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

[Boost.MPI] SendingReceiving an array "view"
by Joel Falcou 27 May '09

27 May '09

I have a small class view<T> that containes a T* and a size. When I send/receive view using Boost.MPI, I want transfert the actual n data pointed by the view pointer and send the size. On receiving, i will receive the size, checks if they are compatible and receive the data into the zone pointed by the pointer of the receiving view. Of course, I may do something more complex than send/Receive, like all_2_all etc. So i was thinking to give view<T> a proper serialize function so boost.serialization may kick in. As the behavior of sending and receiving is different, I use the load/save idiom to separate the behavior. The question is then, how to serialize the n elements poitned by a raw pointer to those data in an efficient way ? Regards

4 4

Integral type with no upper limit?
by Robert Dailey 27 May '09

27 May '09

Is there an integral type in Boost that has no upper limit? The only physical limit would be the amount of memory on the system. And of course, the larger the number, the heavier the math is on such an object, because more cycles are required.

4 4

transform_iterator causing strange problems
by Lindley M French 27 May '09

27 May '09

I'm not sure if this is the fault of transform_iterator----I really don't see how it could be----but I'm really confused here. I've got an unordered_map<GroupID, Group> (typedefed to GroupMap) in my class. The specifics of those types don't matter except that GroupID is an integral type, and Group contains a std::vector vec. I'm trying to use a transform_iterator so that my class may be viewed as a group container: typedef boost::transform_iterator<GroupSelector, GroupMap::const_iterator> const_iterator; const_iterator begin() const { return boost::make_transform_iterator(currgroups.begin(),GroupSelector()); } const_iterator end() const { return boost::make_transform_iterator(currgroups.end(),GroupSelector()); } std::pair<const_iterator, const_iterator> groups() const { const Group &grp = *(begin()); return std::make_pair(begin(),end()); } Where my GroupSelector class is defined as struct GroupSelector { typedef const Group& result_type; const Group& operator()(const std::pair<GroupID, Group> &p) const { std::cout << p.second.vec.size() << " " << &p.second << std::endl; return p.second; } }; Note the output statement. Now, the usage in my main function is for (tie(iter,end) = final.groups(); iter != end; ++iter) { const Group& grp = *iter; cerr << &grp << endl; cerr << grp.segs.size() << endl; ... My output is 10 0012F50C 10 0012F65C 0012F65C 1243176 which is strange for two reasons. The first line comes from GroupSelector when I dereference begin() in the groups() function. The second comes from GroupSelector when I dereference iter in main. As these should both correspond to the same iterator, I can't understand why the address of the returned Group reference is different. The 3rd and 4th lines are outputted in main. Here's the second confusion: The address for the Group object is the same as in the most recent GroupSelector output, yet now the size of the vector within the Group comes out wrong. HUH?

5 8

Re: [Boost-users] [BGL] Trying to use subgraph
by Lindley M French 27 May '09

27 May '09

My inbox was full so I had to grab the response off the archive, hence the lack of quote. However, this: typedef boost::property<edge_index_t, size_t, EdgeProperties> EdgePropWithIndex; .... typedef boost::subgraph< boost::adjacency_list< boost::vecS,// Use list for edges boost::vecS,// Use vector for nodes boost::undirectedS,// Undirected graph SegIndex,// Nodes are segments EdgePropWithIndex// Edges have weights > > BoostGraph; still gives me compile errors: error C2065: 'edge_index_t' : undeclared identifier error C3203: 'property' : unspecialized class template can't be used as a template argument for template parameter 'EdgeProperty', expected a real type On a (possibly) related note, I'm trying to use the above subgraph in kruskal_minimum_spanning_tree(), but it's giving me an error about error C2039: 'vertex_bundled' : is not a member of 'boost::subgraph<Graph>' I'm quite sure this error didn't appear before I started trying to use the subgraph adapter.....any idea what's wrong?

2 19

symmetric_matrix operation
by Archie14 26 May '09

26 May '09

I am very new to the whole Ublas library. I have two symmetric matrices and I need to divide each element of the first matrix to the element in the second matrix. I am now doing smth like this: int _matrixsize; symmetric_matrix<double> mfirst(_matrixsize); symmetric_matrix<double> msecond(_matrixsize); symmetric_matrix<double> ratio (_matrixsize); for (int ifirst = 0; ifirst < _matrixsize; ifirst++) for (int isecond = 0; isecond < _matrixsize; isecond++) ratio(ifirst, isecond) = mfirst(ifirst, isecond) / msecond (ifirst, isecond); My questions are: 1. Can I use iterators (begin1, begin2) and if yes, then how? Examples in the doc use above method of iterating through elements, without using iterators. 2. I did not find built-in operators in the symmetric_matrix to do this division, but may be I overlooked smth or did not understand the docs? 3. If matrix "msecond" contains zeros - what is the "boost-way" to deal with this?

2 2

Re: [Boost-users] [Serialization] Guard against attempting to deserialize the wrong type
by Dan Eaton 26 May '09

26 May '09

Robert, Could you please clarify what you mean by that? Do you mean the first and last tags of the archive are checked? I can't reproduce that behaviour either. int foo = 1; unsigned int bar =1; // create stream & output xml archive oarchive << BOOST_SERIALIZATION_NVP(foo); // create input xml archive from stream iarchive >> BOOST_SERIALIZATION_NVP(bar); This deserializes happily. Thanks, Danny From: Dan Eaton Sent: Monday, May 25, 2009 1:30 PM To: 'boost-users(a)lists.boost.org' Subject: [Serialization] Guard against attempting to deserialize the wrong type Hello, I'm just wondering if NVP/XML archives check the name during deserialization? I just had a problem whereby I tried deserializing an object to one type, but the archive actually contained a different (larger ) object type. The first serialized element of the object just so happened to be an unsigned int, and I was trying to deserialize an enum, so the output actually seemed sensible, and didn't cause any problems until I later deserialized the full object from the same archive, which caused a segmentation fault in the boost::serialize source (trying to get ETI from a null pointer). I was using a polymorphic text archive, and as I mentioned above, am wondering if I switched to an XML archive if this sort of user-error would be detected. Thanks, Dan Eaton Software Developer Acceleware Corp. (TSX-V:AXE) www.acceleware.com<http://www.acceleware.com/> Phone: +1.403.249.9099 Ext.295 Fax: +1.403.249.9881 Email: daniel.eaton(a)acceleware.com<mailto:daniel.eaton@acceleware.com> Get superpowered! Acceleware gets your products to market faster, better and stronger! This e-mail may contain information that is privileged and confidential and subject to legal restrictions and penalties regarding its unauthorized disclosure or use. You are prohibited from copying, distributing or otherwise using this information if you are not the intended recipient. If you have received this e-mail in error, please notify us immediately by return e-mail and delete this e-mail and its attachments from your system. Thank you. (c) 2008 Acceleware, Inc. All Rights Reserved

2 1

Question about enable_if / disable_if
by Zachary Turner 26 May '09

26 May '09

Suppose I have a template function template<typename T> void f(const std::string&, T); which I want there to be a couple of different variants of. Version 1 - Enabled if and only if boost::is_same<T, bool> Version 2 - Enabled if and only if boost::is_same<T, foo> (foo is a class) Version 3 - Enabled if and only if boost::is_enum<T> Version 4 - Otherwise Is there an easy way to express this? It seems I run into a bunch of overload ambiguity problems. I'm sure I can get around this by adding to every version the negation of all the other conditions, but this seems unnecessarily complicated.

4 3

Second call: The Boost Bug Sprint is coming!!
by Marshall Clow 26 May '09

26 May '09

The boost bug sprint is coming! It starts _this_ Friday, May 28th, and runs through Sunday June 7th. The goal is to address a large number of open bugs/patches/feature requests in the Trac system at <http://svn.boost.org/trac/report/1>. There are currently 791 open tickets; we'd like to knock that number down _a lot_. What can you do? 1) You can fix bugs. * If you are a library maintainer, you can commit your fixes. ;-) * If you are not a library maintainer, you can fix a problem on your local machine (and test it!!), and then attach your fix as a patch to the Trac ticket for the library maintainer to commit. If you do this, please provide a test case that exercises the problem; i.e, one that fails w/o your patch, and succeeds afterwards. 2) You can characterize bugs. * You can attempt to replicate the bug on your system(s), and attach information that you discover to the Trac ticket. This will make it easier for other people to solve the problem, even if you cannot. * You can write test cases demonstrating the problem, and attach them to the Trac ticket. * You can determine if the bug still exists; sometimes they get fixed, and the ticket never gets closed. In this case, try to identify a checkin that addresses the bug; it's always suspicious when bugs go away "by accident." 3) You can test patches. * Some of the tickets in the Trac system contain patches - some are quite old. You can install these patches on your system, and determine if they (a) build, and (b) work. * You can write test cases for the patches, and attach them to the ticket. 4) You can help implement new features. * There are a whole set of "feature requests" in the Trac system. If you have an idea about one of these, you can add comments to the Trac system. You can attempt to implement these new features, and attach the patch to the ticket. (Don't forget the test cases!!). Every day during the bug sprint, I'll post the # of tickets modified/closed/opened on the previous day, as well as the total number of open tickets. --------- Sign-up sheet -------- The following people have committed to participate in the bug sprint. Please add you name here, along with what you can do. 1) Marshall Clow (coordination, Mac OS X characterization) 2) Beman Dawes (filesystem, system, timer) 3) Doug Gregor (function, graph, logic, mpi, numeric, property_map, signals) 4) "joel falcou" <joel.falcou(a)u-psud.fr> ( linux gcc testing/VC 2008 testing, patching) 5) Michael Caisse <boost(a)objectmodelingdesigns.com> (bug fixing) 6) Jeremiah Willcock <jewillco(a)osl.iu.edu> (will test and commit graph patches) 7) David Abrahams (iterator, python) 8) Sohail Somani (patches for g++ 4.2.4) -- -- Marshall Marshall Clow Idio Software <mailto:marshall@idio.com> It is by caffeine alone I set my mind in motion. It is by the beans of Java that thoughts acquire speed, the hands acquire shaking, the shaking becomes a warning. It is by caffeine alone I set my mind in motion.

1 0

Units library and wstring
by Macumber, Daniel 26 May '09

26 May '09

Hello, my group has been simultaneously incorporating the boost units library into our code as well as converting all internal strings from std::string to std::wstring. I am having difficulty merging the changes, it seems that the boost units library has hard coded std::string as the return type for the methods which print units, powers, etc. Is there an easy way to template use of the units library on wchar_t instead of char? Are there any other suggestions on how to use the units library in a program which uses wstring for everything else? Thanks a lot, Dan

2 1

[BGL] dijkstra_shortest_paths on dynamically growing and shrinking graphs
by Ingo Maindorfer 26 May '09

26 May '09

Hello, consider the follwoing Graph: struct EP { double weight; }; typedef boost::adjacency_list< boost::listS, boost::vecS, boost::directedS, boost::no_property, EP > Graph; The call of dijkstra_shortest_paths is clear to me on that graph: boost::dijkstra_shortest_paths( m_graph, a_start_idx, weight_map( m_weight_map ).distance_map( &distance_vector[0]).predecessor_map( &parent_vector[0] ) ); where parent_vector and distance_vector are plain std::vector of the according size. Over time, I have to remove the "oldest" edges and vertices with lower index via remove_vertex() and remove_edge() from the graph and add some "newer" edges and vertices to the graph. My problem is, that the dijkstra_shortest_paths method dosen't work when I provide a plain std::vector to the distance_map() and predecessor_map() parameter of the dijkstra_shortest_paths call because of the mapping from the vertex descriptor to position in the vector. Can anybody tell me how to provide the "right" type of parameter for distance_map() and predecessor_map() ? Maybe something like boost::property_map< Graph, double EP::*>::type m_weight_map = boost::get( &EP::weight, graph ); that I'm already have done for the weight_map parameter but I'm looking for something that can handle the mapping stuff of vertex descriptors correctly. Performance is not a subject because of a few hundred vertices and edges. I'm on Boost 1.39. Kindly, Ingo

2 1

Re: [Boost-users] wide-char version of boost::mapped_file?
by Tan, Tom (Shanghai) 26 May '09

26 May '09

By borrowing code from boost::filesystem V3, I re-implemented the to_string function like this: std::string to_string(const wstring& ws) { const size_t BUFFER_SIZE = (ws.size() << 1) + 1; shared_array<char> p_mcb(new char[BUFFER_SIZE]); int count = ::WideCharToMultiByte( AreFileApisANSI() ? CP_THREAD_ACP : CP_OEMCP, WC_NO_BEST_FIT_CHARS, ws.c_str(), ws.size(), p_mcb.get(), BUFFER_SIZE, 0, 0 ); return (-1 == count) ? std::string() : std::string(p_mcb.get(), count ); } This seems to have solved the conversion problem. Is it possible to add an overloaded constructor based on this code to take std::wstring or just take a boost::path when V3 comes out.? It would ease the usage a lot in my opinion. -----Original Message----- From: Tan, Tom (Shanghai) Sent: 2009-05-26 11:55 To: 'boost-users(a)lists.boost.org' Subject: wide-char version of boost::mapped_file? I am trying to use boost::mapped_file in the iostream library. While I like the interface. The fact that it only supports the ANSI version of windows API, thus dictating an ANSI version of file path, really drives me crazy. In my code I use std::wstring everywhere. Because boost::mapped_file asked for a std::string to construct like this: explicit mapped_file( const std::string& path, std::ios_base::openmode mode = std::ios_base | std::ios_base, size_type length = max_length, boost::intmax_t offset = 0 ); I wrote a small routine to convert it like this: std::string to_string(const wstring& ws) { const size_t BUFFER_SIZE = (ws.size() << 1) + 1; shared_array<char> p_mcb(new char[BUFFER_SIZE]); setlocale( LC_ALL, ".2052"); size_t count = wcstombs(p_mcb.get(), ws.c_str(), BUFFER_SIZE ); return (-1 == count) ? std::string() : std::string(p_mcb.get()); } It does not really work well when I have Enlish and Chinese characters mixed together in the path, while it does for pure Chinese paths. So I traced down to the source code to find out why a std::string instead of basic_string<Char> is needed, anyway, it's just a path, and has nothing to do with mapping it does. There seems to be no clue except for the ANSI version of Win32 APIs, which actually have wide-char versions. Did I missing any design requirement that force it to be like what it is today? Another issue is, it throws exception from inside the constructor when it tries to map a zero-length file. IMHO, it's not good to throw for a legal file, be its length zero, and not good to throw from the constructor either.

1 0

wide-char version of boost::mapped_file?
by Tan, Tom (Shanghai) 26 May '09

26 May '09

I am trying to use boost::mapped_file in the iostream library. While I like the interface. The fact that it only supports the ANSI version of windows API, thus dictating an ANSI version of file path, really drives me crazy. In my code I use std::wstring everywhere. Because boost::mapped_file asked for a std::string to construct like this: explicit mapped_file( const std::string& path, std::ios_base::openmode mode = std::ios_base | std::ios_base, size_type length = max_length, boost::intmax_t offset = 0 ); I wrote a small routine to convert it like this: std::string to_string(const wstring& ws) { const size_t BUFFER_SIZE = (ws.size() << 1) + 1; shared_array<char> p_mcb(new char[BUFFER_SIZE]); setlocale( LC_ALL, ".2052"); size_t count = wcstombs(p_mcb.get(), ws.c_str(), BUFFER_SIZE ); return (-1 == count) ? std::string() : std::string(p_mcb.get()); } It does not really work well when I have Enlish and Chinese characters mixed together in the path, while it does for pure Chinese paths. So I traced down to the source code to find out why a std::string instead of basic_string<Char> is needed, anyway, it's just a path, and has nothing to do with mapping it does. There seems to be no clue except for the ANSI version of Win32 APIs, which actually have wide-char versions. Did I missing any design requirement that force it to be like what it is today? Another issue is, it throws exception from inside the constructor when it tries to map a zero-length file. IMHO, it's not good to throw for a legal file, be its length zero, and not good to throw from the constructor either.

1 0

Re: [Boost-users] [Serialization] Guard against attempting to deserialize the wrong type
by Dan Eaton 25 May '09

25 May '09

Actually, it doesn't seem to be doing any check... looking at the contents of the XML emitted, the name is definitely different than the one I'm requesting. oarchive << BOOST_SERIALIZATION_NVP(foo); iarchive >> BOOST_SERIALIZATION_NVP(bar); This works fine where foo & bar are the same type (using xml_iarchive / oarchive) Am I doing something wrong? From: Dan Eaton Sent: Monday, May 25, 2009 1:30 PM To: 'boost-users(a)lists.boost.org' Subject: [Serialization] Guard against attempting to deserialize the wrong type Hello, I'm just wondering if NVP/XML archives check the name during deserialization? I just had a problem whereby I tried deserializing an object to one type, but the archive actually contained a different (larger ) object type. The first serialized element of the object just so happened to be an unsigned int, and I was trying to deserialize an enum, so the output actually seemed sensible, and didn't cause any problems until I later deserialized the full object from the same archive, which caused a segmentation fault in the boost::serialize source (trying to get ETI from a null pointer). I was using a polymorphic text archive, and as I mentioned above, am wondering if I switched to an XML archive if this sort of user-error would be detected. Thanks, Dan Eaton Software Developer Acceleware Corp. (TSX-V:AXE) www.acceleware.com<http://www.acceleware.com/> Phone: +1.403.249.9099 Ext.295 Fax: +1.403.249.9881 Email: daniel.eaton(a)acceleware.com<mailto:daniel.eaton@acceleware.com> Get superpowered! Acceleware gets your products to market faster, better and stronger! This e-mail may contain information that is privileged and confidential and subject to legal restrictions and penalties regarding its unauthorized disclosure or use. You are prohibited from copying, distributing or otherwise using this information if you are not the intended recipient. If you have received this e-mail in error, please notify us immediately by return e-mail and delete this e-mail and its attachments from your system. Thank you. (c) 2008 Acceleware, Inc. All Rights Reserved

2 1

[Serialization] Guard against attempting to deserialize the wrong type
by Dan Eaton 25 May '09

25 May '09

Hello, I'm just wondering if NVP/XML archives check the name during deserialization? I just had a problem whereby I tried deserializing an object to one type, but the archive actually contained a different (larger ) object type. The first serialized element of the object just so happened to be an unsigned int, and I was trying to deserialize an enum, so the output actually seemed sensible, and didn't cause any problems until I later deserialized the full object from the same archive, which caused a segmentation fault in the boost::serialize source (trying to get ETI from a null pointer). I was using a polymorphic text archive, and as I mentioned above, am wondering if I switched to an XML archive if this sort of user-error would be detected. Thanks, Dan Eaton Software Developer Acceleware Corp. (TSX-V:AXE) www.acceleware.com<http://www.acceleware.com/> Phone: +1.403.249.9099 Ext.295 Fax: +1.403.249.9881 Email: daniel.eaton(a)acceleware.com<mailto:daniel.eaton@acceleware.com> Get superpowered! Acceleware gets your products to market faster, better and stronger! This e-mail may contain information that is privileged and confidential and subject to legal restrictions and penalties regarding its unauthorized disclosure or use. You are prohibited from copying, distributing or otherwise using this information if you are not the intended recipient. If you have received this e-mail in error, please notify us immediately by return e-mail and delete this e-mail and its attachments from your system. Thank you. (c) 2008 Acceleware, Inc. All Rights Reserved

2 1

[ASIO / Serialization] How to avoid the copy?
by Dan Eaton 25 May '09

25 May '09

Hello, Referring to the boost::asio "Serialization" example, and specifically to the file connection.hpp which handles serialization over sockets: http://www.boost.org/doc/libs/1_37_0/doc/html/boost_asio/example/serializat… When new data is to be received, first the message header is read, which contains the number of bytes for the body. Storage must be allocated to receive the body, and is then passed into ::read as boost::asio::buffer. For the purpose of using Serialize, it must then be converted to an std::istream, (in the example above, istringstream). As shown in the example, this requires an extra copy to be held in memory for the std::string. What's the best route to avoid this copy? Thanks, Dan Eaton Software Developer Acceleware Corp. (TSX-V:AXE) www.acceleware.com<http://www.acceleware.com/> Phone: +1.403.249.9099 Ext.295 Fax: +1.403.249.9881 Email: daniel.eaton(a)acceleware.com<mailto:daniel.eaton@acceleware.com> Get superpowered! Acceleware gets your products to market faster, better and stronger! This e-mail may contain information that is privileged and confidential and subject to legal restrictions and penalties regarding its unauthorized disclosure or use. You are prohibited from copying, distributing or otherwise using this information if you are not the intended recipient. If you have received this e-mail in error, please notify us immediately by return e-mail and delete this e-mail and its attachments from your system. Thank you. (c) 2008 Acceleware, Inc. All Rights Reserved

3 2

[ASIO / Serialization] How to avoid the copy?
by Dan Eaton 25 May '09

25 May '09

Ah, yes, it looks like it does have something like that (an implementation of streambuf). Thanks! Dan Eaton Software Developer Acceleware Corp. (TSX-V:AXE) www.acceleware.com<http://www.acceleware.com/> Phone: +1.403.249.9099 Ext.295 Fax: +1.403.249.9881 Email: daniel.eaton(a)acceleware.com<mailto:daniel.eaton@acceleware.com> Get superpowered! Acceleware gets your products to market faster, better and stronger! This e-mail may contain information that is privileged and confidential and subject to legal restrictions and penalties regarding its unauthorized disclosure or use. You are prohibited from copying, distributing or otherwise using this information if you are not the intended recipient. If you have received this e-mail in error, please notify us immediately by return e-mail and delete this e-mail and its attachments from your system. Thank you. (c) 2008 Acceleware, Inc. All Rights Reserved

1 0

[serialization] appending to an archive
by hurcan solter 25 May '09

25 May '09

I am trying to append one or more records to the existing archive file, using something like this; void Logger::save(const std::string& fileName) { assert(fileName != "logger.dmp"); bp::time_duration endRecordTime = getCurrentTime(); ofs.flush(); path dst = complete(path(fileName, native)); path src = complete(path("logger.dmp", native)); remove(dst); copy_file(src, dst); ofstream saveFile(dst,std::ios::app); ArchiveType archive(saveFile,boost::archive::no_header); *mArchive << endRecordTime } although i specify no_header flag, it inserts a '0' as a preamble, how can i turn it off? have you guys ever needed to use serialization like this? what was your solution Thanks in advance Hurcan

2 1

[Container] ptr_set with user define compare function
by 梁绍池 25 May '09

25 May '09

I've defined a function object as below: struct BaseAddrLess : public std::binary_function<Base, Base, bool> { result_type operator() (const first_argument_type& lhs, const second_argument_type& rhs) const { return &lhs < &rhs; } }; and use as a compare function in ptr_set like this: ptr_set<Base, BaseAddrLess> bset; when the class Base is a abstract class the vc9 compiler will complain use of undefined type 'boost::result_of<F>' What causes this problem? How to solve it? Thank you for your patience to read my poor english. S.C. Leung

3 3

exception: use of error_info can mask real exceptions
by Andrew Venikov 25 May '09

25 May '09

Just wanted to ask if there were commonly accepted solutions to the following problem: typedef boost::error_info<struct tag_f1, std::string> f1_descr; and then throw f1exception() << f1_descr("blah blah blah"). and later catch(f1exception & ex){...} The constructor of std::string may throw an exception in which case f1exception will never be thrown. This is not necessarily the desired outcome as the intention was obviously to indicate f1exception error, not the string() error. This problem pertains to any type that throws exceptions in its constructor and is used with error_info idiom. What may be more appropriate is something like this typedef boost::error_info<struct tag_f1, shared_pointer<string> > f1_descr ... error condition is detected shared_ptr<string> pErrStr; try { pErrStr = new string("Error description"); } catch(bad_alloc & ex) { } throw f1exception() << f1_descr(pErrStr); Meaning that if string fails to allocate memory, I'm willing to forgo the error description but still throw the intended exception. Is there a cleaner way to do that? Thanks, Andy.

7 14

boost::thread_specific_ptr
by jono 25 May '09

25 May '09

hi all, i'm using thread_specific_ptr (boost 1.33.1, sorry) in a plugin architecture, where the tls identifies a singleton object of type Context (initialized using DCLP). boost::thread_specific_ptr<Context> Context::instance_; i also have a set of shared libraries and a main executable linked against a static library defining the Context class. this all works fine so long as the libraries are loaded and the threads created in that order, however, if a library is loaded after thread is started, then the thread_specific_ptr in that thread appears to be reset to null, without calling cleanup(). if i use the debugger to inspect the singleton ptr before and after loading the second module, it is, before: $1 = {<boost::noncopyable_::noncopyable> = {<No data fields>}, m_tss = {<boost::noncopyable_::noncopyable> = {<No data fields>}, m_slot = 8}} ..and after: $2 = {<boost::noncopyable_::noncopyable> = {<No data fields>}, m_tss = {<boost::noncopyable_::noncopyable> = {<No data fields>}, m_slot = 1}} is this correct behaviour for thread_specific_ptr? is there a way i can obtain a handle for the first Context object before it is destroyed? here's some info about my system. $ cat /proc/cpuinfo ... AMD Athlon(tm) 64 X2 Dual Core Processor 3800+ ... $ uname -a Linux lumpen 2.6.19 #2 SMP Fri Jan 12 17:58:33 NZDT 2007 x86_64 x86_64 x86_64 GNU/Linux $ gcc -v Using built-in specs. Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic --host=x86_64-redhat-linux Thread model: posix gcc version 4.1.1 20060525 (Red Hat 4.1.1-1) any help would be appreciated. cheers, Jono

1 0

Build 1.39.0 under VC2010?
by Mantas Matelis 24 May '09

24 May '09

Hi, is vc10 support implemented? And if so, is this the right way to build for vc10:bjam.exe --build-dir="c:\development\boost" --prefix="c:\development\boost" --build-type=complete toolset=msvc-100 stage > C:\development\boost\build-output-vc10.txt When running this, everything builds, but the files have improper names. Visual studio expects libboost_filesystem-vc100-mt-gd-1_39.lib but in the stage directory there are no files with vc100, just vc.

2 2

How do I build with an alternate compiler location?
by Eric Brown 24 May '09

24 May '09

I'm trying to build on freebsd 4. (Those are my production machines, so I'm stuck.) The default install is gcc 2.95 and freebsd's old ports tree contains patches to build boost's libraries. However, when I try to include boost include files, it inevitably complains about any number of templates gcc can't grok. I suppose I can maybe build the libs with gcc 2.95 and my code with gcc 3.4.6, but I'd rather build boost with 3.4.6 too. Plus, the patches are for boost 1.32 and I'd rather use a later version of boost. However, gcc34 installs into /usr/local/bin/gcc34 and a bunch of include files I'd usually specify -I directives in my CXXFLAGS in my makefile. I'm just not clear how to set these overrides for bjam. I've looked at the bjam docs, but it just seems a lot more complicated than it should be. Cheers, Eric

3 2

ICMP Ping ASIO
by cmicel1＠cct.lsu.edu 23 May '09

23 May '09

I am trying to recreate a simple ping utility that utilizes the Internet Control Message Protocol(ICMP) to gather information about a host. Boost ASIO has an implementation of the ICMP protocol and presents this protocol as a method to transmit messages similar to UDP or TCP. I need to create ICMP messages that are crafted with certain control messages (0 - Echo Reply, 8 - Echo Request), but I am unsure of how asio crafts messages when this protocol is in use. I do not want to utilize a server application for my network diagnosis and figured that this would be the appropriate method. Any information on the subject matter would be helpful to me. -Chris

1 0

Noob question - undefined reference to boost::system::get_system_category
by mx270a 23 May '09

23 May '09

I'm a relatively new to programming on Linux, previous experience was with VB.net in Windows. I'm trying to make the switch to C++, but I'm having a difficult time. I started to follow one of the basic tutorials for Boost ASIO, but I can't get it to compile with the ASIO.hpp file included. The environment is Kubuntu 9.04 and Kdevelop 3.5.3. Code: ---------------- #include <boost/asio.hpp> int main() { return 0; } ---------------- Compile Messages and Errors: ---------------- cd '/home/lance/TS1/debug' && WANT_AUTOCONF_2_5="1" WANT_AUTOMAKE_1_6="1" LC_MESSAGES="C" LC_CTYPE="C" make -k make all-recursive Making all in src compiling ts1.cpp (g++) mv -f .deps/ts1.Tpo .deps/ts1.Po linking ts1 (g++) linking ts1 (g++) ts1.o: In function `__static_initialization_and_destruction_0': /usr/include/boost/system/error_code.hpp:205: undefined reference to `boost::system::get_system_category()' /usr/include/boost/system/error_code.hpp:206: undefined reference to `boost::system::get_generic_category()' /usr/include/boost/system/error_code.hpp:211: undefined reference to `boost::system::get_generic_category()' /usr/include/boost/system/error_code.hpp:212: undefined reference to `boost::system::get_generic_category()' /usr/include/boost/system/error_code.hpp:213: undefined reference to `boost::system::get_system_category()' ts1.o: In function `boost::asio::error::get_system_category()': /usr/include/boost/asio/error.hpp:218: undefined reference to `boost::system::get_system_category()' ts1.o: In function `posix_tss_ptr': /usr/include/boost/asio/detail/posix_tss_ptr.hpp:47: undefined reference to `pthread_key_create' ts1.o: In function `~posix_tss_ptr': /usr/include/boost/asio/detail/posix_tss_ptr.hpp:61: undefined reference to `pthread_key_delete' collect2: ld returned 1 exit status make[2]: *** [ts1] Error 1 make[2]: Target `all' not remade because of errors. make[2]: Nothing to be done for `all-am'. make[1]: *** [all-recursive] Error 1 make: *** [all] Error 2 *** Exited with status: 2 *** ---------------- How do I resolve the boost::system errors? Thanks, Lance -- View this message in context: http://www.nabble.com/Noob-question---undefined-reference-to-boost%3A%3Asys… Sent from the Boost - Users mailing list archive at Nabble.com.

4 5

[wave] assertion failed - multithread issue?
by Ein Held 23 May '09

23 May '09

Hello when parsing some cpp files via boost.wave using multiple threads, I randomly get a failed assertion. "Assertion failed: static_cast<RefCountType>(*d.begin()) != 0, file C:\projekte\libs\boost\include\boost-1_38/boost/wave/util/flex_string.hpp, line 1216" I am pretty sure that this is a multi-thread issue, as when using only one thread to parse the files, everything works fine. Unfortunately I cannot give you more specific information as I cannot get gdb to run on my system. I am using gcc 4.3.3 Thank you

2 2