November 2009 - Boost-users

[1.41.0] PDF Build of documentation available.
by John Maddock 20 Nov '09

20 Nov '09

A PDF build of the documentation for Boost-1.41 (for those libraries that support it) is now available from the usual sourceforge download site: https://sourceforge.net/projects/boost/files/ in the boost-docs/1.41.0 folder. Direct URL's are: https://sourceforge.net/projects/boost/files/boost-docs/1.41.0/boost_pdf_1_… (23Mb) https://sourceforge.net/projects/boost/files/boost-docs/1.41.0/boost_pdf_1_… (22.5Mb) https://sourceforge.net/projects/boost/files/boost-docs/1.41.0/boost_pdf_1_… (22.2Mb) https://sourceforge.net/projects/boost/files/boost-docs/1.41.0/boost_pdf_1_… (21Mb) Enjoy! John.

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boost python beginner questions...
by Jebagnana Das 20 Nov '09

20 Nov '09

Hello to all, Thank you for giving me an oppurtunity to interact with you all through this mailing list.. After installing boost python and bjam from ubuntu 9.04 repositories i can't find a clear detailed description about compiling and running the boost python program from it's tutorials .. Can any among you please tell me what are the options we need to be give to compile like g++ filename path/to/boost etc., and run this hello world boost python program http://wiki.python.org/moin/boost.python/SimpleExample using and without bjam. This is what i did. I created a c++ file named hello.cpp with the contents.. #include <string> namespace { // Avoid cluttering the global namespace. // A couple of simple C++ functions that we want to expose to Python. std::string greet() { return "hello, world"; } int square(int number) { return number * number; } } #include <boost/python.hpp> using namespace boost::python; BOOST_PYTHON_MODULE(getting_started1) { // Add regular functions to the module. def("greet", greet); def("square", square); } What should i do to make this as "a shared library and put it on the PYTHONPATH" as said in the tutorial?? (This question may sound trivial or silly but these are essential components that "must must" be included while writing a tutorial bcoz. it's gonna be read by people at all levels.. This 'll dampen the spirits of the beginner if he can't get to know how to compile and run it.. Sorry if i offended you..). FYI:I'm using python 3.1 Thanks & Regards..

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[Boost] [Spirit] parse_ast, leaf_node_d and skip parser
by Vincent Jacques 20 Nov '09

20 Nov '09

Hello, Using Boost.Spirit, when I group nodes with a leaf_node_d directive and call parse_ast, it looks like I get a node whose value includes some characters that are supposed to be skipped. My questions: am I missing anything? Is this intended? If yes, what am I missing (again)? Is there a way to work around this? Here is a simple example program (it should compile and demonstrate what I mean, with boost 1.39 and 1.40) // BEGIN OF THE PROGRAM #include <iostream> #include <boost/spirit/include/classic_core.hpp> #include <boost/spirit/include/classic_lists.hpp> #include <boost/spirit/include/classic_ast.hpp> #include <boost/spirit/include/classic_tree_to_xml.hpp> namespace bs = boost::spirit::classic; template< typename IteratorT > class OkGrammar : public bs::grammar< OkGrammar< IteratorT > > { public: template< typename ScannerT > struct definition { bs::rule< ScannerT, bs::parser_context<>, bs::parser_tag< 1 > > start() { return startRule; } definition( const OkGrammar& ) { startRule = bs::list_p( identifier, bs::ch_p( ',' ) ); identifier = +bs::alpha_p; } bs::rule< ScannerT, bs::parser_context<>, bs::parser_tag< 1 > > startRule; bs::rule< ScannerT, bs::parser_context<>, bs::parser_tag< 2 > > identifier; }; }; template< typename IteratorT > class StrangeGrammar : public bs::grammar< StrangeGrammar< IteratorT > > { public: template< typename ScannerT > struct definition { bs::rule< ScannerT, bs::parser_context<>, bs::parser_tag< 1 > > start() { return startRule; } definition( const StrangeGrammar& ) { startRule = bs::list_p( identifier, bs::ch_p( ',' ) ); identifier = bs::leaf_node_d[ +bs::alpha_p ]; } bs::rule< ScannerT, bs::parser_context<>, bs::parser_tag< 1 > > startRule; bs::rule< ScannerT, bs::parser_context<>, bs::parser_tag< 2 > > identifier; }; }; int main( int argc, char *argv[] ) { std::string input = " Hello , wor , ld "; std::map< bs::parser_id, std::string > ruleNames; ruleNames[ 1 ] = "startRule"; ruleNames[ 2 ] = "identifier"; typedef std::string::const_iterator iterator; iterator first = input.begin(); iterator last = input.end(); bs::tree_parse_info< iterator > info = bs::ast_parse( first, last, OkGrammar< iterator >(), +bs::space_p ); bs::tree_to_xml( std::cout, info.trees, input, ruleNames ); std::cout << std::endl; info = bs::ast_parse( first, last, StrangeGrammar< iterator >(), +bs::space_p ); bs::tree_to_xml( std::cout, info.trees, input, ruleNames ); } // END OF THE PROGRAM Here is the output: <?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE parsetree SYSTEM "parsetree.dtd">  <parsetree version="1.0"> <parsenode rule="startRule"> <parsenode rule="identifier"> <parsenode> <value>H</value> </parsenode> <parsenode> <value>e</value> </parsenode> <parsenode> <value>l</value> </parsenode> <parsenode> <value>l</value> </parsenode> <parsenode> <value>o</value> </parsenode> </parsenode> <parsenode> <value>,</value> </parsenode> <parsenode rule="identifier"> <parsenode> <value>w</value> </parsenode> <parsenode> <value>o</value> </parsenode> <parsenode> <value>r</value> </parsenode> </parsenode> <parsenode> <value>,</value> </parsenode> <parsenode rule="identifier"> <parsenode> <value>l</value> </parsenode> <parsenode> <value>d</value> </parsenode> </parsenode> </parsenode> </parsetree> <?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE parsetree SYSTEM "parsetree.dtd">  <parsetree version="1.0"> <parsenode rule="startRule"> <parsenode rule="identifier"> <value>Hello</value> </parsenode> <parsenode> <value>,</value> </parsenode> <parsenode rule="identifier"> <value> wor</value> </parsenode> <parsenode> <value>,</value> </parsenode> <parsenode rule="identifier"> <value> ld</value> </parsenode> </parsenode> </parsetree> In the first xml tree, there are no node with spaces, while in the second, the identifiers do have spaces. Thank you for your help, -- Vincent Jacques "S'il n'y a pas de solution, c'est qu'il n'y a pas de problème" Devise Shadock

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[Test] Spelling error in docs
by OvermindDL1 20 Nov '09

20 Nov '09

On the page: http://www.boost.org/doc/libs/1_41_0/libs/test/doc/html/tutorials/new-year-… Search for "BOOST_AUTO_EST_CASE", it needs to be replaced with "BOOST_AUTO_TEST_CASE", makes for a bad copy/paste when learning the thing... :)

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Invitation to connect on LinkedIn
by Leandro Lima 20 Nov '09

20 Nov '09

LinkedIn ------------ I'd like to add you to my professional network on LinkedIn. - Leandro Leandro Lima Programmer at Universidade Federal de Minas Gerais Brazil Confirm that you know Leandro Lima https://www.linkedin.com/e/isd/876040909/N6GauMry/ ------ (c) 2009, LinkedIn Corporation

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Heap vs. Stack allocation of filtering_streambuf??
by Eric R George 19 Nov '09

19 Nov '09

Hi Folks - I'm working on a mod to an existing program to write compressed output files. The following code works fine, but if I put the indicated code in a function, it drops core when I attempt to write to the ofile ostream - presumably because the filtering_streambuf<output> out was allocated on the stack and no longer exists after the function exits. #include <fstream> #include <iostream> #include <string> #include <boost/iostreams/filtering_streambuf.hpp> #include <boost/iostreams/filter/bzip2.hpp> using namespace std; using namespace boost::iostreams; using namespace boost::iostreams::bzip2; int main() { string x; fstream infile; infile.open("00011.eph.org", ios::in); ostream *ofile; //******* To be put in function ************************ fstream *file2; file2 = new fstream; file2->open("00011.eph.org.bz2", ios_base::out | ios_base::binary); filtering_streambuf<output> out; out.push(bzip2_compressor()); out.push(*file2); ofile = new ostream(&out); //******* To be put in function ************************ while(!infile.eof()) { getline(infile, x); *ofile << x << endl; } return 0; } //***************************************************************************** Now if I attempt to dynamically allocate the filtering_streambuf. #include <fstream> #include <iostream> #include <string> #include <boost/iostreams/filtering_streambuf.hpp> #include <boost/iostreams/filter/bzip2.hpp> using namespace std; using namespace boost::iostreams; using namespace boost::iostreams::bzip2; int main() { string x; fstream infile; infile.open("00011.eph.org", ios::in); ostream *ofile; //******* To be put in function ************************ fstream *file2; file2 = new fstream; file2->open("00011.eph.org.bz2", ios_base::out | ios_base::binary); filtering_streambuf<output> *out; out = new filtering_streambuf<output>; out->push(bzip2_compressor()); out->push(*file2); ofile = new ostream(out); //******* To be put in function ************************ while(!infile.eof()) { getline(infile, x); *ofile << x << endl; } return 0; } This code compiles and runs fine, but the compressed output file, 00011.eph.org.bz2, ends up empty. Moving the indicated code to a function again works fine - but again, no output?? The reasoning for all this is that I'd like to be able to open and set up the various output streams in a function, and then pass those streams around as needed. Which means they need to be dynamically allocated/built on the heap. But it's not working?? Ideas? What am I missing here? Thanks Eric

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[Graph] changes in 1_40
by Meththa 19 Nov '09

19 Nov '09

Hi, I've noticed that the Graph library has changed in the new version, though the documentation and the examples have not been updated. I am trying to use the fruchterman_reingold algorithm. I am confused as to the new parameters topology, origin and extent that are passed to the function. I think topology is given by xmin, ymin, xmax, ymax for a rectangular topology. For the origin, I have used topology.center() But I am at loss as to what the extent is and what I should assign it. Can someone please explain these new parameters and what values are expected. Thank you.

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How to create 1.41 Debian .deb packages?
by Joost Kraaijeveld 19 Nov '09

19 Nov '09

Hi, Can anyone tell me how I can create Debian .deb packages fro Boost 1.41, as they are not available from any repository? Preferably written down for dummies.... TIA -- Groeten, Joost Kraaijeveld Askesis B.V. Molukkenstraat 14 6524NB Nijmegen tel: 024-3888063 / 06-51855277 fax: 024-3608416 web: www.askesis.nl

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[boost::asio] Proxy with external app protocol bulk transfer recv issue.
by Patryk Bukowinski 19 Nov '09

19 Nov '09

Hello all, I'm during proxy application development. I'm forced to use external application protocol over TCP. I'm running application on windows and linux (ubuntu). Actors: - client app (sends data) - server app (receives data and sends this same data back) - MIM - my proxy Server receives all data, tries to send it back, but variously proxy stuck waiting for complete data. When issue appears: - The issue I'm struggling with, appears only on linux. - The issue shows up in various cases but always when transferring bulk data (bigger then my buffer size (essentially - 20kB). When issue doesn't appears: - The issue doesn't exist without my proxy (direct client-server connection). Both of applications are allocating this bulk data. So they send and receive data in single step. - during step debugging :) One problem I see is that protocol of that system is designed in a way that it: - uses non blocking sockets - does not check each time is socket ready (only on "handshake") which causes EAGAIN error. How i do networking: CLIENT -> PROXY -> SERVER --------------------- client_send(big_data) -> async_read(proxy_cli_sock ...) -> async_write(proxy_serv_sock ...) -> server_select() -> server_recv() = * = (until whole big data will be transfered) I haven't observed any issues here Client stack trace: fcntl64(3, F_SETFL, O_RDONLY) = 0 send(3, "\1\1\0\0\0315\f0"..., 800025, 0) = 800025 Server stack trace: (This is repeated many times, with some EAGAING errors on server) select(5, [0 3 4], [], NULL, {0, 665119}) = 1 (in [4], left {0, 664454}) recv(4, "\1\1\0\0\0315\f\0", 8, 0) = 8 recv(4, "\0\0\60"..., 800017, 0) = 59992 recv(4, 0xb36d7a90, 740025, 0) = -1 EAGAIN (Resource temporarily unavailable) gettimeofday({1257845153, 280644}, NULL) = 0 select(5, [0 3 4], [], NULL, {0, 663455}) = 1 (in [4], left {0, 662128}) recv(4, "@\0\0\5"..., 740025, 0) = 56384 .. .. (but finally whole message is received by server) SERVER -> PROXY -> CLIENT --------------------- server_select()-> serv_send(proxy_fd) -> async_read(proxy_serv_sock ...) -> async_write(proxy_cli_sock ...) -> client_select() -> client_recv(proxy_fd) select(5, [0 3 4], [4], NULL, {0, 651671}) = 1 (out [4], left {0, 651666}) send(4, "\1\00"..., 800015, 0) = 65536 send(4, "\0\\0"..., 734478, 0) = 114688 send(4, "\0\\0"..., 619790, 0) = -1 EAGAIN (Resource temporarily unavailable) gettimeofday({1257845153, 293482}, NULL) = 0 ... select(5, [0 3 4], [4], NULL, {0, 645928}) = 1 (out [4], left {0, 644732}) send(4, "\0\0\0"..., 46350, 0) = 46350 *** Above is saying that transfer is complete, but I'm missing some (unfortunately I haven't inspect which one) data packet. And here is where my proxy is waiting for a packet, (ass well as client is) gettimeofday({1257845153, 299914}, NULL) = 0 select(5, [0 3 4], [], NULL, {0, 644185}) = 0 (Timeout) .... .... I've attached whole stack trace of client and server. Please point me any kind of solution.

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Broken test results pages
by Martin_Thomas＠McAfee.com 18 Nov '09

18 Nov '09

A number of pages presenting test results appear to be broken with no content at all (not even <html></html>) Some examples: http://www.boost.org/development/tests/trunk/developer/summary_release.html http://www.boost.org/development/tests/trunk/user/summary.html http://www.boost.org/development/tests/release/user/summary_release.html http://www.boost.org/development/tests/trunk/user/index.html These are links that are found at the top of the developer summary page (http://www.boost.org/development/tests/release/developer/summary.html) or from the main testing page (http://www.boost.org/development/testing.html) Cheers // Martin Martin Thomas Sr. Software Engineer Risk and Compliance BU McAfee, Inc. 972.963.7680 Direct

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