November 2019 - Boost - lists.boost.org

[review] [STLInterfaces] STLInterfaces review starts December 10
by Barrett Adair 23 Nov '19

23 Nov '19

The Boost formal review of Zach Laine's STLInterfaces library will take place December 10 - 19, 2019. Please consider participating in this review. The success of Boost depends on our robust library review process. STLInterfaces is a C++14 library targeting ISO standardization. The following templates are provided, all C++20-friendly: 1. iterator_interface - a modern version of the iterator_facade and iterator_adaptor parts of Boost.Iterator 2. view_interface - a pre-C++20 implementation of C++20's eponymous feature 3. container_interface - a tool to eliminate boilerplate when writing new containers. Code: https://github.com/tzlaine/stl_interfaces Docs: https://tzlaine.github.io/stl_interfaces/doc/html/index.html Thanks, Barrett Adair

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icl
by Andreas Fislage 22 Nov '19

22 Nov '19

Hello all, I am new here... I recently used icl and ran into a rather surprising behavior: Assertion failed: (numeric_minimum<domain_type, domain_compare, is_numeric<domain_type>::value> ::is_less_than_or(upper(object), is_right_closed(object.bounds())) ), file ...\boost\icl\concept\interval.hpp, line 438 This is the code to produce the problem: #include <boost/icl/discrete_interval.hpp> int main() { boost::icl::discrete_interval<size_t> x{0, 0}; boost::icl::discrete_interval<size_t> y{0, 1}; boost::icl::contains(x, y); } Note that the assertion fails only with size_t not with int. What could be reason for this?

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Boost serialization (bug?) issue with MSVC, with vector<shared_ptr> in several libraries
by Nicolas Guillot 22 Nov '19

22 Nov '19

We use boost serialization in ours projects, both on linux (gcc) and Windows. We encounter a problem only on Windows (for "every" versions of Windows (7 and 10) and of MSVC: Visual 2010 and 2015, ie. MSVC++ 10.0 _MSC_VER == 1600 or MSVC++ 14.0 _MSC_VER == 1900). *Here is the problem summarized*, but I need to give more details after: When I serialize a class - which have base class - and have 2 vector of shared_ptr of ClassB, with the same contents, and B inherits from the same base class the serialization works, but the deserialization doesn't ("input stream error"). The following image is here : https://i.stack.imgur.com/osoiF.png (if it's not displayed) [image: enter image description here] <https://i.stack.imgur.com/osoiF.png> Yes, it's very strange: - if I remove the base class, it works. - if I inline the serialization code (empty function) of the base class, it works. - if the 2 vectors don't have the same content, it works !! - if I register the ClassBase in the serialize method of ClassTest, it works. I.e.: // in ClassTest:template <class Archive>void serialize(Archive & ar, const unsigned int version) { ar.template register_type<ClassBase>(); ...} *Some details* *When it works* on linux, and when it works on Windows with ClassBase type registration in the archive, we have the same xml output. It's worth noting that: - boost_serialization is version 17 on Windows and 9 on linux (I didn't tried to update boost on linux yet). - On BaseClass xml tag, the tracking_level="1", so we have object_id. *And when it doesn't work* (once again: the serialization of ClassTest is OK, but cannot deserialized "input stream error"): - The main difference is in the serialization of ClassTest: the ClassBase part has no tracking_level. - However it's not the only cause, because if the vectors are differents (same 2 first items, and a third item in one vector), tracking_level of ClassBase in ClassTest part is "0". Last thing, if it can give you some clues: while we debugged our application, we noticed that the deserialization framework tries to deserialize a class into another. It makes me think the serialization framework is confused about the classe types identifications. Could it be a matter of dll linking? Of global static shared storage ? I've posted a visual studio solution here <https://1drv.ms/u/s!Aoy4ax0S3ZS5gkxv1UIvRUd32oVO?e=ACVi4c>. Thanks a lot for your help. And if any clarification is needed, I'm available of course !

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[xpressive] Accept one line pull that's been outstanding for a couple years?
by Brian Kuhl 21 Nov '19

21 Nov '19

Hi Boost, We've been running nightly regression on this for years now at Wind River over a couple Boost releases. Any reason it can't be merged? https://github.com/boostorg/xpressive/pull/5 Thanks Brian

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Re: [boost] Jason is getting MARRIED!
by julien.blanc＠tgcm.eu 21 Nov '19

21 Nov '19

"Vinnie Falco" vinnie.falco(a)gmail.com – 21 novembre 2019 15:29 > Yep, the bench program and input files are here: thanks. I'll try to compile it for raspberry pi and report the results here. > > A 200MB file would be a good start to see how the library deals with large files. > > I don't have a 200MB JSON file, and I have doubts that it would > provide much more information than what we have already. I'd also > prefer not to put a 200MB file into the repository. The goal of this > library is to be in the same ballpark as rapidjson, it doesn't try to > be the top performer (in fact, rapidjson achieves its performance by > making usability tradeoffs which are unsuited for vocabulary types). > > However if someone wants to run the bench program on a 200MB file or > any other custom inputs and report the results, that would be great! Just made the test, and the validator performs well (memory consumption is about the size of the file, which i is expected since the whole file is read in memory), while the printer memory usage was huge (i had to stop it, but it was at that time already eating more than 1Gbyte memory, which is not expected). Regards, Julien

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istream_iterator_limited
by Frederick Gotham 21 Nov '19

21 Nov '19

[MODERATOR: I tried to post this a week ago, but for some reason the word SPAM was prefixed to the subject line and so it didn't show up on the GMane server. I don't think many people actually saw it.] - - - - WHY I NEEDED THIS: I wanted to open a file using "ifstream", and then I wanted to read 32 bytes from the file and feed them directly into boost::algorithm::hex. Unfortunately I couldn't do this because 'hex' takes two iterators [begin,end), and there's no alternative function "hex_n". So I had to read the file into a string first, and then pass the string to 'hex'. - - - - THE IDEA I CAME UP WITH: Open the file using "ifstream", and then use a special iterator that will stop reading from the file after 32 bytes, with syntax like this: ifstream logfile("log.txt"); hex( istream_iterator_limited<char>(logfile,32), istream_iterator_limited<char>(), g_some_global_container.begin() ); - - - - SAMPLE CODE: #include <cstddef> /* size_t */ #include <iterator> /* istream_iterator */ template <typename T> class istream_iterator_limited : public std::istream_iterator<T> { protected: std::size_t const m_limit; std::size_t m_current_count; public: /* Shorter names */ typedef std::istream_iterator<T> Base; typedef istream_iterator_limited<T> This; istream_iterator_limited(typename Base::istream_type &obj_stream, size_t const arg_limit) : Base(obj_stream), m_limit(arg_limit), m_current_count (1) { /* The initialiser list above does all the construction work */ } istream_iterator_limited(void) /* This gives the End-Of-Stream iterator */ : Base() , m_limit(0), m_current_count(1) { /* The initialiser list above does all the construction work */ } This &operator++(void) { if ( m_limit <= m_current_count ) { Base::operator=( Base() ); /* Becomes End-Of- Stream iterator */ } else { ++m_current_count; Base::operator++(); } return *this; } }; #include <algorithm> /* copy */ #include <string> /* string */ #include <sstream> /* istringstream */ #include <iostream> /* cout, endl */ #include <iterator> /* back_inserter */ auto main(void) -> int { std::istringstream iss("123456789"); std::string str; /* Let's use copy to read 5 char's into our string */ std::copy( istream_iterator_limited<char>(iss,5), istream_iterator_limited<char>(), std::back_inserter(str) ); std::cout << str << std::endl; str.clear(); /* Get another 3 */ std::copy( istream_iterator_limited<char>(iss,3), istream_iterator_limited<char>(), std::back_inserter(str) ); std::cout << str << std::endl; }

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[release] Boost 1.72.0 Beta 1
by Michael Caisse 21 Nov '19

21 Nov '19

Boost release 1.72.0 beta 1 is now available at: <https://dl.bintray.com/boostorg/beta/1.72.0.beta.1/source/> The SHA256 checksums are as follows: 5a6b5cbd27b8ca0c7741b715e022a3bf05aecbb1e73dc72dd82eef9622374bd5 boost_1_72_0_b1.7z 6c85a7aed198757f5e4be66a971ae90a25c4ce32703fecfb5bb19019bd80947c boost_1_72_0_b1.tar.bz2 be4a3fdaa84d5a8b25863651043308e02645f3fbf772b7623ee6462fb1dbad09 boost_1_72_0_b1.tar.gz 95181a5f3de0078b8fc031f63a4dc8be4d70b7d3d5cde3b266d2cd98bd4b61b0 boost_1_72_0_b1.zip For details of what's in the release, see <https://www.boost.org/users/history/version_1_72_0.html>. Please download the beta, give it a try, and report any problems you encounter. Thanks, -- The Boost Release Team

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[release] Boost 1.72.0 Beta 1 Release Candidate 2
by Marshall Clow 21 Nov '19

21 Nov '19

Boost release 1.72.0 beta 1 rc2 is now available at: <https://dl.bintray.com/boostorg/beta/1.72.0.beta.1.rc2/source/> The release notes are not yet available. The updated documentation is not yet available. [ They will be available in a day or two. ] The SHA256 checksums are as follows: 5a6b5cbd27b8ca0c7741b715e022a3bf05aecbb1e73dc72dd82eef9622374bd5 ./boost_1_72_0_b1_rc2.7z 6c85a7aed198757f5e4be66a971ae90a25c4ce32703fecfb5bb19019bd80947c ./boost_1_72_0_b1_rc2.tar.bz2 be4a3fdaa84d5a8b25863651043308e02645f3fbf772b7623ee6462fb1dbad09 ./boost_1_72_0_b1_rc2.tar.gz 95181a5f3de0078b8fc031f63a4dc8be4d70b7d3d5cde3b266d2cd98bd4b61b0 ./boost_1_72_0_b1_rc2.zip Changes since RC1: * Fix Boost.IOStreams to allow compilation on Mac OS w/LZMA support. Please download the beta release candidate, give it a try, and report any problems you encounter. Thanks, -- The Boost Release Team

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[release] Boost 1.72.0 Beta 1 Release Candidate 1
by Michael Caisse 19 Nov '19

19 Nov '19

Boost release 1.72.0 beta 1 rc1 is now available at: <https://dl.bintray.com/boostorg/beta/1.72.0.beta.1.rc1/source/> The release notes are not yet available. The updated documentation is not yet available. [ They will be available in a day or two. ] The SHA256 checksums are as follows: 3dd80fc3979c312bf892398c35778d821f6744a7fbf76c8248c85b4f3702e4d4 boost_1_72_0_b1_rc1.7z 676e476a2a1246c7c5e8f40230fa70469f29dfe8aaa5bce0a85f94692e605c68 boost_1_72_0_b1_rc1.tar.bz2 e62e5fdffe0772309c77fc9463a95350ebcabb2ce03f2c6ee177123016756044 boost_1_72_0_b1_rc1.tar.gz e3199f3f5046541570fffacd804d736e1999cfac05df6cc054ec97c8098d000d boost_1_72_0_b1_rc1.zip Please download the beta release candidate, give it a try, and report any problems you encounter. Thanks, -- The Boost Release Team

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回复：Re: [release] Boost 1.72.0 Beta 1 Release Candidate 1
by ckgppl_yan＠sina.cn 19 Nov '19

19 Nov '19

I can compile this release in my macOS catalina, 10.15.1. I don't have lama installed in my OS, so I didn't have the issue below.only some warnings out. Thanks Liang----- 原始邮件 ----- 发件人：Marshall Clow via Boost <boost(a)lists.boost.org> 收件人：turkanis(a)coderage.com, Michael Caisse <mcaisse-lists(a)ciere.com> 抄送人：Marshall Clow <mclow.lists(a)gmail.com>, "boost(a)lists.boost.org List" <boost(a)lists.boost.org> 主题：Re: [boost] [release] Boost 1.72.0 Beta 1 Release Candidate 1 日期：2019年11月19日 04点38分 This appears to be https://github.com/boostorg/iostreams/issues/102, and https://github.com/boostorg/iostreams/pull/103 is a suggested fix. -- Marshall On Mon, Nov 18, 2019 at 11:56 AM Marshall Clow <mclow.lists(a)gmail.com> wrote: > On my Mac, I the version of LZMA that I have installed (via homebrew) does > not have the multi-tasking calls (_lzma_cputhreads and > _lzma_stream_encoder_mt). > It identifies itself: > > $ cat junk.cpp > #include <iostream> > #include "lzma.h" > > int main() { > std::cout << LZMA_VERSION << std::endl; > } > > $ clang++ junk.cpp && ./a.out > 50020042 > $ > > Changing libs/iostreams/src/lzma.cpp thus solves enables things to build: > > #ifndef BOOST_IOSTREAMS_LZMA_NO_MULTITHREADED > - #if LZMA_VERSION < 50020002 > + #if LZMA_VERSION <= 50020042 > #define BOOST_IOSTREAMS_LZMA_NO_MULTITHREADED > #endif > #endif > > -- Marshall > _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost

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