February 2019 - Boost - lists.preview.boost.org

Graph Algorithms
by Siddhartha Sen 24 Feb '19

24 Feb '19

Is there any interest in a library containing graph algorithms? Also, I am unable to find the list of maintainers of the respective libraries. Any information on that would be appreciated.

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add serialization to circular_buffer
by Yuval Lifshitz 24 Feb '19

24 Feb '19

Dear Community,I have a PR [1] for supporting serialization of the circular_buffer. Main drive for this change, is my effort for adding serialization to boost accumulators [2] (some accumulators hold data internally in a circular buffer).The maintainers list [3] is not up to date regarding circular buffer, so, I'm not sure who the maintainer is (or if there is one). Would appreciate your help, so I can drive that to completion. Yuval Lifshitz [1] https://github.com/boostorg/circular_buffer/pull/25[2] https://github.com/boostorg/accumulators/pull/18 [3] https://github.com/boostorg/boost/blob/master/libs/maintainers.txt

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BGL
by Siddhartha Sen 22 Feb '19

22 Feb '19

I looked up https://github.com/boostorg/boost/wiki/Google-Summer-of-Code:-2019 . No project ideas have been added for BGL as of yet, it seems. I hope there is something in BGL in this years GSOC, as I am really passionate about graphs and graph algorithms. Also, will you be mentoring this year? If not, do you have any information on the potential mentors for this BGL project? Thanks.

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Re: [boost] Graph Algorithms
by Siddhartha Sen 22 Feb '19

22 Feb '19

Thanks for the feedback! But what if I focus on C++14 then? Is that a good idea? On Fri, 22 Feb, 2019, 6:14 PM Vinnie Falco, <vinnie.falco(a)gmail.com> wrote: > On Fri, Feb 22, 2019 at 12:49 AM Siddhartha Sen > <siddhartha99.sen(a)gmail.com> wrote: > > From what I've read in the mailing lists, I think the demand has > shifted > > from C++11 to more modern versions, like C++14 and C++17. Anyways, > > thanks for the tip. Will you be mentoring this year? > > I will not be mentoring directly although I do offer advice on the mailing > list. > > People say they want C++14 and C++17 but I don't think its a good idea > to require those language versions in a library, because most people > are still on C++11. Have a look at the latest developer survey: > > <https://www.jetbrains.com/research/devecosystem-2018/cpp/> > > If a library requires C++17 then most C++ users will not be able to > use it. And this is bad for the library, because fewer users means > less testing, less feedback, less popularity, and in general this > makes the library not as good. > > In terms of the API (interface) of a library, C++17 does not offer > much more than C++11 except for things like, avalability of > string_view, variant. But Boost has these things already (e.g. > boost::string_view, boost::variant) and they work in C++11. So there > is really no benefit to C++17 other than some improvements in the way > you can write the implementation. But that doesn't affect users > directly. > > In summary, by requiring C++17 most users will be unable to use the > code, and there will be very little benefit to C++17 users. > > Regards >

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BGL
by Siddhartha Sen 22 Feb '19

22 Feb '19

I apologise. Actually, there was a suggestion in the boost mailing lists that there is a demand for this. Anyways, I am familiar with C++14 and a C++17 as well(a bit). Will you be mentoring this year? I have already read the documentation of LEMON and started using it as well. Please let me know what should I do next, or if there are any particular issues you would like me to work on. Thanks. Regards. Siddhartha.

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BGL: Graph11
by Siddhartha Sen 22 Feb '19

22 Feb '19

Hi, I am SIddhartha Sen, a second year student in Information Science and Engineering. I hope to contribute to the BGL. I have heard that there is some interest in themodernization of BGL using modern C++11 concepts for improved performance. Being a GSOC 2019 aspirant, I was looking for a potential mentor in this domain to pair up with and get started on this project. Any help would be greatly appreciated. Thank You.

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PR not merged
by Sreejith S 21 Feb '19

21 Feb '19

I have sent a PR[1]. Can I know why the PR is still not merged ? [1]:https://github.com/boostorg/graph/pull/158 -- Regards, Sreejith.S Amrita Vishwa Vidyapeetham FOSS@Amrita <http://amfoss.in> | Github <https://github.com/sreejithsankar55> | Blog <http://sreejithsankar.wordpress.com>

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Re: [boost] [build] PROBLEM specifying libc++!!!!
by Nikita Kniazev 21 Feb '19

21 Feb '19

> Anyone know how to do this and have the will to make life easier for > poor overworked library maintainers? I have `b2 <stdlib>libc++` on CI for Spirit with https://github.com/boostorg/spirit/blob/develop/.travis.yml#L119-L121 When I tried to make a PR I stuck at the thing that I do not know how (or it is not possible) to format (free-)future value into some flags, i.e: > toolset.flags clang-linux.compile OPTIONS <stdlib> : -stdlib=[ value-of-feature <stdlib> ] ; > toolset.flags clang-linux.link OPTIONS <stdlib> : -stdlib=[ value-of-feature <stdlib> ] ; But since in the wild there are two possible options it might be ok to just hardcode them for now.

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[GIL] Contribution to the library.
by Gaurav Hoskote 21 Feb '19

21 Feb '19

This is to inform the concerned authority that I am willing to participate in GSOC 2019 and wish to contribute to the GIL library. I am a final year student and have good understanding of operations like Thresholding, Morphology and various filters. I have an idea of how the library works and I wish to contribute to it under the guidance of a mentor.

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Image Processing for [GIL] Boost.
by Gaurav Hoskote 21 Feb '19

21 Feb '19

The Boost GIL library lacks image processing header files for operations like thresholding, morphology etc. I intend to contribute to this library by proposing some header files that can be placed in this library. I have worked on image processing algorithms before and am familiar with all the concepts.I wish to work under the mentorship of Stefan Seefeld who posted this project on github for GSOC 2019. I have attached a proposal pdf file (gilpro.pdf) to this email which gives details about my work and how the project will be implemented along with goals and milestones to be achieved. Also, for competency test I have attached a sample header file (threshold.h) which gives a basic idea of what I wish to implement for my project. Feedback would be appreciated. Regards, Gaurav Hoskote.

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[build] PROBLEM specifying libc++!!!!
by Vinnie Falco 21 Feb '19

21 Feb '19

This is hard to teach, hard to remember, and error prone: script: b2 -j3 libs/beast/test toolset=clang cxxstd=11 cxxflags=-stdlib=libc++ linkflags=-stdlib=libc++ There's an issue to address it in a straightforward fashion: <https://github.com/boostorg/build/issues/287> Anyone know how to do this and have the will to make life easier for poor overworked library maintainers? Regards

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[GSoC 2019] cpp_int Improvement
by Fenil Mehta 20 Feb '19

20 Feb '19

Hi, Integers with the capability to store large numbers has always been a requirement in C++ which has successfully been implemented by boost/multiprecision/cpp_int. Other languages such as Python and Java also supports such integer datatypes. I performed a speed test for C++ and python integers. While comparing speed of cpp_int and python int, I noticed that even though C++ source program was compiled with -O2 and -O3 flags, cpp_int was slow as compared for python int for multiplication and left-shift operations. The time taken for multiplication was: 1) cpp_int = 17.06 seconds 2) python int = 8.39 seconds I used the attached files to perform the testing on Linux. The execution time was measured using the time command. I would like to optimize this library. Being a GSoC aspirant, I was looking to pair up with a potential mentor in this domain who could guide me. Any feedback would be appreciated. Regards, Fenil Mehta

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[asio] windows compilation error
by Vinnie Falco 19 Feb '19

19 Feb '19

This program fails to compile under msvc.latest: #include <boost/asio.hpp> int main { return 0; } This program does compile: #define BOOST_ASIO_DISABLE_WINDOWS_RANDOM_ACCESS_HANDLE 1 #define BOOST_ASIO_DISABLE_WINDOWS_STREAM_HANDLE 1 #include <boost/asio.hpp> int main { return 0; } Thanks

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Integer sorting
by Fenil Mehta 19 Feb '19

19 Feb '19

I have written a sorting algorithm which is way faster than std::sort for all array size. The link is as follows: https://github.com/fenilgmehta/Fastest-Integer-Sort Some guidance would be appreciated on how to improve the project structure and the steps to get it included in boost. Regards, Fenil Mehta

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Regression tests broken
by Tom Kent 19 Feb '19

19 Feb '19

All- Sometime around 7pm yesterday (2-17) a commit went in (master and develop?, regression scripts?) that broke all my regression runners (linux and windows). I haven't had a ton of time to dig in, but the end of the results look like this: notice: using boost library auto_config <layout>system ../libs/contract/test/Jamfile.v2:417: Unescaped special character in argument <define>BOOST_CONTRACT_ON_MISSING_CHECK_DECL="{ throw err(); }" notice: [libjpeg] Using pre-installed library notice: [libjpeg] Condition notice: [zlib] zlib is already configured notice: [libpng] Using pre-installed library notice: [libpng] Condition notice: [libtiff] Using pre-installed library notice: [libtiff] Condition /var/boost/run/boost_bb/src/build/feature.jam:447: in extend-feature from module feature error: coverage is already associated with the "<variant>" feature /var/boost/run/boost_bb/src/build/feature.jam:624: in feature.extend from module feature /var/boost/run/boost_bb/src/tools/features/variant-feature.jam:79: in variant from module variant-feature ../libs/histogram/Jamfile:15: in modules.load from module Jamfile</var/boost/run/boost_root/libs/histogram> /var/boost/run/boost_bb/src/build/project.jam:372: in load-jamfile from module project /var/boost/run/boost_bb/src/build/project.jam:64: in load from module project /var/boost/run/boost_bb/src/build/project.jam:109: in load-parent from module project /var/boost/run/boost_bb/src/build/project.jam:513: in initialize from module project /var/boost/run/boost_bb/src/build/project.jam:348: in load-jamfile from module project /var/boost/run/boost_bb/src/build/project.jam:64: in load from module project /var/boost/run/boost_bb/src/build/project.jam:142: in project.find from module project Jamfile.v2:122: in run-tests from module Jamfile</var/boost/run/boost_root/status> Jamfile.v2:196: in modules.load from module Jamfile</var/boost/run/boost_root/status> /var/boost/run/boost_bb/src/build/project.jam:372: in load-jamfile from module project /var/boost/run/boost_bb/src/build/project.jam:64: in load from module project /var/boost/run/boost_bb/src/build/project.jam:142: in project.find from module project /var/boost/run/boost_bb/src/build-system.jam:618: in load from module build-system /var/boost/run/boost_bb/src/kernel/modules.jam:295: in import from module modules /var/boost/run/boost_bb/src/kernel/bootstrap.jam:139: in boost-build from module /var/boost/run/boost_root/boost-build.jam:17: in module scope from module Any thoughts? Tom

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[Asio][ssl] develop broken
by Damian Jarek 18 Feb '19

18 Feb '19

After the changes today (introduced in https://github.com/boostorg/asio/commit/0568d3bf0b492887c6c48d05f5492a782da… ) an overload of async_handshake( https://github.com/boostorg/asio/blob/develop/include/boost/asio/ssl/stream…) fails to compile because of the signature mismatch in async_result. This is a show-stopper, because it breaks quite a bit of code in Beast.

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Searching and Sorting algorithms
by Siddhartha Sen 18 Feb '19

18 Feb '19

Sorry for the typo. I meant "generic", not genetic. Anyways, I went through the non-mutating algorithms section and can't think of anything to possibly add. I had three questions though: 1. Is there any interest in libraries aimed at solving any small but particular problem, for example, say tower of hanoi in minimum possible time? 2. For any existing algorithm, if we add some features would it be useful? For example, as far as I know, binary search returns true if an element is found and false, if not. What if we add the elements position if found? Does not change complexity, but makes it better to use,doesn't it? 3. I want to contribute to the sorting algorithms library as well, any idea where to start? Is there any scope for improvement of any existing algorithms? Also, if we want to add any entirely new algorithms of our own, any suggestions where to start? I am working on an algorithm currently and was hoping to propose it to the boost libraries. Sorry if my post got too lengthy. Any help would be appreciated. Thank You.

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[Asio] develop broken on Windows
by Vinnie Falco 18 Feb '19

18 Feb '19

This program fails to compile on Windows: #include <boost/asio.hpp> int main() { return 0; } Regards

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Searching Algorithm
by Siddhartha Sen 17 Feb '19

17 Feb '19

Looking to contribute to the sorting library under algorithms. Any mentors available? Also, is their any interest in searching algorithms? I looked up the boost libraries but couldn't find any. Are there any mentors available? I want to make a searching library which will be genetic in nature and applicable for all data types. Any guidance would be appreciated. Thanks. Siddhartha

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building, debugging and contributing to an individual boost library
by Sean Farrow 17 Feb '19

17 Feb '19

Hi, Once I have forked an individual boost library, what is the best way of building the library with b2? How are dependencies on other libraries handled? Secondly, how can I build, run and debug tests using visual studio? Any help appreciated. Kind regards Sean.

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New user need guidance.
by SHREYANS JAIN 17 Feb '19

17 Feb '19

Hi I am Shreyans Jain. I am new to opensource programming, can anyone guide me how to start contributing here. Thank You

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Re: [boost] Mail list is poorly indexed by Google
by Nikita Kniazev 15 Feb '19

15 Feb '19

> > Indeed! Google stopped indexing January 2017. Strange, I linked mid-December thread, if crawlers stopped indexing in January there was more than two weeks to index it, is not it?

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String Algorithms
by Siddhartha Sen 14 Feb '19

14 Feb '19

Hi, I would like to contribute to the string algorithms library for GSOC 2019. Are there any potential mentors to pair up with? I am also interested in algorithms in general, especially sorting and searching libraries. Is there any scope for contribution there as well? Any answers would be appreciated

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Mail list is poorly indexed by Google
by Nikita Kniazev 13 Feb '19

13 Feb '19

I was going to find the https://lists.boost.org/Archives/boost/2018/12/244648.php thread, but it did not worked with Google (looked all the pages <https://www.google.com/search?q=dropping+support+for+msvc+9+site%3Alists.bo…>), while DuckDuckGo shows it as the first link <https://ddg.gg/?q=dropping+support+for+msvc+9+site%3Alists.boost.org>. Can webmasters look into this with the Google's Search Console <https://search.google.com/search-console/about>? Or it is a policy to supplant the all-embracing Google? :-)

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Regarding Boost.Real
by Sreejith S 13 Feb '19

13 Feb '19

Hi all I am Sreejith, a sophomore at Amrita University. I had gone through GSoC projects and I found Bringing Boost.Real to review-ready state interesting. As a beginner, I tried to understand the blog post of previous year's GSoC-18 project of the same. It seemed too difficult for me. Is it ok to work on it without any experience? -- Regards, Sreejith.S Amrita Vishwa Vidyapeetham FOSS@Amrita <http://amfoss.in> | Github <https://github.com/sreejithsankar55> | Blog <http://sreejithsankar.wordpress.com>

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