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[boost-users][python] Problem with lifetime of object?
by Germán Diago 27 Aug '09

27 Aug '09

Hello. I would like to know what's wrong with this: Object * create() { return new Object(); } void addToScene(const std::string & name, Object * o) { //Store object in a std::multimap<std::string, Object *> } BOOST_PYTHON_MODULE(mod) { def("createObject", &create, return_value_policy<reference_existing_object>()); .... } I start my application, it works ok and it uses addToScene and create: Now I try to add a new object to my application from python: >> obj = Object() >> addToScene("obj", obj) Should the problem have anything to do with object lifetime? Or the segmentation fault is because of another issue? Thanks in advance.

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[asio] io_service::run() never returns and is blocking my thread
by Robert Dailey 27 Aug '09

27 Aug '09

Hello, I'm currently using a serial_port object to call async_read_some(). This results in io_service::run() blocking until at least 1 byte or more can be read from the serial port. If nothing is ever sent, then I can not safely exit the thread in which io_service::run() is executing in. In other words, a call to join() on that thread hangs indefinitely until data is received. My completion callback is not executed at all until data arrives for reading. How can I force run() to return when I interrupt my thread? --------- Robert Dailey

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Problem when using Boost.Asio at Fedora 11
by Davi Vercillo C. Garcia 27 Aug '09

27 Aug '09

Hi all, I'm new at C++ and Boost and I'm with some problems when I try to use Boost.Asio library. I was trying to build the first example from Boost.Asio's tutorial. The code is like this: ===== CODE ===== #include <iostream> #include <boost/asio.hpp> #include <boost/date_time/posix_time/posix_time.hpp> int main( int argc, char **argv ) { boost::asio::io_service io; boost::asio::deadline_timer t(io, boost::posix_time::seconds(5)); t.wait(); std::cout << "Opa !" << std::endl; return 0; } ===== CODE ===== I'm trying to compile using this command: g++ -I/usr/include/boost/ example.cpp -o example", and I'm getting this error: ==== ERROR ==== /tmp/ccv68fST.o: In function `__static_initialization_and_destruction_0(int, int)': timer.cpp:(.text+0x51): undefined reference to `boost::system::get_system_category()' timer.cpp:(.text+0x5b): undefined reference to `boost::system::get_generic_category()' timer.cpp:(.text+0x65): undefined reference to `boost::system::get_generic_category()' timer.cpp:(.text+0x6f): undefined reference to `boost::system::get_generic_category()' timer.cpp:(.text+0x79): undefined reference to `boost::system::get_system_category()' /tmp/ccv68fST.o: In function `boost::asio::error::get_system_category()': timer.cpp:(.text._ZN5boost4asio5error19get_system_categoryEv[boost::asio::error::get_system_category()]+0x7): undefined reference to `boost::system::get_system_category()' /tmp/ccv68fST.o: In function `boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> > >::context>::~posix_tss_ptr()': timer.cpp:(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceINS1_13epoll_reactorILb0EEEEEE7contextEED2Ev[boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> > >::context>::~posix_tss_ptr()]+0xf): undefined reference to `pthread_key_delete' /tmp/ccv68fST.o: In function `boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> > >::context>::posix_tss_ptr()': timer.cpp:(.text._ZN5boost4asio6detail13posix_tss_ptrINS1_10call_stackINS1_15task_io_serviceINS1_13epoll_reactorILb0EEEEEE7contextEEC2Ev[boost::asio::detail::posix_tss_ptr<boost::asio::detail::call_stack<boost::asio::detail::task_io_service<boost::asio::detail::epoll_reactor<false> > >::context>::posix_tss_ptr()]+0x22): undefined reference to `pthread_key_create' collect2: ld returned 1 exit status ==== ERROR ==== I already installed Boost and Boost-devel packages. Does anyone know what is missing ? Thanks, -- Davi Vercillo C. Garcia B.Sc. Student - DCC-IM/UFRJ Fedora Project Contributor http://davivercillo.fedorapeople.org/ "If a million people say a foolish thing, it is still a foolish thing." - Anatole France

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lock-free shared_ptr on solaris
by Frank Meerkötter 27 Aug '09

27 Aug '09

Hello, from looking at [1] i understood that there is no lock-free implementation of shared_ptrs on solaris. When snooping around in the source i noticed that there is a ./smart_ptr/detail/atomic_count_solaris.hpp It is using the solaris specific <atomic.h> to implement an atomic counter. frank@dexter:~/boost_1_40_0/boost$ find -type f | xargs grep atomic_count_solaris.hpp ./smart_ptr/detail/atomic_count_solaris.hpp:// boost/detail/atomic_count_solaris.hpp But apparently it is not in use. I am currently wondering why? KR, Frank [1] http://www.boost.org/doc/libs/1_40_0/libs/smart_ptr/shared_ptr.htm

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Implementing a type-and-effect system
by david raila 27 Aug '09

27 Aug '09

I'm pondering the use of boost to implement a type-and-effect static checker which consists of: 1. a system to define and name annotations 2. a way to declare and associate class members with the annotations 3. a way to declare effects on methods that say how the method interacts with the annotation 4. a way to capture uses of the members in the methods and verify that the effects are satisfied A simple example might be logical heap partitioning and interference checking which in the *abstract* might look something like this: class foo { heapregion a; heapregion b; foo * left in a; foo *right in b; foo *link(); void update() reads a, writes b { right = a->link(); // ok left = /*anything*/ // fails, writing a } This is one very simple example, but hopefully illustrates the idea. Ideally this can be all done statically at compile time without any run-time overhead, even if that means a two-phase compilation process, a checking phase that instantiates the checking code, and an optimized compile phase that might not. If this can be done via metaprogramming then we can avoid writing a new refactoring tool and/or modifying an existing front end. I've been trying to determine whether to try and implement a custom system or use proto or is there something else that might help in this effort? Is anyone aware of similar uses of boost, other libraries, or have advice and/or feedback. Thanks. David

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Boost release 1.40.0 is available
by Beman Dawes 27 Aug '09

27 Aug '09

Boost release 1.40.0 is available from SourceForge: http://sourceforge.net/projects/boost/files/ As always, the .7z and .zip files have Windows line endings, while the .bz2 and .gz files have POSIX line endings. Please download a file that has line endings appropriate for your platform. There are no new libraries in this release, but lots of libraries have been updated and had bugs fixed, including: * Accumulators * Asio * Circular Buffer * Filesystem * Foreach * Function * Fusion * Hash * Interprocess * Intrusive * MPL * Program Options * Proto * Python * Serialization * Unordered * Xpressive Enjoy! -- The Boost Release Managers

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[serialization]
by Marco Canini 27 Aug '09

27 Aug '09

Hi all, I'm getting exhausted with trying to get a functioning test case. I'm attaching my code, which consits of two classses: the second class Route is having a const reference member to the first class Protocol. It seems that I am able to serialize the two classes correctly, however when I deserialize the reference member is set to NULL. What am I doing wrong? Further, I was trying to have save_construct_data(...const Route * t...) to access the private members of the class Route by making it friend of the class. However, doing so results in a compiler error. Any idea of how I am supposed to deal with that? Thank you very much! -- Marco Canini

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Iterating over the seconds of a list of pairs
by Zachary Turner 27 Aug '09

27 Aug '09

I have an std::list<std::pair<double, float> > internal to a class. I'd like to expose begin() and end() functions from this class, that iterate over the second element of the list. So basically I want the user of the class to only see a sequence of floats. transform_iterator seems to fit the bill, but I think I'm seriously overcomplicating this. I've tried the following and it's not working. I feel like this pair_second / pair_first, and iterator should either already all be defined somewhere that I'm just not aware of, or be much shorter to write than this. template<class First, class Second> struct pair_second : public std::unary_function<std::pair<First, Second>, const Second&> { const Second& operator()(std::pair<First,Second>& pair) const { return pair.second; } }; template<class First, class Second> struct pair_first : public std::unary_function<std::pair<First, Second>, const First&> { const First& operator()(std::pair<First,Second>& pair) const { return pair.first; } }; template<class pair_type> struct first_iterator { typedef boost::transform_iterator< pair_first<typename pair_type::first_type, typename pair_type::second_type>, typename pair_type > type; }; template<class pair_type> struct second_iterator { typedef boost::transform_iterator< pair_second<typename pair_type::first_type, typename pair_type::second_type>, typename pair_type > type; }; typedef typename first_iterator<double_float_pair>::type float_iterator; float_iterator begin() { return float_iterator(items_.begin(), second_iterator<double_float_pair>()); } float_iterator end() { return float_iterator(items_.end(), second_iterator<double_float_pair>()); } Any advice would be appreciated. Thanks Zach

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[date_time] cannot understand idea behind c_time::gmtime function
by Roman Shmelev 27 Aug '09

27 Aug '09

Hi! I've seen different behaviour under Windows and FreeBSD of the function boost::date_time::c_time::gmtime Looking inside it confused me: (Windows variant) inline static std::tm* gmtime(const std::time_t* t, std::tm* result) { // RESULT VALUE IS NOT USED. SO WHAT SENSE TO PASS ANYTHING HERE? result = std::gmtime(t); if (!result) boost::throw_exception(std::runtime_error("could not convert calendar time to UTC time")); return result; } Under FreeBSD everything is ok (gmtime_r is used). So, probably it is a bug? I mean, the idea of cross-platform library - is that functions will operate in similar way on different platforms. Also, please look at documentation http://www.boost.org/doc/libs/1_39_0/doc/html/boost/date_time/c_time.html it says c_time has 4 functions (as I understand, 2 functions were cloned :/ ) so it also seems to be a bug.

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why send_to does not send all the packets..?
by Paolo Viotti 27 Aug '09

27 Aug '09

Hi, I'm using the boost asio library to create and manage a UDP socket. In my code I've a for loop in which I send some packets, as follows: for (it=refreshList.begin(); it !=refreshList.end(); it++){ [...] std::cout<<"___Refreshing: sent a KADEMLIA2_HELLO_REQ packet to "<< (*it)->getAddressString()<<":"<<(*it)->getUDPPort()<<std::endl; Packet* packet = new Packet(CList->getMyNodeID(),true); // KADEMLIA2_HELLO_REQ socket->send_to(boost::asio::buffer(packet->getPacket(), packet->getSize()), (*re)); } and actually it sends the packets, but just some of them: it stops sending after having sent about 30 packets out of 150, without throwing any exception or giving any error, while the loop continue and all the strings are regularly printed on std::cout. i'm really puzzled... is there any buffer to flush or any shutdown timer to take into account..? could it be due to another thread that is blocked on the receive_from function..? thanks, p_viotti

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[interprocess] shared_memory_object design
by Christian Henning 27 Aug '09

27 Aug '09

Hi there, a colleague of mine is questioning the design decisions in the shared_memory_object class. The assignment operator and copy constructor are private. Why? Also the constructor takes a type instead of a value as the first parameter. In his eyes it makes it very inflexible since the creation of or attaching to shared_memory area has to known at compile time. A few pointers on why such a design was chosen would be very helpful. Regards, Christian

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[assign] Inconvenience with list_of
by dariomt＠gmail.com 27 Aug '09

27 Aug '09

Hi list, I found a small inconvenience while trying to use boost::assign::list_of with the following code #include <vector> #include <boost/assign/list_of.hpp> struct A { // no implicit conversion from int explicit A(int i) {} // constructor from two ints A(int i, int j) {} }; void works_with_two_ints() { std::vector<A> v = boost::assign::list_of<A>(1,2)(3,4)(5,6); } #if 0 void does_not_work_with_one_int() { std::vector<A> v = boost::assign::list_of<A>(1)(2)(3); } #endif Looking into the code, it seems as if assign_detail::generic_list<A> had two slightly different versions of operator() generated with some preprocessor magic // 1) accepts a fully constructed A generic_list& operator()( const A& u ) { this->push_back( u ); return *this; } // 2) accepts two generic paramenters forwarding them to A's two parameter constructor template <typename U, typename V> generic_list& operator()(const U& u, const V& v) { this->push_back( A(u,v) ); return *this; } I'm missing another operator() that takes one generic parameter and forwards it to A's one parameter constructor, for the case where it is not implicitly convertible. // 3) accepts a generic paramenter forwarding it to A's one parameter constructor template <typename U> generic_list& operator()(const U& u) { this->push_back( A(u) ); return *this; } That saves me from typing A's everywhere std::vector<A> v = boost::assign::list_of(A(1))(A(2))(A(3)); Does this make sense? Thanks!

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[ASIO] work/development flow example
by smbrown＠teledyne.com 27 Aug '09

27 Aug '09

Afternoon all, I'm using the ASIO library to develop a simple application and have a favour to ask. Up until now I have been making many mistakes as I expected, but what I didn't expect was having so much trouble debugging the problems. Perhaps this is normal for applications with threads and callbacks. Any insight you could share about your development work flow and use of debuggers would be gratefully received. I'm using MinGW and VS2K8 on XP and with either debugger trying to find the context of the devassert/exception is hard. Simon P. S. This is a repost, I think our mail server ate the original as I saw no sign of it on the list. Apologies if I'm wrong.

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[boost-users][function_types] Function synthesis and property tags
by yuryk 27 Aug '09

27 Aug '09

I'm trying to synthesize a function type G from another function type F with some changes on return and arg types. What I need to remain constant, are all these additional properties that are returned by components<F>::tag. I want them all as a bunch, don't really fancy querying them all one by one, they sorta look contradictive or at least redundant. The simple approach of passing the same tag to the function_type<Seq, Tag> does not make a change - it leads to the same result as if null_tag were passed. How do you generate a function type with the same properties as the given one? Sample code: //-------------------------------------------------------------------------------------------------- typedef int (__stdcall * pfn1)(char); typedef int ( * pfn2)(char); typedef remove_pointer<pfn1>::type fn1; typedef ft::components<fn1> comps1; // generate type hopefully like pfn1 typedef ft::function_pointer<comps1, //create tag from mask and bits ft::detail::property_tag<comps1::bits::value, comps1::mask::value> >::type pfn_gen1; BOOST_MPL_ASSERT((is_same<pfn_gen1, pfn2>)); // this one passes, should fail, though BOOST_MPL_ASSERT((is_same<pfn_gen1, pfn1>)); // I wish, but fails //-------------------------------------------------------------------------------------------------- -- View this message in context: http://www.nabble.com/-boost-users--function_types--Function-synthesis-and-… Sent from the Boost - Users mailing list archive at Nabble.com.

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[iostreams] how to flush mapped_file
by Stefan Strasser 27 Aug '09

27 Aug '09

Hi, I'm new to the iostreams library, how do you flush/sync a iostreams::mapped_file? iostreams::flush(mapped_file) doesn't seem to work, although it works with a normal file device. are mapped_file's not flushable? the documentation of concept Flushable strangly says that it is an implementation detail, if a device is flushable. it should result in a call to msync() on posix systems and must not be an implementation detail, but the flush must be guaranteed. is this not possible with iostreams? thank you

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[bind] and streaming operators for built in types.
by Robert Jones 26 Aug '09

26 Aug '09

Hi All I've asked a similar question before, but I can't seem to locate the mail or recall the answer! In the code below, how can I eliminate f()? #include "boost/iterator/counting_iterator.hpp" #include "boost/bind.hpp" #include <iostream> using namespace std; using namespace boost; ostream & f( ostream & s, int i ) { return s << i; } int main( ) { for_each( make_counting_iterator( 0 ), make_counting_iterator( 10 ), bind( & f, ref( cout ), _1 ) ); } If I write something like bind( static_cast< ostream & ( * )( ostream &, int ) >( operator << ), ref( cout ), _1 ) the compiler can't locate operator<<() Any thoughts, solutions even? Thanks, - Rob.

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[asio] io_service::run() asserting: "vector iterator not dereferencable"
by Robert Dailey 26 Aug '09

26 Aug '09

Inside of win_iocp_handle_service.write_operation.do_completion_impl(), there is this block of code (Note I'm using Boost 1.40 Beta): #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) // Check whether buffers are still valid. typename ConstBufferSequence::const_iterator iter = handler_op->buffers_.begin(); typename ConstBufferSequence::const_iterator end = handler_op->buffers_.end(); while (iter != end) { boost::asio::const_buffer buffer(*iter); boost::asio::buffer_cast<const char*>(buffer); ++iter; } #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) The call to buffers_.begin() is causing the assert. Looks like a container is getting invalidated/corrupted somehow. I have no idea why this is happening. I'm calling io_service::run() from its own worker thread in a continuous loop like so: for(;;) { boost::this_thread::sleep( boost::posix_time::milliseconds( 20 ) ); m_service.run(); } The class that is wrapping the io_service and serial_port objects invokes a post at construction (from the main thread), to start off a transparent yet continuous chain of reads over the serial port: m_service.post( boost::bind( &SerialClient::DoRead, this ) ); After that, externally I call a function that posts a write in a similar way. This write occurs after the above post for the read: m_service.post( boost::bind( &SerialClient::DoWrite, this, data ) ); When I step through the sequence of events, I see the following happen: - io_service and serial_port are constructed and initialized - io_service thread is started (But run() has not been called yet) - The DoRead() is posted to the io_service - The DoWrite() is posted to the io_service - io_service.run() is called from the worker thread for the first time - DoRead() is called from io_service::run(), which in turn calls serial_port::async_read_some() - DoWrite() is called from io_service::run(), which in turn calls boost::asio::async_write() on the serial_port - ReadCompleted() is invoked as the callback from the previous serial_port::async_read_some() call. It does NOT call async_read_some again (for testing, I disabled the looped reading). - After ReadCompleted() scope exits, it throws the assert Not sure what I'm doing wrong. Keep in mind that this whole time the COM port is not connected to anything, but I'm not sure if this will have anything to do with it. I've attached the code just in case you don't mind looking over it. --------- Robert Dailey

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Question with the date_time libraries: microsec_clock::local_time()
by Kit Li 26 Aug '09

26 Aug '09

Hi, I'm new to Boost and am trying to utilize the date_time libraries. I'm trying use the library in XP. Here's the code I'm testing: ptime now = microsec_clock::local_time(); tz_database tz_db; tz_db.load_from_file("c:/boost/libs/date_time/data/date_time_zonespec.csv"); time_zone_ptr nyc = tz_db.time_zone_from_region("America/New_York"); local_date_time ldt(now.date(),now.time_of_day(), nyc, true); stringstream ss; local_time_facet* output_facet = new local_time_facet(); ss.imbue(locale(locale::classic(), output_facet)); output_facet->format("%Y%m%d, %H:%M:%S %F %z"); ss.str(""); ss << ldt; cout << ss.str() << endl; The question i have is with "microsec_clock::local_time();". I tested second_clock::local_time() and the time is correct, for example 20090826, 15:14:55 EDT. However, when I use microsec_clock::local_time();, I'd get 19700506, 19:44:32.970074 EDT. Is there a conversion somewhere that I'm missing? Thanks for the help. - Bill

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Shared mutex vs normal mutex
by Alessandro Bellina 26 Aug '09

26 Aug '09

Hello I am testing the boost mutex/lock classes in order to implement a multiple reader single writer model. Because of this I thought that the shared mutex with lock_shared and lock_unique would be perfect. I'm finding that the performance is no better than with a simple mutex. My writer is adding a bunch of elements, locking the shared container exclusivelly until it is done. The readers looks at all elements of the container, locking on a per element basis. Any ideas as to why the shared mutex would be slower in this case than the simple mutex? This is the code for my producer thread and my consumers (as a side note, employee_set is a multi index): typedef boost::shared_mutex mutex_type; typedef boost::shared_lock<mutex_type> read_lock_type; typedef boost::unique_lock<mutex_type> write_lock_type; static mutex_type rw_mutex; struct ConsumerThread{ ConsumerThread (employee_set* e):es(e){} void operator()(){ for (int i=0; i<es->size(); i++){ read_lock_type l(rw_mutex); es->get<1>(); } } employee_set* es; }; struct ProducerThread{ ProducerThread(int n, employee_set* e):N(n),es(e){} void operator()(){ write_lock_type l(rw_mutex); for (int i=0; i<N; i++){ es->insert (employee(i, "TestEmployee",100-i)); } l.unlock(); } int N; employee_set* es; };

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makefile
by Shaolin 26 Aug '09

26 Aug '09

Hi Guys How do I include boost dependencies in my makefile ? /usr/local/boost_1_39_0/boost/stage/lib/libboost_program_options-gcc43-mt-1_39.a /usr/local/boost_1_39_0/boost/stage/lib/libboost_thread-gcc43-mt-1_39.a -lpthread

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[asio] poor read performance with 10Mb
by Perry, Daniel 26 Aug '09

26 Aug '09

Hello, I've tried searching the archives without much luck, so here goes... I'm using version 1.37 of the boost libraries and I've implemented a SCGI, http://python.ca/scgi/protocol.txt <http://python.ca/scgi/protocol.txt> , server using the HTTP Server 3 as a starting point. Everything works fine for small requests ~1k, but when I try to send ~10 Mb through the performance is awful. It takes ~90 seconds to transfer the data locally on my pc from one app to another. I've tried profiling the code assuming that I was wasting time somewhere in my code, but the profiler should that the threads that were processing the requests where blocked most of the time and not doing anything. The buffer size that I use to read with is 128kb. I not sure what other information is helpful to diagnose what I'm doing wrong. Any help would be appreciated. Regards, Daniel Perry

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shared_array const member function
by Daya S. Prasad 26 Aug '09

26 Aug '09

Can any body please tell me why operator[] is defined in case of shared_array<T> like this way: Type & operator[](std::ptrdiff_t) const; It reports compile time error. Consider the code: class Widget { std::string classId; public: std::string getClassId() const { return classId; } }; int main() { boost::shared_array<Widget> obj(new Widget[10]); std::string id = obj[7].getClassId (); // Error } In my opinion operator function should be defined as follows: const Type & operator[](std::ptrdiff_t) const; Type & operator[](std::ptrdiff_t) ; Please clear my consfusion. Thanks in advance.

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[bind] Will not compile when passing parameter by-value
by Robert Dailey 26 Aug '09

26 Aug '09

Hello, I have a class called ByteSink that has a move constructor and move assignment operator. I pass an object of type ByteSink into bood::bind() by-value and it fails to compile. First, here is my call to boost::bind(): void SerialClient::Write( ByteSink data ) { m_service.post( boost::bind( &SerialClient::DoWrite, this, data ) ); } The error message I'm getting will be located at the very bottom of this message to prevent clutter. Note that I am compiling on MSVC9 under Windows. Below is what my move constructor/assignment function prototypes look like for ByteSink: /// Uses move semantics. ByteSink( ByteSink& other ); /// Uses move semantics. ByteSink& operator= ( ByteSink& other ); And the compiler error I'm getting (It's a bit lengthy) is below. Any idea what is causing this? My best guess is that boost::bind() is using const somewhere, and it cannot find a copy constructor that takes a const ByteSink as a parameter, since I'm not using a typical copy constructor. 1>C:\IT\third_party\boost_1_40_0_beta1\boost/bind/bind.hpp(859) : error C2558: class 'boost::_bi::list2<A1,A2>' : no copy constructor available or copy constructor is declared 'explicit' 1> with 1> [ 1> A1=boost::_bi::value<SerialClient *>, 1> A2=boost::_bi::value<ByteSink> 1> ] 1> C:\IT\third_party\boost_1_40_0_beta1\boost/bind/bind.hpp(859) : while compiling class template member function 'boost::_bi::bind_t<R,F,L>::bind_t(F,const L &)' 1> with 1> [ 1> R=void, 1> F=boost::_mfi::mf1<void,SerialClient,ByteSink>, 1> L=boost::_bi::list2<boost::_bi::value<SerialClient *>,boost::_bi::value<ByteSink>> 1> ] 1> ..\SerialClient.cpp(32) : see reference to class template instantiation 'boost::_bi::bind_t<R,F,L>' being compiled 1> with 1> [ 1> R=void, 1> F=boost::_mfi::mf1<void,SerialClient,ByteSink>, 1> L=boost::_bi::list2<boost::_bi::value<SerialClient *>,boost::_bi::value<ByteSink>> 1> ]

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[asio] serial_port question
by Robert Dailey 26 Aug '09

26 Aug '09

When reading information from a serial_port, it seems like I'm required to poll the port for data. Is it possible to receive asynchronous events when data is available, kind of like how TCP/IP works? --------- Robert Dailey

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regex icase
by Michał Nowotka 26 Aug '09

26 Aug '09

Hello, in the following class: class MyClass : public boost::regex {...} I want to be able to switch between case-sensitive and non-sensitive matching so i defined this method: void MyClass::setIgnoreCase(bool ignoreCase /* = true */) { assign(str(), ignoreCase? (flags() | boost::regex::icase) : (flags() | (~boost::regex::icase))); } but then I get segmentation fault. I know this is caused by bitwise negation (~) but i don't know why. Do you? -- Pozdrawiam Michał Nowotka

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