- Boost-users - lists.boost.org

Newbie conversion of C# to boost::regex
by Jonathon Douglas 12 Mar '07

12 Mar '07

I am trying to convert the following C# code over to using boost::regex MatchCollection col = new Regex(@"\w+").Matches(@"slx://account/123456"); string table = col[1].Value; string id = col[2].Value; Table would equal "account" and id would equal "123456" in this. Ive tried using regex_match with this but it always finds no matches. Any sugestions ? Thanks, JD

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Boost.Interprocess gcc 3.2.3 compilation problem
by laurent.vacca＠bnpparibas.com 12 Mar '07

12 Mar '07

Hi all, I've tried Interprocess library for a few days and everything seems to work perfectly However, when I try to compile example code with an older gcc (gcc 3.2.3), I'm getting errors regarding template instanciation /homer/lvacca/interprocess-2006--10/boost/interprocess/allocators/allocator.hpp:62: no class template named `pointer_to_other' in `boost::interprocess::detail' It seems gcc is unable to resolve the typedef in allocator.hpp (line 62) typedef typename detail::pointer_to_other <aux_pointer_t, const void>::type cvoid_ptr; to template class pointer_to_other in utilities.hpp Here are the different combos I tried: gcc 3.3 works fine with the two interprocess librairies available in boost vault (first release and october snapshot) and boost 1.33.1 gcc 3.2.3 + boost Interprocess + boost 1.33.1 fails Is gcc 3.2.3 supposed to work and compile Boost.Interprocess code ? Thanks a lot and congratulations for your great work! Laurent This message and any attachments (the "message") is intended solely for the addressees and is confidential. If you receive this message in error, please delete it and immediately notify the sender. Any use not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. The internet can not guarantee the integrity of this message. BNP PARIBAS (and its subsidiaries) shall (will) not therefore be liable for the message if modified. --------------------------------------------- Ce message et toutes les pieces jointes (ci-apres le "message") sont etablis a l'intention exclusive de ses destinataires et sont confidentiels. Si vous recevez ce message par erreur, merci de le detruire et d'en avertir immediatement l'expediteur. Toute utilisation de ce message non conforme a sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. L'internet ne permettant pas d'assurer l'integrite de ce message, BNP PARIBAS (et ses filiales) decline(nt) toute responsabilite au titre de ce message, dans l'hypothese ou il aurait ete modifie.

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[interprocess] Mutex on mac x86 fails
by Andrew Agno 12 Mar '07

12 Mar '07

I'm trying to run the following program, which works under Linux, on an intel mac: #include <boost/interprocess/sync/named_condition.hpp> #include <boost/interprocess/sync/named_mutex.hpp> #include <boost/interprocess/sync/scoped_lock.hpp> #include <iostream> using namespace std; namespace bi = boost::interprocess; int main( int argc, char **argv ) { cout << "Creating mutex" << endl; try { bi::named_mutex directoryMutex( bi::create_only, "MyVeryUniquelyNamedMutex" ); cout << "Creating scoped lock" << endl; bi::scoped_lock<bi::named_mutex> lock( directoryMutex ); cout << "All reqs met. Destroying mutex" << endl; bi::named_mutex::remove( "MyVeryUniquelyNamedMutex" ); } catch( std::exception &e ) { cout << "Problem encountered: " << e.what() << endl; } return 0; } I'm using a combination of the boost CVS for the interprocess header files and everything else from 1.33.1. The interprocess headers are current as of Mar 7. I've also tried open_or_create, and get the same result. On linux, this seems to work fine, with output: $ ./test Creating mutex Unlocking mutex Creating scoped lock All reqs met. Destroying mutex $ On the mac, it outputs: $ ./test Creating mutex Problem encountered: $ $ uname -a [...] 8.8.1 Darwin Kernel Version 8.8.1: Mon Sep 25 19:42:00 PDT 2006; root:xnu-792.13.8.obj~1/RELEASE_I386 i386 i386 $ g++ -dumpversion 4.0.1 $ g++ -dumpmachine i686-apple-darwin8

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Re: [Boost-users] boost::ref and boost:::function
by Ovanes Markarian 12 Mar '07

12 Mar '07

On Mon, March 12, 2007 15:44, Peter Dimov wrote: > Misiu wrote: >> Ovanes Markarian napisaÅ(a): >>> [...] >>> >>> You could also skip the compare_functions implementation and use >>> boost::lambda and placeholder library to write you code like this: >>> std::find_if(fun_list.begin(), fun_list.end(), _1==fun); >> >> When I tried this solution (really nice one) on MSVC 2003 I got this >> error: >> >> d:\boost_ref_test\main.cpp(18): error C2666: 'boost::operator`=='' : 4 >> overloads have similar conversions > > You can't compare two function<> objects with ==. What you can do is compare > a function<> with the actual contents. That is, My appologies. I wrote this without double checking the doc. Thought it would work, since I remembered that there was a comparison operator. With Kind Regards, Ovanes Markarian

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[lamba] boost::lambda::function_adaptor<Func>::apply means what?
by Boris 12 Mar '07

12 Mar '07

struct sample { int i; sample(int i) : i(i) { } bool odd() { return i % 2; } }; template <class T, class U> std::basic_ostream<T, U> &operator<<(std::basic_ostream<T, U>& ostr, sample s) { return ostr << s.i; } std::vector<sample> from; std::vector<sample> to; from.push_back(sample(1)); from.push_back(sample(2)); from.push_back(sample(3)); std::for_each(from.begin(), from.end(), if_then(bind(&sample::odd, _1) == false, bind(&std::vector<sample>::push_back, to, _1))); VC++ 8 displays dozens of error messages with the first one: error C2665: 'boost::lambda::function_adaptor<Func>::apply' : none of the 2 overloads could convert all the argument types Can anyone tell me how I need to change the lambda expression? Thanks, Boris

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Andy Little's Physical Quantities System
by Polder, Matthew J 12 Mar '07

12 Mar '07

Hi, does anyone know where I can get a copy of Andy Little's Physical Quantities System? I know it wasn't accepted, but I think it would be useful for a project I'm working on. It's no longer in the Boost File Vault and I can't find it via Google. thanks, matthew

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[date_time] iso time with local time differential
by Mojmir Svoboda 12 Mar '07

12 Mar '07

hello, i have simple task: convert iso time 20051108095122.5+0500 to seconds from 1900/01/01 00:00 UTC the thing is that doing something like: ... stringstream ss; local_time_input_facet * input_facet = new local_time_input_facet(); input_facet->format(local_time_facet::iso_time_format_specifier); ss.imbue(locale(ss.getloc(), input_facet)); ss << "20051108095122.5+0500"; local_date_time my_date(not_a_date_time); ss >> my_date; ... seems to drop the +-hhmm specifier and sets the zone to Z automatically in my_date. otherwise it seems to be parsed correctly. what am i doing wrong, please? mojmir This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you.

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[Serialization, XML] Suppress generation of class_id, tracking_level and version?
by Gerrit Brehmer 12 Mar '07

12 Mar '07

Hi, is it possible to suppress the in the xml-output generated attributes for object types (class_id, tracking_level and version)? Because it is better human writable/editable and in my case i have tested the reading of files w/o these attributes and it was all successful. Thanks in advance for your help!

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[Threads] Conditions and avoiding lengthy mutex locks (background loading for a game)
by Peter Mackay 11 Mar '07

11 Mar '07

Hello, I'm trying to use the Boost Threads library to help me implement a background loading system for a game I'm writing. I want to enqueue load requests while the main game thread is running, and have a separate thread load the data and pass back the appropriate objects. Currently when I enqueue a new request, I notify a 'something to do' condition, which my loading thread waits on. The trouble is, when I notify it, the loader could be loading in the background, and has a lock on the mutex connected with the condition. Would anyone be able to offer me any advice on how to solve this? Many thanks, Peter P.S. Please find attached my current implementation. begin 666 loader.cpp M(VEN8VQU9&4@(FQO861E<BYH<' B#0H-"B-I;F-L=61E(#QB;V]S="]B:6YD M+FAP<#X-"@T*;&]A9&5R.CIL;V%D97(H*0T*.B!T:')E861?<VAO=6QD7V5X M:70H9F%L<V4I#0I[#0H)=&AR96%D+G)E<V5T*&YE=R!B;V]S=#HZ=&AR96%D M*&)O;W-T.CIB:6YD*"9L;V%D97(Z.G1H<F5A9%]P<F]C+"!T:&ES*2DI.PT* M?0T*#0IL;V%D97(Z.GYL;V%D97(H*0T*>PT*"2\O(%-I9VYA;"!T:&4@=&AR M96%D('1O(&5X:70N#0H)>PT*"0EB;V]S=#HZ;75T97(a)Z.G-C;W!E9%]L;V-K M(&QO8VLH;75T97(a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` ` end begin 666 loader.hpp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`` ` end

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[graph] edmund_karp_max_flow vs kolmogorov_max_flow color map
by François Duranleau 11 Mar '07

11 Mar '07

Hi! It seems there is an inconsistency (to me) between color tagging of vertices in edmund_karp_max_flow and kolmogorov_max_flow algorithms. In the documentation of kolmogorov_max_flow, it says: "If the color of a vertex after running the algorithm is white the vertex belongs to the source tree else it belongs to the sink-tree (used for minimum cuts)." In short, vertices linked to the source are white. However, for edmund_karp_max_flow, it says: "At the end of the algorithm, the white vertices define the minimum cut set." Thus in this case, it's the vertices connected to the sink that are white. Why the difference in color tagging between the two algorithms? -- FranÃ§ois Duranleau LIGUM, UniversitÃ© de MontrÃ©al

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