September 2021 - Boost - lists.preview.boost.org

Simple boost fix for sparc64
by John Klos 27 Sep '21

27 Sep '21

Hello, boost people, This is a small, simple patch to make boost compile properly on NetBSD/sparc64, at very least, and on SPARC and UltraSPARC in general. Here's a failure example: https://ftp.ziaspace.com/pub/pkgsrc/reports/9.0_2021Q2/sparc64/boost-libs-1… Thanks very much, John Klos --- libs/predef/include/boost/predef/architecture/sparc.h.orig 2021-09-27 16:03:19.965761565 +0000 +++ libs/predef/include/boost/predef/architecture/sparc.h 2021-09-27 16:11:18.084758689 +0000 @@ -34,10 +34,10 @@ #if defined(__sparc__) || defined(__sparc) # undef BOOST_ARCH_SPARC -# if !defined(BOOST_ARCH_SPARC) && (defined(__sparcv9) || defined(__sparc_v9__) +# if !defined(BOOST_ARCH_SPARC) && (defined(__sparcv9) || defined(__sparc_v9__)) # define BOOST_ARCH_SPARC BOOST_VERSION_NUMBER(9,0,0) # endif -# if !defined(BOOST_ARCH_SPARC) && (defined(__sparcv8) || defined(__sparc_v8__) +# if !defined(BOOST_ARCH_SPARC) && (defined(__sparcv8) || defined(__sparc_v8__)) # define BOOST_ARCH_SPARC BOOST_VERSION_NUMBER(8,0,0) # endif # if !defined(BOOST_ARCH_SPARC)

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access violation and data stealing
by rajesh daggumati 27 Sep '21

27 Sep '21

Hi Team, I am preparing a document for boost library(1.76.0) to be used in our organisation. as part of documnet, I need some information. 1.Regarding data integrity and security of gtest and how it interacts with any software. 2.if we use boost, we see any access violation or data stealing? 3.is there any group who supports on cyber security while we are using boost 1.76.0 Please kindly answer above 3 queries. Regards, Raesh D

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please guide me to open source world
by Saurabh Tiwari 23 Sep '21

23 Sep '21

Hai SIR/MAAM this side SAURABH TIWARI currently I am in my 3rd year of Btech I don’t know much about the open source can you please help how to get started for the same I know C++, C, basic data structures and algorithms I would be very thankful if you please help me sir so that I can contribute to this open-source world.

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New to boost
by rajesh daggumati 22 Sep '21

22 Sep '21

Hi Team, in my code,I had to write like below: const int* p = boost::get_error_info<boost::throw_line>(exception); But while building the code,I am facing issue like below: error C2683: 'dynamic_cast':'boost::exception_ptr' is not a polymorphic type.. Then I have added one dummy virtual function in exception_ptr class then this issue got resolved but I am getting some test cases failed at this line: Const int* p = boost::get_error_info<boost::throw_line>(exception); Please help me where will be the issue is.what will be the solution.

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Published various template libraries...
by David Bien 22 Sep '21

22 Sep '21

That I have been working on over the past 23 years (when not working for actual money). Directed Graph Template Library: https://github.com/davidbien/dgraph Original email to boost mailing list from year 2000: https://lists.boost.org/Archives/boost/2000/04/2834.php Lexical Analyzer Generator Template Library: https://github.com/davidbien/lexang Original email to boost mailing list from year 2000: https://lists.boost.org/Archives/boost/2000/04/2837.php This depends on the dgraph git submodule above. The above are written in "old" C++ - but updated to compiler in the latest compilers (MSVC, clang11). Built on the above: XML Parser/Writer/DOM Template Library: https://github.com/davidbien/xmlpinc This I developed over the last winter. It is written in C++20 and requires msvc19 or clang11. I heavily use C++20 concepts. There is a lack of documentation. As well: XML Parser/Writer/DOM Development Environment: https://github.com/davidbien/xmlp This contains the LEX specifications (which are written using overridden C++ operators in a namespace) that produce the state machines for UTF8, UTF16 and UTF32 versions of the XML parser - which are then, upon modification, checked into: https://github.com/davidbien/xmlpinc This as well requires the nearly latest versions of MSVC or clang. Once again: There is a lack of documentation. I don't use boost in these libraries - preferring not to have a dependency on it. I also published: https://github.com/davidbien/bienutil Which contains a lot of stuff from year 2000, but also contains some new stuff which is pretty cool: 1. An actually performant and memory-conservative implementation of a Van Emde Boas Tree: https://github.com/davidbien/bienutil/blob/master/_vebtree.h 2. An "exponential chunked array" (misnamed as "logarray.h") that uses a single piece of memory initially: https://github.com/davidbien/bienutil/blob/master/_logarray.h 3. A bunch of other stuff that I wrote back in 2000 since there wasn't much available back then in terms of C++ utility templates. There is a testbed for the dgraph impl but I haven't yet converted them to CMAKE/googletest. There is also a testbed for the vebtree impl but once again not converted to CMAKE/googletest. (I only have so many fingers). Anyway, I'd like to know what people think. The XML parser is meant to be fully compliant with XML Version 1.0 and meant to be a development environment that can be used to extend to full compatibility. I am currently working on a Parser Generator Template Library (think replacement for yacc or bison) that will work with my LEX replacement and allow use of the LEX terminals in the EBNF for the parser specification (which will again be encoding using C++ overridden operators in a namespace). Sincerely, David Bien

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Please guide me for open source
by Saurabh Tiwari 21 Sep '21

21 Sep '21

Hai SIR/MAAM this side SAURABH TIWARI currently I am in my 3rd year of Btech I don’t know much about open source can you please help how to get started for the same I know C++ ,C, basic data structures and algorithms, html , css (basics), and learning web development. I would be very thankful of you please help me sir so that I can contribute to this open source world.

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[any] [basic_any] This seems like a little pearl in Boost 1.77, but it's a bit underdocumented?
by Viktor Sehr 21 Sep '21

21 Sep '21

I just discovered basic_any which is a very nice addition for me. However it's a bit under-documented for the moment. For example: - I assume it's stack-allocated, does it allocate on the heap if assigned an object larger than the stack (like small_vector) or is this not allowed (like static_vector)? - An idea would also be to add a flag which breaks compilation if an object larger than the OptimizeForSize argument is assigned? - (For detail) If allocated on the stack, are the first bytes of the basic_any the same as the contained object? /Viktor

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[ICL] Proposal to support other set/map implementations
by Martin Duvanel 18 Sep '21

18 Sep '21

Hello, We are using boost::icl::interval_set with very large amounts of intervals, and we are having some performance issues. Profiling showed that, in our use-case, a lot of time was spent on memory allocation/deallocation, and swapping std::set for boost::flat_set made a huge, positive difference. We may have a very specific use-case, but would you consider a small modification to the library inside "boost/icl/impl_config.hpp", in order to open the door for other set/map implementations? Here is the simple change we made to "boost/icl/impl_config.hpp" for this experiment: <code> #if defined(ICL_USE_BOOST_MOVE_IMPLEMENTATION) # define ICL_IMPL_SPACE boost::container #elif defined(ICL_USE_STD_IMPLEMENTATION) # define ICL_IMPL_SPACE std + #elif defined(ICL_USE_CUSTOM_IMPLEMENTATION) + # define ICL_IMPL_SPACE ICL_CUSTOM_IMPL_SPACE #else # define ICL_IMPL_SPACE std #endif </code> And then declaring the following before including: <code> namespace custom_icl { template <class Key, class T, class Compare, class Allocator> using map = boost::container::flat_map<Key, T, Compare, Allocator>; template <class Key, class Compare, class Allocator> using set = boost::container::flat_set<Key, Compare, Allocator>; } // namespace custom_icl #define ICL_USE_CUSTOM_IMPLEMENTATION 1 #define ICL_CUSTOM_IMPL_SPACE custom_icl </code> Would such a change make sense in your opinion? If that's the case, then I would be happy to participate in the contribution. Thank you and best regards, Martin Duvanel

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New contributor in Boost
by RUCHIT RAUSHAN 18 Sep '21

18 Sep '21

Hey there, I am a student of branch Information Technology and currently gaining knowledge in C++. I would love to contribute to the Boost community in every possible way, so I would like to know how to start with it. Thank You! RUCHIT RAUSHAN

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16th Google Summer of Code Participation
by Cem Bassoy 15 Sep '21

15 Sep '21

Since 16 years, the Boost foundation has been selected as a mentor organization by the Google Summer of Code <https://summerofcode.withgoogle.com/> committee. If I am not mistaken, Boost has mentored over 100 students who contributed to existing and experimental boost libraries. This year, 8 students successfully contributed to Boost.Real, Boost.Gil, Boost.Math, Boost.Python, Boost.uBlas, Boost.Multiprecision, see project descriptions <https://summerofcode.withgoogle.com/organizations/6722937052200960/#projects> . Here <https://opensource.googleblog.com/2021/06/google-summer-of-code-2021-studen…> are some stats about GSoC21. I would like to thank all students for their contribution and all mentors who have made this possible. Keep up the good work! All the best, Cem

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