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[Boost.Test] User Exception handling
by Ewgenij Sokolovski 28 Aug '07

28 Aug '07

Hello. On the webpage I read: In case if your test cases may throw custom exceptions (see here for list of exceptions translated by default), you could register translator specific for that exception. http://www.boost.org/libs/test/doc/components/utf/index.html So, if I understand it right, if I throw some custom exception in my test program and do not catch it, then it is catched by the boost test framework and reported in the proper way - if the exception can be translated by default. Now I look at the exceptions, which can be translated by default and see: In majority of the cases the monitored function doesn't need to throw the boost::execution_exception to report an error in the Execution Monitor. If you want a custom error message to be included into the execution_exception's error message, use one of the following C++ types as an exception: * C string. * std:string. * any exception class in std::exception hierarchy. http://www.boost.org/libs/test/doc/components/execution_monitor/index.html#… So, I can use a C string for my exception. I have written a small example test case and included throwing of an uncaught exception in it: try{ throw "blub"; } catch(char* ex){ throw; } As I started the testing process I didn't get a "blub"-Exception message, but Boost.Test internal framework error: unknown reason So, what's wrong? Why is "blub" not reported as "blub"? Can anybody explain that? Regards Ewgenij

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Serialization in an array
by Hansi Hansi 27 Aug '07

27 Aug '07

Hello, is it possible to serialize a class in a byte-array(e.g. array stream)? best regards Hansjörg _______________________________________________________________________ Jetzt neu! Schützen Sie Ihren PC mit McAfee und WEB.DE. 3 Monate kostenlos testen. http://www.pc-sicherheit.web.de/startseite/?mc=022220

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boost::thread Destructor being called multiple times
by kaliwanagan 27 Aug '07

27 Aug '07

I was just curious as to why the class destructor are (apparently) being called multiple times. I have tried searching the archives to no avail (which prompted me to register and post to the mailinglist). #include <boost/thread/thread.hpp> struct TestingClass { TestingClass() { std::cout << "constructor called" << std::endl; } ~TestingClass() { std::cout << "destructor called" << std::endl; } void operator()() { std::cout << "operator() called" << std::endl; } } testclass; void testBoostThread() { boost::thread thrd (testclass); thrd.join(); } int main () { testBoostThread(); return 0; } The output: constructor called destructor called destructor called destructor called destructor called operator() called destructor called I would appreciate if someone can enlighten me on this. Will having the destructor called multiple times be a cause of concern? Will it cause some undefined symptoms? Is there a way to completely avoid this situation?

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[boost-users][serialization]How to build the whole serialization regression test suite?
by wei niu 27 Aug '07

27 Aug '07

I find run_archive_test.bat, runtest.bat and Jamfile in boost_1_33_1\libs\serialization\test folder. Then I executed run_archive_test.bat,it output: run_archive_test "<test header file>" "<toolset>" "[<boost root directory>]" "[<target directory>]" I didn't know how to give a proper parameter of "test header file".So after reading runtest.bat file I entered command "bjam --dump-test -sTOOLS=vc-7_1 test". It really worked and generated a lot of folders in boost_1_33_1\bin\boost\libs\serialization\test folder and fast consumed all of the free 0.9GB storage space. But I still didn't know how to run so much test files.I executed one of them,it reported sth like "cannot find test_main function".

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[Serialization]Cannot serialize pointer -- newbie needs help
by wei niu 27 Aug '07

27 Aug '07

I cannot serialize an object through a pointer.When running the program,it reports: This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. Below is the code : ////////////////////////////////////////////////////////////////////////////////////////////// // // static link library: libboost_serialization-vc71-s-1_33_1.lib // ////////////////////////////////////////////////////////////////////////////////////////////// #include <iostream> #include <fstream> #include <list> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/list.hpp> using std::cout ; using std::endl ; class gps_position { public: int m_degrees ; int m_minu float m_seconds ; gps_position() { m_degrees = m_minutes = m_seconds = 0 ; } gps_position( int degrees, int minutes, float seconds ) { m_degrees = degrees ; m_minutes = minutes ; m_seconds = seconds ; } }; std::ostream& operator << ( std::ostream &out, const gps_position &g ) { return out << g.m_degrees << '\'' << g.m_minutes << '\'' << g.m_seconds; } namespace boost{ namespace serialization{ template <class Archive> void serialize( Archive &ar, gps_position &g, const unsigned int version ) { ar & g.m_degrees ; ar & g.m_minutes ; ar & g.m_seconds ; } } } class bus_stop { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & latitude; ar & longitude; } gps_position latitude; gps_position longitude; protected: bus_stop(const gps_position & lat_, const gps_position & long_) : latitude(lat_), longitude(long_) {} public: bus_stop(){} // See item # 14 in Effective C++ by Scott Meyers. // re non-virtual destructors in base classes. virtual ~bus_stop(){} friend std::ostream& operator << ( std::ostream &out, const bus_stop &bs ) ; }; std::ostream& operator << ( std::ostream &out, const bus_stop &bs ) { return out << bs.latitude << '\t' << bs.longitude ; } class bus_stop_corner : public bus_stop { friend class boost::serialization::access; std::string street1; std::string street2; virtual std::string description() const { return street1 + " and " + street2; } template<class Archive> void serialize(Archive &ar, const unsigned int version) { // save/load base class information ar & boost::serialization::base_object<bus_stop>(*this); ar & street1 & street2; } public: bus_stop_corner(){} bus_stop_corner(const gps_position & _lat, const gps_position & _long, const std::string & _s1, const std::string & _s2 ) : bus_stop(_lat, _long), street1(_s1), street2(_s2) { } friend std::ostream& operator << ( std::ostream &out, const bus_stop_corner &bsc ) ; }; std::ostream& operator << ( std::ostream &out, const bus_stop_corner &bsc ) { return out << dynamic_cast<const bus_stop&>(bsc) << ' ' << bsc.description() ; } class bus_route { friend class boost::serialization::access; bus_stop * stops[2]; template<class Archive> void serialize(Archive & ar, const unsigned int version) { int i; for(i = 0; i < 2; ++i) ar & stops[i]; } public: bus_route() { stops[0] = stops[1] = 0 ; } bus_route( bus_stop *bs1, bus_stop *bs2 ) { stops[0] = bs1, stops[1] = bs2 ; } }; int main() { const char *file_name = "non_intrusive.dat" ; bus_stop *bs0 = new bus_stop_corner( gps_position(34, 135, 52.560f), gps_position(134, 22, 78.30f), "24th Street", "10th Avenue" ); bus_stop *bs1 = new bus_stop_corner( gps_position(35, 137, 23.456f), gps_position(133, 35, 54.12f), "State street", "Cathedral Vista Lane" ); const bus_route br( bs0, bs1 ) ; { std::ofstream ofs( file_name ) ; boost::archive::text_oarchive oa( ofs ) ; oa << (br) ; } bus_route newbr ; { std::ifstream ifs( file_name ) ; boost::archive::text_iarchive ia( ifs ) ; ia >> newbr ; } return 0 ; } I think maybe it's because I didn't build the serialize library correctly.Ibuilded it with bjam.When debuging it with VS2003,an exception was thrown in the _heap_alloc_base (size_t) function at line 211: line 211: return HeapAlloc(_crtheap, 0, size); Function "void * __cdecl _heap_alloc_base (size_t size)" is in malloc.c.

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[1.33] [signals] auto_ptr and boost::signals
by Seweryn Habdank-Wojewódzki 26 Aug '07

26 Aug '07

Dears I have question. Why there are problems to connect function that returns auto_ptr to the signal? Below there is a code which won't compile i line where is comment. Regards. #include <iostream> #include <boost/signals.hpp> #include <boost/shared_ptr.hpp> #include <boost/bind.hpp> #include <memory> #include <vector> #include <iterator> #include <algorithm> class some_class { public: ::std::vector <int> func1() { using ::std::vector; typedef vector <int> Res; Res res (2); res.at(0) = 13; res.at(1) = 14; return res; } ::boost::shared_ptr < ::std::vector <int> > func2() { using ::std::vector; using ::boost::shared_ptr; typedef shared_ptr < vector <int> > Res; Res res (new vector<int> (2)); res->at(0) = 23; res->at(1) = 24; return res; } ::std::auto_ptr < ::std::vector <int> > func3() { using ::std::vector; using ::std::auto_ptr; typedef auto_ptr < vector <int> > Res; Res res (new vector<int> (2)); res->at(0) = 33; res->at(1) = 34; return res; } }; int main() { using ::boost::signal; using ::std::vector; using ::std::auto_ptr; using ::boost::shared_ptr; using ::boost::bind; some_class sc; signal < vector <int> (void) > sig1; signal < shared_ptr < vector <int> > (void) > sig2; signal < auto_ptr < vector <int> > (void) > sig3; sig1.connect (bind (&some_class::func1,&sc)); vector <int> ret1 (sig1()); ::std::copy (ret1.begin(), ret1.end(), ::std::ostream_iterator<int> (::std::cout, "\n")); sig2.connect (bind (&some_class::func2,&sc)); vector <int> ret2 (*sig2()); ::std::copy (ret2.begin(), ret2.end(), ::std::ostream_iterator<int> (::std::cout, "\n")); sig3.connect (bind (&some_class::func3,&sc)); //sig3(); // <- ERROR } -- |\/\/| Seweryn Habdank-Wojewódzki \/\/

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Boost Unit Test Undefined Reference
by cmicel1＠cct.lsu.edu 26 Aug '07

26 Aug '07

Am I missing something when I get undefined references to main using boost 1.34.1. Here is a minimal example #include <iostream> #include <boost/test/unit_test.hpp> void my_test_function() { std::cout << "hi there" << std::endl; } boost::unit_test::test_suite* init_unit_test_suite( int , char*[] ) { boost::unit_test::test_suite* test = BOOST_TEST_SUITE( "Master test suite" ); test->add( BOOST_TEST_CASE( &my_test_function ) ); return test; } This is copied off of the main page. Here is the compilation line g++ test.cpp -o test -lboost_unit_test_framework-gcc41 With gcc version 4.1.2 Here is the error message: /usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../lib/crt1.o: In function `_start': (.text+0x18): undefined reference to `main' collect2: ld returned 1 exit status Any insight? Chris Miceli

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Re: [Boost-users] boost::thread Destructor being called multiple times
by Nat Goodspeed 26 Aug '07

26 Aug '07

At 09:51 AM 8/25/2007, kaliwanagan wrote: >I was just curious as to why the class destructor are (apparently) >being called multiple times. I have tried searching the archives to no >avail (which prompted me to register and post to the mailinglist). Try defining an explicit copy constructor with a message like the others. I believe the issue is that your object is being passed by value, and being copied a few times along the way. You're not seeing your no-args constructor message because the other new instances are invoking the copy constructor.

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Unable to work out a Composite predicate.
by PJ Durai 25 Aug '07

25 Aug '07

Hello everyone, I am not able to figure out the correct syntax for something I am trying to do. The following works as expected. It filters all the 'new' events into a new vector. remove_copy_if ( myEvents.begin(), myEvents.end(), back_inserter(newEvents), !(boost::bind(&Event::GetEventType, _1) == EventType_New)); I cant figure out how to get a complex conditional working as the predicate. e.g. remove_copy_if ( myEvents.begin(), myEvents.end(), back_inserter(newEvents), (boost::bind(&Event::GetEventType, _1) == NotesEventType_New) && (boost::bind(&Event::GetEventID, _1) == 1000 ) ); I have tried various ways of putting parens around this expression. I just couldn't get it to compile. Is that even possible ? Please Advise. I am using Visual C++ 2005 SP1 on Windows XP SP2. Appreciate your time. thanks pj

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Re: [Boost-users] Serialization newbie needs help
by Dominick Layfield 25 Aug '07

25 Aug '07

"Robert Ramey" <ramey(a)rrsd.com> wrote: >> goes away. Any chance this could be added to a boost::serialization >> FAQ? > > you mean change the section named "rationale" to "FAQ"? Ermm... Yes, I suppose so. There ought to be some section that a newbie who is having problems would immediately look to see if this is a common problem. In my browser, the "Rationale" section of the documentation appears unexpanded by default. And even when I expand it, "Compile time trap when saving a non-const value" doesn't seem (when skimming the docs) relevant to the static assertion error. It also didn't appear in my Google search for the cryptic error message that the compiler produced. >> The "Compile time trap" section of the documentation doesn't actually >> explain what "object tracking" is all about. Neither (amusingly) >> does the Boost->Serialization->Reference->Special >> Considerations->Object Tracking section! > > Hmmm - well it's intended to. Maybe I just thought the meaning of the > term "Object Tracking" obvious. As a newbie, I can tell you that it wasn't obvious to me! :-) As I said, I wouldn't have expected the serialization library to do any automagical pointer stuff, so from this perspective, it's very hard to see what object tracking is, and why it would be necessary. >> What on earth does it actually mean to serialize a pointer? > > Exactly what you think it means - see above. Well, once you've got an idea in your head about what should happen when a pointer is serialized (and had that concept for years, and written a whole library to implement it!), it probably seems obvious and "natural" that it should work that way. But to a newbie (to boost::serialization, not to C++), this behavior is rather surprising. For example if I do: my_class mc; my_class* mc_ptr = &mc; cout << mc_ptr; I don't get the my_class object sent to stdout. I get the value of the pointer itself. If I wanted the actual object displayed, I would dereference the pointer. So my intuition would be that boost::serialization would work in a similar way: if I wanted the object itself output/input, I would do it explicitly. I'm not trying to say that your approach is wrong. All I'm attempting to point out is that other people may have very different (and quite reasonable) expectations about what should happen. >> And why would I want to do such a thing, anyway? > > I don't know what your application is. Sorry. What I meant was "Why would someone want this?" or "Why is this a useful feature?" Fundamentally, there are two approaches to dealing with pointer serialization: (1) disallow it altogether; or (2) serialize the pointed-to object, and do all the clever object-tracking stuff. The first approach has the benefit of simplicity . So the only reason to take the second approach would be if automagic pointer serialization is really useful. However, I can't think of an example of when this would be really useful. Hence my question. But if you could provide me an example of when pointer serialization shines, then I would say "Aha! Now I understand why Robert went to so much trouble to make this work.", and I could be at peace with the world again! :-) BTW, I don't want to sound like I'm bashing your library, so let me end with a compliment. I think the symmetric design of serialize(), with the same function used for both input and output, is one of the prettiest idioms I've seen in years. -- Dominick

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[boost::multi-index] improvement suggestion
by Ovanes Markarian 24 Aug '07

24 Aug '07

Hello all, working with boost multi-index container requires sometimes some effort in regards of correct tagging (or at least some typing work ;). I found the following approach to be useful and may be it can be integrated in the multi-index library. First of all the dealing with searchable collections (STL collections are no exception) can be really nasty in regards of finding an iterator and comparing it with the end iterator. The following function can really be of help: /// template function to dermine if the container contains the key specified /// @param T - container type /// @param K - key type /// @param container - container to search for a key /// @param key - key to be found in the container /// \return iterator_range containing the begin and end iterator of the found key. begin iterator equals end iterator the range is empty => nothing found template<class T, class K> inline boost::iterator_range<typename T::const_iterator> find_range(T const& container, K const& key) { return boost::make_iterator_range(container.find(key),container.end ()); } //non-const version follows as well ... Actually iterator_range defines a "bool"- and "!"- (NOT) operators. iterator_range is returned by this function. Therefore constructs like: std::set<std::string> some_set; if(!find_range(some_set, "my_key")) some_set.insert("my_key"); are possible without the need of accesing the underlying iterator types or explicitly comparing the found iterator with the end iterator. The next step dealing with Multi-Index container turned out in multiple typedefs for every tagged type. The main disadvantage in this approach was to constantly retrieve the required container view and related iterator, so I came up the the following class: /// helper class used to retrieve multi-index values dependent on the view tag template<class Tag_, class MultiIndex_> struct value_retrieval { /// type definition used to produce tag dependent view typedef typename MultiIndex_::index<Tag_>::type view_type; /// type definition for the const iterator through the view typedef typename view_type::const_iterator citer_type; /// iterator range used to represent the result typedef boost::iterator_range<citer_type> result_type; /// initializing ctor /// initializes the contained view by using the specified Tag_ type value_retrieval(MultiIndex_ const& mi) : view_(mi.get<Tag_>()) {} /// find a type at the key specified /// @param LookUpType_ - key type /// @param key - key instance to be found template<class LookUpType_> result_type at(LookUpType_ const& key)const { return find_range(view_, key); } private: /// view reference view_type const& view_; }; This class deals with constant views, since I did not require changeable ones, but as one can see the "at"-function can either be used to identify the found iterator range or just to make a check if such a key exists. Dealing with this type is more easier, as to define multi-index accessed view and iterator types. Sample typedef multi_index_container < some_type , indexed_by < .... > > my_container; typedef value_retrieval<my_container, tag_name> by_name; typedef value_retrieval<my_container, tag_value> by_value; //somewhere in code by_name value_by_name(some_container_inst); //if typename is required prefix it... by_name::result_type r = value_by_name.at("some key"); if(r) /// do smth with r Best Regards, Ovanes

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Serializeable Boost hashmap with vector<long> as key
by Oliver Kania 24 Aug '07

24 Aug '07

Hello ! I am looking for a hashmap that is boost::serializeable, has good performance and is implemented by boost-means. Furthermore, it must have vector<long> as key type. I tried multiindex, but it seems one cannot have keys that are not members of the value type. Boost Bimap is not serializeabel and i do not need the bimap functionality. regards, Oliver

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boost program_options "count" question
by F David Sacerdoti 24 Aug '07

24 Aug '07

As per Volodya's suggestion, posting this question here. He mentioned it had been discussed, but I was unable to find anything appropriate using search engines. I apologize in advance if this is a repeat question. Hi, I am trying to do a simple thing with your program_options boost library: I have a program foo, and I want to invoke it like this: foo -d -d -d I want foo to know "I have counted three -d". I followed your tutorial and tried this: desc.add_options() ("debug,d",po::value< vector<int> >()->default_value(1), "Debug level") ; po::variables_map vm; po::store(po::parse_command_line(argc, argv, desc), vm); po::notify(vm); if (vm.count("debug")) { cout << "Running, debug level: " << vm["debug"].as< vector<int> >().size() << "\n"; } But it did not work, always prints "debug level: 0". For background, this is to make the program compatible with a Python implementation which uses optparse. I have an extensive testing framework that assumes this behavior and it would be nice to implement the same with program_options. Thanks, Federico

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error C2976 in python tutorial?
by Guido Ziliotti 24 Aug '07

24 Aug '07

Probably Has anybody faced error C2976: 'boost::python::class_' : too few template arguments? Compiler msvc-8.0. BOOST_PYTHON_MODULE(hello){ class_<World>("World") .def("greet", &World::greet) .def("set", &World::set) ; } produced that. Source code follows. #include <string> char const* greet() { return "hello, world"; } struct World { void set(std::string msg) { this->msg = msg; } std::string greet() { return msg; } std::string msg; }; #include <boost/python/module.hpp> #include <boost/python/def.hpp> using namespace boost::python; //nota che la funzione globale va prima BOOST_PYTHON_MODULE(hello) { def("greet", greet); class_<World>("World") .def("greet", &World::greet) .def("set", &World::set) ; }

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[test] Uncaught exception in BOOST_CHECK_THROW() causing SIGABRT
by Richard Dingwall 24 Aug '07

24 Aug '07

Hi there, I thought I'd post this because A) it might save someone a lot of head-scratching and B) there aren't any posts on it already. The short of it is, that if you have a setup similar to the following (i.e., an empty throw() clause on a template specialisation): template<class output_type> output_type do_something(int input_value) throw(std::invalid_argument); template<> int do_something(int input_value) throw(std::invalid_argument); template<> long do_something(int input_value) throw(); And attempt to test throwing a std::invalid_argument from within the long specialised function, e.g.: // note: an argument less than zero will throw a std::invalid_argument BOOST_CHECK_THROW(do_something<long>(-1), std::invalid_argument); You will see something the following: Running 4 test cases... terminate called after throwing an instance of 'std::invalid_argument' what(): Input value too low. unknown location(0): fatal error in "long_throw": signal: SIGABRT (application abort requested) sigabrt_test_suite.cpp(58): last checkpoint *** 1 failure detected in test suite "sigabrt tests" My function is throwing a std::invalid_argument and my test case been programmed to catch it. But it doesn't. This had me scratching my head for a few days, until I noticed the empty throw() clause. Completing it resolved the problem immediately. I'm not sure if this is expected behaviour, but if anyone's interested, a test case is attached. I'm using gcc version 4.0.1 (Apple Computer, Inc. build 5367) on a G4 Powerbook with whatever was in Boost's SVN trunk on August 6. Cheers, Richard

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Multi Array Question
by chris dion 24 Aug '07

24 Aug '07

Hi I'm having a problem with the boost/multi_array and I'm hoping someone here can help, or at least explain why the following doesn't work. The problem: I have a multi_array of ints that I want to be able to view as being either row major or column major to simplify a number algorithms. I don't want to change the internal representation of the array (the default c++ row major storage layout is fine), I just want to be able to interchange the indexing order from array[row][col] to array[col][row] for the same multi_array. To do so, I attempted to define 2 array_views of the same multi_array with different stride values, like this: #include <iostream> using namespace std; #include <boost/multi_array.hpp> using namespace boost; int main(void) { typedef multi_array<int, 2> intarray2; typedef intarray2::array_view<2>::type intarray2view2; typedef intarray2::array_view<1>::type intarray2view1; typedef intarray2::index_range intarray2range; intarray2 arr(extents[3][3]); // test data int a = 0; for (int r = 0; r < 3; r++) { for (int c = 0; c < 3; c++) { arr[r][c] = a++; } } intarray2view2 rows = arr[indices[intarray2range().stride(3)][intarray2range().stride(1)]]; intarray2view2 cols = arr[indices[intarray2range().stride(1)][intarray2range().stride(3)]]; /* 0 1 2 3 4 5 6 7 8 */ cout << rows[2][1]; // i expect this to print 7 cout << cols[2][1]; // i expect this to print 5 } Unfortunately, this doesn't work at all (an assert fails when indexing the views). I debugged (using Visual C 2005), and found that the 'rows' array_view has a stride collection of [9, 1], while the 'cols' array_view stride collection is [3, 3]. Both are different than what I specified during construction. It appears that they're being multiplied by the extents of the first dimension of the multi_view array (in this example: 3). I can produce a column major view of a single column of the array using a 1 dimensional view constructed using a degenerate range, like this: intarray2view1 col= arr[indices[1][intarray2range()]]; // column 1 in arr but that's not what I'm hoping to achieve. Can someone explain the behavior above and/or suggest a way of creating a 2d column major array_view of a 2d multi_array? Thanks - Chris Dion _________________________________________________________________ Show Your Messenger Buddies How You Really Feel http://www.freemessengeremoticons.ca/?icid=EMENCA122

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Construction/assignment inconsistency with boost::function on MSVC2005
by Josef Grahn 23 Aug '07

23 Aug '07

Hello, I encountered the following inconsistency constructing a boost::function object from a pointer to a template function. template <typename T> void foo(T) {} int main(int argc, char **argv) { boost::function<void (int)> f1; f1 = foo<int>; boost::function<void (int)> f2 = foo<int>; f1(0); // ok f2(0); // error, function pointer is zero! return 0; } I am compiling on MSVC2005 SP1, using boost version 1.34.1. It seems to work properly with GCC 4.1.2 and boost 1.33.1 on Ubuntu, however. Is this a known problem? Best Regards, Josef Grahn

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Re: [Boost-users] [boost] ScopeExit Review Begins Today
by Jody Hagins 23 Aug '07

23 Aug '07

The discussion threads included comments from several people who did not offer an actual review and/or YES/NO. I have filtered every message with either scope or exit in the subject, and I want to make sure I have all the reviews. If your name is in this list, that means I have a YES/NO review from you. Otherwise, I may see some discussion from you, but no YES/NO review. If your name is NOT in this list, but you feel you provided a review, please point me to your review posting, or provide appropriate clarification. The fact that you participated in the discussion does not mean that I know your opinion on the acceptance of ScopeExit. In addition, I have received a few reviews via private email. For the sake of fairness and openness, I asked the authors to send their review to the list. I will not consider them unless they appear in the open mailing list. Thanks for your cooperation! Kim Barrett Aaron LaFramboise Steven Watanabe Ben Kuppers Andrey Semashev Peder Holt Goran Mitrovic Johan Nilsson Pavel Vozenilek Tom Brinkman Maxim Yanchenko

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Re: [Boost-users] [boost] ScopeExit Review Begins Today
by Jody Hagins 23 Aug '07

23 Aug '07

Thanks for all the input on Alexander's ScopeExit submission. There are some good discussions, so please continue them over the next day or so if necessary. I am very busy this weekend (I am HC of a high school football team, and our first game is tomorrow night), but I will render a conclusion some time next week. Again, thanks for the input.

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ptr_container problem
by Aljaz 23 Aug '07

23 Aug '07

Hello I'm trying to use ptr_vector but I'm having headaches because I have no idea why I'm getting this error: error C2248: 'boost::ptr_container_detail::reversible_ptr_container<Config,CloneAllocator>::operator =' : cannot access private member declared in class 'boost::ptr_container_detail::reversible_ptr_container<Config,CloneAllocator>' with [ Config=boost::ptr_container_detail::sequence_config<boost::asio::dns::base_nameserver_resource,std::vector<void *,std::allocator<void *>>>, CloneAllocator=boost::heap_clone_allocator ] C:\Program Files\boost\boost_1_34_0\boost/ptr_container/detail/reversible_ptr_container.hpp(287) : see declaration of 'boost::ptr_container_detail::reversible_ptr_container<Config,CloneAllocator>::operator =' with [ Config=boost::ptr_container_detail::sequence_config<boost::asio::dns::base_nameserver_resource,std::vector<void *,std::allocator<void *>>>, CloneAllocator=boost::heap_clone_allocator ] This diagnostic occurred in the compiler generated function 'boost::ptr_sequence_adapter<T,VoidPtrSeq,CloneAllocator> &boost::ptr_sequence_adapter<T,VoidPtrSeq,CloneAllocator>::operator =(const boost::ptr_sequence_adapter<T,VoidPtrSeq,CloneAllocator> &)' with [ T=boost::asio::dns::base_nameserver_resource, VoidPtrSeq=std::vector<void *,std::allocator<void *>>, CloneAllocator=boost::heap_clone_allocator ] My code (simplified): class base1 { public: void somefunc() { }; }; class main : public base1 { public: virtual void somefunc() { } }; class derived : public main { public: virtual void somefunc() { } }; boost::ptr_vector<main> m_vector; Any Idea what am I doing wrong? I tried to add do_clone functions/members without success. Any help is highly appreciated Regards A

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ScopeExit Review ends tomorrow (Wednesday)
by Jody Hagins 23 Aug '07

23 Aug '07

The ScopeExit review ends on Wednesday, August 22. If you want to have input on its acceptance into Boost, please provide a review by tomorrow. BTW, we need more input ;-) Thanks! >From the original announcement... The review period for Scope Exit Time Series, submitted by Alexander Nasonov, runs from Monday, August 13 until Wednesday, August 22. >From the documentation: Nowadays, every C++ developer is familiar with RAII technique. It binds resource acquisition and release to initialization and destruction of a variable that holds the resource. But there are times when writing a special class for such variable is not worth the effort. This is when ScopeExit macro comes into play. You put resource acquisition directly in your code and next to it you write a code that releases the resource. Note that ScopeExit uses PP macros and relies on Boost.Typeof. The latest version can is here: http://boost-consulting.com/vault/index.php?action=downloadfile&filename=sc… It's available also at http://tinyurl.com/2z6qg2 Online documentation is here: http://194.6.223.221/~nasonov/scope_exit-0.04/libs/scope_exit/doc/html/inde… >From the review guidelines here: http://boost.org/more/formal_review_process.htm ... Boost mailing list members are encouraged to submit Formal Review comments: * Publicly on the mailing list. * Privately to the Review Manager. Private comments to a library submitter may be helpful to her or him, but won't help the Review Manager reach a decision, so the other forms are preferred. What to include in Review Comments Your comments may be brief or lengthy, but basically the Review Manager needs your evaluation of the library. If you identify problems along the way, please note if they are minor, serious, or showstoppers. Here are some questions you might want to answer in your review: * What is your evaluation of the design? * What is your evaluation of the implementation? * What is your evaluation of the documentation? * What is your evaluation of the potential usefulness of the library? * Did you try to use the library? With what compiler? Did you have any problems? * How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? * Are you knowledgeable about the problem domain? And finally, every review should answer this question: * Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. Thanks in advance to every for your participation in this review. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Boost fixed point data type or other support for monetary values?
by Jeff Dunlap 23 Aug '07

23 Aug '07

Hello, I'm having some rounding problems using the double data type on some financial calculations. Does Boost have a fixed point data type or is there other functionality that may be helpful to me? Any suggestions would also be appreciated. Thanks very much

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basic file io in boost 1_34_1. A compilable 'hello world' example for large (>2^31byte) files?
by Peter Leopold 23 Aug '07

23 Aug '07

Dear Boost Users, I've used boost on and off for years for its string parsing. Now I'd like to use it to replace std::ifstream for file reading. The immediate requirement is a file > 2^31 bytes. Since my requirement is to replace ifstream, I was hoping for a fairly simple transition, perhaps even something I could manage with an emacs global search-and-replace. I started with kubuntu-feisty's boost 1.33.1. but was unable to execute the first main in the iostreams tutorial Overview (2.1.1). The showstopper was the compiler error <file_sink> not defined in scope. % g++ test.cpp test.cpp: In functin 'int main()': test.cpp::9: error: 'file_sink' was not declared in this scope . . . several more errors. This is an error without precedent, at least according to google. Thinking this is a kubuntu-apt-get issue, I downloaded and rebuilt and installed boost 1_34_1 from scratch. Alas, <file_sink> is still not declared. Am I doing something obvious wrong? I'm using g++ 4.1.2. Does anyone have a few lines of code that will * open a file? * seekg() to the beginning, end and arbitrary location in the file? * tellg() the present file pointer location in the file? * read(address, number of bytes) from the file? These are the basic STL features I'm trying to replace. Many thanks for any pointers to useful documentation (but not to boost.org/libs/iostreams/doc/index.html, please) or code snippets. Once I have my "hello world" working, I might start making sense of <file_sink> templated streams, and why my install can't find <file_sink> when it is sitting right there in <boost/iostreams/device/file.hpp>!?!? -- Peter Leopold Peter dot Leopold at BioAnalyte dot com <http://www.bioanalyte.com>

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Bad Lexical_Cast!
by Frame Buffer 22 Aug '07

22 Aug '07

Hello! I am trying to compile the following program from *Beyond the C++ Standard Library: An Introduction to Boost. *Here is the source code: #include <iostream> #include <string> #include "boost/lexical_cast.hpp" class lexical_castable { public: lexical_castable() { }; lexical_castable(const std::string s) : s_(s) { }; friend std::ostream& operator<<(std::ostream& o, const lexical_castable& le); friend std::istream& operator>>(std::istream& i, lexical_castable& le); private: virtual void print_(std::ostream& o) const; void read_( std::istream& i ); std::string s_; }; std::ostream& operator<<(std::ostream& o, const lexical_castable& le) { le.print_(o); return o; } std::istream& operator>>(std::istream& i, lexical_castable& le) { le.read_(i); return i; } void lexical_castable::read_( std::istream& i ) { i >> s_; } void lexical_castable::print_( std::ostream& o ) const { o << s_ <<"\n"; } int main(int argc, char* argv[]) { lexical_castable le(); std::cin >> le; int i=0; try { i = boost::lexical_cast<int>(le); std::cout << i << '\n'; } catch(boost::bad_lexical_cast &e) { std::cout << e.what() << '\n'; std::cout << "You were supposed to enter a number!\n"; } } The lexical_cast is throwing an exception as follows: boost::bad_lexical_cast::what returned 0x004c9888 "bad lexical cast: source type value could not be interpreted as target" const char * Note that I have modified the original code a bit because I was trying to figure out what went wrong. The object le is getting created successfully with the user entered "number" getting stored in the string s_ Please help. I am using Visual studio 2005 with boost v1.34

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program options
by Stefan Bradl 22 Aug '07

22 Aug '07

Hello, I am using boost::program_options and need to load custom config files. So I think I need to write a parser, right? But I did not find any tutorials or something like that where I can learn how to write and usea parser with program options. Can anybody help me out og this problem? Thx in advance

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