March 2014 - Boost-users - lists.boost.org

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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[lockfree] spsc_queue unqiue_ptr
by Michael Marcin 21 Mar '14

21 Mar '14

Can you store unique_ptrs in a spsc_queue?

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[log] BOOST_LOG_GLOBAL_LOGGER_* in DLL
by Michael Marcin 21 Mar '14

21 Mar '14

I'm trying to use BOOST_LOG_GLOBAL_LOGGER_DEFAULT( my_logger, boost::log::sources::severity_logger_mt<boost::log::trivial::severity_level> ) In a dll but it doesn't appear to be getting initialized. The first BOOST_LOG_SEV results in a crash due to core being null. How do I initialize a global logger in a DLL?

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[Fusion] Issue with map and c++11 (ticket 9455)
by Chris Crickmar 20 Mar '14

20 Mar '14

https://svn.boost.org/trac/boost/ticket/9455 I posted this bug report a few months ago and thought I'd follow up on the mailing list to highlight it. To summarise, in-place construction of a class containing a fusion map is broken since 1.55 with gcc 4.8/4.7 in c++11 mode. The problem is not present with c++11 mode disabled or when using previous boost versions (tested with 1.51 & 1.54). I re-tested this issue today using git master and the issue is still present. Chris Crickmar

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