March 2015 - Boost - lists.boost.org

New to open source
by Brian Wood 04 Mar '15

04 Mar '15

Pranjal Rai writes: > Hi, > I am new to open source and would like to contribute to it. > Can someone please guide me what to do next? Hi, Pranjal, I have an archive of serialization and messaging code available here: http://webEbenezer.net/build_integration.html . My software has serialization support for some Boost types and I'm open to adding support for more Boost types. That is one way I contribute to Boost. -- Brian Ebenezer Enterprises - In G-d we trust. http://webEbenezer.net

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New to the List?
by Rob Stewart 04 Mar '15

04 Mar '15

It seems that each newcomer to this mailing list manages to sign up without reading about our policies[1]. If you're one of them, please read them, paying particular attention to [2] and [3], before your next post. [1] http://www.boost.org/community/policy.html [2] http://www.boost.org/community/policy.html#subject-line [3] http://www.boost.org/community/policy.html#quoting ___ Rob (Sent from my portable computation engine)

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boost.ublas gsoc 2015
by Dhruv Kohli 04 Mar '15

04 Mar '15

Hello, I am Dhruv, majoring in Mathematics & Computing from Indian Institute of Technology, Guwahati. After doing a bit of research over the project ideas, I found the idea of further developing boost.ublas library interesting and have started writing the programming competency code. Here is the link to the code I've written yet: https://github.com/chiggum/boost.ublas/blob/master/gaussian_elimination.hpp. Though the code is not yet complete, but a naive version of algorithm is implemented and is integrated into ublas. To me, the code seems to be running properly. I need a little help to proceed further. 1. Can someone please direct me to some code snippet that shows how the error handling code is written in boost library. To be specific, the gaussian elimination doesn't work on singular matrices. So, I would like to set the errno and display appropriate message to the user whenever a singular matrix is given as an input. 2. What sort of test code is required? Do we need to have a test case with hard-coded output to be checked against the results obtained when the test case is passed to the algo. Or there's some other predefined format for testing codes in boost library. Sorry, I haven't yet gone through most of the code in boost library. Any further helpful links/resources are welcomed. Thanks & Best regards, Dhruv https://github.com/chiggum

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An invalid XML character (Unicode: 0x8) problem because of property_tree::xml_parser::write_xml
by Rohan Shetty 04 Mar '15

04 Mar '15

Hi, I have used the following C++ code to generate the xml boost::property_tree::ptree ptResponse; // Populate the tree from the Microsoft Outlook contactsstd::stringstream buf; const std::string enc("utf-8"); boost::property_tree::xml_writer_settings<char> settings(' ', 0, enc); boost::property_tree::xml_parser::write_xml(buf, ptResponse, settings); This works fine. But in one of the customer's machine, when reading the this(xml content) in a JAVA program. I get the following error An invalid XML character (Unicode: 0x8) was found in the element content of the document. Any help in solving this is appreciated. Regards,Rohan

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[foreach] Errors using foreach
by Edward Diener 04 Mar '15

04 Mar '15

When trying to use the foreach library, whether running it tests or trying to build quickbook which uses the foreach macro, I am seeing from different compilers: gcc-4.9.2 > In file included from stl_byval.cpp:15:0: > ./utility.hpp: In function 'bool sequence_equal_byval_n(foreach_container_type&, const char*)': > ..\..\../boost/foreach.hpp:906:96: error: no matching function for call to 'encode_type(foreach_container_type&, boost::is_const<std::list<int> >*)' > (true ? 0 : boost::foreach_detail_::encode_type(COL, boost::foreach_detail_::is_const_(COL))) > ^ > ..\..\../boost/foreach.hpp:1013:9: note: in expansion of macro 'BOOST_FOREACH_TYPEOF' > , BOOST_FOREACH_TYPEOF(COL) \ > ^ > ..\..\../boost/foreach.hpp:1095:77: note: in expansion of macro 'BOOST_FOREACH_BEGIN' > if (boost::foreach_detail_::auto_any_t BOOST_FOREACH_ID(_foreach_cur) = BOOST_FOREACH_BEGIN(COL)) {} else \ > ^ > ./utility.hpp:20:5: note: in expansion of macro 'BOOST_FOREACH' > BOOST_FOREACH( foreach_value_type i, rng ) > ^ clang > In file included from stl_byval.cpp:25: > ././utility.hpp:20:5: error: no matching function for call to 'encode_type' > BOOST_FOREACH( foreach_value_type i, rng ) > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > ..\..\..\boost/foreach.hpp:1095:77: note: expanded from macro 'BOOST_FOREACH' > if (boost::foreach_detail_::auto_any_t BOOST_FOREACH_ID(_foreach_cur) = BOOST_FOREACH_BEGIN(COL)) {} else \ > ^~~~~~~~~~~~~~~~~~~~~~~~ > ..\..\..\boost/foreach.hpp:1013:9: note: expanded from macro 'BOOST_FOREACH_BEGIN' > , BOOST_FOREACH_TYPEOF(COL) \ > ^~~~~~~~~~~~~~~~~~~~~~~~~ > ..\..\..\boost/foreach.hpp:906:17: note: expanded from macro 'BOOST_FOREACH_TYPEOF' > (true ? 0 : boost::foreach_detail_::encode_type(COL, boost::foreach_detail_::is_const_(COL))) > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > ..\..\..\boost/foreach.hpp:401:22: note: candidate function [with T = std::list<int, std::allocator<int> >] not viable: no known conversion from 'boost::is_const<list<int, allocator<int> > > *' to 'boost::mpl::false_ *' (aka 'bool_<false> *') for 2nd argument > inline type2type<T> *encode_type(T &, boost::mpl::false_ *) { return 0; } > ^ > ..\..\..\boost/foreach.hpp:404:30: note: candidate function [with T = std::list<int, std::allocator<int> >] not viable: no known conversion from 'boost::is_const<list<int, allocator<int> > > *' to 'boost::mpl::true_ *' (aka 'bool_<true> *') for 2nd argument > inline type2type<T, const_> *encode_type(T const &, boost::mpl::true_ *) { return 0; } > ^ > In file included from stl_byval.cpp:25: > ././utility.hpp:20:5: error: no matching function for call to 'encode_type' > BOOST_FOREACH( foreach_value_type i, rng ) > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Does anybody know what is causing this error ? I can't seem to proceed in building documentation with quickbook until I can get foreach working. I pulled the latest foreach from the master branch and ran b2 headers but still the problem occurs.

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New to open source
by Pranjal Rai 03 Mar '15

03 Mar '15

Hi, I am new to open source and would like to contribute to it. Can someone please guide me what to do next? Pranjal Rai

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[gsoc15] Queries about enhancement of vector and deque containers
by Sandilya Jandhyala 03 Mar '15

03 Mar '15

Hello Boost, My name is Sandilya Jandhyala. I'm a third year undergraduate student pursuing Computer Science and Engineering at Amrita School of Engineering, Bangalore, India. I'm interested in submitting a proposal based on this idea. I have a few queries: 1. The programming test is to 'write a small vector-like container'. But this is somewhat vague, since it's not clear what is meant by 'small'. Does this mean that I only have to implement a subset of the functionality/member functions of std::vector? If so, which subset? How do I pick and choose? Or do I need to implement all the member functions? It would be helpful if some expected functionality were specified. 2. The entry on the ideas page hasn't specified how to submit the programming test. I'm assuming that I should copy and paste my code into the end of my proposal, as is specified for the other ideas. Is that correct? 3. The test requires that push_back throws when the buffer is full. But does this mean that the capacity is fixed? Can the capacity be increased when elements are added using other methods like insert()? 4. Though I'm comfortable with C++, I'm not at all familiar with unit testing or documentation tools. I'm willing to learn though. I've found that there are a large number of unit testing frameworks available for C++, and it's difficult to choose. Would you recommend any framework over another for this project/programming test? 5. I would like to begin researching possible improvements/additions to the vector and deque classes. What would be a good place to start? Should I look at the standard libraries of other languages? Could you point me to some resources I could study? Thank you for reading my queries. Any other tips/suggestions would be greatly appreciated.

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[gsoc15] Boost will be a mentoring org for 2015
by Niall Douglas 03 Mar '15

03 Mar '15

Dear Boost. I am very pleased to report that Boost has been accepted as a GSoC org for 2015. Student applications begin on Monday March 16th, in just under two weeks, and last ten days until Friday March 27th. If you haven't added your proposal ideas to https://svn.boost.org/trac/boost/wiki/SoC2015, now is the time to do so. If you would like to add your name to the ten other mentors who have made themselves available this summer, please do get in contact. Niall and Boris --- Boost C++ Libraries Google Summer of Code 2015 admin https://svn.boost.org/trac/boost/wiki/SoC2015

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GSOC 2015 guideline
by Vaneet yadav 03 Mar '15

03 Mar '15

hi all, I am Vaneet singh yadav student of IIT Guwahati (INDIA) , i am interested in working Boost.uBLAS a library for matrix computations in GSOC 2015 .can any help me how to start thanks a lot

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GSoC 2015
by Ágota Horváth 03 Mar '15

03 Mar '15

Hello, I'm Ágota Horváth from Hungary, a second year BSc student. I'm learning computer engineering and I'm really interested in choosing one of Boost C++ Libraries projects this year. Especially, I'd like to participate in the Enhanced vector and deque containers project because I have learned C++ at the university and I'd like to extend my knoledge about libraries and it would be a great experience to me if I could do that while working on a real project. However, this is the first year when I'd like to take part is GSoC, so I don't really know who I should turn to in order to get more information about this project, the proposal and how to get in touch with my would-be mentor. I'd also like to know what skills are needed for this project so that I can prepare before the coding starts. I would really appreciate if you could help me with that. Thank you, Ágota Horváth

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