February 2006 - Boost-users - lists.preview.boost.org

walk thru multi_index
by Dmitriy Bure 02 Feb '06

02 Feb '06

Hello, I'm very interested to use multi_index container in my work. But didn't found much documentation and\or examples. Maybe anyone could suggest a place to find it? Basically now I'm trying to implement probably very simple thing. There is basic structure: struct AvNode { CNode* var; int context; MemoryPlace location; ... }; And I'd like to have multi_index container with such nodes (all fields are non-equal). Something like this: typedef multi_index_container< AvNode, indexed_by< ordered_non_unique< tag<varNcontextIndex>, composite_key< AvNode, BOOST_MULTI_INDEX_MEMBER(AvNode,CNode*,var), BOOST_MULTI_INDEX_MEMBER(AvNode,int,context) > > > > AvNodeSet; And then I need to iterate on this container. Better to say that I'd like to group elements in container by first two fields. Could you help me in this problem? In fact I have one solution but it's too large and non-fine: AvNodeSet avNodes; typedef index<AvNodeSet, varNcontextIndex>::type AvNodesSet2VarNcontext; AvNodesSet2VarNcontext& avNodes2VarNcontext = boost::multi_index::get<varNcontextIndex>(avNodes); AvNodesSet2VarNcontext::iterator it = avNodes2VarNcontext.begin(); while(it != avNodes2VarNcontext.end()) { CNode* var = it->var; AvNodesSet2VarNcontext::iterator it2Var = it; while( (it2Var != avNodes2VarNcontext.end()) && (it2Var ->var== var) ) { int context = it2Var->context; FOO(make_pair(var, context)); AvNodesSet2VarNcontext::iterator it2Context = it2Var; while( (it2Context != avNodes2VarNcontext.end()) && (it2Context->context == context) ) { ++it2Context; } it2Var = it2Context; } it = it2Var; } Hope for your help... -- Best regards, Dmitriy Bure mailto:borech@tepkom.ru

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Re: [Boost-users] BjÃ¶rn Karlsson's Boost Book
by Merrill Cornish 02 Feb '06

02 Feb '06

John, Thanks for the information. I think I will get the book. Merrill

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[regression] Help with cw-8.3
by Ronald Garcia 02 Feb '06

02 Feb '06

Howdy, Boost.MultiArray is getting a regression error under codewarrior, and it appears to be happening in the compiler headers so far as I can tell. The basic message is: ### mwcc Compiler: # In: C:\Program Files\Metrowerks\Codewarrior\MSL\MSL_C++\MSL_Common\Include\numfacet # From: ..\libs\multi_array\test\access.cpp # -------------------------------------------- # 1387: case ios_base::hex: # Error: ^ # expression syntax error The full message can be seen at: http://engineering.meta-comm.com/boost-regression/CVS-HEAD/developer/ output/metacomm-bin-boost-libs-multi_array-test-access-test-cw-8_3- debug-threading-multi_release.html Can anyone provide insight on this? Thanks, ron

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Re: [Boost-users] Getting started with Boost: what did you need to know?
by Merrill Cornish 02 Feb '06

02 Feb '06

David, >> You're saying that all of those libraries have "here are >> all the wrong turns I took in developing this library" pages? I'm not sure this exchange is going to be of any further use. You are getting defensive and sarcastic. It's not really possible to make any sweeping statements about the Boost libraries or their documentation since they are usually each developed by a different person with different backgrounds and different goals. There's nothing inherently good or bad about that--it's simply a fact. I may in unusual in that I do RTFM--or at least try. In the case of Boost documentation, I have been repeated frustrated, usually in different ways in different libraries. So, no, all those libraries I have used don't have "wrong turn" documentation. Merrill

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Re: [Boost-users] [Serialization]: bug while serializing astd:string
by RIVASSEAU Jean Noel 02 Feb '06

02 Feb '06

Hi I have tested with a binary archive and the problem does not occur. Only text archives seem to trigger it (I have not yet tested XML archives). I have replaced all "strange" (non-letters) characters and the problem still happens. So the string contains only letters, I even removed the spaces. However do not forget that I left the line breaks in it (if I remove the line breaks, the problem does not appear). To recapitulate: the problem appears when *all* of the following conditions are met: * using a text archive * using a std::string with line breaks * with a length >=512 And even like that, I am not able to reproduce this bug in a small program, although in my program it is triggered all the time. Now, Robert, if you could look into that, I'd appreciate it... Jean-Noël _____ De : boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] De la part de Robert Ramey Envoyé : mercredi 1 février 2006 18:13 À : boost-users(a)lists.boost.org Objet : Re: [Boost-users] [Serialization]: bug while serializing astd:string This sounds like a bug to me. To help me out - check the following: try different types of archives xml, binary, etc. xml archives have a pending issue if a string contains a character (e.g. '\0') which is not representable in an xml string. Other archive classes don't have this problem. Check to see if its related to a particular character. be sure its really question of size. Robert Ramey "RIVASSEAU Jean Noel" <JN.RIVASSEAU(a)oberthurcs.com> wrote in message news:87F60F7FA02FF749AFB02BD9FCAA6B04C1D8FA@naserv31.nanterre.oberthurcs.com... Hello It seems I have come against a bug in the BSL. I am running on Win 2000 Pro, MinGW (gcc 3.4.2), Boost 1.33.1. If I serialize a standard string with 512 or more characters, the save goes ok but a stream error exception occurs while trying to reload it later from archive. Any string with size < 512 is ok. Also this bug is really strange. It does not happen if the string has no line breaks in it (even if it is more than 512 chars). It also happens on my program, but I was unable to reproduce it with a small test program, even using the same string. Could it be a bug in another part of my rather large program? Or is it really a bug in the BSL? Jean-Noël _____ _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Re: [Boost-users] Getting started with Boost: what did you need to know?
by Merrill Cornish 02 Feb '06

02 Feb '06

David, >>> So, this conclusion is from a sample of two libraries? No: filesystem, shared_ptr, any, thread, serialization, assign, date_time, format, program_options, regex, and test. Merrill

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[serialization] suggestion for the extension of the functionality
by Seweryn Habdank-Wojewódzki 02 Feb '06

02 Feb '06

Hello I would like to ask for consideration of some new functionality for boost::serialization. If I have a stream and I do not want to close the stream at the end of serialization I have to make easy, but nasty trick using stringstream as a buffer between my stream and serialized stream. More concrete example. I'am using easy library for sockets. Connection is represented as stream and after connection I do not want to close it. So when I try to use serialization though the socket, serialisation is hanging - it is waiting for the end of the stream, but there is no end of stream because it is socket. It will be useful just to add to library one fuction for manual sending data - "simulation" of the end of stream. To avoid or closing socket either using stringstreams buffers. Below is example code for this problem - this code is using buffers, but IMHO better will be that inside library will be functionality for such a situation. Best regards, Seweryn Habdank-Wojewódzki. Ps. Full code I can send if will be needed. void do_server() { string message("Hello Socket!\nHelloWorld!"); // create class instance const gps_position g(35, 59, 24.567f); try { TCPSocketWrapper sockserver; // listen on some port sockserver.listen(IPportnumber); cout << "server is ready" << endl; // accept connection from client TCPSocketWrapper sock(sockserver.accept()); cout << "accepted connection from: " << sock.address() << endl; // make the stream around the socket wrapper TCPStream stream(sock); bool oncemore = true; int command; while (oncemore) { // read the command stream >> command; switch (command) { case 1: { cout << "command 1" <<endl; // ------------------------------------------------ // buffer // ------------------------------------------------ std::ostringstream s; { boost::archive::text_oarchive oa(s); // write class instance to archive oa << g; } //------------------------------------------------------------------ // buffer //------------------------------------------------------------------ stream << s.str() << endl; } break; default: cout << "END command" << endl; oncemore = false; break; } } } catch (const SocketRunTimeException &e) { cout << "socket exception: " << e.what() << endl; } } void do_client() { string message; // ... some time later restore the class instance to its orginal state gps_position newg; try { TCPClientStream stream(IPserveraddress, IPportnumber); bool oncemore = true; int command; while (oncemore) { cout << "1. request for a serialized object" << endl; cout << "other - end" << endl; cin >> command; stream << command << endl; switch (command) { case 1: { // ------------------------------------------------ // buffer // ------------------------------------------------ std::string line; std::getline(stream, line); istringstream s(line); // ------------------------------------------------ // buffer will be filled // ------------------------------------------------ { boost::archive::text_iarchive ia(s); ia >> newg; } cout << "received: " << newg << endl; } break; default: oncemore = false; break; } } } catch (const SocketRunTimeException &e) { cout << "socket exception: " << e.what() << endl; } } -- |\/\/| Seweryn Habdank-Wojewódzki `\/\/

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building regex (extracted with bcp)
by Orhun Birsoy 02 Feb '06

02 Feb '06

I am trying to build the regex library which is extracted by the bcp utility. What I did: - extract the regex library C:\Development\3rdParty\boost_1_33_1>bcp regex c:\development\temp\regex - build it C:\Development\temp\regex\libs\regex\build>bjam "-sTOOLS=vc-8_0" "-sPYTHON_ROOT=C:\Program Files\Python24" "-sPYTHON_VERSION=2.4" --libdir=C:\development\temp\boost80\lib\ --includedir=C:\development\temp\boost80\include\boost80 --builddir=c:\development\temp\boost80\tmp install Unable to load Boost.Build: could not find "boost-build.jam" --------------------------------------------------------------- Attempted search from C:\Development\temp\regex\libs\regex\build up to the root Please consult the documentation at 'http://www.boost.org'. Now it looks like it needs several jam files in order to build. Are the make files only way to build the regex library extracted with bcp? -- Orhun Birsoy

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RE: [Boost-users] BjÃ¶rn Karlsson's Boost Book
by James Hughes 02 Feb '06

02 Feb '06

I agree. I have the book and it has been very useful (although I have not used Boost in anger just yet as project is only just starting). He really needs to do another book that covers the rest of the library! James > -----Original Message----- > From: John Maddock [mailto:john@johnmaddock.co.uk] > Sent: 02 February 2006 10:27 > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] BjÃ¶rn Karlsson's Boost Book > > > > BjÃ¶rn Karlsson has a book out titled "Beyond the C++ Standard > > Library: An Introduction to Boost". Is this book more than just a > > print out of the existing Boost HTML documentation? > > Absolutely, actually it's a very good book IMO (and not just > because I > proofread some of the chapters!). > > Basically, it looks at a selection of core Boost libraries, > and addresses > the following questions: > > What is it? > What's it good for? > How does it make my code better and more robust? > When should I use this? > How do I use it? > > So it's a bit like an extended tutorial, but it addresses the > when and why > questions much better than I've seen anywhere else. > > John. > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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BjÃ¶rn Karlsson's Boost Book
by Merrill Cornish 02 Feb '06

02 Feb '06

BjÃ¶rn Karlsson has a book out titled "Beyond the C++ Standard Library: An Introduction to Boost". Is this book more than just a print out of the existing Boost HTML documentation? Merrill

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