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[fusion][mpl][array] making boost array a conforming mpl sequence (through fusion)
by Stjepan Rajko 14 Feb '09

14 Feb '09

Hi, I tried to make boost::array a conforming MPL sequence by including: #include <boost/fusion/adapted/array.hpp> // makes array a conforming fusion sequence #include <boost/fusion/mpl.hpp> // makes fusion sequences conforming MPL sequences but, typedef boost::array<int, 1> array; assert(boost::mpl::is_sequence<array>::type::value); // fails Am I misinterpreting the fusion documentation in expecting that this should work? Is there another way of making boost::array an mpl sequence? TIA, Stjepan

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Re: [Boost-users] [boost] [log][mpi]Review-ready version in the Vault
by jesseperla＠gmail.com 14 Feb '09

14 Feb '09

Hi guys, I am excited to use this library for logging. The design looks excellent. I am not competent enough to do a sanity check on the extensibility, but can anyone else see if the design would allow backends/attributes/etc. for MPE (maybe could be added to boost::MPI) Here is a simple tutorial: http://beige.ucs.indiana.edu/I590/node112.html -Jesse

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[boost-users][functiontypes]
by Germán Diago 14 Feb '09

14 Feb '09

Hello. I'm using boost.functiontypes and I would like if it's possible to extract information of arity and argument types from bind expressions and boost.functions. Thank you.

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[accumulator] Computing deviation
by dhruva 14 Feb '09

14 Feb '09

Hello, I would like to know if there is any direct way to compute standard deviation using accumulators or do I have to implement something using other building blocks from accumulators. -dhruva Add more friends to your messenger and enjoy! Go to http://messenger.yahoo.com/invite/

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SUN Studio errors in version 1.38
by Roman Morokutti 13 Feb '09

13 Feb '09

Hi, I am encountering build errors with SUNWspro. Mainly "array.hpp" causes the errors. Here is the outline: "./boost/array.hpp", line 75: Error: Too few arguments for template std::reverse_iterator<boost::T*>. "./boost/array.hpp", line 289: Where: While specializing "boost::array<boost::T, boost::N>". "./boost/array.hpp", line 289: Where: Specialized in non-template code. "./boost/array.hpp", line 76: Error: Too few arguments for template std::reverse_iterator<const boost::T*>. "./boost/array.hpp", line 289: Where: While specializing "boost::array<boost::T, boost::N>". "./boost/array.hpp", line 289: Where: Specialized in non-template code. 2 Error(s) detected. I would be happy if the responsible engeneer could solve this problem with Sun Studio. For further information the version I use is the latest Express version from November. Regards Roman

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[serialization] text_oarchive problem
by Greg Ravikovich 13 Feb '09

13 Feb '09

Hello all, I'm using boost 1.37 on msvc 9. I have a compilation problem when serializing to a text_oarchive. The problem doesn't happen when serializing to a binary_oarchive. here's a sample code: #include <boost/test/unit_test.hpp> #include <boost/serialization/serialization.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/serialization/tracking.hpp> struct SerializableStruct { int m_data; }; namespace boost { namespace serialization { template<class Archive> void serialize(Archive & ar, SerializableStruct & s, unsigned int ) { ar & s.m_data; } } } BOOST_CLASS_TRACKING(SerializableStruct,boost::serialization::track_never); BOOST_AUTO_TEST_SUITE(TestGeneralSerialize) BOOST_AUTO_TEST_CASE(TestTextArchive) { boost::archive::text_oarchive out(std::cout); SerializableStruct s; s.m_data = 10; out << s; } BOOST_AUTO_TEST_CASE(TestBinaryArchive) { std::stringstream str; boost::archive::binary_oarchive out(str); SerializableStruct s; s.m_data = 10; out << s; } BOOST_AUTO_TEST_SUITE_END(); By the way, the following code compiles fine under boost 1.35 and fails to compile under boost 1.36, 1.37. Comment out the TestTextArchive and the code compiles fine. Any help will be appreciated. Greg

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Nautical miles and boost::units
by Esben Mose Hansen 13 Feb '09

13 Feb '09

Hi, What sort of magic do I have to write to get this sort of thing to work? === typedef boost::units::quantity<boost::units::si::length> length_t; length_t earth_radius = 3438.461 * nautical_mile; === boost::units defines a boost::units::metric::nautical_mile_base_unit in terms of meters, so the numbers and concepts are in the library already. Somehow. Thanks for any help :) -- kind regards, Esben

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[BGL] Properties in a set-based adjacency list
by Grzegorz Slodkowicz 13 Feb '09

13 Feb '09

Hello, How can I use an external property map with an adjacency list which uses a setS for the vertex list? I got property maps (with arrays as storage for the property values) working fine with a vecS adjacency list, but I can't seem to get them to work after changing the template to setS. I understand the reason is lack of automatic indexing, but don't know how to get around that. Using set/map for storage of property values would most convenient for me. On a similar note, perhaps it's possible to use a map to store the vertices, mapping ints to Vertex descriptors? (that was the original custom implementation of graph class which I'm porting to BGL). TIA, Greg

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asio::transfer_at_least strange behavior
by Timenkov Yuri 13 Feb '09

13 Feb '09

Hi Is transfer_at_least supposed to return success only if requested number of bytes transferred at once or at all? For example, I want to receive 800 bytes and put them into streambuf using transfer_at_least(800) as completion condition, but I receive 2 chunks of 400 bytes, therefore I never get a success, because transfer_at_least_t always wants more data. I know, there are may be some problems with handler copying, but the name of function is misleading, and may be should be documented. I'm using boost 1.37, may be something has changed in 1.38.

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compiling Boost with STLport
by Kevin Li 13 Feb '09

13 Feb '09

Hi, I have a question about compiling Boost 1.38.0 with STLport. According to the document of Boost.Build, we can do following things: (1)modifying user-config.jam to point directories about STLport; (2)adding stdlib=stlport to bjam command; Using this method,We can compile Boost 1.38.0 with STLport supported. There is a 'p' in the libraries' name. But, I had a problem today. I recompiled Boost without STLport and checked there isn't a 'p' in libraries' name. When I compiled my program there is a error: can't link to stlport.5.2.lib At the end, I took off STLport's path from $INCLUDE_PATH (at the first) and compiled Boost again. Then I compiled my program successful. So, I think if we put STLport's path to the first of $INCLUDE_PATH when compiling Boost. It will links STLport too, but there is a 'p' in the libraries' name. I need your help. PS: I use MSVC 8.0 on Windows XP. Sincerely -------------- Kevin Li 2009-02-13

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