February 2008 - Boost-users - lists.preview.boost.org

[xpressive] regex_search() question
by Robert Dailey 05 Feb '08

05 Feb '08

Hi, Currently I have the following string: "test anothertest somethinelse skillholder" I'm trying to create a regex that will match each word. For example, the following regex: (\w+) will match each word. However, boost::xpressive::regex_search() stops at the first substring match. I'm looking for a way to make it continue to find matches until the end of the string is met. So when I review the matches at the end of the search, it will have 4 matches, each match representing one word in the string above. The C++ code is below. Note that I only get "test" in my results back, when I expected 3 other words to be in the matches. Can anyone tell me how to make it continue the search beyond the first match? Thank you. std::string classes = "test anothertest somethinelse skillholder"; using namespace boost::xpressive; sregex rex = sregex::compile( "(\\w+)" ); smatch matches; regex_search( classes, matches, rex );

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put problem
by BomBielFil 05 Feb '08

05 Feb '08

Hi I'm new user of boost library I tried to create a graph but I can't modify the weight_map of this graph. In my code: boost::property_map<Triangultion,boost::edge_weight_t>::type weight_map=get(boost::edge_weight,ft); | | put(weight_map,*eit,100); at compile time I've for command "put": "../property_map.hpp:319: error: invalid lvalue in assignment Best regards -Bombielfil-

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Re: [Boost-users] using transform_iterator with std::lower_bound
by Alexis H. Rivera-Rios 05 Feb '08

05 Feb '08

Just so you know, the code compiles fine in VC2005 and Windriver Diab compiler. Gcc 3,4 is the one that complains. Can somebody explain me why that happens? Thanks, Alexis Programming Tutorial: In Python: To do this, do this In Perl: To do this, do this or this or this or this... In C: To do this, do this, but be careful In C++: To do this, do this, but don't do this, be careful of this, watch out for this, and whatever you do, don't do this ____________________________________________________________________________________ Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping

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using transform_iterator with std::lower_bound
by Alexis H. Rivera-Rios 05 Feb '08

05 Feb '08

Hi, I'm trying to use a transform iterator and lower_bound to search a list of integers as if it was list of booleans. According to the message the const_mem_fun_ref_t doesn't have a default constructor. Is there a way to make this code compile? Your help will be appreciated! Alex #include<functional> #include <vector> #include <algorithm> #include <boost/iterator/transform_iterator.hpp> class T { public: int _a; T(int a) : _a(a) {} bool greaterZero() const { return _a > 0; } }; int main(void) { typedef std::vector<T> Tlist; typedef std::const_mem_fun_ref_t<bool,T> Function; typedef boost::transform_iterator<Function, Tlist::const_iterator> Iterator; Tlist x; Iterator b(x.begin(),std::mem_fun_ref<bool,T>(&T::greaterZero)), e(x.end(),std::mem_fun_ref<bool,T>(&T::greaterZero)); std::lower_bound(b,e,false); } Error log: BD Software STL Message Decryptor v3.10 for gcc 2/3/4 matob.cpp:28:2: warning: no newline at end of file /cygdrive/c/opt/boost_1_34_1/boost/iterator/transform_iterator.hpp: In constructor `boost::transform_iterator< main()::Function, vector<T>::const_iterator, boost::use_default , boost::use_default >::transform_iterator()': stl_algo.h:2627: instantiated from `boost::transform_iterator< main()::Function, vector<T>::const_iterator, boost::use_default , boost::use_default > lower_bound( boost::transform_iterator< main()::Function, vector<T>::const_iterator, boost::use_default , boost::use_default >, boost::transform_iterator< main()::Function, vector<T>::const_iterator, boost::use_default , boost::use_default >, const bool & )' matob.cpp:26: instantiated from here /cygdrive/c/opt/boost_1_34_1/boost/iterator/transform_iterator.hpp:100: error: No match for `const_mem_fun_ref_t<bool, T>::const_mem_fun_ref_t()' stl_function.h:640: candidates are: const_mem_fun_ref_t<bool, T> ::const_mem_fun_ref_t(const const_mem_fun_ref_t<bool, T> &) stl_function.h:644: const_mem_fun_ref_t< bool, T>::const_mem_fun_ref_t(bool (T::*)() const) Programming Tutorial: In Python: To do this, do this In Perl: To do this, do this or this or this or this... In C: To do this, do this, but be careful In C++: To do this, do this, but don't do this, be careful of this, watch out for this, and whatever you do, don't do this ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs

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timer question...
by Raveendra Madala 05 Feb '08

05 Feb '08

Hi We can use the SetTimer/KillTimer APIs in windows to register a CALLBACK function to handle WM_TIMER messages at (approx) regular intervals of time (or handle WM_TIMER messages in WindowProc). Is there a portable equivalent in boost (thread) library? Boost::timer helps in measurement of time only!! Warm Regards Raveendra

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BoostCon - Call for Sessions
by Jeff Garland 05 Feb '08

05 Feb '08

The second annual Boost conference will take place in Aspen, Colorado, May 5-9. BoostCon is the main face-to-face event for all things Boost, from generic-programming techniques to Boost community, from using Boost libraries to writing Boost libraries, from deployment considerations to promoting the use of Boost more widely, from TR1 to TR2. Given the range and interests of last year's participants, the event again promises to be intense and in depth. We invite you to propose a session. See the BoostCon home page at www.boostcon.com for more information. Session formats Presentations focus on a practitioner’s ideas and experience with anything relevant to Boost and Boost users. Panels feature three or four people presenting their ideas and experiences relating to Boost's relevant, controversial, emerging, or unresolved issues. Panels may be conducted in several ways, such as comparative, analytic, or historic. Tutorials are formally prepared sessions at which instructors teach conference participants specific Boost-relevant skills. Workshops provide an active arena for advancements in Boost-relevant topics. Workshops provide the opportunity for experienced practitioners to develop new ideas about a topic of common interest and experience. Author's Corner Presentations focus on tips on usage and design. In addition, we're looking to uncover the hidden design gems hidden in boost libraries -- see below for more. Other formats may also be of interest. Don't hold back a proposal just because it doesn't fit into a pigeonhole. Session topics Topics of interest include, but are not restricted to, the following: * General tutorial sessions introducing one or more Boost libraries * In-depth sessions on using specific libraries * Case studies on using Boost * Experts panels * Advanced sessions on implementation techniques used within Boost libraries * TR1 (and TR2) * Development workshops to extend or enhance existing Boost libraries * Workshops on design process * Infrastructure workshops o Build tools o Website o Testing * C++0x and how it will change life for users and library writers * Concepts and Generic Programming * Other topics likely to be of great interest to Boost users and developers Interactive and collaborative sessions are encouraged, as this is the nature of both the online Boost community and the style of learning and participation that has proven most successful at such events. Sessions can be tutorial based, with an emphasis on interaction and participant involvement, or workshop based, whether hands-on programming or paper-based, discussion-driven collaborative work. Author's Corner Presentations Based on user feedback from last year, we'd like to encourage Boost library authors to do short sessions (typically 30 minutes) providing an overview of their libraries, tips on usage and design. In particular, we're looking to uncover the hidden design gems that underlie so many boost libraries. Standard outline for a presentation is as follows -- feel free to deviate as needed. * Library Purpose / Motivations * Library Genesis & History o why you developed it o when it was accepted o how it has evolved * Library Concepts * Library Usage Overviews and Tips * Library Design Decisions / Design Gems * Question / Answer Submitting a proposal Standard Sessions are 90 minutes. You may submit a proposal for fractions or multiples of 90-minutes. Fractional proposals will be grouped into 90 minute sessions covering related topics. Longer sessions, such as tutorials and classes, will be assigned 90 minute, three hour (i.e. half day), or six hour (i.e. full day) time slots. Please include: * The working title of the session * Type of session: presentation/panel/tutorial/workshop/other * A paragraph or two describing the session, suitable for the conference web site * Proposed length: 45/90 minutes, half/full day * Alternate length, if any: 45/90 minutes, half/full day * Audience: users/developers/both * Level: basic/intermediate/advanced * A biography, suitable for the conference web site * Your contact information (will not be made public) Please submit via email to conference at boost-consulting.com, with a subject that begins "BoostCon proposal" Timeline Proposals due As soon as possible. Proposals will be accepted on a first-come-first-served basis. Proposals acceptances sent As soon as accepted. Session materials due April 15, 2008. The session material go on the BoostCon CD handed out to attendees. Other arrangements Like Boost itself, BoostCon is strictly non-profit. Conference organizers are not paid for their time. Any surplus money will be rolled over into the succeeding year BoostCon budget. BoostCon provides free admission for all 90 minute and longer session presenters. This year we also hope to have enough revenue to pay presenters of longer sessions a small honorarium.

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boost::filesystem & working directories
by Robert Dailey 05 Feb '08

05 Feb '08

Is there a way to set the working directory for the entire application using boost::filesystem, or possibly another part of boost? I want to avoid using the Win32 API to do this.

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Re: [Boost-users] Another desperate request for help with a simple IOStreams sink and filter
by Chad Walters 04 Feb '08

04 Feb '08

>But when looking at the source of copy() I see there is no close() done at all. The "two stream" version of iostreams::copy() does instantiate exernal_closer for both the source and the sink, which should result in close() being called if they have the closable_tag in their category. I think your filters and devices do this based on what I can tell, but you may wish to verify that. >Is anyone actually using the library? I can't believe I'm the first > finding a bug like this in a 5 year old library. I did report a somewhat general problem with the close implementation which was biting me with certain filters: http://svn.boost.org/trac/boost/ticket/1002. Jonathan has recently fixed that problem. I am not sure this is related to your problem but you might want to see about applying those changes. If you are still having problems after that, I'd be happy to investigate further with you - I am pretty familiar with the close() implementation at this point. We are using iostreams quite extensively - the close issue mentioned above was the only problem that didn't turn out to be user error on our part. Chad On Feb 4, 2008 6:33 PM, Stefan Arentz <stefan.arentz(a)gmail.com> wrote: > I'm looking for some help with the following code where I try to > implement an aggregate filter and a sink. This super simple example is > supposed to print the xorred input but instead it prints: > > The result is: > do_filter > write: 01+x1+x,*!x76= > > Does anyone understand why the filtering and sink.write are not done > as part of the copy operation? The last two lines should be printed as > part of the copy process! It seems they are executed as part of > destructing these objects instead? I got a very useful hint on the #boost irc channel about this: calling out.reset() after the copy() made the code work correctly. I'm a confused about this though since the documentation of copy states: "The function template copy reads data from a given model of Source and writes it to a given model of Sink until the end of stream is reached. It then closes both components, using the function template close, and returns the number of characters written." But when looking at the source of copy() I see there is no close() done at all. Is anyone actually using the library? I can't believe I'm the first finding a bug like this in a 5 year old library. S.

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Review of Logging library begins today February 4th
by Gennadiy Rozental 04 Feb '08

04 Feb '08

The formal review of Logging library, proposed by John Torjo, begins today and will run till Feb 13: *Description/Motivation:* Applications today are becoming increasingly complex. Part of making them easier to develop/maintain is to do logging. Logging allows you to see what happened in your application. It can be a great help when debugging and/or testing it. The great thing about logging is that you can use it on systems in production and/or in use - if an error occurs, by examining the log, you can get a picture of where the problem is. Good logging is mandatory in support projects, you simply can't live without it. Used properly, logging is a very powerful tool. Besides aiding debugging/ testing, it can also show you how your application is used (which modules, etc.), how time-consuming certain parts of your program are, how much bandwidth your application consumes, etc. - it's up to you how much information you log, and where. *Online docs:* http://torjo.com/log2/doc/html *Download:* Package for download is available here: http://torjo.com/code/log2.zip (version v0.22.7 is targeted for review) or you can get the library from svn http://svn.boost.org/svn/boost/sandbox/logging/ *Compilation:* The Boost Logging Lib has been tested with the following compilers: VC 2005 VC 2003 gcc 3.4.2 gcc 4.1 Compiling using bjam is covered here: http://torjo.com/log2/doc/html/miscelaneous.html#misc_bjam What to include in Review Comments ================================== Your comments may be brief or lengthy, but basically the Review Manager needs your evaluation of the library. If you identify problems along the way, please note if they are minor, serious, or showstoppers. Here are some questions you might want to answer in your review: * What is your evaluation of the design? * What is your evaluation of the implementation? * What is your evaluation of the documentation? * What is your evaluation of the potential usefulness of the library? * Did you try to use the library? With what compiler? Did you have any problems? * How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? * Are you knowledgeable about the problem domain? And finally, every review should answer this question: * Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. Gennadiy Rozental - Review Manager -

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[SPAM:## 78%] [boost] Review of Logging library begins today February 4th
by Gennadiy Rozental 04 Feb '08

04 Feb '08

The formal review of Logging library, proposed by John Torjo, begins today and will run till Feb 13: *Description/Motivation:* Applications today are becoming increasingly complex. Part of making them easier to develop/maintain is to do logging. Logging allows you to see what happened in your application. It can be a great help when debugging and/or testing it. The great thing about logging is that you can use it on systems in production and/or in use - if an error occurs, by examining the log, you can get a picture of where the problem is. Good logging is mandatory in support projects, you simply can't live without it. Used properly, logging is a very powerful tool. Besides aiding debugging/ testing, it can also show you how your application is used (which modules, etc.), how time-consuming certain parts of your program are, how much bandwidth your application consumes, etc. - it's up to you how much information you log, and where. *Online docs:* http://torjo.com/log2/doc/html *Download:* Package for download is available here: http://torjo.com/code/log2.zip (version v0.22.7 is targeted for review) or you can get the library from svn http://svn.boost.org/svn/boost/sandbox/logging/ *Compilation:* The Boost Logging Lib has been tested with the following compilers: VC 2005 VC 2003 gcc 3.4.2 gcc 4.1 Compiling using bjam is covered here: http://torjo.com/log2/doc/html/miscelaneous.html#misc_bjam What to include in Review Comments ================================== Your comments may be brief or lengthy, but basically the Review Manager needs your evaluation of the library. If you identify problems along the way, please note if they are minor, serious, or showstoppers. Here are some questions you might want to answer in your review: * What is your evaluation of the design? * What is your evaluation of the implementation? * What is your evaluation of the documentation? * What is your evaluation of the potential usefulness of the library? * Did you try to use the library? With what compiler? Did you have any problems? * How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? * Are you knowledgeable about the problem domain? And finally, every review should answer this question: * Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion. Gennadiy Rozental - Review Manager - _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/ listinfo.cgi/boost

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boost lambda weirdness (possible bug?)
by David Sankel 04 Feb '08

04 Feb '08

Hello, I'm trying to use boost lambda to create a function<void (const T&)> and I can't seem to get it to work. Here's the setup: class T { public: char m_c; T( char c ) : m_c( c ) { } virtual T * clone() const=0; virtual ~T(){} }; typedef boost::shared_ptr<T> TPtr; typedef std::vector<TPtr> TVec; using namespace boost::lambda; This works: const boost::function< void( T const * const) > f = bind( &TVec::push_back, &tVec, bind( constructor<TPtr>(), bind( &T::clone, _1))); But this doesn't: const boost::function< void( const T & ) > g = bind( &TVec::push_back, &tVec, bind( constructor<TPtr>(), bind( &T::clone, boost::cref(_1) ))); The compilation error I'm getting is that it cannot create a new object of type T and that is expected since T is abstract. Why would lambda be making copies instead of passing on the reference? I've attached a simplified version of the problem. Thanks, David -- David Sankel Sankel Software www.sankelsoftware.com 585 617 4748 (Office) 585 309 2016 (Mobile)

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building boost doc
by Christian Henning 04 Feb '08

04 Feb '08

Hi there, I just have a general question about the building boost documentation. Right now when building the trunk by just using the toolset option only dynamically linked libs using the release version code are being built. To specify static linked one need to add link=static to the command line. Can someone tell where to find such information in the documentation? Same question goes for all other options that I can apply to command line, like debug builds, etc. Thanks, Christian

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How to get the full path name of a file
by Ha Ha 04 Feb '08

04 Feb '08

With leaf(), I would only get file name like 1.doc. How could I get the full path name of a certain like c:\windows\1.doc. Thanks Haha

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[Boost::Serialization] How to serialize a dynamic array within a class
by Chengyuan Ma 03 Feb '08

03 Feb '08

I have a class needs to be serialized into an XML file. I can save the object into an XML file, but i can not load it back. I found the problem is the dynamic array, "double *pMixtureWeight". What's the correct way to serialize a dynamic array into a XML file if i don't want to change it to a vector<double>? thx a lot! class Model { public: Model(); virtual ~Model() ; private: // serialization support friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int /* file_version */) { ar & boost::serialization::make_nvp("FeatureDim", FeatureDim) ; ar & boost::serialization::make_nvp("MixtureNum", NumMixtures) ; for(int ii = 0 ; ii < m_iNumMixtures; ii ++ ) { string tag = "weight_" + boost::lexical_cast<string>(ii + 1) ; ar & boost::serialization::make_nvp(tag.c_str(), pMixtureWeight[ii]) ; } } private: int FeatureDim; int NumMixtures; double *pMixtureWeight; };

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[Boost.Filesystem] Is there any bug in ofstream implementation ?
by Marc Viala Perso 02 Feb '08

02 Feb '08

Hi, I not pretty sure but it seems that there is a bug (?) somewhere in boost::filesystem::ofstream implementation in the Boost 1.34.1 release; to exhibit this behaviour, the snippet code hereafter trigger an assert in the last block: int main(int /*argc*/, char* /*argv[]*/) { const fs::path p("c:/temp/test.txt") ; const fs::wpath wp(L"c:/temp/test.txt") ; { fs::remove(p) ; fs::ofstream ofile(p) ; assert(!ofile.fail()) ; } { fs::remove(p) ; fs::ofstream ofile(wp) ; assert(!ofile.fail()) ; } { fs::remove(p) ; fs::ofstream ofile(p, std::ios_base::binary) ; assert(!ofile.fail()) ; } { fs::remove(p) ; fs::ofstream ofile(wp, std::ios_base::binary) ; assert(!ofile.fail()) ; // <-- Assert triggered here } } Running conditions: Boost 1.34.1 Visual C++ 7.1 Windows XP I'm waiting for your feedback. Best regards, Marc VIALA

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building boost libraries with VS2008 (VC9)
by Prashant Gupta 02 Feb '08

02 Feb '08

I have both VS2005 (VC8) and VS2008 (VC9) on the same machine. I have already downloaded 'boost_1_34_1.zip' and installed a complete boost distribution. On the command prompt, I go to $BOOST_ROOT and type just "bjam", with no arguments. I get the complete VC8 build in a clean way. I follow the same procedure to build using VS2008 (vc9). I go to the $BOOST_ROOT and type "bjam --toolset=msvc-9.0 stage". I get bunch of errors, resulting in failure. Could someone help me in building clean boost libraries, using VS2008 (VC9)?

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[Boost Interprocess] - Windows 64-bit / 32-bit mixed process support
by Richard Brown 01 Feb '08

01 Feb '08

Ion, I have a server process and multiple client processes which successfully share a managed_shared_memory vector as well as two message_queues. All processes are 32-bit, and run under both Windows XP and 64-bit XP Server (using 32-bit Wow emulation). However I am trying to take advantage of the Windows XP 64-bit OS, so I have attempted to build the Server process as 64-bit, while leaving the client processes at 32-bit (unfortunately I'm stuck with some 32-bit libraries and cannot move the client processes to x64 at this time). Both the server and clients (64 bit and 32 bit respectively) can see the shared memory file that Interprocess creates, and my class members use fixed-sized datatypes (__int32, __int64), but after walking some of the code it became apparent that Interprocess is having issues with mixing the different processes. Example: message_queue::do_receive(block_t block, void *buffer, std::size_t buffer_size, std::size_t &recvd_size, unsigned int &priority, const boost::posix_time::ptime &abs_time) ... ... //Thre is at least message ready to pick, get the top one detail::msg_hdr_t *top_msg = p_hdr->top_msg(); //Paranoia check if (top_msg == 0) { throw interprocess_exception(); } //Get data from the message recvd_size = top_msg->len; priority = top_msg->priority; ... ... The contents of top_msg appear to be "shifted", such that "top_msg->len;" now returns a 0. Obviously much of this is due to std::size_t being sized differently on the server process (at 64-bit) vs. the client (32-bit) processes. II thought of doing a bit of experimentation, whereby I could replace all instances of std::size_t in the library with something windows specific - like "unsigned __int64", but I have no idea if variations in data type size are the only issue. Should I give it a try or perhaps a different approach would be better? Thanks, Rich Brown if (Nabble.searchterms != null && Nabble.searchterms.length > 0) { Nabble.hilt(Nabble.searchterms, Nabble.get("nabble.msgtxt15191825")); }  //Nabble.gquery = 'test'; //Nabble.topicDumpSearch = true; if (Nabble.gquery!=null) { if (Nabble.topicDumpSearch) { Nabble.get('nabble.searchResults').innerHTML = '<h1> Other threads matching \"<strong>'+Nabble.gquery+'</strong>\":</h1>'+ '<p style=\"margin-left: 3em;\">looking for matching threads...</p>'; Nabble.loadScript('/forum/TopicDump$SearchJs.jtp?query='+encodeURIComponent(Nabble.gquery)+'&post=15191825'); Nabble.setVar('prev',null); } else { Nabble.setVar('prev', '<big><a id="nabble.prev_search" href="/forum/Search.jtp?query='+encodeURIComponent(Nabble.gquery)+'">Search Nabble for "<b>'+Nabble.gquery+'</b>"</a>' ); } } if( Nabble.prev ) Nabble.writeReturnToLink(Nabble.prev);

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Howto bind with string_algo predicates on gcc?
by Jean-Pierre Bergamin 01 Feb '08

01 Feb '08

Hello everyone I ran into an issue I cannot explain, when using bind with the string algorithms. The following code fragment works as expected with MSVC 8.0: #include <boost/algorithm/string/predicate.hpp> #include <boost/bind.hpp> #include <iostream> #include <vector> #include <string> using namespace std; using namespace boost; using namespace boost::algorithm; int main() { typedef vector<string> string_container; string_container numbers; numbers.push_back("one"); numbers.push_back("two"); numbers.push_back("three"); string_container::const_iterator s = find_if(numbers.begin(), numbers.end(), bind(&contains<string, string>, _1, "w")); if (s != numbers.end()) { cout << "Found: " << *s << endl; } return 0; } Trying to compile the same code with gcc 3.4.5 gives the error: test.cpp:18: error: no matching function for call to `bind(<unknown type>, boost::arg<1> (&)(), const char[2])' Does anyone has an idea how to let bind know the "type" of the predicate "contains"? Regards Jean-Pierre Bergamin

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type trait for detecting unsigned integer
by Stephen Torri 01 Feb '08

01 Feb '08

Is there a way to detect a unsigned integer? I would like to have a template to replace a macro that checks a value is in a range. Here is what I have so far: template <typename Limit_Type> static inline void in_range ( boost::uint32_t value, Limit_Type limit ) { if ( value > limit ) { throw errors::Internal_Exception ( errors::Internal_Exception::INVALID_VALUE ); } } I would like to replace the "boost::uint32_t" with a default typename and check to see if the 'value' is an unsigned type. Stephen

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Boost.Utility/Singleton Problem when using with dynamic libraries
by NFarnsworth＠web.de 01 Feb '08

01 Feb '08

Hello, I want to use the Boost.Utility/Singleton together with dll's. I use the Visual Studio 2005 and Windows XP. I have three dynamic libraries. In library A the Singleton is implemented and library B and C access to the Singleton. The dynamic libraries B and C are compiled with the clr compiler Option. The Problem is, that the Singleton will be twice instantiated when library A and B access to the singleton. The singleton declaration looks like the following code: //Singleton.h class Singleton : public boost::singleton<Singleton ,1,factorylib_tag > { public: CPP_API Singleton (boost::restricted); … BOOST_SINGLETON_PLACEMENT_DECLARATION … } CPP_API is a definition of the dll export. #if defined( _WIN32 ) && defined( _MSC_VER ) # if defined SINGLETON_EXPORTS # define CPP_API __declspec( dllexport ) # else # define CPP_API __declspec( dllimport ) # pragma warning( disable : 4251 ) // 'identifier' : class 'type' needs to have dll-interface to be used by clients of class 'type2' # endif #endif In the Project properties of library B and C in "additional linkage input" I included the import library of the dll A. Another problem is, that the application crashes when I close the application. The crash happens in C.dll!_CRT_INIT(void * hDllHandle=0x0f8b0000, unsigned long dwReason=0, void * lpreserved=0x00000001) line 420 -> _free_crt ( onexitbegin ) ; And also : B.dll!_CRT_INIT(void * hDllHandle=0x0f8b0000, unsigned long dwReason=0, void * lpreserved=0x00000001) line 420 -> _free_crt ( onexitbegin ) ; If I don't use the singleton, the application will not crash. Another Problem is, that I can not compile the following code: class DataPoolManagerImpl : public boost::mutexed_singleton<DataPoolManagerImpl,2,datapoollib_tag> { Then I will get the following error message: boost\utility\mutexed_singleton.hpp(212) : error C2248: "boost::mutexed_singleton<Derived,DisposalSlot>::instance_proxy": cannot access private class, which is declared in boost::mutexed_singleton<Derived,DisposalSlot> with [ Derived=DataPoolManagerImpl, DisposalSlot=2 ] \boost\utility\mutexed_singleton.hpp(41): see declaration of 'boost::mutexed_singleton<Derived,DisposalSlot>::instance_proxy' with [ Derived=DataPoolManagerImpl, DisposalSlot=2 ] \boost\utility\mutexed_singleton.hpp(211): During compiling the class template of the static data member "const boost::mutexed_singleton<Derived,DisposalSlot,SubsystemTag>::instance_proxy boost::mutexed_singleton<Derived,DisposalSlot,SubsystemTag>::instance". with [ Derived=DataPoolManagerImpl, DisposalSlot=2, SubsystemTag=datapoollib_tag ] \datapoolmanager.h(43): see reference of instantiation of compiled class template "boost::mutexed_singleton<Derived,DisposalSlot,SubsystemTag>". with [ DataPoolManagerImpl, DisposalSlot=2, datapoollib_tag ] \boost\utility\mutexed_singleton.hpp(212) : error C2440: Initialization': 'boost::mutexed_singleton<Derived,DisposalSlot>::instance_proxy' could not converted in 'boost::mutexed_singleton<Derived,DisposalSlot,SubsystemTag>::instance_proxy' with [ Derived=DataPoolManagerImpl, DisposalSlot=2 ] With : class DataPoolManagerImpl : public boost::singleton<DataPoolManagerImpl,2,datapoollib_tag> There are no compiler errors. Could you tell me how I can solve these problems please? Thank you for your help in advance and best regards Niklas _____________________________________________________________________ Unbegrenzter Speicherplatz für Ihr E-Mail Postfach? Jetzt aktivieren! http://www.digitaledienste.web.de/freemail/club/lp/?lp=7

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Question about Boost Interfaces
by Martin de Lasa 01 Feb '08

01 Feb '08

Hi, Does anyone know the status of the Boost.Interfaces Library proposed by Chris Diggins in 2004? I have found a few references to it on the internet, including one on the Boost Wiki, but it seems to not have ever made it into the official Boost library. I am interest in exploring how Aspect-Oriented Programming techniques might be incorporate into an existing code-base, and would prefer to use a library based solution, rather than a special preprocessor (eg. apsectc++). Since Boost has come to the rescue in the past (with elegant solutions), in this respect, I thought I would start here. If boost.interfaces is dead, does anyone have any suggestions for C++ library-based AOP solutions that have worked for them. Thanks in advance. Martin

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Boost MPI
by Renato Golin 01 Feb '08

01 Feb '08

Hiya, I've heard that MPI was accepted and reviewed, but I can't find it in my regular Boost distribution (ubuntu) nor in the web site. If this is the specification, I'm SO looking forward to use it. http://www.osl.iu.edu/~dgregor/boost.mpi/doc/ Do you have any ideas when / if this is going to be finally approved and distributed with Boost? cheers, --renato -- Reclaim your digital rights, eliminate DRM, learn more at http://www.defectivebydesign.org/what_is_drm

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Boost 1.34.1 build fails on openSUSE 10.3
by Christoph Duelli 01 Feb '08

01 Feb '08

Trying to build Boost 1.34.1 on OpenSuse 10.3 fails for me: soft@mxt2:/tmp/boost_1_34_1> ./configure Building Boost.Jam with toolset gcc... tools/jam/src/bin.linuxx86/bjam Detecting Python version... 2.5 Detecting Python root... /usr Unicode/ICU support for Boost.Regex?... not found. Generating Boost.Build configuration in user-config.jam... Generating Makefile... soft@mxt2:/tmp/boost_1_34_1> make ./tools/jam/src/bin.linuxx86/bjam --user-config=user-config.jam /bin/sh: line 1: 15631 Segmentation fault ./tools/jam/src/bin.linuxx86/bjam --user-config=user-config.jam Not all Boost libraries built properly. soft@mxt2:/tmp/boost_1_34_1> cat /etc/*release LSB_VERSION="core-2.0-noarch:core-3.0-noarch:core-2.0-ia32:core-3.0-ia32" openSUSE 10.3 (i586) VERSION = 10.3 I have built Boost (both this and older versions) on other machines before, so I assume the "./configure; make" should work (although I usually do specify a --prefix). Does anyone know (the cause of) this error? Thank you in advance and best regards Christoph

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BGL: return all available paths between two vertices
by Ioannis Nousias 01 Feb '08

01 Feb '08

Hello everyone. This is a Boost Graph library question. Is there an algorithm in the library that can return all available paths between two vertices? If not, which algorithm from the library is best to use as a bases, to define a custom visitor for it? (assuming that is the preferred approach) regards, Ioannis

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Cannot build boost libraries...
by BERTRAND Joël 01 Feb '08

01 Feb '08

Hello, I have to build boost-library on a sparc64 server (32 bits userland). This, I have downloaded boost_1_34_1.tar.bz2 and followed build instructions I have found. I only obtain an error that I don't understand : Root fermat:[/opt/src/boost_1_34_1] > ./configure --prefix=/opt Building Boost.Jam with toolset gcc... tools/jam/src/bin.linuxsparc/bjam Detecting Python version... 2.4 Detecting Python root... /usr Unicode/ICU support for Boost.Regex?... not found. Backing up existing Boost.Build configuration in user-config.jam.4 Generating Boost.Build configuration in user-config.jam... Generating Makefile... Root fermat:[/opt/src/boost_1_34_1] > ls boost index.htm people user-config.jam boost-build.jam Jamfile.v2 project-root.jam user-config.jam.1 boost.css Jamrules README user-config.jam.2 boost.png libs regression user-config.jam.3 configure LICENSE_1_0.txt rst.css user-config.jam.4 doc Makefile status wiki google_logo_40wht.png more tools Root fermat:[/opt/src/boost_1_34_1] > make ./tools/jam/src/bin.linuxsparc/bjam --user-config=user-config.jam Unable to load Boost.Build: could not find "boost-build.jam" --------------------------------------------------------------- Attempted search from /opt/src/boost_1_34_1 up to the root and in these directories from BOOST_BUILD_PATH and BOOST_ROOT: /usr/share/boost-build. Please consult the documentation at 'http://www.boost.org'. Not all Boost libraries built properly. Root fermat:[/opt/src/boost_1_34_1] > I don't understand why bjam does not find boost-build.jam. This file is in boost top directory. I have tried to set BOOST_BUILD_PATH and BOOST_ROOT without any other success. What is my mistake ? Regards, JKB

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