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[GSoC 14] Request community to rank proposals
by Niall Douglas 24 Mar '14

24 Mar '14

Dear Boost Community, The Google Summer of Code 2014 proposals for Boost are in, and we would deeply appreciate the community's help in ranking the proposals according to merit before the 1st of April. To vote, the process is easy: 1. Go to this page https://www.google-melange.com/gsoc/homepage/google/gsoc2014 and click the "Log in" button under Mentors and Administrators. 2. Now click "Create Profile" on the same page. Note that even if you registered last year, you must register again in 2014. Fill in the form. Note that after submitting it drops you at "Edit Profile", which is confusing. 3. Click "My Dashboard", then "Connect with organisations". 4. Choose "Boost C++ Libraries". 5. In the message box, write this: "I am a member of the Boost community and the email(s) I normally post to boost mailing lists with is <email>" filling in the email address(es) you normally use to post to boost mailing lists. This lets us verify that you are indeed a long standing member of the Boost community. 6. Once we approve your request, you will get an email with the subject "Welcome as organisation member". You can now return to the Dashboard on the GSoC website where there will be a new item "Proposals". 7. Work your way through as many of the 42 proposals as you can. You can score them using the stars at the bottom of each proposal page, taking care to read any comments by the mentors and students if present. PLEASE try to rank some of the lowest scored proposals, every year we get a lot of people who only rank the top five and don't bother with the rest. Try to score on the basis of (i) proposal quality and your best estimate of the student's capability (ii) if the student came early to the mailing lists to ask for help writing the proposal (the mentors who helped them with their proposals have usually indicated this in the private comments) (iii) usefulness/appropriateness of the feature or work being proposed. Remember a good GSoC is more about getting promising new engineers into Boost and C++ than necessarily getting code to pass Boost peer review in a single summer. 8. Optional: If a proposal looks especially great to you and you feel able to mentor a student this year, please slide the "wish to mentor" button. Just because a proposal already has willing mentors does NOT mean you should not add yourself - we have at least two mentors with many attached very highly ranked proposals and we really don't want to have to reject an outstanding proposal just because we can't find the mentors for it as no mentor can realistically mentor more than two projects simultaneously. As you know, Google Summer of Code is usually worth $35,000 - $50,000 to Boost each year, and a successful GSoC raises our visibility and reputation in the wider open source community. Our thanks to you in advance for taking the time to vote. Niall Douglas Boris Schäling --- Boost C++ Libraries Google Summer of Code 2014 admin https://svn.boost.org/trac/boost/wiki/SoC2014

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[boost-build] building dependencies that use makefiles
by Mauricio Carneiro 24 Mar '14

24 Mar '14

I am using boost-build to build my project, but I have added a static library as a dependency that is built using GNU make. If I build this library manually, I can link it to my project in boost build using this simple Jamfile: lib hts : : <link>static <file>lib/lib.a : : <include>lib_headers ; Is there a way to tell boost-build to run make on the directory if the lib/lib.a is not present there? Thank you, Mauricio Carneiro, Ph.D. http://www.broadinstitute.org/~carneiro/

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lexical_cast between double and string slow in Visual Studio 2013
by David Roberts 24 Mar '14

24 Mar '14

In Boost 1.54 I have noticed that lexical_cast from double to string and back is much slower in Visual Studio 2013 (Visual C++ 12) than it was in Visual Studio 2010 (Visual C++ 10). The following test program demonstrates the problem: #include <boost/lexical_cast.hpp> #include <string> int main (int, char **) { for (double count = 0.0; count < 1000000.0; count += 1.41) { std::string result(boost::lexical_cast<std::string>(count)); count = boost::lexical_cast<double>(result); } return 0; } It can be built at the Visual Studio command prompt using: cl /O2 /EHsc /DNDEBUG /I\some\path\boost-1_54 lexcast.cpp to give the program lexcast.exe. When built with Visual Studio 2013 this program takes about 10 seconds to run on my machine. When built with Visual Studio 2010 it takes about 3 seconds. Is this already a known issue? If not I can do a bit more investigation to narrow down why it's so much slower, but I don't want to waste my time if this has already been done. Thanks, David

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About log example in visual studio 2008
by Xiande Cao 24 Mar '14

24 Mar '14

Hi, Experts, I was trying to run the log basic usage (libs/log/example/basic_usage/main.cpp) example in visual studio. And it crashed at line logging::add_console_log(std::clog, keywords::format = "%TimeStamp%: %Message%"); Stopped at // For compatibility with Boost.Log v1 we recognize %_% as the message attribute name const std::size_t len = end - begin; if (std::char_traits< char_type >::length(constants::message_text_keyword()) == len && std::char_traits< char_type >::compare(constants::message_text_keyword(), begin, len) == 0) { m_AttrName = log::aux::default_attribute_names::message(); } else { m_AttrName = attribute_name(log::aux::to_narrow(string_type(begin, end))); } Anybody has successfully run the example? Thanks! Regards, Triston

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Boost and Android NDK
by Philipp Kraus 24 Mar '14

24 Mar '14

Hello, I would like to use Boost on Nexus tablets. I have used Boost at the moment on desktop systems (OSX, Linux, Windows), so my question can I use Boost e.g. random, asio, ublas, … on a Nexus? I would like to build Boost myself, so imho I must build Boost with the NDK compilers and linker, is this correct? Can I build Boost libs in "one shot"? So the NDK has got tools for arm-linux, mipsel-linux and so on. Does anybody can tell me any hopeful tips to use Boost with Android Thanks Phil

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Fwd: Reg: named group finding using boost..
by swati upadhyaya 24 Mar '14

24 Mar '14

---------- Forwarded message ---------- From: swati upadhyaya <swatiupadhyaya(a)gmail.com> Date: Mon, Mar 24, 2014 at 11:33 AM Subject: Reg: named group finding using boost.. To: Boost...(a)lists.boost.org Hi @all, I have write a piece of code where I have a patter and a message and I have to fined the group name as well as match. With boost I am able to find the matches but *Is there a way to get a list or whatever of named captures/groups? * *I have check with re2 its present there but boost is much faster than re2.With glib also we dont have option for capturing group.. *

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Re: [Boost-users] [Boost][Range] Immutable range
by Albert Yiamakis 22 Mar '14

22 Mar '14

Hello, Thanks for reply. However, the second method of extending a range: http://www.boost.org/doc/libs/1_55_0/libs/range/doc/html/range/reference/ex… states that specializing both metafunctions is necessary. In particular this: https://gist.github.com/Kojirion/9714131 fails to compile. It will compile - and produce correct result - by commenting out all lines (ie defining a mutable iterator, which really isn't...) Albert

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[Boost][Range] Immutable range
by Albert Yiamakis 22 Mar '14

22 Mar '14

Hello, As far as I can tell from the documentation, it is not possible to create a range with const iterators only. Is this correct? Would it not make sense to have such a range that can be used with non-mutating algorithms only? Albert

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Bind to a member's class method.
by Konrad Rybacki 21 Mar '14

21 Mar '14

Hi, I am rather beginner at boost - I am trying to achieve functionality similiar to property getter/setter from managed languages like C#. I have written the following code: #include "boost\lambda\bind.hpp" #include "boost\variant.hpp" #include "boost\optional.hpp" #include <iostream> #include <map> class Test { public: boost::optional<boost::variant<int, std::string>> m_value; }; int _tmain(int argc, _TCHAR* argv[]) { Test t1, t2; auto b1 = boost::lambda::bind(&Test::m_value, boost::lambda::_1); auto b2 = boost::lambda::bind(Test::m_value::get_value_or, boost::lambda::_1, "empty"); b1(t1) = "Test value"; std::cout << b2(t1); // "Test value" std::cout << b2(t2); // Should be "empty" return 0; } Unfortunately the compilers says: boost_tests.cpp(32): error C3083: 'm_value': the symbol to the left of a '::' must be a type boost_tests.cpp(32): error C2039: 'get_value_or' : is not a member of 'Test' boost_tests.cpp(22) : see declaration of 'Test' boost_tests.cpp(32): error C2065: 'get_value_or' : undeclared identifier boost_tests.cpp(32): fatal error C1903: unable to recover from previous error(s); stopping compilation I'd like to create a bind to Test::m_value.get_value_or() function with the first parameter set to "empty" - any ideas how to achieve that? Regards, Konrad.

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passing pointer as function arg using boost::bind
by Lane 21 Mar '14

21 Mar '14

I'm having a problem passing a pointer as an arg via boost::bind and was hoping anyone could help out. I was able to pass 'a' just fine, but the second arg 'b' I'm having a problem with. Here is what I have. -- namespace NS { class MyThread { int doIt(NS::A a, B *b); // ... A a; B *b = new B(); NS::MyThread f_thread; boost::thread workerThread(boost::bind(&NS::MyThread::doIt, &f_thread, boost::ref(a), boost::ref(b))); Any help much appreciated.

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