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complexity of boost::num_vertices boost::num_edges
by Heiko Bauke 12 Aug '07

12 Aug '07

Hi, I wonder what is the time complexity of boost::num_vertices and boost::num_edges? Are these constant time operations? I could not find an answer to this question in BGL documentation. Regards, Heiko -- -- Never ascribe to malice, that which can -- be explained by incompetence. (Napoleon) -- Cluster Computing @ http://www.clustercomputing.de -- Heiko Bauke @ http://www.physics.ox.ac.uk/users/bauke

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Re: [Boost-users] cross compiling boost for ARM
by Hughes, James 12 Aug '07

12 Aug '07

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of remi > Sent: 05 January 2007 14:44 > To: boost-users(a)lists.boost.org > Subject: [Boost-users] cross compiling boost for ARM > > > hi! > > I want to cross compile boost for an ARM processor. > For a pxa 270. but when i try to cross compile boost with > arm-linux-g++ , it dosen't work ... a proble with jam... > > everyone can help me? > > Thank you > > BEST REGARDS > > Rémi bjam "-sGCC_ROOT_DIRECTORY=/opt/montavista/mobilinux/devkit/arm/iwmmxt_le" "-sGCC=iwmmxt_le-gcc" "-sGXX=iwmmxt_le-g++" <location for libs> Obviously you would need to change the location namd names of the compile tools to whatever you are using. James This message (including any attachments) contains confidential and/or proprietary information intended only for the addressee. Any unauthorized disclosure, copying, distribution or reliance on the contents of this information is strictly prohibited and may constitute a violation of law. If you are not the intended recipient, please notify the sender immediately by responding to this e-mail, and delete the message from your system. If you have any questions about this e-mail please notify the sender immediately.

3 3

shared_ptr, pimpl, reference semantics, and const correctness
by Braddock Gaskill 11 Aug '07

11 Aug '07

I am continuing work on a futures library for boost. future objects (as currently considered by the C++ standards committee, in particular Peter Dimov's proposal) have reference semantics, like many pimpl types. I have some burning questions about const correctness. Hypothetical reference-semantic example: future f1; future f2 = f1; //f2 refers to the same underlying object as f1 f2.set(42); //do something assert(f1.get() == 42); // see, same underlying object This is roughly equivalent to: boost::shared_ptr<future_impl> f1; boost::shared_ptr<future_impl> f2 = f1; A std::vector<T>::iterator is an example of another type with reference semantics. So, say I have a simple future class: class future_impl { public: bool get() const {return value_;} void set(bool value) {value_ = value;} private: bool value_; }; class future { //not really a future, just example public: future() : impl_(new future_impl) {} future(const future &other) : impl_(other.impl_) {} bool get() const {return impl_->get();} // Set may not be const, but it does NOT really modify this class void set(bool value) {impl_->set(value);} private: boost::shared_ptr<future_impl> impl_; }; I have made the future::set() method non-const, but it does NOT really modify the underlying future class, only the future_impl class it refers to. This makes life very difficult when it comes to passing futures by reference: // alternative #1 - pass const future & void f1(const future &f) { bool v = f.get(); // no problem, get() is const f.set(!v); // cannot do this, set() is not const // BUT I can bypass the const-ness trivially, so it is pointless future f2(f); f2.set(!v); } // alternative #2 - pass future & // with #2, I can't do simple things like this: // f2(future(f)); //ERROR: non-const reference from a temporary - irritating void f2(future &f) { bool v = f.get(); // no problem, get() is const f.set(!v); } // alternative #3 - pass by value // Constructing shared_ptr's is VERY inefficient void f3(future f) { bool v = f.get(); // no problem, get() is const f.set(!v); // cannot do this, set() is not const } // alternative #4 - const_future base class with the subset of const methods? // kinda like a const_iterator? seems klunky. class const_future {bool get() const;}; class future : public const_future {void set(bool);} Does anyone have any advice or ideas? Oh, and then there is a possible need for something like a weak_ptr<future_impl>, like a weak_future class? And then a const_weak_future? I don't want to think about it... Thanks, Braddock Gaskill

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Installer for Boost 1.34.1
by Rusty Jones 11 Aug '07

11 Aug '07

Hi, Does anyone know if boost consulting is going to provide an installer for 1.34.1 and if so what time frame? Cheers, Rusty

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BOOST libraries still not part of BOOST dist
by dhruva 11 Aug '07

11 Aug '07

Hi, I am wondering if there is a list of all BOOST libraries which are under under review or accepted for future inclusions. Is "VAULT" the right place to look for such libraries? A list with a short writeup would be very useful. I know the interprocess and asio library existance and hence can google around to find their download locations. There may be many other libraries (I stumbled upon Channel and join) which is not listed in the BOOST site (in a comprehensive, single page manner). -dky -- Dhruva Krishnamurthy Contents reflect my personal views only!

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Serialization of infinite float
by Arnstein Ressem 11 Aug '07

11 Aug '07

Hi, I have run into a problem with the boost xml serialization of overflowing floats. On Linux these are being serialized as 'inf' into the xml files, but when reading the float back in it results in stream errors. I have searched the archives to find an answer to this, but without luck. The small program below has been compiled and run on 32-bit and 64-bit Linux (RedHat Enterprise Linux 4) with boost 1.33.1 and 1.34.1. In every case it results in a stream error and the float can not be read back in from the xml file. Does anyone know if this is supposed to work ? #include <fstream> #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> int main() { const char fname[] = "float.xml"; float f = 1.0e+20*1.0e+20; { std::ofstream ofs(fname); assert(ofs.good()); boost::archive::xml_oarchive oa(ofs); oa << BOOST_SERIALIZATION_NVP(f); } { std::ifstream ifs(fname); assert(ifs.good()); boost::archive::xml_iarchive ia(ifs); ia >> BOOST_SERIALIZATION_NVP(f); } return 0; } Best regards, Arnstein Ressem

4 3

Boost Math Toolkit: Compare simulation data
by NFarnsworth＠web.de 11 Aug '07

11 Aug '07

Hallo, I want to use the test function from the boost math toolkit library to compare simulation results of mechantronic systems with a reference solution. The test reads the reference solution from a file, and after the simulation the test compares the file data with the data from a double array. But if a value of a function is close to zero, I will get a gross relative error. Do you have any suggestion to solve this problem? Thanks for your help in advance Best regards Niklas _______________________________________________________________________ Jetzt neu! Schützen Sie Ihren PC mit McAfee und WEB.DE. 3 Monate kostenlos testen. http://www.pc-sicherheit.web.de/startseite/?mc=022220

2 1

What happened to boost::thread priority?
by Graham Reitz 10 Aug '07

10 Aug '07

I was looking through the list archives and its looks like the a feature to set the thread priority fizzled out around 2003ish. Did this get tabled? This is really a curiosity question. Thanks, Graham

1 0

[boost.python] can not export a union in VC2005sp1
by qiaozhiqiang＠datangmobile.cn 10 Aug '07

10 Aug '07

// Visual V++ 2005(8.0) sp1, boost 1.34.0 // union not is_class. // because there is BOOST_STATIC_ASSERT(is_class<T>::value) in make_instance_impl // can not export union. eg, class_<union my_u> // can not return_internal_reference<> when T not is_class, eg, return char*, char&, union u& // how to write return_internal_pointer: char* get(); // how to return_value_policy<return_by_value> work: char* get() // def_readwrite(union): default get() return by value ? // is_class<T> ? T& : T get() ?? // delete BOOST_STATIC_ASSERT(is_class<T>::value); of make_instance_impl, then compile OK, and work not all OK boost/python/object/make_instance.hpp template <class T, class Holder, class Derived> struct make_instance_impl { typedef objects::instance<Holder> instance_t; template <class Arg> static inline PyObject* execute(Arg& x) { // must is_class ?? to BOOST_STATIC_ASSERT(is_class<T>::value || is_union<T>::value)?? BOOST_STATIC_ASSERT(is_class<T>::value); /////////////////////////////// #include <boost/python.hpp> using namespace boost::python; union my_u { int a; char b; char& get_ref() { return b; } char* get_ptr() { return *b; } } struct my_s { my_u u; my_u& get_ref() { return u; } my_u* get_ptr() { return &u; } }; void my_module() { //1. compile ERROR: my_u not is_class, my_u is_union, I modify one line in make_instance.hpp // BOOST_STATIC_ASSERT(is_class<T>::value) to //BOOST_STATIC_ASSERT(is_class<T>::value || is_union<T>::value) // and the def_readwrite a, b work OK. // and work OK, why not export an union? class_<my_u > u_class("my_u", init< >()); u_class.def_readwrite("a", &my_u::a); u_class.def_readwrite("b", &my_u::b); //2. compile ERROR: char not is_class, delete BOOST_STATIC_ASSERT(is_class<T>::value), but run error u_class.def("get_ref", &my_u::get_ref, return_internal_reference< >()); //3. compile ERROR: char not is_class, delete BOOST_STATIC_ASSERT(is_class<T>::value), but run error, how to return_internal_reference a char? Use def_readwrite？ u_class.def("get_ptr", &my_u::get_ptr, return_internal_reference< >()); //4. compile OK, but run ERROR, I need it return a char .def("get_value", &my_u::get_ptr, return_value_policy<return_by_value>()); //5. compile ERROR, char* is not a reference, I need but have no copy_non_const_pointer, how to write copy_non_const_pointer? u_class.def("get_copy", &my_u::get_ptr, return_value_policy<copy_non_const_reference>()); class_<my_s > s_class("my_s", init< >()); //6. compile OK, buy run ERROR: // s = my_s() // s.u.a = 100 // print s.u.a // but output s.u.a != 100 !!! // s.u.a = 100 is s.get_u().set_a(100) and get_u() not return u(is_union) by ref ? s_class.def_readwrite("u", &my_s::u); // 7. compile ERROR: my_u not is_class, is_union, modify BOOST_STATIC_ASSERT(is_class<T>::value) to // BOOST_STATIC_ASSERT(is_class<T>::value || is_union<T>::value) s_class.def("get_ptr", &my_s::get_ptr, return_internal_reference<>()); s_class.def("get_ref", &my_s::get_ref, return_value_policy<return_by_value>());//compile ok } Best 　Regards ! Qiao Zhi Qiang

2 1

Process for adding code to boost
by Hughes, James 10 Aug '07

10 Aug '07

Hello all, I was interested in knowing how to go about presenting new code for addition to boost. I'm not talking about a new library, but extensions to existing ones. For example, I have written some code to allow serialisation of the boost::filesystem::path class (not particularly exciting or complicated, but may be useful to someone), and would like to pass it on. James This message (including any attachments) contains confidential and/or proprietary information intended only for the addressee. Any unauthorized disclosure, copying, distribution or reliance on the contents of this information is strictly prohibited and may constitute a violation of law. If you are not the intended recipient, please notify the sender immediately by responding to this e-mail, and delete the message from your system. If you have any questions about this e-mail please notify the sender immediately.

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unique sorted vector
by Michael Marcin 10 Aug '07

10 Aug '07

I have a need for a low memory set. Essentially I want an always sorted unique vector. Is such a wrapper around vector and/or deque available in Boost? Thanks, Michael Marcin

1 0

Avoid thread locking with boost::condition
by Sam Lievesley 10 Aug '07

10 Aug '07

Hi, I am trying to avoid thread locking problems when waiting using a boost::condition pseudo code: Main thread -- Start a worker thread -- boost::mutex::scoped_lock lock(m_Mutex); m_Condition.notify_one(); Worker thread boost::mutex::scoped_lock lock(m_Mutex); while (IsAlive()) { // do some work m_Condition.wait(lock); } As we can't predict which thread gets the mutex lock first lets assume that its the main thread. If this happens then m_Condition.wait will wait indefinitely as notify was called before wait. The only reliable way (that I can see) to prevent this is to never use wait, use a timed_wait instead and a loop. Why isn't the notification signal queued in the boost::condition object? Then the order of wait / notification would not be important. thanks Sam

2 1

Visual Studio 2005 ptr_list visualizer?
by Michael Marcin 10 Aug '07

10 Aug '07

Hello I've seen Visual Studio 2005 visualizers for various boost containers on here before. Has anyone written one for ptr_list that they can share? Thanks, Michael Marcin

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Problem with boost::bind and boost::lambda::bind
by Stefano Peluchetti 10 Aug '07

10 Aug '07

I'm a newbie to the boost library so I need some help with the following problem: Take the following code: class EaSde // Abstract class. { ... public: inline virtual double unitDiffusionInverseMap( double x ) const = 0; inline virtual void unitDiffusionInverseMap( Path& path ) const; .... }; void EaSde::unitDiffusionInverseMap( Path& path ) const { std::transform( path.values.begin(), path.values.end(), path.values.begin(), boost::bind<double>( &sde::EaSde::unitDiffusionInverseMap, this, _1 ) ); } This code works fine. However if I use boost::bind::lambda instead of boost::bind I get: 1>Compiling... 1>sdefunctionalmc.cpp 1>c:\develop\nsde\nsde\abstracteasde.hpp(58) : error C2664: 'const boost::lambda::lambda_functor<T> boost::lambda::bind<double,const sde::EaSde*,const boost::lambda::placeholder1_type>(const Arg1 &,const Arg2 &,const Arg3 &)' : cannot convert parameter 1 from 'overloaded-function' to 'const double &' 1> with 1> [ 1> T=boost::lambda::lambda_functor_base<boost::lambda::action<3,boost::lambda::function_action<3>>,boost::tuples::tuple<const double,const sde::EaSde *const ,const boost::lambda::lambda_functor<boost::lambda::placeholder<1>>,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type,boost::lambda::detail::bind_traits<boost::tuples::null_type>::type>>, 1> Arg1=double, 1> Arg2=const sde::EaSde *, 1> Arg3=const boost::lambda::placeholder1_type 1> ] 1> Reason: cannot convert from 'overloaded-function' to 'const double' 1> Context does not allow for disambiguation of overloaded function 1>c:\develop\nsde\nsde\abstracteasde.hpp(58) : error C2780: '_OutIt std::transform(_InIt1,_InIt1,_InIt2,_OutIt,_Fn2)' : expects 5 arguments - 4 provided 1> c:\programmi\microsoft visual studio 8\vc\include\algorithm(797) : see declaration of 'std::transform' Why in this case is boost::bind working and boost::lambda::bind not working? Where can I find more informations on the differences about the two? On a side note I'm wondering if I can expect different performance of the two implementations.... I'm actually moving everything to boost::lambda::bind to 1) avoid the conflict of boost::lambda::_1 and _1 2) have binders that are "lambda ready" if needed Thank you in advance for your reply.

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Using lambda for sort
by Olaf van der Spek 10 Aug '07

10 Aug '07

Hi, I'm trying to sort a map based on second, but I get all kinds of compiler errors and I have no idea what's wrong. A simple _1 > _2 works fine, but that compares the maps themselves. Also, is there a better way to write the copy from map to vector or to sort the map in general? Note that I'm using a map because I'm counting how often an integer or string occurs. #include <boost/lambda/lambda.hpp> #include <boost/lambda/bind.hpp> #include <algorithm> #include <map> #include <vector> using namespace std; using namespace boost::lambda; int _tmain(int argc, _TCHAR* argv[]) { typedef std::map<int, int> countries_t; countries_t countries; countries[0] = 5; countries[1] = 3; countries[2] = 1; typedef vector<countries_t::const_iterator> countries1_t; countries1_t countries1; for (countries_t::const_iterator i = countries.begin(); i != countries.end(); i++) countries1.push_back(i); sort(countries1.begin(), countries1.end(), _1->second > _2->second); return 0; } ------ Build started: Project: Lambda Test, Configuration: Debug Win32 ------ Compiling... Lambda Test.cpp c:\vc\temp\lambda test\lambda test.cpp(23) : error C2819: type 'boost::lambda::lambda_functor<T>' does not have an overloaded member 'operator ->' with [ T=boost::lambda::placeholder<1> ] did you intend to use '.' instead? c:\vc\temp\lambda test\lambda test.cpp(23) : error C2039: 'second' : is not a member of 'boost::lambda::lambda_functor<T>' with [ T=boost::lambda::placeholder<1> ] c:\vc\temp\lambda test\lambda test.cpp(23) : error C2819: type 'boost::lambda::lambda_functor<T>' does not have an overloaded member 'operator ->' with [ T=boost::lambda::placeholder<2> ] did you intend to use '.' instead? c:\vc\temp\lambda test\lambda test.cpp(23) : error C2039: 'second' : is not a member of 'boost::lambda::lambda_functor<T>' with [ T=boost::lambda::placeholder<2> ] c:\vc\temp\lambda test\lambda test.cpp(23) : error C2780: 'void std::sort(_RanIt,_RanIt)' : expects 2 arguments - 3 provided c:\program files\microsoft visual studio 8\vc\include\algorithm(3109) : see declaration of 'std::sort' Lambda Test - 5 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

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boost::variant/visitor problem
by Joe 10 Aug '07

10 Aug '07

Hi, Can someone help me. I have defined a boost::variant<long long,double,std::string> with a visitor which issues an increment. The visitor derived class below works fine for std::string and long long only within the visitor, but as soon as I add a double, I get an ambiguous call compile error (error below). I'm guessing when T within the prop_increment class is an int, the compiler doesn't know whether to use the long long version of the operator() or the double version. Does anyone know how I can get around this when I apply the visitor? Interestingly enough, if I add an int to the boost::variant template list the error goes away. ------ Compile Error ------ Error 44 error C2668: 'boost::detail::variant::make_initializer_node::apply<BaseIndexPair,Iterator>::initializer_node::initialize' : ambiguous call to overloaded function \boost\variant\variant.hpp 1273 ----------------------------- ------ Visitor Class ----------- class prop_increment : public boost::static_visitor<> { public: template <typename T, typename U> void operator()( T &, const U & ) const { return; } template<typename T> void operator()(T & lhs, const T& rhs) const { lhs += rhs; } }; ------------------------------------ boost::apply_visitor(prop_increment(),prop1,prop2); ---- Visitor Call ------------------- Thanks

1 0

boost::iostreams::gzip_compressor and multiple files
by Robert Caldecott 10 Aug '07

10 Aug '07

I have been experimenting with the boost::iostreams to create a gzip file, for example the following works fine: using namespace boost::iostreams; filtering_ostream out; out.push(gzip_compressor()); out.push(file_sink("test.gz", std::ios::binary)); out << "This is a gz file\n"; This will create a gz file containing a single compressed file (called 'test'). I can change the name of this internal file using a gzip_params struct and all is well. However, I want to create a single gzip file that contains multiple compressed files, each with a different filename. Does anyone know how to achieve this? Thanks in advance.

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Re: [Boost-users] Serialization of hashmap
by Hansi Hansi 10 Aug '07

10 Aug '07

My system is using the dinkumware.hpp header as stdlib. There the BOOST_HAS_HASH is not set. But olso if I set this it doesn't work. Because it doesn't has the resize function and the bucket_count. Best regards Hansjörg > -----Ursprüngliche Nachricht----- > Von: boost-users(a)lists.boost.org > Gesendet: 10.08.07 08:25:39 > An: boost-users(a)lists.boost.org > Betreff: Re: [Boost-users] Serialization of hashmap > > Hansi Hansi wrote: > > > the BOOST_HAS_HASH makro wosn't set. > > OK - that macro should be set automatically by > including "config..hpp" > > I believe that I've had problem in the past in this > area. If you find out why it wasn't set, let us > know so we can fix it in the next release. > > Robert Ramaey > > > > > Best regards > > Hansjörg > > > > > > > > <hr> > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > _________________________________________________________________________ In 5 Schritten zur eigenen Homepage. Jetzt Domain sichern und gestalten! Nur 3,99 EUR/Monat! http://www.maildomain.web.de/?mc=021114

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boost static assert and is_base_of question.
by chun ping wang 10 Aug '07

10 Aug '07

Hi, how would I ensured that class U of template class is a dervied class of boost::operators<U> using BOOST_STATIC_ASSERT and boost::is_base_of... template <T> myFunc(const T& a) { typedef boost::operators<T> operatorT; BOOST_STATIC_ASSERT(is_integral<T>::value || is_base_of<operatorT, T>::value); // ... other codes. } doing this gives me an error. arguments, but takes just 1 ./cs512/c++/cppdef/DiffieHellman.cpp: In function `T boost::random_prime(boost:: function<bool ()(const T&, const T&), std::allocator<void> >, int)': ./cs512/c++/cppdef/DiffieHellman.cpp:23: error: `BOOST_STATIC_ASSERT' was not de clared in this scope ./cs512/c++/cppdef/DiffieHellman.cpp:49:78: macro "BOOST_STATIC_ASSERT" passed 2 arguments, but takes just 1 ./cs512/c++/cppdef/DiffieHellman.cpp: In function `boost::tuples::tuple<T, T, bo ost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boos t::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost: :tuples::null_type, boost::tuples::null_type> boost::dh_init(const boost::any&)' : ./cs512/c++/cppdef/DiffieHellman.cpp:49: error: `BOOST_STATIC_ASSERT' was not de clared in this scope ./cs512/c++/cppdef/DiffieHellman.cpp:64:78: macro "BOOST_STATIC_ASSERT" passed 2 arguments, but takes just 1 ./cs512/c++/cppdef/DiffieHellman.cpp: In function `T boost::dh_secret(const T&, const T&, const T&)': ./cs512/c++/cppdef/DiffieHellman.cpp:64: error: `BOOST_STATIC_ASSERT' was not de clared in this scope make[1]: *** [lib/DiffieHellman.o] Error 1 make[1]: Leaving directory `/c/CPW/cs_classes' make: *** [all-before] Error 2

2 1

Re: [Boost-users] Serialization of hashmap
by Hansi Hansi 10 Aug '07

10 Aug '07

> > > Hansi Hansi wrote: > > Hello, > > > > I don't know If I'm wrong. To install boost I have used the installer > > from boost-consulting. At the moment I'm using version 1.34.0. > > I have set the configuration makros in the follwing way > > > > #define BOOST_HAS_HASH > > #define BOOST_STD_EXTENSION_NAMESPACE stdext > > #define STD BOOST_STD_EXTENSION_NAMESPACE > > You shouldn't have to set any macros. These should be set by > boost/config.hpp which sets them properly for each compiler. > I don't know if these are in fact set. If not, > the fact that these tests are passing on my system and on the > release tests wouldn't mean much. > > I'm too busy right now to look further into it. > > Robert Ramey > > the BOOST_HAS_HASH makro wosn't set. Best regards Hansjörg > > > > The problem is that during compiling I get 2 errors: > > > > Error 133 error C2039: 'resize' : is not a member of > > 'stdext::hash_map<_Kty,_Ty,_Tr>' > > C:\boost_1_34_0\boost\serialization\hash_collections_load_imp.hpp 46 > > Error 134 error C2039: 'bucket_count' : is not a member of > > 'stdext::hash_map<_Kty,_Ty,_Tr>' > > C:\boost_1_34_0\boost\serialization\hash_collections_save_imp.hpp 43 > > > > The test program doesn't work to compile too. There are problems > > with the following lines: > > > > namespace BOOST_STD_EXTENSION_NAMESPACE { > > template<> > > struct hash<random_key>{ > > <<<<<<<<<------------- line 156 > > std::size_t operator()(const random_key& r) const { > > return (std::size_t)r; > > } > > }; > > } // namespace BOOST_STD_EXTENSION_NAMESPACE > > > > > > Error 9 error C2143: syntax error : missing ';' before '<' > > c:\boost_1_34_0\libs\serialization\test\test_map.cpp 156 > > > > Is there some other makro that I have to define? > > > > Best Regards and many thanks for your help > > > > Hansjörg > > > >> -----Ursprüngliche Nachricht----- > >> Von: boost-users(a)lists.boost.org > >> Gesendet: 09.08.07 08:54:35 > >> An: boost-users(a)lists.boost.org > >> Betreff: Re: [Boost-users] Serialization of hashmap > > > > > >> > >> There is a test program - test_map which should demonstrate the > >> functionality. > >> > >> It depends upon standard boost macros for stdext: so if the test > >> doesnt invoke the hash map, you might check to see if the config > >> system is correct. > >> > >> Let me know what you find out. > >> > >> Robert Ramey > >> > >> Hansi Hansi wrote: > >>> Hello, > >>> > >>> Sorry I have forgotten to write the subject in the last post. > >>> > >>> is there a possibility to serialize a hash_map with the vc8.0 > >>> compiler? this compiler has defined a hash_map under the stdext > >>> namespace. It seems that the implementation in boost doesn't work at > >>> the moment for this class. > >>> > >>> Or is there another hash_map implementation available which can be > >>> serialized? > >>> > >>> Best regards > >>> Hansjörg > >>> > >>> > >>> _____________________________________________________________________ > >>> Der WEB.DE SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu > >>> sparen! > >>> http://smartsurfer.web.de/?mc=100071&distributionid=000000000066 > >> > >> > >> > >> > >> > >> <hr> > >> _______________________________________________ > >> Boost-users mailing list > >> Boost-users(a)lists.boost.org > >> http://lists.boost.org/mailman/listinfo.cgi/boost-users > >> > > > > > > __________________________________________________________________________ > > Erweitern Sie FreeMail zu einem noch leistungsstärkeren > > E-Mail-Postfach! > > Mehr Infos unter http://produkte.web.de/club/?mc=021131 > > > > > > <hr> > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > _______________________________________________________________________ Jetzt neu! Schützen Sie Ihren PC mit McAfee und WEB.DE. 3 Monate kostenlos testen. http://www.pc-sicherheit.web.de/startseite/?mc=022220

2 1

[Serialization] Problem serialization of derived classes
by Andreas Willich 09 Aug '07

09 Aug '07

Hi there! I have a problem with the code in the attachment. I followed the documentation and the examples, but I did not get the code to work. Gcc produces a lot of failures that something is already instantiated in header files of the serialization library. Has someone a idea what I am doing wrong? My gcc version is 4.1.1-r3 and I am working on a gentoo x86 box. Andreas Willich

4 5

is asio's io_service required for any socket related call?
by pete＠mu.org 09 Aug '07

09 Aug '07

Hi, I 've been doinking around with asio for a few weeks, and I've run into an issue I can't seem to wrap my head around. I've been playing with some code that originally was meant to pound a server with a large amount of packets for benchmarking purposes. It uses threads to launch hundreds of threads per second. When I replaced the old socket code with asio, and used a single io_service with run being called within each thread, I run out of file descriptors very quickly, and if I use a single io_service within each thread it's the same thing but the performance seems worse. Needless to say, this seems like a real limitation and I'm hoping I'm just being limited by my own misunderstanding, because I'm really enjoying the portability of asio. The docs that are there seem great, but there seems to be a lot more the library can do that I am missing out on, and I think the docs seem like they are not mentioning a lot of what asio an do. Can someone point me in the right direction for launching 1-to-N threads with a single send_to and a single receive_from within each thread that doesn't take the hit I'm seeing? It seems to me, that it's obvious that the io-service design is the difference, because I don't get the issue at all when I use plain old sockets, and the OS thread limit is then the only limitation. Any help would be greatly appreciated. FYI, I've done most of my experimenting on Linux and OSX. Thanks, Pete

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boost.thread library and the thread is running
by Mirosław Makowiecki 09 Aug '07

09 Aug '07

Is it boost.thread library have a ability by next of its I is allowed to find out what it is running? How do it? Thanks in advice.

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Re: [Boost-users] [boost::fusion v2 and xpressive] versioning conflicts...
by Ovanes Markarian 09 Aug '07

09 Aug '07

Eric, many thanks for you help. I will try doing it until Monday. Some additional question: fusion v2 will be a separate lib, so the path boost/fusion instead of boost/spirit/fusion is fine? With Kind Regards, Ovanes Markarian On Thu, August 9, 2007 21:02, Eric Niebler wrote: > > Ovanes Markarian wrote: >> Hello, >> >> I am using fusion v2 in my project and first would like to thank for the great lib. I installed this lib into the boost/fusion directory. >> >> Today I started using xpressive lib (which is also a great one!!!). Unfortunately xpressive broke >> my compilation, because it includes things from boost/spirit/fusion and my code includes headers from boost/fusion. Now my assumption: AFAIK spirit/fusion contains version 1. Since I would like to use version 2 I can not simply copy it into the spirit directory, since it can break other things like wave. Is it correct? If yes, does anyone have suggestions on how I should deal with this issues? > > > I can infer from this that you're using boost 1.34.1 or earlier, and you've copied boost.fusion from svn HEAD into the tree, right? Xpressive isn't expecting to find Fusion v2 in Boost 1.34, hence the problem. You'll need to hack on xpressive a bit to make this work. In > xpressive_fwd.hpp, you should add something like > > #if BOOST_VERSION >= 103500 > #ifndef BOOST_XPRESSIVE_FUSION_V2 > #define BOOST_XPRESSIVE_FUSION_V2 > #endif > #endif > > Then everywhere xpressive conditionally includes fusion v1 or v2, you should check BOOST_XPRESSIVE_FUSION_V2 instead of the boost version. You'll need to do something similar in proto_fwd.hpp (#define > BOOST_PROTO_FUSION_V2) and all of proto's headers. Then you'll be ableto force the issue by compiling with BOOST_XPRESSIVE_FUSION_V2 and > BOOST_PROTO_FUSION_V2 defined. > > If you do all this and submit a patch, I'll accept it. > > > -- > Eric Niebler > Boost Consulting > www.boost-consulting.com > > The Astoria Seminar ==> http://www.astoriaseminar.com > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users > With Kind Regards, Ovanes Markarian

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Subject: [Serialization] Why is it not possible to serialize this structure through a pointer?
by Oliver Kania 09 Aug '07

09 Aug '07

Hello, I have the following struct: struct CUBE_INFO { friend class boost::serialization::access; long cube; std::string ncube; UINT number_dimensions; DIMENSION_LIST dimensions; long double number_cells; long double number_filled_cells; enum STATUS { UNLOADED = 0, LOADED, CHANGED } status; enum TYPE { NORMAL = 0, SYSTEM, ATTRIBUTE } type; friend std::istream& operator>>( std::istream& in, CUBE_INFO& cubeInfo ); friend std::ostream& operator<<( std::ostream& out, const CUBE_INFO& cubeInfo ); private: template<class Archive> void serialize( Archive &ar, const unsigned int version ) { ar & cube; ar & dimensions; ar & ncube; ar & number_cells; ar & number_dimensions; ar & number_filled_cells; ar & status; ar & type; } }; here, DIMENSION_LIST is an STL-vector of longs. I am including #include <boost/serialization/vector.hpp> #include <boost/serialization/access.hpp> I try to comple the code below (MS VisualStudio 8, boost 1.34) #include <fstream> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <string> #include "../Palo/Cache/AbstractCache.h" #include "../Palo/Cache/CubeCache.h" #include "../Palo/Cache/CubesCache.h" #include "../Palo/types.h" using namespace jedox::palo; int main(int argc, char* argv[]) { //string filename("SerializeTest"); CUBE_INFO* c = new CUBE_INFO(); std::ofstream ofs("filename"); //std::ofstream ofs("filename" ); // save data to archive { boost::archive::text_oarchive oa( ofs ); // write class instance to archive oa << ( c ); // archive and stream closed when destructors are called } return 0; } The resulting error message is: >f:\lib\x32\include\boost\archive\detail\oserializer.hpp(567) : error C2027: use of undefined type 'boost::STATIC_ASSERTION_FAILURE<x>' 1> with 1> [ 1> x=false 1> ] 1> f:\lib\x32\include\boost\archive\basic_text_oarchive.hpp(78) : see reference to function template instantiation 'void boost::archive::save<Archive,T>(Archive &,T &)' being compiled 1> with 1> [ 1> Archive=boost::archive::text_oarchive, 1> T=jedox::palo::CUBE_INFO * 1> ] regards, Oliver

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