June 2007 - Boost-users - lists.preview.boost.org

Boost test thread safety
by Chris 23 Jun '07

23 Jun '07

I have been working for a while on trying to diagnose whether my library or the boost test library is causing many of my thread issues. I hear that the boost test is not thread safe, is the correct? How incomplete is the thread safety and is there a time span on when it will be achieved? -Thanks for the current thread Chris

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Boost.Test internal framework error: unknown reason
by Ole Christian Weidner 23 Jun '07

23 Jun '07

Aloha, I have a strange problem when running the Boost Unit Test Framework on MacOS X (Intel). I'm using Boost 1.33.1 built from source with gcc 4.0.1 (Apple Computer, Inc. build 5367). Compiling and linking of my tests works fine with: /usr/bin/g++-4.0 -arch i386 -Wl,-all_load -L$BOOST_LOCATION - lboost_unit_test_framework ... but whenever I try to run my test application I get a not very meaningful error message (the same code works fine on Linux and Windows): [Session started at 2007-06-11 13:06:27 -0500.] SAGA C++ Conformance Tests Boost.Test internal framework error: unknown reason saga_test_suite_v2 has exited with status 200. The error seems to occur somewhere within the framework initialization - the entry point (test_suite * init_unit_test_suite (int argc, char* argv[])) is never reached. Any ideas how to track down the error? Are there any command line arguments to make the framework's output more verbose? Thanks, Ole

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[1.34.1] Release Candidate
by Thomas Witt 23 Jun '07

23 Jun '07

Hi, The 1.34.1 release candidate is now available from http://www.boost.org/release/ please give it a try and report any problems to the developer list or directly to me. I'll be travelling till July 5th. Internet access is unlikely, so far :( Thanks Thomas -- Thomas Witt witt(a)acm.org

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problem... maybe boost could help
by Lukasz 22 Jun '07

22 Jun '07

Hello, I'm fairly new to boost and don't know all of the functionality. I have been using the serialization library, read about mpl, signals and that's about it. Maybe someone will have an idea if there is anything in boost that i could use to solve the following problem (or any other solution). I'm working a an Agent framework, and at this point, specifically on an event (messaging system). The basic layout is the following (what concerns the messaging part): The framework contains Agents and Behaviors. They all need to communicate with each other. Both of these classes derive from an interface EventReceiver, which declares, amongst other things, a pure virtual ProcessEvent(Event * event) function. Specific behaviors and agents are obviously derived from the base ones. All events are derived from the base Event class (to allow users to create their own events with whatever information they need in there). The main messaging hub is a class MessengerService, which contains two maps, the first one relates static UUID's of events to UUID's of receivers , and the second receiver UUID's with a list of actual events of type Event*. The basic use case is: a behavior calls a register function in MessengerService to add itself as a receiver for a certain type of event (register/unregister can happen at anytime). At anytime, a behavior/agent can create an event, and call a send function, which adds it to the list of events that are pending for a given receiver (if a receiver was registered for this event type). As all agents/behaviors are ticked, a "Monitor" is moved to the current agent/behavior. The monitor queries the messenger service for all pending events destined for the current agent/behavior, and calls a processEvent function on the agent/behavior passing it the event as an argument. The problem is here. I want agents/behaviors to add handlers for different event types that they registered for, i.e. class SomeBehavior: public Behavior { ... processEvent(EventTest1 & event); processEvent(EventTest2 & event); ... } Since the events were registered, i know that the correct handlers exist in the most derived class types (there will also be a forwarding scheme for unregistered or broadcast events). The problem is that i only have a pointer to the base class (EventReceiver) and to the base class of the event (Event). I can't cast directly because i don't know the type to cast to. Also, i don't want to add virtual functions for all possible events to the base class, because that would mean that users would have to play around in the base class (framework) every time they add a new event. Lastly, i wanted to avoid having a general processEvent(Event & event) function and then have the users "switch" on the event type. I solved part of the problem (the first half) by adding a "MostDerviedHelper", which looks sort of like this: template<class Derived> class MostDerivedHelper { .... void dispatchEvent(Event * event) { // Do dispatching here m_derivedPointer->processEvent(*(event->This())); } private: Derived * m_derivedPointer; } Each derived type has a helper, which obviously contains the correct most derived type (since it's itself). The problem now, is that i don't know what to cast the event to so that it calls the correct handler. I can't add the same type of helper to event, because then i would have to pass it the receiver derived type through a template, but since it would have to be a template, i can't call it using my base class event pointer (can't create templated virtual functions). I tried adding a virtual function called "This()" to all events, which would return the derived classes' this pointer, but eventhough it's the correct type, i still need to cast it (which i can't) since it has to be resolved at compile time. I read quite a few things about double/multiple dispatch (in Loki for example), but it's not quite the solution i'm looking for because a usual implementation uses a callback, and that would require that i make my handlers static. MPL is not much of a help either because it's based on static polymorphism, and what i actually need is dynamic. I thought of using boost function & boost bind combined with a double dispatch scheme, but this doesn't work either because then i can't serialize it (i could re-perform the binding after a restore, which i already do for boost::signals, but it's a hassle). So, i'm pretty much out of ideas. I think to sum it up, what i would sort of need is: template<class ReceiverType, class EventType> class Dispatcher { ... send(ReceiverType * receiver, eventType * event) { receiver->processEvent(event); } } In this situation, i would already have all the correct types. The problem is that i can't get all this info at the same time. I also thought about using the curiously recurring template pattern as such: template<class Derived> class Event { template<class derivedReceiver> dispatch(derivedReceiver, Derived event) { .... } } This would work, except that since all events now must specialize to some type of base, i can't use a base class pointer to store in my map, i.e. i can't store all of my events in a map. If anyone has some brilliant idea as to how this can be done (if it can), then i would appreciate the input. Thanks, Lukasz -- View this message in context: http://www.nabble.com/problem...-maybe-boost-could-help-tf3959613.html#a112… Sent from the Boost - Users mailing list archive at Nabble.com.

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[wave] preprocessing error
by Ovanes Markarian 22 Jun '07

22 Jun '07

Hello Hartmut, I have a question to you. I got a header file with an error. The content of a file looks like: #ifndef SOME_GUARD #define SOME_GUARD ... some content #endif SOME_GUARD As you see #endif SOME_GUARD is wrong, standard defines that #endif is followed by a newline. Unfortunately wave threw an exception. Calling what member on the std::exception instance caught resulted in the string: boost::wave::preprocess_exception I spent some time to search where that happened and which line was guilty. Is there any way for you to write the file and line which caused the error? I assume smth bad happens inside the wave lib, since I even can not compare curren and end iterator tokens. With Kind Regards, Ovanes Markarian

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ASIO: multiple threads, single io_service
by Andrej van der Zee 22 Jun '07

22 Jun '07

Hi, I have some (beginners) question about the example server3-porgram that ships with the library. It uses multiple threads with a single io_service. In the method server::run() this happens: std::vector<boost::shared_ptr<boost::thread> > threads; for (std::size_t i = 0; i < thread_pool_size_; ++i) { boost::shared_ptr<boost::thread> thread(new boost::thread(boost::bind(&boost::asio::io_service::run, &io_service_))); threads.push_back(thread); } for (std::size_t i = 0; i < threads.size(); ++i) threads[i]->join(); But when are the threads actually scheduled? Does this happen by the shared io_service? Are the registered callback methods for async_read, async_accept, etc executed in the threads? Also, are there any tradeoffs that I should know off for using the single io_service vs io_service-per-thread approach? Thank you, Andrej ___________________________________________________________ Yahoo! Mail is the world's favourite email. Don't settle for less, sign up for your free account today http://uk.rd.yahoo.com/evt=44106/*http://uk.docs.yahoo.com/mail/winter07.ht…

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[ptr_container] How to transfer ownership from smart_ptr to ptr_container
by Seweryn Habdank-Wojewódzki 22 Jun '07

22 Jun '07

Hi! Is there any smart_ptr and ptr_container that can transfer ownership of pointer, to avoid useless copy-construction and destruction of the object. More less scenario can be like that. 1. smart pointer handles pointer to the huge data. 2. pointer is transfered via signal to the object that has queue of them. 2a. remark not all object are going to the queue, so there is a need to keep them in smart pointer. 3. Queue sends away pointer, or internally destroys (respectively to demand of another signal in the program. More less the simplified draft is shown below. Maybe I have to use vector <shared_ptr <T> > instead of ptr_container? Best regards. #include <boost/ptr_container/ptr_vector.hpp> #include <boost/shared_ptr.hpp> #include <iostream> class Foo { public: Foo (int const i) : i_ (i), j_() { ++counter; ++crcounter; std::cout << "Foo (int)" << '\t'; print_counter(); } Foo (Foo const & f) : i_ (f.i_), j_() { ++counter; ++crcounter; std::cout << "Foo (Foo)" << '\t'; print_counter(); } ~Foo() { --counter; std::cout << "~Foo () " << '\t'; print_counter(); } void print (std::ostream & os) const { os << i_; } static int counter; static int crcounter; static void print_counter() { std::cout << "No. Foo = " << counter << " No. created = " << crcounter << '\n'; } private: int i_; int j_[10000]; }; int Foo::counter = 0; int Foo::crcounter = 0; std::ostream & operator<< (std::ostream & os, Foo const & f) { f.print (os); return os; } int main() { using namespace boost; using std::cout; ptr_vector<Foo> pvf; Foo * pf = new Foo(7); cout << *pf << '\n'; pvf.push_back (pf); pf = new Foo(9); cout << *pf << '\n'; pvf.push_back (pf); shared_ptr<Foo> spf (new Foo(11)); cout << *spf << '\n'; pvf.push_back (new Foo (*spf)); spf = shared_ptr <Foo> (new Foo(13)); cout << *spf << '\n'; pvf.push_back (new Foo (*spf)); cout << pvf[0] << '\n'; cout << pvf[1] << '\n'; cout << pvf[2] << '\n'; cout << pvf[3] << '\n'; pf = new Foo(pvf[0]); pvf.erase(pvf.begin()); cout << *pf << '\n'; spf = shared_ptr <Foo> (new Foo (pvf[2])); cout << *spf << '\n'; delete pf; } -- |\/\/| Seweryn Habdank-Wojewódzki \/\/

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(no subject)
by david bautista garcia 22 Jun '07

22 Jun '07

hello: I don't understand this code, anybody can explain to me what does ":" and "" typedef boost::tokenizer<boost::char_separator<char> > tokenizer; boost::char_separator<char> sep(":", "", boost::keep_empty_tokens); tokenizer tokens(str, sep); tokenizer::iterator tok_iter = tokens.begin(); //cout << "TOKEN " << (*tok_iter) << endl; if de input is : TGTBTS:NAME=TGTBTS:42,BSIC=4-6,BCCHFREQ=784,SYSID=DCS1800,MSTXPMAXGSM=<NULL>,MSTXPMAXDCS=0,MSTXPMAXPCS=<NULL>,CELLGLID="214"-"03"-6004-1519; TGTPTPPKF:NAME=TGTBTS:42/TGTPTPPKF:0,RACODE=137,RACOL=0,GRXLAMI=6,GMSTXPMAC=15; what's de output? thanks -------------------------------------------------------------------------------------------- ¿Ya sabes con quién vas? ¿Héroe o Villano? Prepárate para la batalla final en http://friki.ozu.es -------------------------------------------------------------------------------------------- Correo enviado desde http://www.ozu.es

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Need help understanding boost::operators::dividable
by Scott, Steven 22 Jun '07

22 Jun '07

I'm sure the answer to this is out there somewhere, but I'm having trouble finding it. (wearing flame-retardant clothes...) I want to use boost::operators::field_operators to generate all the mathematical operators to allow Vector/scalar arithmetic. Everything works fine except for dividing scalars by vectors. Class Vector looks like this: class Vector : public std::vector<double>, boost::field_operators<Vector, boost::field_operators<Vector, double> > { // required operator+=, -=, *=, /= defined here. }; Now if I write: double x(3.0); Vector v(5), w; v[0] = 1; v[1] = 2; v[2] = 3; v[3] = 4; v[4]=5; w = 3+v; // works fine w = v+3; // works fine ... // subtract and multiply work on both sides w = v/x; // works fine w = x/v; // fails... I think the failure happens because of the way operator/ defined for mixed types something like this: T operator/(U u,T t) { T ans(u); ans/=t; return ans; } which is not what I need. Is there a way I can change the way operator/(double,Vector) works in this one case, but keep the really convenient definitions generated by field_operators otherwise? The information contained in this e-mail is confidential and/or proprietary to Capital One and/or its affiliates. The information transmitted herewith is intended only for use by the individual or entity to which it is addressed. If the reader of this message is not the intended recipient, you are hereby notified that any review, retransmission, dissemination, distribution, copying or other use of, or taking of any action in reliance upon this information is strictly prohibited. If you have received this communication in error, please contact the sender and delete the material from your computer.

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Fwd: [OT] [metaprogramming] Importance of order of delarations/definitions.
by Seweryn Habdank-Wojewódzki 22 Jun '07

22 Jun '07

Hi! Could anyone tell me if there is any example where in e.g. metaprogramming there is a need of strict order of declarations and definitions of templates? Theoretically there should not be a problem, but maybe there are some tricks where order influence on fitting types and/or for lookup of specializations. Generally the question is related to the fact, that GCC force user to put typedefs and declaration/definitions in proper order before any usage of types. And I am looking for the example which points why we can NOT mix all - when the order is important. Regards. -- |\/\/| Seweryn Habdank-Wojewódzki \/\/

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building boost with only one set of libraries
by frederic.bron＠alcan.com 22 Jun '07

22 Jun '07

I have spent so much time to find how to build boost with only one combination of release/debug, multithreading, static/shared... that I want to record the method in the archive for other potential users. By default boost is build 16 times which corresponds to all combinations of: - release/debug - multithreading on/off - static/shared link - runtime static/shared link It takes ages to compile and we get roughly 1 giga-bytes of data. In general you need only one combination of these options but it is not very well documented how to set these options. Here is a simple mean: unix like environnement: $ configure --prefix=path_to_the_intallation_directory edit Makefile: BJAM_CONFIG=link=static threading=multi runtime-link=shared --layout=system LIBS=release $ make install nocygwin environnement (build cygwin independant library from cygwin, can be used in CodeBlocks or with g++ -no-cygwin): build bjam from cygwin (boost-jam-3.1.14.tgz): $ chmod 755 build.bat; ./build.bat gcc-nocygwin build boost: $ full_installation_path_of_bjam/bjam link=static threading=multi runtime-link=shared --toolset=gcc-nocygwin --prefix="windows_path_to_the_intallation_directory" --layout=system release install F. Bron Avis : Ce message et toute pièce jointe sont la propriété d'Alcan et sont destinés seulement aux personnes ou à l'entité à qui le message est adressé. Si vous avez reçu ce message par erreur, veuillez le détruire et en aviser l'expéditeur par courriel. Si vous n'êtes pas le destinataire du message, vous n'êtes pas autorisé à utiliser, à copier ou à divulguer le contenu du message ou ses pièces jointes en tout ou en partie. Notice: This message and any attachments are the property of Alcan and are intended solely for the named recipients or entity to whom this message is addressed. If you have received this message in error please inform the sender via e-mail and destroy the message. If you are not the intended recipient you are not allowed to use, copy or disclose the contents or attachments in whole or in part.

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[signals] How to connect method with more arguments (pointers) to signal
by Seweryn Habdank-Wojewódzki 21 Jun '07

21 Jun '07

Hi How to connect method with more arguments (pointers) to signal using e.g. boost::bind? The code below works, but if I eliminate Data_type class from desing, and try to work directly on _two_ pointers I have a problem with connection methods to signal slots. Could anyone tell me how to do that? Best regards. #include <boost/bind.hpp> #include <boost/signals.hpp> #include <iostream> #include <utility> // some class class Test { public: explicit Test(int x) : x_ (x) {} int const x() const { return x_; } operator int() { return x_; } private: int x_; }; // class wrap references class Data_type { public: Data_type(double & d, Test & t) : d_ (d), t_ (t) {} double & d() const { return d_; } Test & t() const { return t_; } private: double & d_; Test & t_; }; // class react on signals class some_class { public: bool some_function(Data_type & dt) { bool test = (dt.d() > 3.14); std::cout << std::boolalpha << "Check " << dt.d() << " > 3.14 " << test << " and " << dt.t().x() << '\n'; return test; } bool another_function(Data_type & dt) { bool test = (dt.d() > 3.14); std::cout << std::boolalpha << "Check " << dt.d() << " > 3.14 " << test << " and " << dt.t().x() << '\n'; return test; } }; // signal source class Caller { public: Caller() : sig0(), sig1() {} ~Caller(){} typedef boost::signal <bool (Data_type & dt)> signal_type; typedef signal_type::slot_type slot_type; signal_type sig0; signal_type sig1; void emit (double & d, Test & t) { // conversion from 2 parameters to 1 Data_type tmp (d, t); sig0 (tmp); sig1 (tmp); } boost::signals::connection connect_to_sig0 (slot_type const & s) { return sig0.connect (s); } boost::signals::connection connect_to_sig1 (slot_type const & s) { return sig1.connect (s); } }; int main() { using std::cout; using namespace boost; some_class sc; Caller c; // if I will eliminate Data_type class // and change methods that they could take 2 arguments // then bind can not meet requirements of slot_type c.connect_to_sig0 (bind (&some_class::some_function, &sc, _1)); c.connect_to_sig1 (bind (&some_class::another_function, &sc, _1)); Test * t = new Test (4); double * d = new double (3.14); c.emit (*d, *t); } -- |\/\/| Seweryn Habdank-Wojewódzki \/\/

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Compile failure with fairly simple use of multi-index / hashing on Solaris with CC 5.8 (boost 1.34.0)
by Benson Margulies 21 Jun '07

21 Jun '07

I've a relatively basic example of using the multi-index capability that fails to compile on Studio 11 (CC 5.8) on Sparc. I submitted it to the tracker before spotting the injunction to talk to the mailing list first. Can anyone offer any relief here?

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pool allocator size 0
by Sebastian Pfützner 21 Jun '07

21 Jun '07

Hello, the following program crashes in the last line (deallocate) with VC8: #include "boost/pool/pool_alloc.hpp" int main() { boost::pool_allocator<int> a; int* i = a.allocate(0); a.deallocate(i, 0); } I didn't find any annotations about restrictions regarding the allowed size, neither in the c++ standard nor in the boost docs. I thought, calling allocate is the same as calling array new with 0 (gives back a pointer != 0 which must be array deleted). Is the boost pool allocator not fully standard compliant? -- Sebastian Pfützner s.pfuetzner(a)onlinehome.de ICQ-ID: 39965036

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'Explanation' of boostrapping problem
by Benson Margulies 21 Jun '07

21 Jun '07

There is internal dissention as to whether the toolset name is 'sun' or 'sunpro'. Bjam wants 'sun'. regression.py and the configure script want 'sunpro', and the configure script leaves 'sunpro' in user-config.jam with the unpleasant consequences I reported.

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Trying to follow standard library bootstrap instructions on Solaris 10 with CC 5.8
by Benson Margulies 21 Jun '07

21 Jun '07

sunblade% ./configure --with-toolset=sunpro --prefix=/sunblade1/boostinstall --without-icu -n Building Boost.Jam with toolset sunpro... tools/jam/src/bin.solaris/bjam -n Detecting Python version... 2.4 -n Detecting Python root... /usr/local -n Unicode/ICU support for Boost.Regex?... disabled. Generating Boost.Build configuration in user-config.jam... Generating Makefile... sunblade% make ./tools/jam/src/bin.solaris/bjam --user-config=user-config.jam sunpro.jam: No such file or directory /sunblade1/benson/boost/boost_1_34_0/tools/build/v2/build/toolset.jam:27 : in toolset.using rule sunpro.init unknown in module toolset. /sunblade1/benson/boost/boost_1_34_0/tools/build/v2/build/project.jam:82 5: in using user-config.jam:5: in modules.load /sunblade1/benson/boost/boost_1_34_0/tools/build/v2/build-system.jam:138 : in load /sunblade1/benson/boost/boost_1_34_0/tools/build/v2/kernel/modules.jam:2 61: in import /sunblade1/benson/boost/boost_1_34_0/tools/build/v2/kernel/bootstrap.jam :132: in boost-build /sunblade1/benson/boost/boost_1_34_0/boost-build.jam:9: in module scope Not all Boost libraries built properly.

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boost::thread flush()?
by Graham Reitz 20 Jun '07

20 Jun '07

Is there a method to release all threads waiting on a mutex? Or, more generally, a portable way to release a bunch of threads at the same time? (boost::asio?) I didn't see anything in the docs, besides barrier. Unfortunately, I can't guarantee the N threads will be waiting when a flush is needed. thanks, graham

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Examples for multi-indexing look rather different from doc
by Benson Margulies 20 Jun '07

20 Jun '07

The current doc for the multi-index feature uses the member<> parameterized type as the key extractor. The example source codes use some CPP macro all in caps that doesn't seem to be defined any longer. Perhaps the doc needs an update?

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[program_options] Reloading options
by Ovanes Markarian 20 Jun '07

20 Jun '07

Hello! Is there any way to reload (overwrite) config options. My scenario would be: Specifying an unlimited number of config-files. Process instructions of a config file. After the tool is done, load next config file (by overwriting previous settings). Would this work? With Kind Regards, Ovanes Markarian

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[Date Time] time duration Debug assertion VSC++ 8
by michael mathews 20 Jun '07

20 Jun '07

Hi All, This little program works with Visual Studio 2003 but fails with an assertion failure in VS 2005 sp1. #include "boost/date_time/posix_time/posix_time.hpp" int main() { using namespace boost::posix_time; time_duration timeinterval(24,0,0,0); return 0; } The assertion is from strftime.c line 659 ((timeptr->tm_hour>=0)&&(timeptr->tm_hour<=23)) Is there a fix? I am using boost 1.34.0 thanks in advance michael ____________________________________________________________________________________ Luggage? GPS? Comic books? Check out fitting gifts for grads at Yahoo! Search http://search.yahoo.com/search?fr=oni_on_mail&p=graduation+gifts&cs=bz

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ambiguous overload using boost::variant
by Paul.VanHagen＠shell.com 20 Jun '07

20 Jun '07

Hello, I'm having difficulty compiling the following code fragment using the Intel 9.1 C++ compiler. This little program mimics part of our application and the way we make use of the boost::variant class template. The build log follows at the end. The program itself is totally meaningless, but it just demonstrates a problem in either the compiler or in boost. The strange thing is that this program compiles nicely without any problem using the gcc 3.3.1 compiler on Linux. I appreciate any help. TIA Paul #include <map> #include <string> #include <boost/variant.hpp> using namespace std; template <typename IntT=int> class A { public: A() : m_i(0) { } A(const IntT& i) : m_i(i) { } private: IntT m_i; }; template <typename StringT, typename IntT=int> class B { public: B() : m_pi(0) { } B(const string& s, const IntT& i) : m_pi(new IntT(i)) { } ~B() { delete m_pi; } private: StringT m_s; IntT* m_pi; }; typedef A<> a_t; typedef B<string> b_t; typedef boost::variant<a_t, boost::recursive_wrapper<b_t> > Integer; typedef Integer* IntegerPtr; template <typename CharT, typename IntT, typename DoubleT> class numeric_type : public boost::variant<CharT, IntT*, DoubleT> { public: typedef boost::variant<CharT, IntT*, DoubleT> numeric_type_variant; /// Default constructor. numeric_type() : numeric_type_variant() { } numeric_type(const CharT& ch) : numeric_type_variant(ch) { } numeric_type(IntT* pInt) : numeric_type_variant(pInt) { } numeric_type(const DoubleT& d) : numeric_type_variant(d) { } /* template <typename T> /// Converting constructor. numeric_type(T const& t) : numeric_type_variant(t) { } */ // some more code }; int main(int argc, char* argv[]) { char ba; double bc; // set up map with variant integers map<string, Integer> mapInteger; mapInteger.insert(make_pair("a", a_t(0))); mapInteger.insert(make_pair("b", b_t("b", 1))); numeric_type<char, Integer, double> b(ba); numeric_type<char, Integer, double> c(&mapInteger["b"]); numeric_type<char, Integer, double> d(bc); return 0; } ------ Build started: Project: VariantProblemDemo, Configuration: Debug Win32 ------ Compiling... VariantProblemDemo.cpp C:\Mijn Documenten\Backup\Projects\Work\3rdParty\boost\boost\variant\variant.hpp(1273) : error C2668: 'boost::detail::variant::make_initializer_node::apply<BaseIndexPair,Iterator>::initializer_node::initialize' : ambiguous call to overloaded function with [ BaseIndexPair=boost::mpl::aux::iter_fold_impl<2,boost::mpl::begin<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::end<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::pair<boost::detail::variant::initializer_root,boost::mpl::int_<0>>,boost::mpl::lambda<boost::mpl::protect<boost::detail::variant::make_initializer_node>>::type>::state1, Iterator=boost::mpl::aux::iter_fold_impl<2,boost::mpl::begin<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::end<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::pair<boost::detail::variant::initializer_root,boost::mpl::int_<0>>,boost::mpl::lambda<boost::mpl::protect<boost::detail::variant::make_initializer_node>>::type>::iter1 ] C:\Mijn Documenten\Backup\Projects\Work\3rdParty\boost\boost\variant\detail\initializer.hpp(89): could be 'int boost::detail::variant::make_initializer_node::apply<BaseIndexPair,Iterator>::initializer_node::initialize(void *,boost::detail::variant::make_initializer_node::apply<BaseIndexPair,Iterator>::initializer_node::param_T)' with [ BaseIndexPair=boost::mpl::aux::iter_fold_impl<2,boost::mpl::begin<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::end<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::pair<boost::detail::variant::initializer_root,boost::mpl::int_<0>>,boost::mpl::lambda<boost::mpl::protect<boost::detail::variant::make_initializer_node>>::type>::state1, Iterator=boost::mpl::aux::iter_fold_impl<2,boost::mpl::begin<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::end<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::pair<boost::detail::variant::initializer_root,boost::mpl::int_<0>>,boost::mpl::lambda<boost::mpl::protect<boost::detail::variant::make_initializer_node>>::type>::iter1 ] C:\Mijn Documenten\Backup\Projects\Work\3rdParty\boost\boost\variant\detail\initializer.hpp(89): or 'int boost::detail::variant::make_initializer_node::apply<BaseIndexPair,Iterator>::initializer_node::initialize(void *,boost::detail::variant::make_initializer_node::apply<BaseIndexPair,Iterator>::initializer_node::param_T)' with [ BaseIndexPair=boost::mpl::aux::iter_fold_impl<2,boost::mpl::begin<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::end<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::pair<boost::detail::variant::initializer_root,boost::mpl::int_<0>>,boost::mpl::lambda<boost::mpl::protect<boost::detail::variant::make_initializer_node>>::type>::state0, Iterator=boost::mpl::aux::iter_fold_impl<2,boost::mpl::begin<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::end<boost::variant<a_t,boost::recursive_wrapper<b_t>>::recursive_enabled_types>::type,boost::mpl::pair<boost::detail::variant::initializer_root,boost::mpl::int_<0>>,boost::mpl::lambda<boost::mpl::protect<boost::detail::variant::make_initializer_node>>::type>::iter0 ] while trying to match the argument list '(void *, const int)' C:\Mijn Documenten\Backup\Projects\Work\3rdParty\boost\boost\variant\variant.hpp(1342) : see reference to function template instantiation 'void boost::variant<T0_,T1>::convert_construct<const T>(const T &,int,boost::mpl::false_)' being compiled with [ T0_=a_t, T1=boost::recursive_wrapper<b_t>, T=int ] VariantProblemDemo.cpp(62) : see reference to function template instantiation 'boost::variant<T0_,T1>::variant<int>(const T &)' being compiled with [ T0_=a_t, T1=boost::recursive_wrapper<b_t>, T=int ] VariantProblemDemo - 1 error(s), 0 warning(s) ---------------------- Done ---------------------- Build: 0 succeeded, 1 failed, 0 skipped

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Porting to vc8
by Rupali.Praveen＠barclayscapital.com 20 Jun '07

20 Jun '07

Hi I have inherited some code that uses the boost1300\boost\numeric\ublas , specifically the matrix constructs. We are now porting our code from vc6 to vc8. The current library seems to be giving a lot of compilation errors, like: ../../ThirdParty\boost1300\boost\numeric\ublas\matrix_expression.hpp(781 ) : error C2027: use of undefined type 'boost::numeric::ublas::vector_matrix_binary<E1,E2,F>::const_iterator2' ../../ThirdParty\boost1300\boost\numeric\ublas\matrix_expression.hpp(603 ) : see declaration of 'boost::numeric::ublas::vector_matrix_binary<E1,E2,F>::const_iterator2' ../../ThirdParty\boost1300\boost\numeric\ublas\matrix_expression.hpp(700 ) : see reference to class template instantiation 'boost::numeric::ublas::vector_matrix_binary<E1,E2,F>::const_iterator1' being compiled ../../ThirdParty\boost1300\boost\numeric\ublas\matrix_expression.hpp(103 4) : see reference to class template instantiation 'boost::numeric::ublas::vector_matrix_binary<E1,E2,F>' being compiled Do I need to download the latest version of boost for the porting? Thanks Rupali ------------------------------------------------------------------------ For important statutory and regulatory disclosures and more information about Barclays Capital, please visit our web site at http://www.barcap.com. Internet communications are not secure and therefore the Barclays Group does not accept legal responsibility for the contents of this message. Although the Barclays Group operates anti-virus programmes, it does not accept responsibility for any damage whatsoever that is caused by viruses being passed. Any views or opinions presented are solely those of the author and do not necessarily represent those of the Barclays Group. Replies to this email may be monitored by the Barclays Group for operational or business reasons. Barclays Capital is the investment banking division of Barclays Bank PLC, a company registered in England (number 1026167) with its registered office at 1 Churchill Place, London, E14 5HP. This email may relate to or be sent from other members of the Barclays Group. ------------------------------------------------------------------------

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[bind] overloaded function troubles
by Michael Marcin 19 Jun '07

19 Jun '07

I have a windows compiler that is a derivative of cw 9.4 that is complaining when trying to compile the following #include <boost/bind.hpp> struct a { void foo(int) {} void foo() {} }; void bar() { boost::bind( &a::foo, _1 ); } the actual error is: ### mwccsym2.exe Compiler: # In: C:\Subversion\boost-RC_1_34_0\boost\boost\bind.hpp # From: bind_test.cpp # ---------------------- # 1633: ::bind_t< result_type, F, list_type >( F( f ), list_type( a1 ) ); # Error: ^ # illegal implicit conversion from 'boost::_bi::bind_t<const void (&)(void *const , const void *const , void *const , const void *const , int), boost::_mfi::dm<void (const void *const , int), a>, boost::_bi::list1<boost::arg<1>>>' to # 'boost::_bi::bind_t<const void (&)(const void *const , int), boost::_mfi::dm<void (const void *const , int), a>, boost::_bi::list1<boost::arg<1>>>' # (point of instantiation: 'bar()') # (instantiating: 'boost::bind<boost::arg<1>, void (const void *const , int), a>(void (a::*)(int), boost::arg<1>)') Changing the definition to struct a { void foo() {} void foo(int) {} }; lets it compile but this is not a general solution as this fails to compile: void bar() { boost::bind( &a::foo, _1, 0 ); } I've uploaded a full minimal example to my website including the compiler in question if it helps. http://www.mikemarcin.com/misc/mwccsym/bind_overload.zip Thanks, Michael Marcin

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New bcbboost release
by Nicola Musatti 19 Jun '07

19 Jun '07

Hallo, I just released a new version of bcbboost, the unofficial BCB Boost patches. This is a set of patches that improves Boost's support of Borland/CodeGear compilers. The current version supports Boost 1.34.0 and bcc32 5.9.0, the new compiler that is part of C++Builder 2007. For more information and download: http://bcbboost.sourceforge.net Comments and bug reports, not to mention code contributions, are all very welcome. Please use the SourceForge trackers or the mailing list, bcbboost-general(a)lists.sourceforge.net Enjoy! Nicola Musatti

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Re: [Boost-users] math/statistics policy-interface feedback requested.
by John Maddock 19 Jun '07

19 Jun '07

Hubert Holin wrote: > The proposed interface is certainly nice and could definitely be > worked with. OK good. > For the global choices it is perfectly adequate, IMO. For finer > control however, it does appear very fine-grained (per-function), > which, in addition to making error message harder to read, is perhaps > not the most frequent level of interaction needed. For instance, > while I certainly see the need sometimes for per-function disabling > of internal double promotion, I believe that more frequently users > may want to set these preferences at the translation unit level, when > not at the global level. Whilst I think you're correct that per-TU control is the most often needed requirement: it's actually the hardest of all to provide without violating the dreaded "one definition rule". The only solution I can think of involves making the special function macros - which also means we can't overload them - and then internally mangling the function names according to the policies in effect (in other words the same as the current proposal). Perhaps more interesting, and based on the current proposal is per-namespace policies: #include <boost/math/special_functions.hpp> typedef something my_policy_type; namespace mynamespace{ BOOST_MATH_DECL_POLICY_SPECIAL_FUNCTIONS(my_policy_type); } Then "mynamespace::tgamma(x);" would use my_policy_type to determine it's behaviour. If you an unnamed namespace then this could be used in place of a using declaration, to bring a specific set of functions into the scope of the current TU only. > While (mostly) global objects may be evil, something along the > lines of standard streams and their interaction with locales and > facets may perhaps be easier to deal with. For instance, functions > may requests their choices from some external "policy object", which > may be locally altered, much as streams will enquire from a locale > how to typeset dates. Granted, this would make multithreading all the > hairier (which is not really a good idea). Oh, no global objects please, they're evil, no really they are! :-) > On the other hand, not all > functions necessarily require information about every configuration > choice possible, so passing in all the info when only some is needed > may perhaps be excessive. That's true. However, I now have the meta-programming code that allows a function to reset policies that it knows aren't relevent to it to their defaults. Policy objects also get "normalised" internally to reduce code bloat, so: tgamma(x, policy1); and tgamma(x, policy2); are one-line inline forwarders that will call the same template instantiations internally, if there are no relevent differences between policy1 and policy2. Thanks for the feedback, John.

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