredo to activate Ipv6 but it did not help. When the crash happens, i see this: 23:37.47 [dbg] [0x8ec0650] Exception: Host not found (authoritative) 23:37.47 [dbg] [0x8ec0650] Exception: Host not found (authoritative) terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >' what(): Host not found (authoritative) Aborted (core dumped) Do you know what else is missing or what is wrong? Thanks a lot, mustafa -- View this message in context: http://boost.2283326.n4.nabble.com/boost-asio-ip-tcp-resolver-query-does-no… Sent from the Boost - Users mailing list archive at Nabble.com.

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