March 2009 - Boost - lists.preview.boost.org

[random] Speed up binomial and poisson distributions
by Stephan 10 Mar '09

10 Mar '09

Hi, I was wondering why the binomial distribution still isn't optimized for speed. If I look into the GSL as a comparison, they use much smarter and faster algorithms. As is, the bosst::random distributions are not usable for computational purposes to me, which is a pity since I very much like the approach using variate_generators and stuff... I would be happy to contribute some faster code, but I don't know how exactly I should proceed for that... should I contact the maintainer directly? Stephan

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[threadpool] version 22 with default pool
by k-oli＠gmx.de 09 Mar '09

09 Mar '09

I've uploaded a new version of boost-threadpool. changes: * free-function get_default_pool() returning reference to static pool< unbounded_channel< fifo > > * task has new function result() returning the internal shared_future * future-like functions removed from task * boost-threadpool not a header-only library Oliver

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[Asio] Starting/stopping chat_server externally
by Tres Spicher 09 Mar '09

09 Mar '09

Hi all, I am hoping someone who is an expert on Boost.Asio can help me by analyzing my modifications to the chat_server example. I have adjusted the example to closely resemble an application I am developing that uses the example as its inspiration. Important differences between my version and the official version include: 1) chat_room supports clearing the set of participants, and the destructor for participants closes the corresponding socket 2) chat_server supports a start and a stop operation from another thread 3) The io_service is managed by the chat_server object instead of the main function I would like to know if my usage is correct, particularly for the start/stop operations. I would like the stop operation to put the chat_server into the same state it was in on construction, so that the start operation semantics are identical whether the chat_server is newly constructed or has already been stopped. I am concerned about memory leaks or uncaught exceptions, and anything else that a seasoned user of the library would notice that I may have missed. The code can be found here: http://pastie.org/412088 Thanks in advance! Tres -- Tres Spicher Boulder Labs tres(a)boulderlabs.com

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Re: [boost] [Python] GSoC and Python 3.0 Support
by OvermindDL1 09 Mar '09

09 Mar '09

> I'm a student who has finished SWIG's Python 3.0 support in GSoC 2008. > If Boost will participate in this year's Summer of Code, I'd like to > contribute my knowledge of Python 3 migration to Boost.Python, by > implement Python 3.0 support for it. Finally the users of Boost.Python > would get 3.0 support smoothly. Is that worth for a GSoC project? Any > interesting? I would be very pleased if you did this. I had done some minor edits myself, but have no chance for a good half year at least until I could dedicate some time to it, and if you did it then you would both get paid and save me a lot of time. Do note, adding Py3k support also involves changing the python version testing in the build scripts, I already have that part done if I can find it somewhere...

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Can i do serialization on "wchar_t *"
by Selvaraj Kannan 09 Mar '09

09 Mar '09

Hi, I am getting the following error, while compile. I am using Boost 1.32 Version on Mac OS 10.5. --------- > g++ -I/usr/local/include/boost-1_32/ -L/usr/local/lib/ -lboost_wserialization Test.cpp /usr/local/include/boost-1_32/boost/serialization/access.hpp:106: error: request for member 'serialize' in 't', which is of non-class type 'wchar_t' /usr/local/include/boost-1_32/boost/serialization/access.hpp: In static member function 'static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::binary_wiarchive, T = wchar_t]': /usr/local/include/boost-1_32/boost/serialization/serialization.hpp:78: instantiated from 'void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::binary_wiarchive, T = wchar_t]' /usr/local/include/boost-1_32/boost/serialization/serialization.hpp:121: instantiated from 'void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::binary_wiarchive, T = wchar_t]' /usr/local/include/boost-1_32/boost/archive/detail/iserializer.hpp:155: instantiated from 'void boost::archive::detail::iserializer<Archive, T>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const [with Archive = boost::archive::binary_wiarchive, T = wchar_t]' Test.cpp:27: instantiated from here /usr/local/include/boost-1_32/boost/serialization/access.hpp:106: error: request for member 'serialize' in 't', which is of non-class type 'wchar_t' -------- Can someone help me solving this issue. regards S.Kannan

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[uuid] looking for source
by Michael Caisse 09 Mar '09

09 Mar '09

I was looking for the current source for the uuid library. I have found the package used in the last mini-review. Is that the latest? Thank you. michael -- ---------------------------------- Michael Caisse Object Modeling Designs www.objectmodelingdesigns.com

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Re: [boost] [math] Please give me some advice.
by Dongfei Yin 09 Mar '09

09 Mar '09

Hi, I just write some simple example in the main.cpp. now, I have an idea, what about to initialize the variable or assign before the expression. like this, variable<0> x(3.0); double x1 = (x + x * x)(); // x1 == 12 x = 4.0; double x2 = d(x + x * x, x)(); // x2 == 9 from the example, you can see that some of the expression is simplified from the output. that means the result of d(x + x, x) is 2 before running. I don't want to use variable<0>::type to define a variable, so some overload operator is needed. now, I use const_<N>() to define compile time variable, it seems not so convenient. what do you think about it. I will improve it according to your advice. BTW, I think it is easier than existing tools for automatic differentiation, right? Dongfei.

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[filesystem] Normalize
by Konstantin Litvinenko 09 Mar '09

09 Mar '09

Hi All! I have noticed that fs::path("/foo/boo/.").normalize == fs::path("/foo/boo/.") and but I expect fs::path("/foo/boo/.").normalize == fs::path("/foo/boo") without trailing dot. I there is a reason why trailing dot is not removed? Is that paths is not equivalents on some systems?

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wiki.boost.org Ancient
by Joel 09 Mar '09

09 Mar '09

Can wiki.boost.org be redirected to someplace useful? Right now it is an advertisement for crystal clear software. It is a bad advertisement since it is from 2005. Even worse, it has a link to a "boost wiki" that isn't being updated and has spam hidden away in it. It claims not to be official, but if the url is wiki.boost.org, it IS official! Thanks! Joel

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[dynamic_bitset] intersects
by vicente.botet 08 Mar '09

08 Mar '09

Hi, I want to know if two dynamic_bitsets have an element in common. Is there an efficient way to get this? dynamic_bitset<> bs1, bs2; intersetcs(bs1, bs2)? Vicente

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