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

boost thread with class
by Philipp Kraus 30 Dec '12

30 Dec '12

Hello, I use a thread group for creating a blocking thread calculation. Each thread is created with a boost::bind to a member function, but I would like to create a own class for the thread eg class myThread { public some methods private some properties } The group should be boost::thread_group g; for(int i=0; i < 10; i++) g.add( myThread( i ) ) g.join_all(); Which structure must be implementated for the class myThread and from which class must be derived? Thanks Phil

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How to use boost serialization and standard arrays?
by D. R. Evans 30 Dec '12

30 Dec '12

I've spent quite a bit of time searching and reading, but I can't understand why the following is happening. Given a simple function: (non-boost headers) . . . #include <boost/archive/binary_oarchive.hpp> #include <boost/serialization/array.hpp> . . . void archive_data(void) { ofstream ofs(context.archive_name()); boost::archive::binary_oarchive ar(ofs); array<int, 10> test; ar << test; } I get: /usr/include/boost/serialization/access.hpp:118:9: error: ‘struct std::array<int, 10u>’ has no member named ‘serialize’ ---- The documentation says: > This group of headers includes templates which implement serialization for > Standard Library or Boost Library templates. Any program which uses these > templates can invoke serialization of objects of these types just by > including the corresponding header. But it seems that including <boost/serialization/array.hpp> is insufficient. What am I missing? (Of course, in practice I'm not doing this with simple ints, but I've simplified greatly to get to the above example, which still fails.) This is my first attempt at using boost serialization, so I expect I've just misunderstood something quite simple. Doc Evans -- Web: http://www.sff.net/people/N7DR

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socket.is_open returning false when it is in use
by Gonzalo Garramuno 30 Dec '12

30 Dec '12

I have a problem with my program and I traced it to socket.is_open which returns as closed even while the connection is active in my server program. The client, however, can still communicate with that supposedly closed socket. The program is similar to the timeouts example. I can post all the source code if needed.

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compile some code with boost.python by mingw in win7-64bit
by simon zhang 30 Dec '12

30 Dec '12

I decided to make my program compatible with windows environment.But I have very little programming experience on windows.There are some errors need help. Environment: - os: win7-64bit, - ide: codeblocks12.11, - python: Python 2.7.3 Windows X86-64 Installer (Windows AMD64 / Intel 64 / X86-64 binary [1] -- does not include source) - compiler: mingw that come from codeblocks installation package. - boost: boost1.52 I only copy and test this "hello" code that come from ".\boost_1_52_0\libs\python\example\tutorial" Code: #include <iostream>#include <boost/python/module.hpp>#include <boost/python/def.hpp> char const* greet(){ return "hello, world"; } BOOST_PYTHON_MODULE(hello_ext){ using namespace boost::python; def("greet", greet);} using namespace std;int main(){ cout << "Hello world!" << endl; return 0;} Error info: mingw32-g++.exe -Wall -fexceptions -g -ID:\boost\include\boost-1_52 -IC:\Python27\include -c E:\project\snail-MW\test1\main.cpp -o obj\Debug\main.o mingw32-g++.exe -LD:\boost\lib\ -LC:\Python27\libs -o bin\Debug\test1.exe obj\Debug\main.o -static obj\Debug\main.o: In function `inithello_ext': E:/project/snail-MW/test1/main.cpp:11: undefined reference to `boost::python::detail::init_module(char const*, void (*)())' obj\Debug\main.o: In function `ZNK5boost6python9type_info4nameEv': D:/boost/include/boost-1_52/boost/python/type_id.hpp:165: undefined reference to `boost::python::detail::gcc_demangle(char const*)' obj\Debug\main.o: In function `ZNK5boost6python15to_python_valueIRKPKcEclES5_': D:/boost/include/boost-1_52/boost/python/converter/builtin_converters.hpp:161: undefined reference to `boost::python::converter::do_return_to_python(char const*)' ................ It have also do some errors that only compile by the command of "bjam toolset=gcc variant=release " in the station ".\boost_1_52_0\libs\python\example\tutorial".

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thread-safe boost::random_device / boost:mt19937
by Philipp Kraus 27 Dec '12

27 Dec '12

Hello, I'm using boost::random_device & boost::mt19937 for creating random numbers. I would like to use both within different threads, are both object thread-safe, so I can use it without any thread locking? Thanks Phil

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filesystem : home directory
by berenger.morel＠neutralite.org 27 Dec '12

27 Dec '12

Hello. I am would like to use path like "~/.config" in the filesystem. I've searched in documentation and find nothing about it, so I ended by doing something I do not really like, but which sounds to work (I did not tried it on windows, but I my software is not a linux-only one and so I hope people will use it on other OSes. My problem is that I only have an XP partition and there are no development softwares on it. I could add some, but it would mean I need to reboot to test a software, and on an old windows... :/ ), at least on linux. Here are copy/past (with todos, just ignore them) of related portions of my code: =========================== = utils.cpp = =========================== #ifdef WIN32 #define HOME "HOMEPATH" ///\todo check that it should not be %APPDATA% instead of %HOMEPATH% #else #define HOME "HOME" #endif ... std::string getUserConfigDir(void) { ///\todo find a better solution to follow freeDesktop.org's recommmandations std::string homepath(getenv(HOME));///\note flawfinder say I should use getenv with care const fs::path usualUserConfig(homepath + "/.autorealm/config"); if(fs::exists(usualUserConfig)) return usualUserConfig.string(); const fs::path xdgUserConfig(homepath + "/.config/autorealm/config"); if(fs::exists(xdgUserConfig)) return xdgUserConfig.string(); return std::string(); } =========================== Here, the thing I do not like is to need to use the getenv() function, which is portable, but introduces an #ifdef condition. More important, if I had used things like "~/config/" the source code would have been easier to read and would have avoided one string allocation and some concatenations. But maybe they would have been into filesystem... Another problem which will come from the usage of my system is that it only supports WIN32 and linux, maybe Mac OS, maybe other POSIX systems. As you can see, I can only say "maybe" for other OSes, and for non POSIX OSes (is there is any which is not MSW?) I have just no clue. If that feature was supported by a library, at least it would avoid hard-coded OS's dependent stuff. So, is there is a better way to portably use the $HOME shortcut linux users are used ('~')? If it is any other symbol, I do not care at all, too, I just want an unified way to do that. PS: Of course, if you have other remarks about that code snippet or other things, I would be grateful to hear them.

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Fusion variadic vs. fusion numbered vector
by Андрей - 23 Dec '12

23 Dec '12

Hi Is there any converter ( such as boost::fusion::as_vector ) in fusion for convert numbered form type of boost::fusion::vector to variadic ? Another question is why boost::fusion::make_vector ad boost::fusion::as_vector returns numbered forms of vector but boost::fusion::vector_tie - variadic ?

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Replacing task_io_service (using io_service with an external threadpool)
by Juan Ramírez 23 Dec '12

23 Dec '12

Hi! I created a (yet another) threapool library a few month ago and, at my company, we are starting to use it widely in different services. Using the library has lots of advantages for us, mainly because of it performance compared with similar libraries. The problem we are having is that we are using 'two' different kinds of thread pool in the same service: * The first one is the one I wrote above, the pool provided by my library, which is used to execute by the service to execute long or expensive operations. * And the second one, is the one created a the network level, where about a hundred threads are created in order to attend network requests. ** Actually calling new thread(io_service::run, ...) I wanted to move the thread-handling at the network level to my library, so I started to look at documentation about extending boost::asio and adapting my library to the io_service requirements. What I want to do now is to make the io_service object actually use the threadpool library for task execution. I have taken a look to use_service, add_service, and the io_service::service class, and I think I already have a pretty good implementation of a 'poor man's adaptor' between my library and boost asio. The question is, how do I force the io_service object to use my service implementation instead of the on provided by boost::asio::detail::task_io_service? I mean, I haven't tested yet but I have no idea about how does the io_service know which service should be used in each case. Do I have to force the removal of task_io_service? Do I have to call pool() somewhere or re-implement run() functions? Thanks in advance Best Regards __________ Saludos! Juan

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[spirit][qi] on_error handler
by Diederick C. Niehorster 22 Dec '12

22 Dec '12

Hi All, I have struggled through getting a parser set up with qi, but in the end it all worked out. Its really a nice library once you get the hang of it a bit! I have one leftover question. I now have an inline function with phoenix for the error handler as per the example, but as i'm using it multiple times, i would like to make its own function that i can reuse. I have tried a function object, wrapped in a phoenix function or not, but never got it to work (either got number of argument mismatches or errors that const-volatile qualifiers were being dropped). So basically, how would i rewrite the below into a free function (object/etc)? qi::on_error<qi::fail> ( stimSpecVec // rule name , std::cout // the function << phoenix::val("Error! Expecting \"") << qi::_4 // what failed? << phoenix::val("\", but got: \"") << phoenix::construct<std::string>(qi::_3, qi::_2) // iterators to error-pos, end << phoenix::val("\"") << std::endl ); Thanks! Dee

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Boost.MSM: Exit a composite state after an event has been fired from that composite state?
by RaRi 21 Dec '12

21 Dec '12

Hi list, I'm using boost.msm from the boost 1.52 library and trying to fire an event from a composite state to enter a state of a top level state machine. Unfortunatly this doesn't work. Please consider here for the following code: namespace { namespace msm = boost::msm; namespace msmf = boost::msm::front; namespace mpl = boost::mpl; // ----- Events struct Event1 {}; struct Event2 {}; struct EventSub1 {}; struct EventSub2 {}; // ----- State machine struct OuterSm_:msmf::state_machine_def<OuterSm_> { struct State1_:msmf::state_machine_def<State1_> { template <class Event,class Fsm> void on_entry(Event const&, Fsm&) const { std::cout << "State1::on_entry()" << std::endl; } template <class Event,class Fsm> void on_exit(Event const&, Fsm&) const { std::cout << "State1::on_exit()" << std::endl; } struct SubState1:msmf::state<> { template <class Event,class Fsm> void on_entry(Event const&, Fsm& fsm) const { std::cout << "SubState1::on_entry()" << std::endl; std::cout << "SubState1::fire event2()" << std::endl; fsm.process_event(Event2()); // Produces an assertion -> It is not possible to leave the submachine although the "Event2()" is defined as transition in the transition table of the outermachine. } template <class Event,class Fsm> void on_exit(Event const&, Fsm&) const { std::cout << "SubState1::on_exit()" << std::endl; } }; struct SubState2:msmf::state<> { template <class Event,class Fsm> void on_entry(Event const&, Fsm& a) const { std::cout << "SubState2::on_entry()" << std::endl; } template <class Event,class Fsm> void on_exit(Event const&, Fsm&) const { std::cout << "SubState2::on_exit()" << std::endl; } }; struct Exit1:msmf::exit_pseudo_state<msmf::none> {}; // Set initial state typedef mpl::vector<SubState1> initial_state; // Transition table struct transition_table:mpl::vector< // Start Event Next Action Guard msmf::Row < SubState1, EventSub1, SubState2, msmf::none, msmf::none > // Is there a possibility in MSM to exit a composite state if an event is fired from that // msmf::Row < SubState1, Event2, Exit1, msmf::none, msmf::none > I don't want this! > {}; }; struct State2:msmf::state<> { template <class Event,class Fsm> void on_entry(Event const&, Fsm&) const { std::cout << "State2::on_entry()" << std::endl; } template <class Event,class Fsm> void on_exit(Event const&, Fsm&) const { std::cout << "State2::on_exit()" << std::endl; } template <class Event, class Fsm, class SourceState, class TargetState> void operator()(Event const&, Fsm& f, SourceState&, TargetState&) const { std::cout << "Do function" << std::endl; } }; typedef msm::back::state_machine<State1_> State1; // Set initial state typedef State1 initial_state; // Transition table struct transition_table:mpl::vector< // Start Event Next Action Guard msmf::Row < State1, Event2, State2, State2, msmf::none > > {}; }; // Pick a back-end typedef msm::back::state_machine<OuterSm_> Osm; void test() { Osm osm; osm.start(); // osm.process_event(Event2()); // This works fine -> Leaving state "Substate1" of the submachine } } int main() { test(); return 0; } You see that the code calls f*sm.process_event(Event2())* within the state *SubState1* of the submachine to make a transition from the top-level state *State1* to *State2* of the outer statemachine. Unfortunately this doesn't work although the *Event2* is defined in the transition table of the outer-statemachine. On the other hand it a transition from *State1* to state *State2* works in case the event *Event2* is fired outside the submachine ( please refer to the void test() function in the code above). I actually don't want to define a transition in the transition table of submachine to enter an pseudo exit point like: msmf::Row < SubState1, Event2, Exit1, msmf::none, msmf::none > Is there a possibility in MSM to exit a composite state if an event is fired from that composite state? Thank you in advance for your time and help! Grüße ;), RaRi -- View this message in context: http://boost.2283326.n4.nabble.com/Boost-MSM-Exit-a-composite-state-after-a… Sent from the Boost - Users mailing list archive at Nabble.com.

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Install Boost 1.52.0 for Visual Studio 2012 on Windows 8
by Boost lzw 21 Dec '12

21 Dec '12

Hello All, I used the following Windows installer to install Boost in the past for Visual Studio 2008 Professional on Windows XP in the past: http://www.boostpro.com/download/ It seems to me that the above installer is not for Visual Studio 2012 on Windows 8. Is there anyone here who is aware of a Windows Installer for installing Boost 1.52.0 for Visual Studio 2012 on Windows 8 ? Thanks in advance. Happy Holidays, Robert

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Is 'double' a signed type? (boost type traits)
by cdmh 21 Dec '12

21 Dec '12

Hi, I have found some surprising behaviour with boost type traits using MSVC2012 (v11). I used boost::is_signed<T>::value where T is double and it evaluates to false, but I expected true as double can hold negative numbers. More surprisingly, I found that, for double, is_unsigned is not the inverse of is_signed, and hence this static assert produces a compiler error. BOOST_STATIC_ASSERT(boost::is_unsigned<double>::value == !boost::is_signed<double>::value); I am missing a rationale for this, or it is a bug? Thanks -- Craig -- View this message in context: http://boost.2283326.n4.nabble.com/Is-double-a-signed-type-boost-type-trait… Sent from the Boost - Users mailing list archive at Nabble.com.

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boost::bind for C function
by Philipp Kraus 21 Dec '12

21 Dec '12

Hello, I have got a a C library function call, which defines a function: typedef int (*CFunction) (State* K); So I would like to use boost::bind / boost::function to create the binding to a class method: boost::function<CFunction>( boost::bind(&MyClass::myMethod, this) ) so that I can use the class method with the CFunction signature. I would like to call a class method with the object context like a C function. Can anybody help me to create a correct binding? Thanks Phil

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[Property Message] How to store variant in property tree
by Elizabeta 21 Dec '12

21 Dec '12

Hi I want to store variant object in my property tree. The variant for now will have only 3dPoint object, but it should vary multiple types in future. I tried the following code , and I am getting compiler errors. I know that maybe I need to write some kind of translation code for this to work,but don't know how to do that exactly and having hard time to grasp the concept. So how can I do this if possibly at all ? A code example would be great class 3dPoint { public: 3dPoint(double,double,double); double x; double y; double z; }; typedef boost::variant<ON_3dPoint> MyVariant; using namespace boost::property_tree; typedef basic_ptree<std::string,MyVariant> my_ptree; my_ptree pt; MyVariant point_variant = 3dPoint(1,2,3); pt.put("point",point_variant); MyVariant point_variant2 = pt.get("point"); boost::property_tree::xml_writer_settings<char> settings('\t', 1); write_xml("C:\\property.xml",pt,std::locale(),settings);

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Symbol 'is_arithmetic' could not be resolved, Symbol 'is_const' could not be resolved, Symbol 'value' could not be resolved
by Tanya 21 Dec '12

21 Dec '12

Dear Boost Users, I have a code with: BOOST_STATIC_ASSERT(::boost::is_arithmetic<T>::value); and it gives error message: - Symbol 'is_arithmetic' could not be resolved - Symbol 'value' could not be resolved and, BOOST_STATIC_ASSERT(!::boost::is_const<T>::value); and it gives error message: - Symbol 'value' could not be resolved - Symbol 'is_const' could not be resolved what should I include to get rid of these error message? I use: - Boost 1.46.1. - Compiler : Mingw with gcc - IDE: Eclipse Indigo Indigo Service Release 2 - Windows XP Professional SP 3, v. 2002 Any help, hints, would be highly appreciated! Best Regards, Tanya

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BOOST::ASIO load key.pem with passphrase
by Alvaro Leiva 21 Dec '12

21 Dec '12

Currently I'm working with this: ... ctx.use_certificate_chain_file("./C/cert.pem"); ctx.use_private_key_file("./C/key.pem", boost::asio::ssl::context::pem); ctx.load_verify_file("./C/ca.pem");... So far everything works perfect, but what I really need to do is load the same key.pem but with a passphrase, Looking at asio docs found ssl::context::set_password_callback<http://www.boost.org/doc/libs/1_52_0/doc/html/boost_asio/reference/ssl__con…> wich according to the info calls SSL_CTX_set_default_passwd_cb<http://www.openssl.org/docs/ssl/SSL_CTX_set_default_passwd_cb.html> and allows to handle encrypted PEM files, please remember that I'm much more familiarized with high level languages like python, so c++ is not my forte any help is appreciated, Thank you ! -- Alvaro Leiva

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Link problem on Mac - tag_original_exception_type
by John M. Dlugosz 20 Dec '12

20 Dec '12

I'm getting a linker error when I build my program on the Mac, that __ZTSPN5boost27tag_original_exception_typeE is duplicate defined. This is the only symbol that is giving this problem. Any ideas what's special about that one, or what it might be?

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[preprocessor]:issues with expansion.
by Littlefield, Tyler 20 Dec '12

20 Dec '12

hello all: I have the following code: #define REGISTER_MODULE(module)(\ #ifdef BOOST_PP_EQUAL(BOOST_PP_LIST_SIZE(MODULES), 0)\ //there are currently no modules in the list. #define MODULES((module), BOOST_PP_NIL) #else BOOST_PP_LIST_APPEND(MODULES, module)\ #endif ) I am somewhat of a newb at preprocessor magic, so any advice would be useful. For whatever reason this translates out to 'module)' when I try to compile it with -E -P. The idea is that it will add to the modules list (assuming the modules list exists) the module to be registered, which should just be a type. Thanks, -- Take care, Ty http://tds-solutions.net The aspen project: a barebones light-weight mud engine: http://code.google.com/p/aspenmud He that will not reason is a bigot; he that cannot reason is a fool; he that dares not reason is a slave.

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C++ gurus - really dumb question regarding partial speciallization.
by Robert Ramey 20 Dec '12

20 Dec '12

I've got the following code which fails to compile. I'm really stumped by this. I've consulted the standard document on the subject and for the life of me I can't see anything wrong with it. It fails with the same message on vc 9.0 as well as gcc 4.5.3. It's so simple it can't be a compiler issue. I appoligize in advance for spaming the list here - but I'm really, really stuck. Robert Ramey // primary template template< class T, int MIN, int MAX > struct safe_range1{}; // instantiate primary as a test safe_range1<int, 0, 1> t1; // partial specialization # 1 template< int MIN, int MAX > struct safe_range1<int, MIN, MAX>{}; // instantiate partial specialization - what the ??? // fails with "too few template parameters" !!! safe_range1<0, 1> t2; // partial specialization # 2 template<class T> struct safe_range1<T, 0, 1> {}; // also fails with "too few template parameters" !!! safe_range1<int> t3;

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[polygon] bug with self intersecting polygons ?
by Renaud Lepère 20 Dec '12

20 Dec '12

Hello, I'm trying to remove some internal loops on polygons as illustrated in the following drawing : +---------------+ +---------------+ | | / | / | |\ / | / | | X | X | |/ \ | \ | / \ | \ +----->---------+ +----->---------+ I need strong numerical robustness, i am using boost polyon with integer coordinates (using boost-1.52 + win32). It works on a lot of samples but i encounter a bug on an example. I reduced to the following sample which is roughtly a triangle (IMHO it should return a triangle). #include <boost/polygon/polygon.hpp> #include <vector> #include <iostream> using namespace boost::polygon; using namespace std; typedef point_data< int > point; typedef vector< point > points; typedef polygon_set_data< int > polygon_set; typedef polygon_with_holes_data< int > polygon_with_holes; typedef vector< polygon_with_holes > polygons_with_holes; /* * A triangle A, B, C with some nearly aligned points between B and C. * * A * + * |\ * | \ * | \ * | \ * | \ * | \ * | \ * | \ * | /-+ C * B +--- */ polygon_with_holes MakeRawPolygon() { points ps; ps.push_back(point(-181928106,288346744)); // A ps.push_back(point(-15311797,-289428209)); // B ps.push_back(point(56093690,-270295166)); ps.push_back(point(24502047,-278760121)); ps.push_back(point(57745146,-269852659)); ps.push_back(point(56791908,-270108078)); ps.push_back(point(-14613579,-289241121)); ps.push_back(point(82923673,-263106094)); // C polygon_with_holes poly; set_points(poly, ps.begin(), ps.end()); return poly; } int main() { polygon_with_holes polygon(MakeRawPolygon()); polygon_set ps; ps.insert(polygon); // first unrool polygons_with_holes unrolled_polygons; ps.get(unrolled_polygons); if (unrolled_polygons.size() == 0u) { std::cout << "error" << endl; } } Is there something wrong in my code ? or is this a real bug. Thanks for your help and time. Renaud

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[Boost.Test] Command line arguments
by Noah Roberts 20 Dec '12

20 Dec '12

I want to add command line arguments to my unit test but I cannot find how to do so. I found the place to get argc and argv from the main suite, but when I pass in arguments that the framework doesn't already know about I get heap corruption. Is there a way to instruct the unit test framework about additional command line arguments you want to process in your test?

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Boost.MSM -> Ignore events that were not explicitly defined for a state
by RaRi 19 Dec '12

19 Dec '12

Hello list, I'm experimenting a bit with *boost.msm* from the *boost 1.52* library. Please consider the following small code snippted which generally defines a state machine with the states *State1*, *State2* and *State3*, and the events *Event1* (triggers the transition from State1 to State2) and *Event2* (triggers the transition from State2 to State3): #include <iostream> #include <boost/msm/back/state_machine.hpp> #include <boost/msm/front/state_machine_def.hpp> #include <boost/msm/front/functor_row.hpp> namespace { namespace msm = boost::msm; namespace msmf = boost::msm::front; namespace mpl = boost::mpl; // ----- Events struct Event1 {}; struct Event2 {}; // ----- State machine struct Sm1_:msmf::state_machine_def<Sm1_> { // States struct Init:msmf::state<> {}; struct State1:msmf::state<> { // Entry action template <class Event,class Fsm> void on_entry(Event const&, Fsm&) { std::cout << "State1::on_entry()" << std::endl; } // Exit action template <class Event,class Fsm> void on_exit(Event const&, Fsm&) { std::cout << "State1::on_exit()" << std::endl; } }; struct State2:msmf::state<> { // Entry action template <class Event,class Fsm> void on_entry(Event const&, Fsm&) { std::cout << "State2::on_entry()" << std::endl; } // Exit action template <class Event,class Fsm> void on_exit(Event const&, Fsm&) { std::cout << "State2::on_exit()" << std::endl; } }; struct State3:msmf::state<> { // Entry action template <class Event,class Fsm> void on_entry(Event const&, Fsm&) { std::cout << "State3::on_entry()" << std::endl; } // Exit action template <class Event,class Fsm> void on_exit(Event const&, Fsm&) { std::cout << "State3::on_exit()" << std::endl; } }; // Set initial state typedef State1 initial_state; // Actions struct InitAction { template <class Event, class Fsm, class SourceState, class TargetState> void operator()(Event const&, Fsm&, SourceState&, TargetState&) const { std::cout << "InitAction()" << std::endl; } }; struct transition_table:mpl::vector< // Start Event Next Action Guard msmf::Row < State1, Event1, State2, msmf::none, msmf::none >, msmf::Row < State2, Event2, State3, msmf::none, msmf::none > > {}; }; // Pick a back-end typedef msm::back::state_machine<Sm1_> Sm1; void test() { Sm1 sm1; sm1.start(); std::cout << "> Send Event2" << std::endl; sm1.process_event(Event2()); std::cout << "> Send Event1" << std::endl; sm1.process_event(Event1()); } } int main() { test(); return 0; } If I compile and execute the code above the software crashes due to the fact, that *Event2* is received in the state *State1*. My understanding of a state machine and boost.msm was, that all events which are not defined for a particular state, will be just ignored and the state receiving this unknown event (here *Event2*) will keept. Is there a possibility in boost.msm ( maybe by adopting to the transition table) to stay in the current state if an event was received which was not assigned to this state? Thank you in advance! Best regards, RaRi -- View this message in context: http://boost.2283326.n4.nabble.com/Boost-MSM-Ignore-events-that-were-not-ex… Sent from the Boost - Users mailing list archive at Nabble.com.

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[MPL] HAS_XXX gives the wrong answer after "enable_if" on incomplete type in GCC 4.6/7
by Duncan Exon Smith 19 Dec '12

19 Dec '12

I've run into an unexpected behaviour, and I'm not sure if the compiler has a bug, if Boost.MPL has a bug, or if I have the wrong expectations. I am using Boost v1.49.0, but I also tested r82084 of the Boost trunk. In particular, I have: BOOST_MPL_HAS_XXX_TRAIT_DEF(trait) // skipping important code here struct traitor_1 { typedef void *trait; }; struct traitor_2 { typedef void *trait; }; static_assert(has_trait<traitor_1>::value, "traitor_1::trait is missing"); static_assert(has_trait<traitor_2>::value, "traitor_2::trait is missing"); and the compiler tells me that "has_trait<traitor_1>::value" is "false", while "has_trait<traitor_2>::value" is "true". The above listing skips some key code involving boost::enable_if that appears to break "has_trait". The full listing is below. I would appreciate if any experts could tell me if this behaviour is expected. The complete code listing is below. I've tried: g++-4.6 -std=gnu++0x -I/usr/include/boost-1_49 -c -o/dev/null traitor.cpp g++-4.7 -std=gnu++0x -I/usr/include/boost-1_49 -c -o/dev/null traitor.cpp Thanks very much, Duncan // traitor.cpp # include <boost/utility/enable_if.hpp> # include <boost/mpl/has_xxx.hpp> BOOST_MPL_HAS_XXX_TRAIT_DEF(trait) class C { struct enabler { }; public: template <class T> C(const T &, typename boost::enable_if<has_trait<T>, enabler>::type = enabler()); }; struct traitor_1; void g(const C &); void g(const traitor_1 &); void f(const traitor_1 &t1) { g(t1); } struct traitor_1 { typedef void *trait; }; struct traitor_2 { typedef void *trait; }; static_assert(has_trait<traitor_1>::value, "traitor_1::trait is missing"); static_assert(has_trait<traitor_2>::value, "traitor_2::trait is missing");

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[Getting Started] Library Naming section is out of date
by Colin Powers 19 Dec '12

19 Dec '12

Hi all, apologies for any bad form in this email as it's my first posting, The getting started guide (current link: http://www.boost.org/doc/libs/1_52_0/more/getting_started/unix-variants.htm… ) states "Libraries built without multithreading support can be identified by the absence of -mt". However having done a bit of googling around I think this is no longer true, at least not necessarily. It seems the naming convention changed around Boost 1.40 and this documentation has never been updated. Here are some Stack Overflow links that suggest as much: http://stackoverflow.com/questions/1768943/building-boost-on-linux-library-… http://stackoverflow.com/questions/8940249/boost-how-bjam-constructs-a-libr… http://stackoverflow.com/questions/2293962/boost-libraries-in-multithreadin… I have also done a bit of a play around building Boost 1.49 and confirmed this seems to be the case. Should the wording in the getting started guide be redone to make this clear? It worried me for a moment when I thought I had not been using multithreaded libraries because there was no -mt in the filenames. Cheers -Colin

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[xpressive] compiler errors in c++11 mode with trunk
by Nathan Ridge 19 Dec '12

19 Dec '12

Hello, The following code: #include <string> #include <boost/xpressive/xpressive_static.hpp> void foo(const boost::xpressive::sregex& regex) { std::string input; boost::xpressive::regex_replace(input, regex, ""); } when compiled with GCC (I tested with 4.6/4.7/4.8) in C++11 mode, gives the following compiler error: In file included from boost/boost/xpressive/detail/core/regex_impl.hpp:21:0, from boost/boost/xpressive/match_results.hpp:54, from boost/boost/xpressive/detail/core/access.hpp:21, from boost/boost/xpressive/detail/core/state.hpp:18, from boost/boost/xpressive/detail/core/matcher/alternate_end_matcher.hpp:20, from boost/boost/xpressive/detail/core/matchers.hpp:17, from boost/boost/xpressive/regex_primitives.hpp:22, from boost/boost/xpressive/xpressive_static.hpp:24, from test.cpp:2: boost/boost/xpressive/detail/utility/tracking_ptr.hpp: In instantiation of 'struct boost::xpressive::detail::tracking_ptr<boost::xpressive::detail::regex_impl<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> > > >': boost/boost/proto/detail/preprocessed/expr_variadic.hpp:50:49: required from 'struct boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::xpressive::detail::tracking_ptr<boost::xpressive::detail::regex_impl<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> > > > >, 0l>' boost/boost/xpressive/basic_regex.hpp:53:8: required from 'struct boost::xpressive::basic_regex<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> > >' boost/boost/xpressive/regex_algorithms.hpp:916:5: required from 'BidiContainer boost::xpressive::regex_replace(BidiContainer&, const boost::xpressive::basic_regex<BidiIter>&, const typename boost::iterator_value<BidiIter>::type*, boost::xpressive::regex_constants::match_flag_type, typename boost::disable_if<boost::xpressive::detail::is_char_ptr<BidiRange> >::type*) [with BidiContainer = std::basic_string<char>; BidiIter = __gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >; typename boost::iterator_value<BidiIter>::type = char; typename boost::disable_if<boost::xpressive::detail::is_char_ptr<BidiRange> >::type = void]' test.cpp:7:53: required from here boost/boost/xpressive/detail/utility/tracking_ptr.hpp:440:73: error: no type named 'unspecified_bool_type' in 'class boost::intrusive_ptr<boost::xpressive::detail::regex_impl<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> > > >' It works fine if I don't compile in C++11 mode. It used to work fine even in C++11 mode in the 1.51 release (don't have 1.52 around to test ATM). Any suggestions for a fix/workaround? Thanks, Nate

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