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Review Request: Polynomial
by Paweł Kieliszczyk 30 Oct '08

30 Oct '08

Hi, I'd like to request a review of my polynomial library which I wrote during Google Summer of Code project this year. The zip file is in Boost Vault (called polynomial.zip). It includes the library, tests and documentation. The same files (not compressed) are also available in sandbox: http://svn.boost.org/svn/boost/sandbox/SOC/2008/polynomial/ Thanks -- Pawel Kieliszczyk

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tie alternative?
by David Abrahams 30 Oct '08

30 Oct '08

OK, BOOST_FOREACH aside, iterating over a range returned as a pair of iterators can be painful and ugly: vertex_iterator pv, ve; tie(pv, ve) = vertices(g); // unpack the pair returned by vertices for (; pv != pe; ++pv) { ... } However, we can make it much nicer, e.g.: for (vertex_iterator pv,ve = xxx(pv,vertices(g)); pv != ve; ++pv) { ... } My only problem is how to spell xxx. The attached proof-of-concept uses operator%, but I don't feel particularly good about that choice either. Ideas? --- -- Dave Abrahams BoostPro Computing http://www.boostpro.com

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[function] support for overloaded function
by Oliver Kowalke 30 Oct '08

30 Oct '08

Hello, how can I support the return type of bind as well as function as function argument in following code. regards, Oliver #include <iostream> #include <cstdlib> #include <stdexcept> #include <boost/bind.hpp> #include <boost/function.hpp> struct X {}; struct Y { template< typename R > void f( boost::function< R() > const& fn) {} template< typename R > void f( boost::function< R( X &) > const& fn) {} }; struct Z { int u( int i) { return i; } int v( X & x, int i) { return i; } }; int main( int argc, char *argv[]) { try { Y y; X x; Z z; // does not compile y.f( boost::bind( & Z::u, z, 1) ); boost::function< int() > fn1( boost::bind( & Z::u, z, 1) ); y.f( fn1); // does not compile y.f( boost::bind( & Z::v, z, _1, 1) ); boost::function< int( X &) > fn2( boost::bind( & Z::v, z, _1, 1) ); y.f( fn2); return EXIT_SUCCESS; } catch ( std::exception const& e) { std::cerr << e.what() << std::endl; } catch ( ... ) { std::cerr << "unhandled" << std::endl; } return EXIT_FAILURE; } -- Ist Ihr Browser Vista-kompatibel? Jetzt die neuesten Browser-Versionen downloaden: http://www.gmx.net/de/go/browser

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patch to serialize mersenne_twister
by Neal Becker 30 Oct '08

30 Oct '08

Please consider adding this patch to add serialization to mersenne_twister. Since it is only active if BOOST_SERIALIZE_TWISTER is defined, it is completely harmless to those who don't use it.

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[1.37.0][serialization] Assertion failed at libs/serialization/src/extended_type_info.cpp:92
by Hartmut Kaiser 30 Oct '08

30 Oct '08

Anything I can do about this? What does this assertion mean? My setup: Linux 64Bit, gcc 4.2.4, serialization is used for polymorphic objects loaded from different shared libraries, shared libraries are loaded with dlopen(RTLD_GLOBAL|RTLD_LAZY). Assertion (extended_type_info.cpp:92) occurs during program termination (after main returned), during dlclose(). If anything else isn't possible, would it be appropriate to change the related code (before the release!) from: assert(start != end); // remove entry in map which corresponds to this type do{ if(this == *start) x.erase(start++); else ++start; }while(start != end); To: assert(start != end); // remove entry in map which corresponds to this type while(start != end) { if(this == *start) x.erase(start++); else ++start; } Which wouldn't remove the problem, but at least avoids hanging the program if assertions are off... Regards Hartmut

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[quickbook] probs with docu generation (C++ code)
by Oliver Kowalke 29 Oct '08

29 Oct '08

Hello, I've a porblem with document generation with quickbook. The code in the *.qbk files get some strange extra characters appended (in the example belwo: 'e seco'). Could please so kind to help? regards, Oliver threadpool.qbk boost::tp::pool< boost::tp::unbounded_channel< boost::tp::fifo > > pool( boost::tp::poolsize( 6), boost::posix_time::posix_time::milliseconds( 50), boost::tp::scanns(10) ); generates in the output: boost::tp::pool< boost::tp::unbounded_channel< boost::tp::fifo > > pool( boost::tp::poolsize( 6), boost::posix_time::posix_time::milliseconds( 50), boost::tp::scanns(10) ); e seco ^^^^^^^ why are this chars inserted quickbook xml output: <programlisting> <phrase role="identifier">boost</phrase><phrase role="special">::</phrase><phrase role="identifier">tp</phrase><phrase role="special">::</phrase><phrase role="identifier">pool</phrase><phrase role="special"><</phrase> <phrase role="identifier">boost</phrase><phrase role="special">::</phrase><phrase role="identifier">tp</phrase><phrase role="special">::</phrase><phrase role="identifier">unbounded_channel</phrase><phrase role="special"><</phrase> <phrase role="identifier">boost</phrase><phrase role="special">::</phrase><phrase role="identifier">tp</phrase><phrase role="special">::</phrase><phrase role="identifier">fifo</phrase> <phrase role="special">></phrase> <phrase role="special">></phrase> <phrase role="identifier">pool</phrase><phrase role="special">(</phrase> <phrase role="identifier">boost</phrase><phrase role="special">::</phrase><phrase role="identifier">tp</phrase><phrase role="special">::</phrase><phrase role="identifier">poolsize</phrase><phrase role="special">(</phrase> <phrase role="number">6</phrase><phrase role="special">),</phrase> <phrase role="identifier">boost</phrase><phrase role="special">::</phrase><phrase role="identifier">posix_time</phrase><phrase role="special">::</phrase><phrase role="identifier">posix_time</phrase><phrase role="special">::</phrase><phrase role="identifier">milliseconds</phrase><phrase role="special">(</phrase> <phrase role="number">50</phrase><phrase role="special">),</phrase> <phrase role="identifier">boost</phrase><phrase role="special">::</phrase><phrase role="identifier">tp</phrase><phrase role="special">::</phrase><phrase role="identifier">scanns</phrase><phrase role="special">(</phrase><phrase role="number">10</phrase><phrase role="special">)</phrase> <phrase role="special">);</phrase> <phrase role="identifier">e</phrase> <phrase role="identifier">seco</phrase></programlisting> -- GMX Download-Spiele: Preizsturz! Alle Puzzle-Spiele Deluxe über 60% billiger. http://games.entertainment.gmx.net/de/entertainment/games/download/puzzle/i…

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[1.37.0] beta 1 release candidate QA
by Beman Dawes 29 Oct '08

29 Oct '08

1.37.0 beta 1 release candidates are available at http://boost.cowic.de/rc/ Before pushing these out to SourceForge, we need volunteers to download and install, following the getting started guide. See http://beta.boost.org/doc/libs/1_36_0/more/getting_started/index.html Please report whether the getting started procedure works, and whether the resulting install looks OK. Thanks, --Beman PS: I've added a "five weeks before release" milestone to http://svn.boost.org/trac/boost/wiki/ReleaseSchedule, so that in the future more of these basic QA tasks get done well before the last minute.

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[BGL] bundled properties and their restrictions (particularly default constructibility).
by Geoff Hilton 29 Oct '08

29 Oct '08

Hi, my graph uses bundled properties for both vertices and edges. Both bundled properties have containers that must be of a certain size when they're actually used. For testing purposes these containers were of fixed size (underlying container is currently a boost::array<..>. However the real world dictates that the size of these containers pretty much must be determined at run-time as opposed to compile-time because the graph is built using an external source such as a file or database for example. I know the documentation requires that bundled properties be all of default constructible, assignable and copy constructible[1][2] because of how the containers (as specified by selectors) store them. I'm unsure as to whether or how this may effect algorithms provided by the BGL, so far the only ones I've used are dijkstra_shortest_path and dag_shortest_path. Given that a custom container selector may be created and push/erase must be overloaded for the given custom container (for my purposes, this would be to specify a custom allocator as in the example)[3], how safe would it be to say that the container selector entirely dictates the restrictions in question? If the answer is "very", presuming we weren't to change these restrictions for existing provided selectors would it be possible for an explicit exception to be made for custom containers and their selectors (created using boost::container_gen<>)? This exception might say that the restrictions in question are then dictated by the custom container. I figure this shouldn't affect existing user code since the current restrictions are already at their most strict. Thanks very much, Geoff [1] http://www.boost.org/doc/libs/1_36_0/libs/graph/doc/using_adjacency_list.ht… [2] Doug Gregor 23/03/2005, this list. [3] http://www.boost.org/doc/libs/1_36_0/libs/graph/doc/using_adjacency_list.ht…

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[threads] missing includes in thread.hpp
by Petr Uzel 29 Oct '08

29 Oct '08

Hi list, is there any reason why boost/thread.hpp #includes everything from boost/thread/*.hpp except condition.hpp and tss.hpp ? Is it a bug ? Thanks, -- Best regards / s pozdravem Petr Uzel, Packages maintainer --------------------------------------------------------------------- SUSE LINUX, s.r.o. e-mail: puzel(a)suse.cz Lihovarská 1060/12 tel: +420 284 028 964 190 00 Prague 9 fax: +420 284 028 951 Czech Republic http://www.suse.cz

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[ASIO/System] Checking error_code
by Carlo Medas 29 Oct '08

29 Oct '08

Dears, sorry for disturbing with peraphs stupid question, but I'm really hung: I'm not able to check the error code (boost::system::error_code) for a specific 'End of File' type. When I print it, it's 'End of file', with int value = 2. But how to check it? I tried with something like: if (error.default_error_condition() == boost::system::error_condition(boost::system::errc::XXX)) { ... } But I don't know what to put in the XXX. Br and thanks, \Carlo Medas

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