August 2011 - Boost-users - lists.preview.boost.org

Cannot get Wave + Spirit Compile
by Alexander Feldman 29 Aug '11

29 Aug '11

Hi, I have (I suppose) a beginner problem -- cannot make wave + spirit compile. I think there is an iterator problem but I cannot understand the compiler error. I am attaching a small example and the error output - can somebody explain how to fix this? I have searched around a lot but can't find an answer to that. Thanks, -- Alex

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[math][tools][units] generic libraries not generic enough
by alfC 29 Aug '11

29 Aug '11

Hi, Lately I am using Boost.Units quite intensively for defining lots of thermodynamic functions. The other day I needed a root finding algorithm that can work on one of these functions. I look at couple of libraries,and I ended up rolling and adaptor that adimensionalizes the function on Boost.Units quantities, etc, etc. Then I though, hey! we have Boost.Math tools, even root finding algorithms, and these functions are *very* generic as Boost is supposed to be. And I found the function: boost::math::tools::bracket_and_solve_root which has the perfect underlying algorithm for the application. I started programming and after several compilation errors I realized that, as happened before, the functions are not generic enough. For example the arguments are bracket_and_solve_root( F f, const T& guess, const T& factor, bool rising, Tol tol, boost::uintmax_t& max_iter); in my case "guess" is an argument type of type boost::units::quantity<si::meter> but then "factor" has to be a *different* type. For this function to be generic one need that factor is of new type parameter. In my opinion the function should be template<typename F, typename T, typename Fact, typename Tol> bracket_and_solve_root( F f, const T& guess, const T& factor, bool rising, Tol tol, boost::uintmax_t& max_iter); to begin with (and then there is a chain of other internal changes). What do you think? should I open a bug ticket? Let's put it in more abstract way: T*T=T should not be a requirement for a root algorithm to work. Once and for all, can we give a name to the model type of which Boost.Units quantity models for? so the library writers stop assuming that T*T=T for numeric values and can improve half-way generic libraries? Other numeric libraries that suffer from this deficiency are Boost.Accumulators, Boost.Geometry, and Boost.Interval among the ones I tried. I think this issues should be addressed, not only to make them work with Boost.Units but also to bring those libraries to a higher level of generality. Just an opinion. Thank you, Alfredo

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Regarding boost.python build on windows 7 (64 bit) VC9.0
by Nori Vasudeva Pavan Kumar 29 Aug '11

29 Aug '11

Hi I am trying to develop some python applications which use boost.python extensions. I am very new to both VC and Boost. I am able to compile boost.python following the help i found out in google. But I am not able to build my dll library linking with boost libraries. I am not able to figure out what and all going wrong. If I make it static library to be generated, the code builds but my python script is not able to import the library. Could you please direct me to a link where I can find solutions to all the problems regarding building and developing applications using boost.python. Regards, Vasudev

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[chrono] using user + system process cpu time
by Julian Gonggrijp 28 Aug '11

28 Aug '11

Dear Chrono maintainers, Here's what I'd like to do: #include <boost/chrono.hpp> namespace bcr = boost::chrono; typedef bcr::process_cpu_clock clock; bcr::milliseconds foo ( ) { clock::time_point start = clock::now(); // run a test clock::time_point end = clock::now(); return (end.user() - start.user()) + (end.sys() - start.sys()); } However, it seems (from the manual) that bcr::process_cpu_clock doesn't provide an interface for retrieving the individual user and system components (except by passing it through a std::stringstream, but that's cumbersome). The only alternative that I can think of is to use bcr::process_user_cpu_clock and bcr::process_system_cpu_clock separately, like this: typedef bcr::process_user_cpu_clock uclock; typedef bcr::process_system_cpu_clock sclock; bcr::milliseconds foo ( ) { uclock::time_point ustart = uclock::now(); sclock::time_point sstart = sclock::now(); // run a test uclock::time_point uend = uclock::now(); sclock::time_point send = sclock::now(); return (uend - ustart) + (send - sstart); } But the latter approach is less elegant and I'm afraid that the result might be less reliable. Could you please advice me on the best way to find both the user and system components of the process cpu time taken by a piece of code? Thanks in advance, -Julian

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[MSM] looking for a recursive get_state_name
by Jan Vogelgesang 28 Aug '11

28 Aug '11

Hello, i'am looking for a way to get the names(s) of the innermost active state(s) of a MSM with composite states, e.g. for debugging purposes. In my application i use state machines with orthogonal regions and submachines. Currently i use code based on the example given for fill_state_names, see http://www.boost.org/doc/libs/1_47_0/libs/msm/doc/HTML/re02.html#d0e5385 It works well for for orthogonal regions. For for submachines only the name of the active submachine is returned. Instead i want the name of the innermost active state in each submachine. I already found 'recursive_get_transition_table', this seems to be a first step. But i don't know how to get the state id's on the path to innermost active state. Unfortunately i don't know much about boost::mpl, thus i'am a bit lost at the moment. Any suggestions on how to get the state id's on the path to the innermost active state? Or on a different approach to get the name of the innermost active state? Best regards, Jan

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[Boost][Test] Compile error with BOOST_REQUIRE_THROW
by Martin Desharnais 28 Aug '11

28 Aug '11

Hi, I've just found that we have a compiler error when using the BOOST_REQUIRE_THROW macro in a if/else statement with implicit block. Let's have an example: BOOST_AUTO_TEST_CASE(foo) { if(true) BOOST_REQUIRE_THROW(throw std::exception(), std::exception); else BOOST_REQUIRE_THROW(throw std::exception(), std::exception); } Will fail with: file.cpp: In member function ‘void foo::test_method()’: file.cpp:184:2: error: ‘else’ without a previous ‘if’ To make it work, we need to put explicit block: BOOST_AUTO_TEST_CASE(foo) { if(true) { BOOST_REQUIRE_THROW(throw std::exception(), std::exception); } else { BOOST_REQUIRE_THROW(throw std::exception(), std::exception); } } Wouldn't it be possible to add this block in the macro so library users don't have to care about? PS: Sorry for my writing, I'm not a native English speaker. -- Martin Desharnais martin.desharnais(a)gmail.com

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Reg : Boost Error - any.hpp
by Vijay 28 Aug '11

28 Aug '11

Hi, We are using boost version 1.31.0 in our C++ code. Our OS is HP-UX 11.31 Itanium. We use aCC compiler. While compiling my code, I'm getting the below error. Can any one help me to fix this issue ? "/opt/app/q1app2c4/boost-1.31.0/boost/any.hpp", line 125: error #2070: incomplete type is not allowed ValueType held; ^ detected during: instantiation of class "boost::any::holder<ValueType> [with ValueType=Fcif]" at line 32 instantiation of "boost::any::any(const ValueType &) [with ValueType=Fcif]" at line 35 of "/opt/app/q1app2c4/src/share/incl/Fcif.h" Cheers, Vijay....(V2K) E-mail to : v2k.sweet(a)gmail.com Catch me @ 9962003328, 7871181610 Blackberry PIN : 259943F3 "Life is just one grand sweet song, so start the music."

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language c
by Giordano Bruno 28 Aug '11

28 Aug '11

Does anyone recommend use boost preprocessor in c language for ARM development? Giordano

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Debugging openssl server and asio
by Allan Nielsen 27 Aug '11

27 Aug '11

Hi I'm trying to hack cpp-netlib to implement a https server. I have used the ssl server example from boost 1.46.1 which is working okay, but when I (think) I do the same thing in cpp-net lib I got this segmentation fault: #0 0x00007ffff7bbda57 in SSL_accept () from /usr/lib64/libssl.so.1.0.0 #1 0x00000000004c1702 in boost::network::http::sync_connection<boost::network::http::tags::http_server, handler>::socket (this=0x4d58ca) at /home/awn/git/buildroot5/git/gmbinit/test/cpp-netlib-0.9.2/boost/network/protocol/http/server/sync_connection.hpp:50 #2 0x00000000004d4e67 in boost::detail::function::function_invoker1<int (*)(SSL*), int, SSL*>::invoke (function_ptr=..., a0=0x731820) at /usr/include/boost-1_46/boost/function/function_template.hpp:95 #3 0x00000000004d0fd6 in boost::function1<int, SSL*>::operator() (this=0x73b490, a0=0x731820) at /usr/include/boost-1_46/boost/function/function_template.hpp:1013 #4 0x00000000004cde2f in boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >::start (this=0x73b490) at /usr/include/boost-1_46/boost/asio/ssl/detail/openssl_operation.hpp:149 #5 0x00000000004df1b3 in boost::_mfi::mf0<int, boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > >::operator() ( this=0x7fffffffc500, p=0x73b490) at /usr/include/boost-1_46/boost/bind/mem_fn_template.hpp:49 #6 0x00000000004dd693 in boost::_bi::list1<boost::_bi::value<boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >*> >::operator()<int, boost::_mfi::mf0<int, boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > >, boost::_bi::list0> (this=0x7fffffffc510, f=..., a=...) at /usr/include/boost-1_46/boost/bind/bind.hpp:243 #7 0x00000000004db687 in boost::_bi::bind_t<int, boost::_mfi::mf0<int, boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > >, boost::_bi::list1<boost::_bi::value<boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >*> > >::operator() (this=0x7fffffffc500) at /usr/include/boost-1_46/boost/bind/bind_template.hpp:20 #8 0x00000000004d980e in boost::asio::asio_handler_invoke<boost::_bi::bind_t<int, boost::_mfi::mf0<int, boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > >, boost::_bi::list1<boost::_bi::value<boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >*> > > > ( function=...) at /usr/include/boost-1_46/boost/asio/handler_invoke_hook.hpp:64 #9 0x00000000004d7b22 in boost_asio_handler_invoke_helpers::invoke<boost::_bi::bind_t<int, boost::_mfi::mf0<int, boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > >, boost::_bi::list1<boost::_bi::value<boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >*> > >, boost::_bi::bind_t<int, boost::_mfi::mf0<int, boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > >, boost::_bi::list1<boost::_bi::value<boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >*> > > > (function=..., context=...) at /usr/include/boost-1_46/boost/asio/detail/handler_invoke_helpers.hpp:39 #10 0x00000000004d5990 in boost::asio::detail::completion_handler<boost::_bi::bind_t<int, boost::_mfi::mf0<int, boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > > >, boost::_bi::list1<boost::_bi::value<boost::asio::ssl::detail::openssl_operation<boost::asio::basic_stream_socket<boost::asio::ip::tcp, boost::asio::stream_socket_service<boost::asio::ip::tcp> > >*> > > >::do_complete (owner=0x734c60, base=0x72fb80) at /usr/include/boost-1_46/boost/asio/detail/completion_handler.hpp:63 #11 0x00000000004ae40b in boost::asio::detail::task_io_service_operation::complete (this=0x72fb80, owner=...) at /usr/include/boost-1_46/boost/asio/detail/task_io_service_operation.hpp:35 #12 0x00000000004b3fb2 in boost::asio::detail::strand_service::do_complete (owner=0x734c60, base=0x7308e0) at /usr/include/boost-1_46/boost/asio/detail/impl/strand_service.ipp:98 #13 0x00000000004ae40b in boost::asio::detail::task_io_service_operation::complete (this=0x7308e0, owner=...) at /usr/include/boost-1_46/boost/asio/detail/task_io_service_operation.hpp:35 #14 0x00000000004b0449 in boost::asio::detail::task_io_service::do_one (this=0x734c60, lock=..., this_idle_thread=0x7fffffffc790) at /usr/include/boost-1_46/boost/asio/detail/impl/task_io_service.ipp:278 #15 0x00000000004aff97 in boost::asio::detail::task_io_service::run (this=0x734c60, ec=...) at /usr/include/boost-1_46/boost/asio/detail/impl/task_io_service.ipp:130 #16 0x00000000004b0841 in boost::asio::io_service::run (this=0x7fffffffc980) at /usr/include/boost-1_46/boost/asio/impl/io_service.ipp:57 #17 0x00000000004ac04b in main (arg=1, argv=0x7fffffffcb18) at /home/awn/git/buildroot5/git/gmbinit/test/serverTest.cxx:51 As the problem is in SSL_accept () i expect there is something wrong with my SSL context which I create like this: boost::asio::ssl::context context_(io_service, boost::asio::ssl::context::sslv23); context_.set_verify_mode(boost::asio::ssl::context::verify_none); context_.use_certificate_chain_file("/etc/ssl/gamblify/gamblify.cert"); context_.use_private_key_file("/etc/ssl/gamblify/gamblify.pem", boost::asio::ssl::context::pem); The context is created in my main function, and then passed around as a reference. The type of my socket is: boost::asio::ssl::stream<boost::asio::ip::tcp::socket> socket_; I create it like this: socket_(service_, context) Accept is using the lowest layer which I return like this boost::asio::ssl::stream<boost::asio::ip::tcp::socket>::lowest_layer_type& socket() { return socket_.lowest_layer(); } I call async_accept like this: new_connection.reset(new sync_connection<Tag,Handler>(service_, handler_, context_)); acceptor_.async_accept(new_connection->socket(), boost::bind(&sync_server_base<Tag,Handler>::handle_accept, this, boost::asio::placeholders::error)); The handler looks like this: void handle_accept(boost::system::error_code const & ec) { if (!ec) { new_connection->start(); new_connection.reset(new sync_connection<Tag,Handler>(service_, handler_, context_)); acceptor_.async_accept(new_connection->socket(), boost::bind(&sync_server_base<Tag,Handler>::handle_accept, this, boost::asio::placeholders::error)); } } Eventually the accept handler and it is running start which looks like this: void start() { std::cerr << "Running start" << std::endl; socket_.async_handshake(boost::asio::ssl::stream_base::server, boost::bind(&sync_connection<Tag,Handler>::handle_handshake, this, boost::asio::placeholders::error)); } Then at some point before I reach the handle_handshake I get an segmentation fault... Can any body see any problems with this, or just give some hints on how to debug this kind of bugs... -- Allan W. Nielsen

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[MSM] How to use is_flag_active inside on_entry ?
by Gábor Márton 27 Aug '11

27 Aug '11

Hi, I would like to use is_flag_active<SomeFlag>() function inside one of my state's on_entry template function: struct StBladeDown : public msm::front::state<> { template<class Event, class FSM> void on_entry(Event const& event, FSM& fsm) { if(fsm.is_flag_active<FlagMaster>()) { // ERROR // doSomeThing(); } } }; However I got the following compile error: StOk.hpp: In member function 'void mr::mrd::amfo::StOk_::StBladeDown::on_entry(const Event&, FSM&)': StOk.hpp:78: error: expected primary-expression before '>' token StOk.hpp:78: error: expected primary-expression before ')' token However outside of the state machine, I mean if I first declare a state machine, I can use the is_flag_active: StAMFODirector backEnd; backEnd.start(); processEvent(backEnd,EvBladeDown()); processEvent(backEnd,EvMaster()); if(backEnd.is_flag_active<FlagMaster>()){ // OK _LOG_DEBUG("Flag Master active"); } If I use the front_end's is_flag_ I get compiler error again (no such function in msm::back::state_machine). Any idea how to use is_flag_active together with on_entry? Or if it is not possible are there any alternatives? Thanks for any help, Gabor

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Re: [Boost-users] Simple serial port demonstration with boost asio asynchronous I/O
by jhodapp 27 Aug '11

27 Aug '11

Any reason why you can't use Ubuntu's package for Boost? Do you need the latest version of Boost? If you use the Ubuntu packages, you should have no issues as I was successfully able to run that example on my Ubuntu installation. On Aug 27, 2011, at 9:55 AM, drwho [via Boost] wrote: > New to boost. (Ubuntu 10.10) Downloaded boost 1.47 source. Built it with ./bootstrap.sh and ./b2 Keep getting linker failure, undefined reference to `boost::system::get_system_category() in my QT app. Tried your serial example from bash, same thing.... > > drwho@drwho-desktop:~/Projects/prog$ g++ -Lboost/stage/lib -lboost_system -lboost_thread serial.cpp -o test > /tmp/ccvTv9iN.o: In function `__static_initialization_and_destruction_0(int, int)': > serial.cpp:(.text+0x3cf): undefined reference to `boost::system::get_system_category()' > serial.cpp:(.text+0x3d9): undefined reference to `boost::system::get_generic_category()' > serial.cpp:(.text+0x3e3): undefined reference to `boost::system::get_generic_category()' > serial.cpp:(.text+0x3ed): undefined reference to `boost::system::get_generic_category()' > serial.cpp:(.text+0x3f7): undefined reference to `boost::system::get_system_category()' > /tmp/ccvTv9iN.o: In function `boost::system::error_code::error_code()': > serial.cpp:(.text._ZN5boost6system10error_codeC1Ev[boost::system::error_code::error_code()]+0x10): undefined reference to `boost::system::get_system_category()' > /tmp/ccvTv9iN.o: In function `boost::asio::error::get_system_category()': > serial.cpp:(.text._ZN5boost4asio5error19get_system_categoryEv[boost::asio::error::get_system_category()]+0x7): undefined reference to `boost::system::get_system_category()' > collect2: ld returned 1 exit status > > > If you reply to this email, your message will be added to the discussion below: > http://boost.2283326.n4.nabble.com/Simple-serial-port-demonstration-with-bo… > To unsubscribe from Simple serial port demonstration with boost asio asynchronous I/O, click here. -- View this message in context: http://boost.2283326.n4.nabble.com/Simple-serial-port-demonstration-with-bo… Sent from the Boost - Users mailing list archive at Nabble.com.

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boost.log compilation
by asif saeed 27 Aug '11

27 Aug '11

Hi, I am having problems compiling boost.log. I am using Visual C++ 2010 Express. There is no project/solution file for VS2010. Perhaps I need to use bjam but executing "bjam Jamfile.v2" doesn't result in anything. Can you please give me a simple command for compiling boost.log for Visual C++ 2010 Express - 32-bit targeted at Windows Server 2003? I can read BJam docs but that'll take too much time - I need to compile boost.log urgently. Thanks in advance, Asif

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Using boost unit test with QtCreator
by Wilhelm 26 Aug '11

26 Aug '11

Hi all, if one uses the boost unit test macros (see below), qtcreator marks the BOOST_CHECK(...) macros as syntax error (expected ;): #include <boost/test/unit_test.hpp> #include "person.h" BOOST_AUTO_TEST_CASE(Person1) { Person p("Hugo", "Tester"); BOOST_CHECK(p.firstname() == "Hugo"); BOOST_CHECK(p.lastname() == "Tester"); } Does anybody know how to avoid this (yes, I can use the Qt unit testing framework, but thats not a solution in this special case)? -- Wilhelm

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[Containers] Marshalling deques
by Brian Wood 26 Aug '11

26 Aug '11

There's a thread here -- http://groups.google.com/group/comp.lang.c++/browse_thread/thread/0a6a19f83… that I'd like to mention. Does the deque in the Containers library have support for accessing the chunks it uses? Would you be willing to add a function that gives that? Tia. Shalom, Brian Wood Ebenezer Enterprises http://webEbenezer.net

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asio tcp::resolver, service resolution
by Lloyd 26 Aug '11

26 Aug '11

Hi, In documentation I saw that using tcp::resolver::query constructor it is possible to resolve domain.name as well as service name, as shown in the following code fragment. boost::asio::io_service ios; boost::asio::ip::tcp::resolver resolver(ios); boost::asio::ip::tcp::resolver::query query("mydomain.com","myservice"); Here 'myservice' is not a well known service (port number). For resolving 'myservice' where should I add the port number? in my domain name server's (BIND) /etc/services file or in my local systems services file? Or is it 'really' possible to resolve a service name? Thanks, Lloyd

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accumulator: serialization support
by Neal Becker 26 Aug '11

26 Aug '11

I have typedef accumulator_set<el_t,stats<tag::mean,tag::abs_sqr> > accum_t; How can I add serialization?

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[qi][lambda] Get wrong reaction of the qi::rule if I use lambda for the action
by boost_mailinglist＠gmx.de 26 Aug '11

26 Aug '11

Hello, if I execute the following example, I get the following output "The bad one The good one a" but I only expected "The good one a". Why does it happens? Boost 1.47.0 was used. #include <boost/config/warning_disable.hpp> #include <boost/spirit/include/qi.hpp> #include <boost/lambda/lambda.hpp> #include <iostream> int main() { using boost::spirit::qi::char_; using boost::spirit::qi::parse; char const *first = "{a}", *last = first + std::strlen(first); parse(first, last, '{' >> char_("a")[std::cout << "The good one " << boost::lambda::_1 << '\n'] | char_("b")[std::cout << "The bad one " << boost::lambda::_1 << '\n'] >> '}'); return 0; }

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[boost::polygon::transform.hpp] Concatenation of transformations fails.
by Dimitris Dakopoulos 26 Aug '11

26 Aug '11

Hello to all, I want to apply to geometrical transformations (in this case translations) on a point. Point3D trans1(1,0,0); Point3D trans2(2,0,0); Point2D p(100,100); gtl::transformation<int> T1( trans1 ); gtl::transformation<int> T2( trans2 ); gtl::transform( p, T1 ); gtl::transform( p, T2 ); --- ... and the point's coordinates are (97,100) as expected. --- When I try to concatenate the transformations: Point3D trans1(1,0,0); Point3D trans2(2,0,0); Point2D p(100,100); gtl::transformation<int> T1( trans1 ); gtl::transformation<int> T2( trans2 ); gtl::transform( p, T1 + T2 ); --- ... and I get random numbers. I checked the boost/polygon/detail/transform_detail.hpp template <typename coordinate_type> inline const transformation<coordinate_type>& transformation<coordinate_type>::operator+=(const transformation<coordinate_type>& tr){ //apply the inverse transformation of this to the translation point of that //and convolve it with this translation point coordinate_type x, y, z; transformation<coordinate_type> inv = inverse(); inv.transform(x, y, z); p_.set(HORIZONTAL, p_.get(HORIZONTAL) + x); p_.set(VERTICAL, p_.get(VERTICAL) + y); p_.set(PROXIMAL, p_.get(PROXIMAL) + z); //concatenate axis transforms atr_ += tr.atr_; return *this; } ... and I noticed that the coordinate_type x, y, z; is not initialized and then the transformation is applied: inv.transform(x,y,z); which of course results to something random. Any ideas? Thank you for checking. Dimitris

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[serialization] The famous non-const value trap
by cc caprani 26 Aug '11

26 Aug '11

Hi Boosters, I had the compile time warning discussed here ( http://boost.2283326.n4.nabble.com/Serialization-C4308-warning-with-MSVC9-t…) that Robert is probably fed up discussing. I've read for months, but didn't want to const_cast my object (or is it ok sometimes?). However, making my destructor virtual removed the warning. Here's my question: why does making the object destructor virtual remove the warning, effectively making my object instances const? And the section on this trap from the Rationale section of the Serialization documentation is not in the1.47 version (howcome?) but can be found in previous version here: http://www.boost.org/doc/libs/1_39_0/libs/serialization/doc/rationale.html#… Oh, and please forgive me if the answer is *obvious* - just an intermediate programmer. Colin

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Subject: Re: [Containers] Marshalling deques
by Brian Wood 26 Aug '11

26 Aug '11

Michael Goldshteyn: > I think that having a ?configurable? deque class template > is one of the best things that could be offered by a boost > Containers library. I have always wondered why noone > wrote a version of the deque class template that allowed > the configuration of such things as the page / block size, > rather than have it be determined by a compile time > formula based on the size of the data type being stored. > It would seem to me that the page / block size is one of > the more critical pieces affecting the size / speed > tradeoffs in a deque?s performance when there are many > insertions taking place. The thread I mentioned has a link to a segmented_array container which may be of interest. I agree that what you suggest would be an improvement. Shalom, Brian Wood Ebenezer Enterprises http://webEbenezer.net <http://webebenezer.net/>

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[filesystem] posix path on cygwin disappeared - how to make it work?
by Frédéric Bron 25 Aug '11

25 Aug '11

How can I use the posix path on cygwin? I am trying to upgrade from 1.43 but macros BOOST_POSIX_API and BOOST_POSIX_PATH are now deprecated. Why forcing WINDOWS_API while it worked well before? Regards, Frédéric

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boost::mutex::scoped_lock fails with res = 22 (EINVAL)
by Andrej van der Zee 25 Aug '11

25 Aug '11

Hi, I am trying to understand why the acquiring of a lock fails on error code 22 (EINVAL). After Googling I find one of two causes: 1) The mutex was created with the protocol attribute having the value PTHREAD_PRIO_PROTECT and the calling thread's priority is higher than the mutex's current priority ceiling. The mutex is created by the main-thread and the lock is acquired by a thread from a boost::thread_group. But in many cases the lock is acquired without error, so I guess this is not the cause. 2) The value specified by mutex does not refer to an initialized mutex object. The mutex is default constructed by boost::mutex's constructor so I expect it to be initialized properly. Both causes *seem* not to apply to my case. What am I missing here? I am using boost 1.46.1 on Ubuntu amd64. Cheers, Andrej

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Re: [Boost-users] [type traits] Extension to operator operatordetection -> choose your preferred naming
by Alex Perry 25 Aug '11

25 Aug '11

on Tue Aug 23 2011, Fr?d?ric Bron <frederic.bron-AT-m4x.org> wrote: > We have come to three proposed lists of names (A, B and C): > https://svn.boost.org/trac/boost/wiki/GuideLines/Naming/OperatorTraitN > ames I have included the corresponding names of standard keywords, > standard function objects from <functional>, boost Proto and boost > Operators. Another vote for C (though having done nothing on this not sure my vote really counts for anything) - only issue I have with C is :- has_negate surely has_unary_minus needs to be there as an alias for this at the very least. Alex

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[Boost.Test]feature request to list testcase tree
by Tan, Tom (Shanghai) 25 Aug '11

25 Aug '11

I am a fan of Boost.Test. As a habbit, I organize my code this way: // file: Foo.h Class foo { // implementations }; #ifdef ENABLE_TEST namespace test_cases { BOOST_AUTO_TEST_CASE(foo_tests) { // test predicates of class foo } } //namespace test_cases #endif //end of file Foo.h With this structure, I can always carry test cases with any class I write, I just need to copy the file around. When I need to test it there is a universal test main.cpp //File test_main.cpp #define BOOST_TEST_MAIN #include <boost/test/unit_test.hpp> #define ENABLE_TEST #include "foo.h" //#include other includes //End of File test_main This pattern has helped me to use TDD easily. The only issue is that test cases are scattered among each header files. Usually I do not know exactly how many test cases/suites are included. If there is a {--list|-l } option to print a tree of registered test suites and test cases, so that one can quickly look them up here and filter the test cases to be run, it would be a great feature.

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Boost.Serialization: Error on Calling Class Method during serialization process
by Hazrat Pradipta Ranjali 25 Aug '11

25 Aug '11

I have the following problem when I try to call method in "TestSerialize" class during serialization process. Here is my code: class TestSerialize { public: std::string GetVal() { return Val + "abc"; } void SetVal(std::string tVal) { Val = tVal.substr(0, 2); } protected: std::string Val; friend class boost::serialization::access; template<class Archive> void save(Archive & ar, const unsigned int version) const { using boost::serialization::make_nvp; std::string tVal = GetVal(); // Error here ar & make_nvp("SC", tVal); } template<class Archive> void load(Archive & ar, const unsigned int version) { using boost::serialization::make_nvp; std::string tVal; ar & make_nvp("SC", tVal); SetVal(tVal); } BOOST_SERIALIZATION_SPLIT_MEMBER(); }; int main() { TestSerialize tS; std::ofstream ofs("test.xml"); boost::archive::xml_oarchive oa(ofs, boost::archive::no_header); oa << BOOST_SERIALIZATION_NVP(tS); ofs.close(); return 0; } The error that I encountered is: 'TestSerialize::GetVal' : cannot convert 'this' pointer from 'const TestSerialize' to 'TestSerialize &' This error only happens on "save" but not "load" I wonder why I get this error. I would like to know what Boost.Serialization do such that we have these two different behaviors. I use Boost Library 1.47.0 Regards,

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