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complex matrix operations
by sairamesh raghuraman 02 Sep '11

02 Sep '11

Hello, I am looking for a C++ library that has routines for a variety of complex matrix decompositions (eigen, cholesky, singular value etc) and even complex matrix inverse, principal matrix logarthm of a complex matrix etc. And the matrices which I am talking are pretty huge..can go upto 1024 x 1024 x 32. I have already found a library that can do all of the above..used it..it works fine..but a disadvantage is that it cannot handle multidimensional arrays. Now the question is, does Boost C++ library have functions for the above? Looking forward to a reply and thanks in advance Ramesh

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[Program Options] notifiers for options with no value
by Dmitriy Matison 01 Sep '11

01 Sep '11

Hello, I'm wondering if there is a possibility to make program_options library to notify me automatically when option with no value is passed? As far as I understand this feature exists only for options with defined value_semantic. But this means I must permit passing a value for such options. Say, I make an option with zero_tokens() semantics so it can be passed without value and throw an error if some value was provided. Unfortunately, this doesn't solve the problem if you have positional options. In that case a positional option following a no-value option will be parsed as this option's value. I can't set notifier for options with no value? This is something not understandable. I even think of some patch to be added to the lib. Regards, Dmitriy.

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problem deserializing to base class pointer
by Shipa 01 Sep '11

01 Sep '11

I have a strange problem. I searched through the list and modified my initial code quite a bit but cannot seem to get this to work. Serialization seems fine, but deserialization to base pointer in particular doesn't seem to work correctly (I am getting instance of base class inside). The example below is canonical version of a much more complex case I was working with, involving shared_ptr and template classes, but it boiled down (for now) to this: A.h ---------------------------------------------------- #pragma once #include "boost/serialization/serialization.hpp" #include "boost/shared_ptr.hpp" class A { public: int t; A():t(0){}; //friend std::ostream& operator<<(std::ostream& os, const A& a); virtual ~A(){ }; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & t; } }; std::ostream& operator<<(std::ostream& os, const A& a) { return os << "A: t = " << a.t << std::endl; } typedef boost::shared_ptr<A> APtr; ---------------------------------------------------- B.h ---------------------------------------------------- #pragma once #include "boost/serialization/serialization.hpp" #include "boost/shared_ptr.hpp" class B: public A { public: int m; B():A(),m(0){}; ~B(){}; //friend std::ostream& operator<<(std::ostream& os, const B& b); friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & boost::serialization::base_object<A>(*this); ar & m; } }; std::ostream& operator<<(std::ostream& os, const B& b) { return os << "B: t = "<< b.t << "; m = "<< b.m << std::endl; } typedef boost::shared_ptr<B> BPtr; ---------------------------------------------------------------- Test.cpp ---------------------------------------------------------------- #include "stdafx.h" #include "boost/shared_ptr.hpp" #include "boost/serialization/shared_ptr.hpp" #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/export.hpp> #include <istream> #include <ostream> #include <fstream> #include "A.h" #include "B.h" BOOST_CLASS_EXPORT(A) BOOST_CLASS_EXPORT(B) boost::archive::text_iarchive* GetiArchiveAndRegister(std::ifstream& f) { boost::archive::text_iarchive* ar= new boost::archive::text_iarchive(f); // ar->register_type(static_cast<A *>(NULL)); // ar->register_type(static_cast<B *>(NULL)); return ar; } boost::archive::text_oarchive* GetoArchiveAndRegister(std::ofstream& f) { boost::archive::text_oarchive* ar=new boost::archive::text_oarchive(f); // ar->register_type(static_cast<A*>(NULL)); // ar->register_type(static_cast<B*>(NULL)); return ar; } int _tmain(int argc, _TCHAR* argv[]) { A* a=new A(); a->t=1; B* b=new B(); b->t=2; b->m=1; A* c=new B(); c->t=2; std::ofstream f1("c:\\a"); boost::archive::text_oarchive* oa1=GetoArchiveAndRegister(f1); *oa1 & a; f1.close(); std::ofstream f2("c:\\b"); boost::archive::text_oarchive* oa2=GetoArchiveAndRegister(f2); *oa2 & b; f2.close(); std::ofstream f3("c:\\c"); boost::archive::text_oarchive* oa3=GetoArchiveAndRegister(f3); *oa3 & c; f3.close(); //deserializes fine std::ifstream f4("c:\\a"); boost::archive::text_iarchive* oa4=GetiArchiveAndRegister(f4); *oa4 & a; f4.close(); //deserializes an instance of A std::ifstream f5("c:\\b"); boost::archive::text_iarchive* oa5=GetiArchiveAndRegister(f5); *oa5 & a; f5.close(); //deserializes fine std::ifstream f6("c:\\c"); boost::archive::text_iarchive* oa6=GetiArchiveAndRegister(f6); *oa6 & a; f6.close(); //deserializes fine std::ifstream f7("c:\\b"); boost::archive::text_iarchive* oa7=GetiArchiveAndRegister(f7); *oa7 & b; f7.close(); std::ifstream f8("c:\\c"); boost::archive::text_iarchive* oa8=GetiArchiveAndRegister(f8); //runtime error: vector subscript out of range on the next line *oa8 & b; f8.close(); return 0; } ------------------------------------------------------------------ deserializations of f5 and f8 are controversial. I tried exchanging BOOST_CLASS_EXPORT calls with register_type call (commented out in GetiArchiveAndRegister and GetoArchiveAndRegister), and when that is done both serialization and deserialization finish correctly. I tried changing the order of includes, moving BOOST_CLASS_EXPORT around, etc. This version is what I'm settled for as the correct one. What am I doing wrong? Can anybody help?

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Re: [Boost-users] [Threads] How to keep number of running thread constant, performing different operations
by Alessandro Candini 01 Sep '11

01 Sep '11

I've tryed implementing your suggestions with the following code: #include <iostream> #include </usr/local/include/boost/asio.hpp> #include </usr/local/include/boost/thread/thread.hpp> #include </usr/local/include/boost/bind.hpp> #include </usr/local/include/boost/date_time/posix_time/posix_time.hpp> #include </usr/local/include/boost/scoped_ptr.hpp> void handler1() { unsigned short int i; std::cout << "O--> Handler 1 <--O" << std::endl; for(i=0; i<65000; i++); std::cout << "X--> Handler 1 <--X" << std::endl; } void handler2() { unsigned short int i; std::cout << "O--> Handler 2 <--O" << std::endl; for(i=0; i<1000; i++); std::cout << "X--> Handler 2 <--X" << std::endl; } int main() { unsigned short nProc, i; boost::asio::io_service io; boost::scoped_ptr<boost::asio::io_service::work> work(new boost::asio::io_service::work(io)); boost::thread_group tg; nProc = boost::thread::hardware_concurrency(); for(i=0; i<nProc; ++i) tg.create_thread(boost::bind(&boost::asio::io_service::run, boost::ref(io))); io.post(handler2); io.post(handler1); io.post(handler2); io.post(handler2); io.post(handler2); io.post(handler2); io.post(handler2); io.post(handler2); io.post(handler2); io.post(handler1); io.post(handler2); work.reset(); tg.join_all(); return 0; } It seems to work, but it is correct, in your opinion? The only problem is that it seems to never stop if I increase the value of i in handler1 up to 70000. Have you any other suggestions? -- Alessandro Candini MEEO S.r.l. Via Saragat 9 I-44122 Ferrara, Italy Tel: +39 0532 1861501 Fax: +39 0532 1861637 http://www.meeo.it ======================================== "ATTENZIONE:le informazioni contenute in questo messaggio sono da considerarsi confidenziali ed il loro utilizzo è riservato unicamente al destinatario sopra indicato. Chi dovesse ricevere questo messaggio per errore è tenuto ad informare il mittente ed a rimuoverlo definitivamente da ogni supporto elettronico o cartaceo." "WARNING:This message contains confidential and/or proprietary information which may be subject to privilege or immunity and which is intended for use of its addressee only. Should you receive this message in error, you are kindly requested to inform the sender and to definitively remove it from any paper or electronic format."

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[test] Organizing C++ Unit Test code for maximum Unit Test efficiency?
by Martin B. 01 Sep '11

01 Sep '11

Hi! Recently asked a questing on SE http://programmers.stackexchange.com/questions/105012/how-should-c-unit-tes… that boils down to How can C++ Unit Test code be effectively organized, so that it's both efficient to edit the (test) code and to run the test code? I figured this might be of interest to Boot.Test users. cheers, Martin

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[bind] deduce arguments types
by Martin Häfner 01 Sep '11

01 Sep '11

Hi all, I have written a small grammar for command line parsing where function binders could be added as actors (callback) of a distinct option. The simple example below shows that the free function id(...) is called if the option -i is getting parsed and the bound member function is called when -j is given: bool id(int i) { return true; /* if id satisfies some preconditions, the parser will evaluate the result value */ } struct Id { void id(int i) { // the parser will not evaluate the 'void' result value } }; Id ident; bool rc = cmdline::Parser<SomePolicyA, SomePolicyB, SomePolicyC> ::parse(argc, argv, cmdline::Option<'i'>().doc("an integer identifier")) >> id <= cmdline::Option<'j'>().doc("another integer")) >> boost:bind(Id::id, &ident, _1) ); The problem now is that I want to deduce the result type of the given actor as well as the argument type. Retrieving the result type is manageable with boost binders but I have no idea how I could retrieve the argument type in order to do a proper conversion from char* to int without the usage of make_adaptable<> which breaks the elegance of the binder usage at this point. My self-written binder class exposes appropriate typedefs so the writer of the parser grammar does not have to cope with all that 'magic' template stuff, but I cannot get a working solution for boost::bind nor do I get a working solution with tr1 binders. Maybe anybody could help or at least could explain me why the boost classes do not define these simple typedefs? Regards, Martin

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[serialization] deserializing asynchronously serialized types
by Andrew Hundt 01 Sep '11

01 Sep '11

I have an unusual use case for boost.serialization, and I was wondering if it would be possible to adapt it to my needs: - I have a set of over 100 types, and instances of each are generated asynchronously then serialized to a file in that order. - The most interesting serialized data will be written just before the power is unexpectedly cut. - I need to load in and run on as much data as possible when reading the serialized data back, ignoring incomplete data at the end (due to a power cut). - The basic Boost serialization examples require you to know the type of the next piece of data to be loaded when reading. Since these types are generated asynchronously they are not known in advance. - I need to write the data out immediately when it arrives because of the power issue. - Files will be getting up to around 150GB in size for binary archives, so it can't be marshaled in memory, it needs to be written immediately even if it is redundant. Is there a way to read in that serialized file using the facilities provided in boost.serialization? I could also serialize an index or custom headers indicating the next type to appear, I would prefer to avoid doing so. One way of achieving some of these goals is writing one piece at a time using a binary archive to an fstream. But I don't know what aspects of my requirements will prove to be a problem. Thanks for your thoughts. Cheers! Andrew Hundt

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[asio] sync operations with timeout
by Gennady Proskurin 31 Aug '11

31 Aug '11

Hello. I write network library which offers blocking socket operations (connect, read, write, ...) with timeouts, using boost::asio asynchronous operations as implementation. It is actually some sort of wrapper around boost::asio. Implementation does something like this (read, for example): do_read() { timer.async_wait(&handle_timer) socket.async_read(..., handle_read); wait_for_all_handlers(); deal_with_ec(); } handle_timer() { socket.cancel(); } handle_read() { timer.cancel(); } I have one io_service for all the sockets/timers with one thread doing io_service::run(). Code is multithreaded, so many threads run that functions like do_read() simultaneously (for different sockets, of course). I have two questions: 1. How to wait for completion of all handlers? Currently I use shared_ptr with mutex+condvar (for each library call), it works fine, but seems to be too heavy-weight. 2. There is a chance (with small timeouts), that timer expires before async_read() is started, so sock.cancel() is no-op in handle_timer(), and timer will be disabled. Currently, I just ignore this. I can use another mutex (or strand) to protect from this, but it is also heavy-weight.

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Re: [Boost-users] Reg : Boost Error - any.hpp
by Vijay 31 Aug '11

31 Aug '11

Hi, Below is the snippet code, class Fcif; class FcifNode { public: FcifNode (const string& val): value (val) {}; FcifNode (const Fcif& fcif): value (fcif) {}; FcifNode (const FcifNode& node): value (node.value) {}; FcifNode& operator= (const string& val) { value = val; return *this; }; FcifNode& operator= (const Fcif& val) { value = val; return *this; }; FcifNode& operator= (const FcifNode& val) { value = val.value; return *this; }; bool isValue () const { return (value.type () == typeid (string)); }; bool isFcif () const; type_info const& type () const { return value.type (); }; string& getValue () const; Fcif& getFcif () const; string toString () const; protected: any value; }; class Fcif: public map<string,FcifNode> { public: Fcif () { }; Fcif (const Fcif& fcif): map<string,FcifNode> (fcif) { }; Fcif (const string& fcifString); string getValue (string const& name, bool required = true) const; bool checkValue (string const& name, string& value) const; bool setValue (string const& name, string const& value, bool escapeIt = true); void setValue (Fcif const& fcif); bool removeNode (string const& name, type_info const& type = typeid (void)); bool removeValue (string const& name) { return removeNode (name, typeid (string)); }; bool removeAggregate (string const& name) { return removeNode (name, typeid (Fcif)); }; bool setAggregate (string const& name, Fcif const& fcif); Fcif* getAggregate (string const& name) const { // auto-append '|' to name as needed return const_cast<Fcif*>(this)->addAggregate ( name + ((name.empty () || name[name.size()-1] == '|') ? "" : "|") , false); }; string toString () const; void parseFcif (string const& fcifString); private: Fcif* addAggregate (string const& name, bool create = true); Fcif parsePreFcif (string::const_iterator begin_pos, string::const_iterator& end_pos); string extractTag (string const& name) const { string::size_type tagpos = name.find_last_of ('|'); return name.substr (tagpos == string::npos ? 0 : tagpos + 1); }; string extractAgg (string const& name) const { string::size_type tagpos = name.find_last_of ('|'); return name.substr (0, tagpos == string::npos ? 0 : tagpos); }; }; Regards, Vijay Can you please post at least a self-consisting code snippet which allows to reproduce it... Otherwise I doubt someone will help you with this... Best Regards, Ovanes On Sun, Aug 28, 2011 at 7:57 AM, Vijay <v2k.sweet_at_[hidden]> wrote: > > > > Hi, > > We are using boost version 1.31.0 in our C++ code. Our OS is HP-UX 11.31 > Itanium. We use aCC compiler. While compiling my code, I'm getting the below > error. Can any one help me to fix this issue ? > > "/opt/app/q1app2c4/boost-1.31.0/boost/any.hpp", line 125: error #2070: > incomplete type is not allowed > ValueType held; > ^ > detected during: > instantiation of class > "boost::any::holder<ValueType> [with ValueType=Fcif]" > at > line 32 > instantiation of "boost::any::any(const ValueType &) [with > ValueType=Fcif]" at line 35 of > "/opt/app/q1app2c4/src/share/incl/Fcif.h" > > > > > Cheers, > Vijay....(V2K) > E-mail to : v2k.sweet_at_[hidden] > Catch me @ 9962003328, 7871181610 > Blackberry PIN : 259943F3 > "Life is just one grand sweet song, so start the music."

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Compiling version 1.43 of boost/graph with SunCC 5.8
by Renaud Kauffmann 30 Aug '11

30 Aug '11

#include <boost/graph/adjacency_list.hpp> using namespace boost; typedef adjacency_list <vecS, vecS, undirectedS> BoostGraph; typedef graph_traits < BoostGraph >::vertex_descriptor vertex_t; int main() { BoostGraph g; vertex_t v1 = add_vertex(g); vertex_t v2 = add_vertex(g); vertex_t v3 = add_vertex(g); return 0; } The above code doesn't seem to compile with Sun Studio 11, that is Sun C++ compiler 5.8 and boost 1.43 Here is the error: "/home/renaudk/boost/boost_1_43_0/boost/unordered/detail/table.hpp", line 38: Error: Could not find a match for boost::unordered_detail::hash_table<boost::unordered_detail::T>::find_iterator<boost::unordered_detail::hash_table<boost::unordered_detail::T>::Key, boost::unordered_detail::hash_table<boost::unordered_detail::T>::Pred>(bucket_ptr, const boost::unordered_detail::Key&, const boost::unordered_detail::Pred&) const. "/home/renaudk/boost/boost_1_43_0/boost/unordered/detail/table.hpp", line 38: Error: Too many args in template, from boost::unordered_detail::Pred on ignored. "/home/renaudk/boost/boost_1_43_0/boost/unordered/detail/table.hpp", line 595: Error: Could not find a match for boost::unordered_detail::hash_table<boost::unordered_detail::T>::find(const boost::unordered_detail::Key&, const boost::unordered_detail::Hash&, const boost::unordered_detail::Pred&) const. "/home/renaudk/boost/boost_1_43_0/boost/unordered/detail/table.hpp", line 595: Error: Too many args in template, from boost::unordered_detail::Hash on ignored. 4 Error(s) detected. I have tried some of the switch I found in the forums such as -library=stlport4 -features=tmplife -features=tmplrefstatic But no luck. Does anybody know the trick ? Thanks.

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