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[math] [PING] common_factor_test
by Vladimir Prus 30 Nov '06

30 Nov '06

The math's library common_factor_test still fails on 3 platforms due to problems in the test itself. John's posted a patch, but it's not checked in yet, as far I can tell. Daryle, would it be possible to you to look at the patch ASAP? If you're out of time at the moment, perhaps we can trust John's judgement on portability issues and check the patch in right away? Thanks, Volodya

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[ptr_container] and [multi_index] ?
by Janek Kozicki 30 Nov '06

30 Nov '06

Hi, Is it possible to use those two together? I'm considering storing my polymorphic stuff into ptr_container but vector (or other standard containers) are not enough for my needs. Using Boost.MultiIndex with Boost.PtrContainer would be great. -- Janek Kozicki |

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Asio: very strange problem
by berserker_r 29 Nov '06

29 Nov '06

I'm still trying to implement a multithreaded http server with asio: the problem I have reported in the past about IOCP looks fixed but now I'm falling in another one...If you try the following example it will works well with IE6 and Opera 9 but not with Firefox 2.0 (it always detect an aborted connection). To make it works with Firefox just uncomment the "Sleep(0)". Obiously I don't think that the problem is related to Firefox, but I cannot understand why it works well with others browsers... class Session { public: Session(boost::asio::io_service &service) : m_socket(service) { } ~Session() { m_socket.close(); } boost::asio::ip::tcp::socket & socket() { return m_socket; } void run() { //Sleep(0); // Uncomment this line to make it works in Firefox m_socket.async_read_some(boost::asio::buffer(m_buffer), boost::bind(&Session::read_handler, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } void read_handler(const boost::system::error_code &e, size_t bytes_transferred) { if(!e) { static int counter = 0; std::stringstream stream; stream << "<html><body><h2>Hello" << ++counter << "</h2></body></html>"; m_response = stream.str(); boost::asio::async_write(m_socket, boost::asio::buffer(m_response), boost::bind(&Session::write_handler, this, boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } } void write_handler(const boost::system::error_code &e, size_t bytes_transferred) { delete this; } private: boost::asio::ip::tcp::socket m_socket; boost::array<char, 8192> m_buffer; std::string m_response; }; class Server { public: Server(int port) : m_service(), m_acceptor(m_service) { boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::tcp::v4(), port); m_acceptor.open(endpoint.protocol()); m_acceptor.bind(endpoint); m_acceptor.listen(); accept(); } void accept() { Session *connection = new Session(m_service); m_acceptor.async_accept(connection->socket(), boost::bind(&Server::accept_handler, this, boost::asio::placeholders::error, connection)); } void run(int threads = 10) { boost::thread_group threads_pool; while(threads-- > 0) threads_pool.create_thread(boost::bind(&boost::asio::io_service::run, &m_service)); m_service.run(); } void accept_handler(const boost::system::error_code &e, Session *connection) { if(!e) { connection->run(); accept(); } } protected: boost::asio::io_service m_service; boost::asio::ip::tcp::acceptor m_acceptor; }; int main(int argc, char **argv) { Server server(7070); server.run(); return 0; }

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Re: [boost] New getting started guide
by Sohail Somani 29 Nov '06

29 Nov '06

> -----Original Message----- > From: boost-bounces(a)lists.boost.org > [mailto:boost-bounces@lists.boost.org] On Behalf Of David Abrahams > > I don't know what you're talking about. Boost has never (or at least, > not for many years) officially supported the approach you're > suggesting of "no separate compilation for all libraries", so > incompatibility with it is not a change or a start down a slippery > slope: we're already at the bottom of that slope. If the technique > worked for you, great; you've been lucky. Actually I think Boost.Test discusses it but still suggests to build it separately anyway. Discussion==support? I dunno.

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Incompatible with counting iterator?
by Daryle Walker 29 Nov '06

29 Nov '06

When I was adding tests to a bignum class, I ran into a problem with: //======================================================================== std::size_t const biggest = 27u, length = biggest + 1u; boost::counting_iterator<bignum> const cb( 0u ), ce( length ); std::vector<bignum> inputs; inputs.reserve( length ); std::copy( cb, ce, std::back_inserter(inputs) ); //======================================================================== There is a conversion from uintmax_t, but not TO any numeric built-in type. It also has a numeric_limits specialization. This is giving me an error, saying that it wants to convert my type to int, which isn't possible. It seems that my implementation of std::copy exploits random-access iterators, which a counting-iterator usually is, and takes a difference, which uses a difference_type of int, which chokes due to my type not having a suitable conversion. [Looking at the docs....] I guess that I need to change the CategoryOrTraversal and/or Difference parameters to counting_iterator, right? For now, I just have a manual loop: //======================================================================== for ( boost::counting_iterator<bignum> i = cb ; ce != i ; ++i ) { inputs.push_back( *i ); } //======================================================================== -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com

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Re: [boost] New getting started guide
by Sohail Somani 29 Nov '06

29 Nov '06

-----Original Message----- From: boost-bounces(a)lists.boost.org on behalf of Daryle Walker I don't think Boost, are any part of it, should _require_ an install procedure. It should be possible for any user to just take the actual header and source files and use any build system s/he has. ---- Sorry to interrupt but what do you mean here? Any non-trivial library of source code needs to be built. Something sufficiently complex will be tied to a build system. You're not making any sense to me... Are you suggesting that all of boost source should be compiled by #include directives?! I must've missed some context in this discussion.

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Re: [boost] [dynamic_any] multimethods
by Sohail Somani 29 Nov '06

29 Nov '06

> -----Original Message----- > From: boost-bounces(a)lists.boost.org > [mailto:boost-bounces@lists.boost.org] On Behalf Of Alexander Nasonov > Sent: Wednesday, November 29, 2006 12:25 PM > All combinations of 20 types gives 400 variants. It's big > for mpl::vector but I believe modern compilers can process typelists > of this length if a library is carefully crafted. Sounds like real variadic templates would be time better spent no? For the compiler writers that is.

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[dynamic_any] multimethods
by Steven Watanabe 29 Nov '06

29 Nov '06

AMDG Multimethods are unsafe unless a. all combinations are valid b. all the types involved are known at the same time somewhere c. a reasonable default exist when no matching function can be found Variant handles case a. case c is true for comparisons case b can be handled something like this typedef any_tuple<_1, _1, _2, where_<random_access_iterator<_1>, callable<_2, bool(deref_result<_1>, deref_result<_1>)> > > sort_args; void sort_impl(mpl::at<sort_args, _1>::type&, mpl::at<sort_args, _1>::type&, mpl::at<sort_args, _2>::type&); template<class Iter, class F> void sort(Iter begin, Iter end, F f) { sort_args args(begin, end, f); sort_impl(get<0>(args), get<1>(args), get<2>(args)); } Would such a class be useful? Any better ideas for the interface? The big problem is the amount of metaprograming needed. 10 operations were more than msvc 7.1 could handle with my version of dynamic_any::any<> and this is much worse. In Christ, Steven Watanabe

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Re: [boost] using lambda's pointer to member function and, boost::function
by Steven Watanabe 29 Nov '06

29 Nov '06

AMDG "Rodolfo Lima" <rodolfo(a)rodsoft.org> wrote: > > Hi, I'm trying to use boost::function with a functor defined with > boost::lambda that uses a dereference to a pointer to member function, > without success. Here goes what I've done up to now: > <snip> > // This should compile, but doesn't > boost::function<int(const aux &)> fm1 = (&protect(_1)->*&aux::a)(x); > try boost::lambda::bind(&aux::a, _1, x); In Christ, Steven Watanabe

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lambda documentation update
by Rodolfo Lima 29 Nov '06

29 Nov '06

Hi, in the action types table in lambda documentation the action related to member pointer dereference is missing, one should add: ->* other_action<member_pointer_action> to the end of the list. Regards, Rodolfo Lima

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