March 2015 - Boost - lists.preview.boost.org

GSoC 2015 project " Enhanced vector and deque containers "
by ahmad samir 06 Mar '15

06 Mar '15

Good morning I wish to contribute in this project, now I am working on programming competency test. I want to ask about Is there specific or preferable method to show you my work or just upload my code in any online compiler or Github?.

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[random] Quantization effects in generating floating point values
by John Maddock 05 Mar '15

05 Mar '15

First off, I notice there are no examples for generating floating point values in Boost.Random, so maybe what follows is based on a misunderstanding, or maybe not... Lets say I generate values in [0,1] like so: boost::random::mt19937 engine; boost::random::uniform_01<boost::random::mt19937, FPT> d(engine); FPT d = d(); //etc Where FPT is some floating point type. Now my concern is that we're taking a 32-bit random integer and "stretching" it to a floating point type with rather more bits (53 for a double, maybe 113 for a long double, even more in the multi-precision world). So quantization effects will mean that there are many values which can never be generated. It's true that I could use independent_bits_engine to gang together multiple random values and then pass that to uniform_01, however that supposes we have an unsigned integer type available with enough bits. cpp_int from boost.multiprecision would do it, and this does work, but the conversions involved aren't particularly cheap. It occurs to me that an equivalent to independent_bit_engine but for floating point types could be much more efficient - especially in the binary floating point case. So I guess my questions are: Am I worrying unnecessarily? and What is best practice in this area anyway? Thanks, John.

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[build] adding a rquirement for Cygwin only?
by Peter Dimov 05 Mar '15

05 Mar '15

Is it possible to add, for example, <threadapi>pthread to a project's requirements, but only for Cygwin? This works: <toolset>gcc,<target-os>windows:<threadapi>pthread but it also applies to MinGW. This only applies to MinGW: <toolset-gcc:flavor>mingw:<threadapi>pthread but Cygwin has no <flavor>. This: <toolset>gcc,<target-os>windows:<threadapi>pthread <toolset-gcc:flavor>mingw:-<threadapi>pthread doesn't work. There are references to <target-os>cygwin in gcc.jam, but <target-os> is actually 'windows'.

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Call for Papers Meeting C++ 2015
by Jens Weller 05 Mar '15

05 Mar '15

Hello boost community! I'd like to inform you that the call for papers for this years Meeting C++ conference is running! It will end at April 5th, boost related talks are very welcome! This years conference will be again at the Andels Hotel in Berlin, on the 4th and 5th december. It will feature 2 keynotes and 4 Tracks a 7 Talks, this years theme track is "embedded and IoT". There is again also a student program, which will be announced later. Call for Papers: http://meetingcpp.com/index.php/newsreader/items/call-for-papers-for-meetin… Announcement: http://meetingcpp.com/index.php/newsreader/items/announcing-meeting-c-2015.… kind regards, Jens Weller

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GSOC 2015 : Introduction
by roopal nahar 05 Mar '15

05 Mar '15

Hi, I am Roopal, an undergraduate student from IIIT, Hyderabad, India. I would like to express my candidature as an applicant for GSOC, 2015. This is my first time contributing to an open source organization. I have been studying the list of ideas proposed so far and "Boost.uBLAS a library for matrix computations" has caught my attention. Before contacting you, the following is the spade work I have done so far : 1.) The Panda Libraries <http://pandas.pydata.org/pandas-docs/dev/generated/pandas.DataFrame.html> 2.) R package <http://cran.r-project.org/web/packages/data.table/index.html> Apart from the competency test(which I believe, will be submitted at the proposal time), what are your expectations from me and what can I do to prove my seriousness for the candidature before the proposal deadline? I will be joining the IRC channel as soon as my college proxy starts to work(A good time to invest in VPN! :P ) Cheers, Roopal

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GSoc 2015 libraries
by Ágota Horváth 05 Mar '15

05 Mar '15

Hello, I'm Ágota Horváth and I'd like to choose one of the Boost C++ Libraries project this year, because of the language and the interesting projects. However, I haven't really worked with libraries yet, so I'd appreciate if you could tell me how to get started. Thanks, Ágota

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[release 1.58] additional example
by Oliver Kowalke 05 Mar '15

05 Mar '15

Hello, I'd like to add an additional example to boost.context - do I get the permission? best regards, Oliver

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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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