- Boost-users - lists.preview.boost.org

Identify cycles in a undirected graph
by NsPx 20 Aug '13

20 Aug '13

Hi all, I use undirected_dfs to detect all cycles in a undirected graph. I detect a cycle with DFSVisitor.back_edge(e,g) but how can I get the list of vertices defining this cycle ? Thanks by advance

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[log] Retrieving the current trivial severity level
by Chris Stylianou 20 Aug '13

20 Aug '13

Is there any method of retrieve the current severity level from a "boost::log::sources::severity_logger_mt<boost::log::trivial::severity_level>" logger. I would like to store the current severity level in a temporary variable, upgrade it to a new level using "BOOST_LOG_SEV(logger::get(), boost::log::trivial::trace)" to write a trace-type message, and then downgrade the logger back to the previous setting by recalling "BOOST_LOG_SEV(logger::get(), temporaryVariable)" -- View this message in context: http://boost.2283326.n4.nabble.com/log-Retrieving-the-current-trivial-sever… Sent from the Boost - Users mailing list archive at Nabble.com.

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Re: [Boost-users] [rational] numeric_limits not specialized
by Daryle Walker 20 Aug '13

20 Aug '13

Ticket 9017 added: <https://svn.boost.org/trac/boost/ticket/9017>. If you want, you can visit that web page to register yourself to get updates. I’ll try to get at it (and the other reports) in the near-future, after adding some bug reports of my own, and my current project. Daryle W. Sent from Windows Mail From: Michael Olea Sent: ‎Monday‎, ‎August‎ ‎19‎, ‎2013 ‎7‎:‎15‎ ‎PM To: boost-users(a)lists.boost.org Hi. I have some template code that needs slightly different behavior when it is instantiated with exact types like int or boost::rational rather than when it is instantiated with floating point types. The compile-time test depends on std::numeric_limits<T>::is_exact. I was surprised when this came back false for boost::rational until I found that std::numeric_limits<boost::rational<long>>::is_specialized is false. Shouldn't boost::rational specialize numeric_limits? I'm using boost 1.54.0 with clang: Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn) compiling for C++1. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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[thread] Can't compile once.cpp for ppc in 1.54
by James Walker 20 Aug '13

20 Aug '13

Attempting to build the 1.54.0 version of the thread library for ppc on Mac OS X 10.6.8, using Apple's GCC 4.0, I get this error: boost_1_54_0/boost/atomic/detail/gcc-ppc.hpp: In member function 'bool boost::atomics::detail::base_atomic<T, int, 4u, Sign>::compare_exchange_strong(T&, T, boost::memory_order, boost::memory_order) volatile [with T = unsigned int, bool Sign = false]': /Volumes/Home/Mercurial/boost_1_54_0/boost/atomic/detail/gcc-ppc.hpp:1190: error: impossible constraint in 'asm' If I use GCC 4.2, I don't get the error. But I'm hesitant to use that compiler, because it usually produces code that won't run on G3's. -- James W. Walker, Innoventive Software LLC <http://www.frameforge3d.com/>

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[rational] numeric_limits not specialized
by Michael Olea 19 Aug '13

19 Aug '13

Hi. I have some template code that needs slightly different behavior when it is instantiated with exact types like int or boost::rational rather than when it is instantiated with floating point types. The compile-time test depends on std::numeric_limits<T>::is_exact. I was surprised when this came back false for boost::rational until I found that std::numeric_limits<boost::rational<long>>::is_specialized is false. Shouldn't boost::rational specialize numeric_limits? I'm using boost 1.54.0 with clang: Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn) compiling for C++1.

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newbie question about boost and OpenSSL 1.0.1e (boost won't compile with it)
by michael＠skydogsoftware.com 19 Aug '13

19 Aug '13

Hello, I have a Windows C++ application that uses Boost 1_48 and OpenSSL 0.9. I just upgraded to OpenSSL 1.0.1e, and now boost won't compile, e.g. I get the following errors: 14>c:\_ot\svn\ERB\_bin\3rd\include\boost/asio/ssl/impl/context.ipp(411) : error C2039: 'PEM_read_bio_DHparams' : is not a member of '`global namespace'' 14>c:\_ot\svn\ERB\_bin\3rd\include\boost/asio/ssl/impl/context.ipp(411) : error C3861: 'PEM_read_bio_DHparams': identifier not found 14>c:\_ot\svn\ERB\_bin\3rd\include\boost/asio/ssl/impl/context.ipp(421) : error C2039: 'DH_free' : is not a member of '`global namespace'' 14>c:\_ot\svn\ERB\_bin\3rd\include\boost/asio/ssl/impl/context.ipp(421) : error C3861: 'DH_free': identifier not found Will upgrading to the latest version of boost correct this? Thanks in advance for any answers/help/tips. -Michael Compton michael(a)skydogsoftware.com

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[spirit] Parsing the following question
by Michael Powell 19 Aug '13

19 Aug '13

Hello, I would like to parse the following: "{0,0}" with the following constraints: rule<iterator> r %= '{' >> ( int_(0) | int_(1) | int_(2) )[phx::ref(m_mux) = _1] >> ',' >> ( int_(0x29) | int_(0x39) | int_(0x49) )[phx::ref(m_addr) = _1] >> '}'; So that m_mux is capturing either 0, 1, or 2, and m_addr is capturing either 29H, 39H, or 49H (in decimal). Having some difficulty though with the following errors: Description Resource Path Location Type static assertion failed: error_invalid_expression detector line 176, external location: /home/mpowell/srcb/Dchem/SEEKERe/dchem-seekere/tools/installed/boost/include/boost/spirit/home/qi/nonterminal/rule.hpp C/C++ Problem Maybe I don't need the int_ at all? Thank you... Regards, Michael Powell

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Boost 1.54.0: libboost_filesystem-vc110-mt-gd-1_54.lib is missing.
by Amann, Julian 19 Aug '13

19 Aug '13

I build boost 1.54.0 this way (Windows 8 with Visual Studio 2012 x64): b2 address-model=64 toolset=msvc-11.0 --build-type=complete stage --with-filesystem --with-signals --with-system \bootstrap.bat I expect to get a file named 'libboost_filesystem-vc110-mt-gd-1_54.lib' (some boost header file is linking this file via #pragma ...) Unfortunately I get only a 'boost_filesystem-vc110-mt-gd-1_54.lib' and a 'libboost_filesystem-vc110-mt-sgd-1_54.lib' Any idea what I am doing wrong? Best regards, Julian

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[AFIO] AFIO Proposed Feature Voting Announcement
by Paul Kirth 19 Aug '13

19 Aug '13

Hello Boost-dev and Boost-users, I’m Paul Kirth, and I am the student working on the upcoming AFIO library this summer as part of GSoC. As of last week AFIO is fully ported to Boost and is now building cleanly on all of the last three major releases of the three most popular C++ compilers. Niall Douglas, my mentor for AFIO, has previously mentioned on the list that we would be asking for your feedback regarding which new features would be most beneficial to the Boost community. We would like to accommodate you all, but with GSoC being limited in time and ending in just one month’s time now, we’re going to limit the current additions to the top 3 most requested features. I plan to stay involved with AFIO for as long as I am able, so I’m sure many more of these features can be supported by AFIO in the future. I have set up a voting site on https://boostafio.uservoice.com to help with the voting. You may vote 10 times as you see fit, and you can give more (or all!) votes to those features you prefer the most. You may also add additional features not currently up for voting, so we encourage you to read the whole list of proposed additions before adding your own. Try to be descriptive with your feature request including a rationale, as not everyone involved with Boost may have the same expertise as you do. Including an example of how this feature would useful will help make a good case for your feature request, and help voters identify what is important. Finally, if you are not familiar with AFIO, we encourage you to take a look at our documentation at https://ci.nedprod.com/view/All/job/Boost.AFIO%20Build%20Documentation/Boos…. A link is also present on the voting site for your convenience. Additionally you will find our project on github at https://github.com/BoostGSoC/boost.afio, if you wish to dive into the source code for yourself. Voting is open right now, so please be sure to vote before the voting period ends on 8/23/13 at 11:59 PM GMT-8:00. We look forward to seeing which features are most important to the community, and hope to meet your expectations. Quick list of the features already proposed: Directory Monitoring Support Permissions and ACL Support Support for Boost Iostreams Improve Formal Closure Execution Engine Support Asynchronous Directory Enumeration Memory Mapped File Support Support for STL Iostreams Linux Kernel AIO Backend POSIX aio_* Asynchronous I/O Backend -- Paul Kirth (310) 709-2516

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[property_thee] Problem parse xml with boost property_thee
by Neo Apostol 19 Aug '13

19 Aug '13

Hello every one. I have xml the same link this http://pastebin.com/SzxuJq71 and I parse it with boost property_thee. I have got problems with media:thumbnail nodes when I wanted to get attributes width and url. Can anyone help me ? Thanks. -- View this message in context: http://boost.2283326.n4.nabble.com/property-thee-Problem-parse-xml-with-boo… Sent from the Boost - Users mailing list archive at Nabble.com.

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