November 2012 - Boost - lists.preview.boost.org

★ Boost, Bruce left a message for you
by Badoo 08 Nov '12

08 Nov '12

Bruce left a message for you Only you can see the sender and content of your message, and you can delete it anytime. You can instantly reply using our message exchange system: http://eu1.badoo.com/tortoise74/in/3i4doZuulPE/?lang_id=3&m=21&mid=509c4330… If the link in this message does not work, try copying and pasting it into your browser. This email is part of our delivery procedure for the message sent by Bruce. If you have received this email by mistake, please ignore it. The message will be deleted soon. Have fun! The Badoo Team You have received this email from Badoo Trading Limited (postal address below). http://eu1.badoo.com/impersonation.phtml?lang_id=3&email=boost%40lists.boos… Badoo Trading Limited is a limited company registered in England and Wales under CRN 7540255 with its registered office at Media Village, 131 - 151 Great Titchfield Street, London, W1W 5BB.

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[test]portability of data test cases and build issues
by Gennadiy Rozenal 08 Nov '12

08 Nov '12

Hi, I've been working on portability fixes for new features in boost.test. They now works fine with gcc 4.6 and 4.7 msvc-10.0 and msvc-11.0. My attempt with clang on linux lead to compiler crashing, but I see it passing in regression on darwin, so I am not sure on the status. I do still have some issues about portability and boost.build: 1. Boost.Build does not handle correctly target foo with sources residing in subdirectory foo under location of Jamfile. I had to rename directory boost/libs/test/test/test_datasets into test_datasets_src, because of that. 2. How do I tell that I want to pass compilation to gcc in toolset gcc-4.7 only? I've tried <toolset>gcc-4.7:<cxxflags>-std=c++11 and <toolset>gcc-4.7.2:<cxxflags>-std=c++11 and either one does not work. <toolset>gcc:<cxxflags>-std=c++11 does work, but I want to pass different options for different versions of gcc. 3. Question: Should I tell *unconditionally* in Boost.Test Jamfile in boost/libs/test/build that I want to pass -std=c++11/-std=c++0x depending on a version? If not, how do I test test_dataset target with this option? Also How do I disable for configurations which does not support it? 4. Issues with regression testers setup? If you look here: http://www.boost.org/development/tests/trunk/developer/test.html You will see that: a) clang linux columns are empty. Why is that? b) msvc-11.0 setup is broken because of: 'cl' is not recognized as an internal or external command, operable program or batch file. c) sun setup is broken because of: /bin/sh: line 2: CC: not found Can we fix these? 5. Portability for other compilers. I am not quite sure which is lowest version of gcc this feature works. Anyone who is interested in making it work with older/different compilers feel free to submit patches. Regards, Gennadiy

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Release branch closed
by Marshall Clow 08 Nov '12

08 Nov '12

Boosters, The release branch is now closed for all commits, except by explicit permission of release managers. -- The Release Managers, Beman Dawes Daniel James Eric Niebler Rene Rivera Vladimir Prus Marshall Clow

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[thread] warning in trunk
by Gennadiy Rozental 08 Nov '12

08 Nov '12

Hi, Can anyone clean this one: boost/thread/future.hpp(378) : warning C4913: user defined binary operator ',' exists but no overload could convert all operands, default built-in binary operator ',' used Gennadiy

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[OT] std::complex warts
by Neal Becker 08 Nov '12

08 Nov '12

std::complex doesn't seem to allow mixing of types in arithmetic operations. This is quite inconvenient for code that is generic on the base float type. For example: template<typename flt_t> flt_t some_function (std::complex<flt_t> z) { return 2. * z / 4.2 + ... } This will fail to compile when flt_t == float (but succeeds for double). casting every constant in a large computation is really not an acceptable option. Thoughts?

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[type_traits] is_convertible<int, int&> inconsistent result
by TONGARI 08 Nov '12

08 Nov '12

Hi, I'd expect boost::is_convertible<int, int&>::value to be false, so I was surprised that it gives me "true" under g++ 4.7.1. Switch to std::is_convertible<int, int&> or using clang instead gives me the expected "false". After some search, I found: https://svn.boost.org/trac/boost/ticket/7251 Any plan to fix it?

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[variant] static_visitor has no virtual destructor.
by Pierre Talbot 08 Nov '12

08 Nov '12

Hello, I have a compilation error with Boost (1.52) and g++ (4.7) with the flag -Weffc++: error: base class ‘class boost::static_visitor<std::basic_string<char> >’ has a non-virtual destructor [-Werror=effc++] And the static_visitor class is defined with a protected non-virtual destructor: template <typename R = ::boost::detail::static_visitor_default_return> class static_visitor : public detail::is_static_visitor_tag { public: // typedefs typedef R result_type; protected: // for use as base class only static_visitor() { } ~static_visitor() { } }; Is it normal ? And if it is, how to avoid this error ? Thank you for your help, Pierre Talbot.

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Adding an option to set the name of a boost::thread
by david.hagood＠gmail.com 07 Nov '12

07 Nov '12

Has any thought been given to allowing a name to be set on a boost::thread, such that (if the underlying implementation supports it) that name would show up in things like top and ps? In Linux, you can name a thread via the prctl() call and it will show up in top - dandy for debugging which of the bazillion threads in my app has decided to suck up all the CPU. I don't know if Windows supports such a call, and IMHO it would be acceptable if the call did nothing in such a case. Ideally, I'd want to see it as a property, something like: void boost::thread::set_name(std::string name) std::string boost::thread::get_name() const;

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[algorithm] Knuth-Morris-Pratt Search docs overly terse
by Jeff Flinn 07 Nov '12

07 Nov '12

I'm not sure if this is intentional but: http://www.boost.org/doc/libs/1_52_0/libs/algorithm/doc/html/the_boost_algo… contains only: Overview The header file 'knuth_morris_pratt.hpp' contains an an implementation of the Knuth-Morris-Pratt algorithm for searching sequences of values. I've created Ticket #7656. Jeff

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[functional] Interested in can_be_called<F, Sig> metafunction?
by TONGARI 07 Nov '12

07 Nov '12

Hi there, I've used this metafunction for some time, and it just fitted my need. Recently, I make up my mind to complete it, willing to put it in public. Synopsis -------------- can_be_called<F, Sig> F Any callable type to test, even member-function ptr. Sig The desired calling signature, function-type only. Example ------------- struct X; struct F { void operator()(); }; can_be_called<void(int), void(char)>::type // mpl::true_ can_be_called<int(), void()>::type // mpl::true_, return val can always be discarded can_be_called<int(), int&()>::type // mpl::false_, cannot return as reference can_be_called<void(int&), void(int)>::type // mpl::false_, cannot accept rvalue can_be_called<void(), void(*)()>::type // compile error, "void(*)()" not a function-type can_be_called<F, void()>::type // mpl::true_ can_be_called<F const, void()>::type // mpl::false_, F::operator() is non-const can_be_called<void(X::*)(), void()>::type // mpl::true_, only the signature part is concerned can_be_called<void(X::*)(), void(X*)>::type // mpl::false_, implicit 'this' arg not accounted Repository ---------------- https://github.com/jamboree/boost.functional test files provided, compile well on g++ 4.7.1 & clang 3.2 No docs are written (yet), if you're interested, please let me know and I'll prepare for review or something... Comments are welcome :)

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