December 2015 - Boost - lists.preview.boost.org

[smart_ptr] Moving cast for unique_ptr
by Karolin Varner 21 Dec '15

21 Dec '15

Hi all! There is the family of boost pointer cast (boost::static_pointer_cast, boost::dynamic_pointer_cast, ...) that allow a developer to write generic code by casting pointers regardless of whether they are some smart pointer (e.g. shared_ptr) or plain pointers. However, those functions have not been implemented for unique_ptr, because they create a copy of their pointer and unique_pointers can not be copied. In my case I still needed to cast some unique_ptr and since it's ok to move unique_ptrs I wrote a function that does exactly that. The code is below – Comments are very, very welcome. It works for my case, but I am sure it is not as generic and safe as it should be ;) . Specifically, for a library, it should be made to work on any kind of smart/plain pointer. Not just unique_ptr. Is there any interest to include a boost::static_moving_pointer_cast and the other types of casts in boost? Best, Karolin /// Dynamic cast a unique_ptr. /// /// This function shall move the pointer in in_ptr, into /// a new unique_pointer of the desire type, dynamic_casting /// it in the process. /// In given pointer shall contain a NULL pointer afterwards. /// /// If unsuccessful, function shall throw an error and leave /// in_ptr unmodified. /// /// This behaviour contrasts a bit with the behaviour of the /// normal dynamic_cast: /// 1. dynamic_cast copies objects, this moves them since /// unique_pointers can not be copied. /// 2. dynamic_cast returns a NULL pointer if the pointer to /// cast is of an incomplete type, this throws /// incomplete_cast instead, to ease error handling. /// /// @tparam T The type to convert to (as non-pointer) /// @tparam F The type to convert from (as non-pointer) /// @param in_ptr The unique_ptr to cast /// @return in_ptr, cast to the desired type template<typename T, typename F> std::unique_ptr<T> dynamic_moving_pointer_cast(std::unique_ptr<F> &in_ptr) { // Exception safety: If The dynamic cast throws an error, // or of we throw incomplete_cast, in_ptr will still be // unmodified T *plain_out_ptr = dynamic_cast<F*>(in_ptr.get()); if (plain_out_ptr == NULL && in_ptr.get() != NULL) throw incomplete_cast(); // Exception safety: Both operations are noexcept in_ptr.release(); return std::unique_ptr<T>(plain_out_ptr); }

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safe::map
by Karen Pease 21 Dec '15

21 Dec '15

Hi everyone - I'm new to boost-devel, and am a bit intimidated ;) I recently finished a project and I don't know if the boost community would have any interest in it, whether it's really "boost material" or not: https://github.com/KarenRei/safe-map The page goes into more detail, but the short of it is: after searching and a long conversation on StackExchange, I discovered that while there are threadsafe ordered-map containers out there, the threadsafety was a bit weak. For example, if you have Thread A iterating across the map and Thread B thread just happens to delete an element as A is passing by, A's iterator becomes invalidated and the program crashes - even in a supposedly "threadsafe" map. For the type of multithreaded cache that I needed, I needed a structure that had the thread safety level of a filesystem - you know, where multiple processes can have file descriptors open at a time and one process might even potentially delete a file that another is accessing, without leading to a system crash. And that's basically what I implemented: safe::map, which not only ensures that basic operations on the container itself are threadsafe, but that everything you do with the iterators - even deleting elements out of the map that other iterators are pointing to - is also threadsafe. It does this by implementing reference counting on the elements in the map and flagging elements for deletion rather than deleting them immediately. A more detailed description of usage, performance, implementation, use cases, etc is on the project page. The project comes with a test suite which launches a number of threads that endlessly randomly tweak and iterate around the map with every function available to them. Does this sound like something that might be useful in boost (after whatever changes would be required)? If there's no interest, no harm done :) - kv, Karen

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[Travis] All boostorg builds stalled?
by Louis Dionne 20 Dec '15

20 Dec '15

Hi, All of Hana's builds are currently stalled [1]. It has been like this for 2 or 3 days. I tried contacting Travis' support, but they are in vacation until January 4th. It also seems like the builds for Predef have been stalled for a while [2]. Perhaps other libraries are also touched. Strangely, builds for non-Boost repositories are not stalled, since I can build personal projects just fine. Does anyone know what might be happening? Louis [1]: https://travis-ci.org/boostorg/hana/builds [2]: https://travis-ci.org/boostorg/predef/builds/97532851

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[gsoc]Seeking Guidance
by Ibrahim Dalal 20 Dec '15

20 Dec '15

Hi I am a sophomore, majoring in Computer Science. I am also a GSoC'16 aspirant. Its the first time I would be contributing to an open source project. Can someone please guide to a small project/patch suitable for a beginner? I have familiarity with C++ programming language along with basic understanding of C and Python. Also have some elementary knowledge of Git. Thanks

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Boost 1.60.0 has been released
by Marshall Clow 18 Dec '15

18 Dec '15

Release 1.60.0 of the Boost C++ Libraries is now available. These open-source libraries work well with the C++ Standard Library, and are usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use. This release contains one new library and numerous enhancements and bug fixes for existing libraries. New Libraries * VMD: Variadic Macro Data library, from Edward Diener For details, including download links, see http://www.boost.org/users/news/version_1.60.0 You can also download directly from SourceForge: http://sourceforge.net/projects/boost/files/boost/1.60.0/ Tom Kent has made pre-built windows binaries, and they are available at: https://sourceforge.net/projects/boost/files/boost-binaries/1.60.0/ To install this release on your system, see http://www.boost.org/doc/libs/release/more/getting_started/index.html Thanks, --The Boost release team Vladimir Prus Rene Rivera Marshall Clow Eric Niebler Daniel James Beman Dawes

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[variant] Opinion on boost::safe_get<> and default boost::get<> behavior
by Antony Polukhin 18 Dec '15

18 Dec '15

Hi all, I'm in doubt and would like to hear opinions on the following issue. boost::get for boost::variant was not making any compile time checks, resulting in runtime errors where a compile time error must be: boost::variant<int, string> v(100); boost::get<bool>(&v); // returns NULL instead of compile time error boost::get<bool>(v); // throws exception on runtime instead of compile time error Now we have an implementation of compile time checked get in a separate branch at git: boost::variant<int, string> v(100); boost::safe_get<bool>(&v); // compile time error boost::safe_get<bool>(v); // compile time error boost::unsafe_get<bool>(&v); // returns NULL instead of compile time error boost::unsafe_get<bool>(v); // throws exception on runtime instead of compile time error I'm in doubt, what the default behavior of boost::get must be: * safe_get behavior is much closer to Standard Library behavior (just like std::get for tuples) and allows to avoid errors in user code * unsafe_get behavior is same as behavior of old boost::get and won't break user's code if boost::get is used in some generic contexs What's your opinion? -- Best regards, Antony Polukhin

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[QVM] Boost.QVM formal review is ongoing
by Adam Wulkiewicz 18 Dec '15

18 Dec '15

Dear Boost community, It seems that there are some problems with gmane.org related to handling of messages sent to many mailing lists at once. Therefore I'm reposting the information about the formal review. I appologize those of you who recieve this message for the second time. The formal review of Emil Dotchevski's QVM library begined on 7th Dec and it ends on 16th Dec. Boost QVM defines a set of generic functions and operator overloads for working with quaternions, vectors and matrices of static size with the emphasis on 2, 3 and 4-dimensional operations needed in graphics, video games and simulation applications. While it provides its own quaternion, matrix and vector types, it is designed to work primarily with user-defined types through user specializations of the q_traits, v_traits and m_traits templates. QVM's source code is available on Github: https://github.com/zajo/boost-qvm Full documentation is also viewable on Github: http://zajo.github.io/boost-qvm/ We encourage your participation in this review. At a minimum, kindly state: - Whether you believe the library should be accepted into Boost * Conditions for acceptance - Your name - Your knowledge of the problem domain. You are strongly encouraged to also provide additional information: - What is your evaluation of the library's: * Design * Implementation * Documentation * Tests * Usefulness - Did you attempt to use the library? If so: * Which compiler(s) * What was the experience? Any problems? - How much effort did you put into your evaluation of the review? More information about the review process can be found here: http://www.boost.org/community/reviews.html We await your feedback! Best regards, Adam Wulkiewicz

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[qvm] Formal review for QVM
by Adam Wulkiewicz 18 Dec '15

18 Dec '15

Dear Boost community, The formal review of Emil Dotchevski's QVM library begins on 7th Dec and ends on 16th Dec. Boost QVM defines a set of generic functions and operator overloads for working with quaternions, vectors and matrices of static size with the emphasis on 2, 3 and 4-dimensional operations needed in graphics, video games and simulation applications. While it provides its own quaternion, matrix and vector types, it is designed to work primarily with user-defined types through user specializations of the q_traits, v_traits and m_traits templates. QVM's source code is available on Github: https://github.com/zajo/boost-qvm Full documentation is also viewable on Github: http://zajo.github.io/boost-qvm/ We encourage your participation in this review. At a minimum, kindly state: - Whether you believe the library should be accepted into Boost * Conditions for acceptance - Your name - Your knowledge of the problem domain. You are strongly encouraged to also provide additional information: - What is your evaluation of the library's: * Design * Implementation * Documentation * Tests * Usefulness - Did you attempt to use the library? If so: * Which compiler(s) * What was the experience? Any problems? - How much effort did you put into your evaluation of the review? More information about the review process can be found here: http://www.boost.org/community/reviews.html We await your feedback! Best regards, Adam Wulkiewicz

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QVM Review
by Phil Endecott 17 Dec '15

17 Dec '15

Dear All, This is my review of Emil Dotchevski's QVM library. Thank you to Emil for offering this code. I believe that Boost and/or the standard library would benefit from vectors and matrices. Unfortunately I don't think that this proposal is what is needed, and I feel it should not be accepted. I have previously posted my thoughts about the terseness of the identifiers used and the use of operator,; I won't repeat the details here but in summary I find the syntax not to my taste, and not suitable for "public" code. Boost should aim to promote best practice, and I think this library falls short. Now, it's not unusual to find libraries that have interfaces that we don't like. Often we'll use them anyway because the features that the libraries provide outweigh the pain of using them. Does this apply in the case of QVM? Actually since first looking I've found that it does have more functionality than I thought - for example, I've only just found that it has functions to create matrices representing rotations (but not any other affine transformations) and to compute the inverse of a matrix (but not the determinant). But there's still not enough meat here for me to think it's worth using. If this were a comprehensive matrix algebra library, or a computational geometry library, or a SIMD library, then it might be worth putting up with the syntax. But it isn't, it's just a medium-size collection of operators and functions for quaternions, vectors and matrices that many projects will already having amongst their own local utilities. What it does offer is the ability to wrap existing matrix and vector classes and use a single unified syntax for all of them. It's just a shame that the single unified syntax is not the one I want to use! It is interesting to contrast QVM with Boost.Polygon and Boost. Geometry. The similarity is that both of these also wrap existing classes (for e.g. points) by traits class specialisations. When these were reviewed we discussed extensively how support for this compromised the friendliness of the syntax, i.e. the need to write get<0>(p) rather than p.x. What we ended up with there was I think the best that we could do, and it was probably worthwhile because of the substantial core functionality of each of those libraries. In my opinion, QVM doesn't reach that threshold. To address some of the "standard questions": I've not looked at the code, only the docs; I've spent a couple of hours this time and also looked when it was first proposed; and yes I do use vectors and matrices in my own code, for various graphics and cartographic purposes. Regards, Phil.

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Re: [boost] [Boost-users] Boost 1.60.0 rc1 is now available
by Marshall Clow 17 Dec '15

17 Dec '15

Thanks to everyone for testing and reporting back the problems with the RC. I have pinged Vicente about the Boost.Thread problem, and Sebastian about the Boost.PropertyTree warning supression patches. Antony is looking into the Boost.LexicalCast issue. After surveying the other release managers, none of these issues is worth holding up the release for (which would probably stretch to after the new year). We're going to "go with what we have" for the 1.60.0 release, and get these problems fixed for 1.61.0 -- Marshall

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Boost 1.58 linking error with Mongo 3.2
by Ameerkhan Mohamed 17 Dec '15

17 Dec '15

Hi, I am planning to use 3.2 mongo version. Hence i built client library of mongo 3.2 with pre-built boost library of 1.58. Both libraries are built under 64 bit configuration. Lib created successfully. When i integrate this libmongoclient-s.lib with my project i faced some linking error. Some of the sample error is :: Error LNK2001 unresolved external symbol "class boost::filesystem::file_status __cdecl boost::filesystem::detail::status(class boost::filesystem::path const &,class boost::system::error_code *)" (?status@detail@filesystem@boost @@YA?AVfile_status@23@AEBVpath@23@PEAVerror_code@system@3@@Z) StoreGrid_Head Error LNK2001 unresolved external symbol "class boost::system::error_code __cdecl boost::filesystem::detail::dir_itr_close(void * &)" (?dir_itr_close@detail @filesystem@boost@@YA?AVerror_code@system@3@AEAPEAX@Z) StoreGrid_Head Guide me on this issue please. Regards, Ameerkhan M -- Thanks and Regards Ameerkhan M Software Engineer Vembu Technologies

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Re: [boost] [Boost-announce] Boost 1.60.0 rc1 is now available
by Jan Mikkelsen 17 Dec '15

17 Dec '15

Hi, (Resending to avoid bouncing on the lists.) I can build the libraries on FreeBSD 10.2 with clang 3.7 and gcc 5.2 in various modes. However, with both clang 3.7 and gcc 5.2 the following program fails to compile: #define BOOST_MOVE_USE_STANDARD_LIBRARY_MOVE #include <boost/thread.hpp> int main() { } This works fine with the same compilers and boost 1.59. The difference seems to be caused a change to boost/thread/detail/thread_group.hpp to use boost::csbl::unique_ptr<> instead of std::auto_ptr<>. Diff showing the change between 1.59 and 1.60 in thread_group.hpp and the compiler error messages below. Regards, Jan Mikkelsen $ diff -u thread/detail/thread_group.hpp ../../boost-1_60/boost/thread/detail/thread_group.hpp --- thread/detail/thread_group.hpp 2015-12-17 01:08:28.000000000 +1100 +++ ../../boost-1_60/boost/thread/detail/thread_group.hpp 2015-12-17 01:20:56.000000000 +1100 @@ -6,6 +6,7 @@ // (C) Copyright 2007-9 Anthony Williams #include <list> +#include <boost/thread/csbl/memory/unique_ptr.hpp> #include <boost/thread/shared_mutex.hpp> #include <boost/thread/mutex.hpp> #include <boost/thread/lock_guard.hpp> @@ -75,7 +76,7 @@ thread* create_thread(F threadfunc) { boost::lock_guard<shared_mutex> guard(m); - std::auto_ptr<thread> new_thread(new thread(threadfunc)); + boost::csbl::unique_ptr<thread> new_thread(new thread(threadfunc)); threads.push_back(new_thread.get()); return new_thread.release(); } $ g++5 -std=c++14 -isystem /usr/local/include/boost-1_60 twio/test_thread.cpp In file included from /usr/local/include/boost-1_60/boost/thread/csbl/memory/unique_ptr.hpp:16:0, from /usr/local/include/boost-1_60/boost/thread/detail/thread_group.hpp:9, from /usr/local/include/boost-1_60/boost/thread/thread.hpp:13, from /usr/local/include/boost-1_60/boost/thread.hpp:13, from twio/test_thread.cpp:2: /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp: In constructor 'boost::movelib::unique_ptr<T, D>::unique_ptr(boost::movelib::unique_ptr<T, D>&&)': /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:530:29: error: 'move_if_not_lvalue_reference' is not a member of 'boost' : m_data(u.release(), ::boost::move_if_not_lvalue_reference<D>(u.get_deleter())) ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:530:68: error: expected primary-expression before '>' token : m_data(u.release(), ::boost::move_if_not_lvalue_reference<D>(u.get_deleter())) ^ In file included from /usr/local/include/boost-1_60/boost/thread/csbl/memory/unique_ptr.hpp:16:0, from /usr/local/include/boost-1_60/boost/thread/detail/thread_group.hpp:9, from /usr/local/include/boost-1_60/boost/thread/thread.hpp:13, from /usr/local/include/boost-1_60/boost/thread.hpp:13, from twio/test_thread.cpp:2: /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp: In constructor 'boost::movelib::unique_ptr<T, D>::unique_ptr(boost::movelib::unique_ptr<Y, D>&&, typename boost::move_upd::enable_up_moveconv_constr<T, D, U, E>::type*)': /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:552:29: error: 'move_if_not_lvalue_reference' is not a member of 'boost' : m_data(u.release(), ::boost::move_if_not_lvalue_reference<E>(u.get_deleter())) ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:552:68: error: expected primary-expression before '>' token : m_data(u.release(), ::boost::move_if_not_lvalue_reference<E>(u.get_deleter())) ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp: In member function 'boost::movelib::unique_ptr<T, D>& boost::movelib::unique_ptr<T, D>::operator=(boost::movelib::unique_ptr<T, D>&&)': /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:581:26: error: 'move_if_not_lvalue_reference' is not a member of 'boost' m_data.deleter() = ::boost::move_if_not_lvalue_reference<D>(u.get_deleter()); ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:581:65: error: expected primary-expression before '>' token m_data.deleter() = ::boost::move_if_not_lvalue_reference<D>(u.get_deleter()); ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp: In member function 'typename boost::move_upd::enable_up_moveconv_assign<T, D, U, E, boost::movelib::unique_ptr<T, D>&>::type boost::movelib::unique_ptr<T, D>::operator=(boost::movelib::unique_ptr<Y, D>&&)': /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:603:26: error: 'move_if_not_lvalue_reference' is not a member of 'boost' m_data.deleter() = ::boost::move_if_not_lvalue_reference<E>(u.get_deleter()); ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:603:65: error: expected primary-expression before '>' token m_data.deleter() = ::boost::move_if_not_lvalue_reference<E>(u.get_deleter()); ^ $ clang++37 -std=c++14 -isystem /usr/local/include/boost-1_60 twio/test_thread.cpp In file included from twio/test_thread.cpp:2: In file included from /usr/local/include/boost-1_60/boost/thread.hpp:13: In file included from /usr/local/include/boost-1_60/boost/thread/thread.hpp:13: In file included from /usr/local/include/boost-1_60/boost/thread/detail/thread_group.hpp:9: In file included from /usr/local/include/boost-1_60/boost/thread/csbl/memory/unique_ptr.hpp:16: /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:530:67: error: 'D' does not refer to a value : m_data(u.release(), ::boost::move_if_not_lvalue_reference<D>(u.g... ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:353:26: note: declared here template <class T, class D = default_delete<T> > ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:530:38: error: no member named 'move_if_not_lvalue_reference' in namespace 'boost' : m_data(u.release(), ::boost::move_if_not_lvalue_reference<D>(u.g... ~~~~~~~~~^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:552:67: error: 'E' does not refer to a value : m_data(u.release(), ::boost::move_if_not_lvalue_reference<E>(u.g... ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:548:29: note: declared here template <class U, class E> ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:552:38: error: no member named 'move_if_not_lvalue_reference' in namespace 'boost' : m_data(u.release(), ::boost::move_if_not_lvalue_reference<E>(u.g... ~~~~~~~~~^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:581:64: error: 'D' does not refer to a value m_data.deleter() = ::boost::move_if_not_lvalue_reference<D>(u.get_... ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:353:26: note: declared here template <class T, class D = default_delete<T> > ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:581:35: error: no member named 'move_if_not_lvalue_reference' in namespace 'boost' m_data.deleter() = ::boost::move_if_not_lvalue_reference<D>(u.get_... ~~~~~~~~~^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:603:64: error: 'E' does not refer to a value m_data.deleter() = ::boost::move_if_not_lvalue_reference<E>(u.get_... ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:597:29: note: declared here template <class U, class E> ^ /usr/local/include/boost-1_60/boost/move/unique_ptr.hpp:603:35: error: no member named 'move_if_not_lvalue_reference' in namespace 'boost' m_data.deleter() = ::boost::move_if_not_lvalue_reference<E>(u.get_... ~~~~~~~~~^ 8 errors generated. > On 15 Dec 2015, at 02:54, Marshall Clow <mclow.lists(a)gmail.com <mailto:mclow.lists@gmail.com>> wrote: > > Release candidate files for 1.60.0 are available at: http://boost.cowic.de/rc/ <http://boost.cowic.de/rc/> > > As always, the release managers would appreciate it if you download > the candidate of your choice and give building it a try. Please report > both success and failure, and anything else that is noteworthy. > > This helps ensure the candidates build OK before we push them out to SourceForge. > > The files (and associated md5s) are: > MD5 (boost_1_60_0_rc1.7z) = 7ce7f5a4e396484da8da6b60d4ed7661 > MD5 (boost_1_60_0_rc1.tar.bz2) = 65a840e1a0b13a558ff19eeb2c4f0cbe > MD5 (boost_1_60_0_rc1.tar.gz) = 28f58b9a33469388302110562bdf6188 > MD5 (boost_1_60_0_rc1.zip) = 0cc5b9cf9ccdf26945b225c7338b4288 > > Thanks! > > -- The release managers > > P.S. Release notes are here: http://www.boost.org/users/history/version_1_60_0.html <http://www.boost.org/users/history/version_1_60_0.html> > > _______________________________________________ > Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost-announce <http://lists.boost.org/mailman/listinfo.cgi/boost-announce>

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QVM formal review extension request
by Adam Wulkiewicz 16 Dec '15

16 Dec '15

Dear Boost Community! The number of reviews we received so far is too small to decide wether or not QVM should be a part of Boost. Therefore I request to extend the review period by a week to 23rd Dec. I'm aware that the time of year may be busy and that we're in the middle of Boost release. I hope that the extension would allow you to find time to write a short piece of review. -----The original announcement----- The formal review of Emil Dotchevski's QVM library is ongoing. Boost QVM defines a set of generic functions and operator overloads for working with quaternions, vectors and matrices of static size with the emphasis on 2, 3 and 4-dimensional operations needed in graphics, video games and simulation applications. While it provides its own quaternion, matrix and vector types, it is designed to work primarily with user-defined types through user specializations of the q_traits, v_traits and m_traits templates. QVM's source code is available on Github: https://github.com/zajo/boost-qvm Full documentation is also viewable on Github: http://zajo.github.io/boost-qvm/ We encourage your participation in this review. At a minimum, kindly state: - Whether you believe the library should be accepted into Boost * Conditions for acceptance - Your name - Your knowledge of the problem domain. You are strongly encouraged to also provide additional information: - What is your evaluation of the library's: * Design * Implementation * Documentation * Tests * Usefulness - Did you attempt to use the library? If so: * Which compiler(s) * What was the experience? Any problems? - How much effort did you put into your evaluation of the review? More information about the review process can be found here: http://www.boost.org/community/reviews.html We await your feedback! Best regards, Adam Wulkiewicz

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Boost 1.60.0 rc1 is now available
by Marshall Clow 15 Dec '15

15 Dec '15

Release candidate files for 1.60.0 are available at: http://boost.cowic.de/rc/ As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. The files (and associated md5s) are: MD5 (boost_1_60_0_rc1.7z) = 7ce7f5a4e396484da8da6b60d4ed7661 MD5 (boost_1_60_0_rc1.tar.bz2) = 65a840e1a0b13a558ff19eeb2c4f0cbe MD5 (boost_1_60_0_rc1.tar.gz) = 28f58b9a33469388302110562bdf6188 MD5 (boost_1_60_0_rc1.zip) = 0cc5b9cf9ccdf26945b225c7338b4288 Thanks! -- The release managers P.S. Release notes are here: http://www.boost.org/users/history/version_1_60_0.html

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Boost 1.60.0 beta 1 Release Candidate 4 available for testing
by Marshall Clow 15 Dec '15

15 Dec '15

After far too long, release candidate files for 1.60.0 beta 4 are available at http://boost.cowic.de/rc/ As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. Changes since rc3: * Boost.Test has been updated and now builds on Visual Studio Changes since rc1: * Boost.Sprit has been updated and Boost.Log now builds. * Boost.Math has been updated and now builds. Known issues (which will not be fixed for the beta): * Errors when building Boost.TypeErasure for older versions of Visual Studio. * Boost.Test fails when building on Darwin with gcc 4.9.2 The files (and associated md5s) are: MD5 (boost_1_60_0_b1_rc4.7z) = 63530c9594b24f56e5df79d910c9daeb MD5 (boost_1_60_0_b1_rc4.tar.bz2) = 29af12a1028536219a21517e953df4eb MD5 (boost_1_60_0_b1_rc4.tar.gz) = 74df7f5eb5e32f3a92b6141af3c6f541 MD5 (boost_1_60_0_b1_rc4.zip) = 90c25c34b64eb6cc88845ec5372938d7 Thanks! -- The release managers

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Fwd: Re: [Boost-users] [boost-users][QVM] Boost.QVM formal review is ongoing
by Adam Wulkiewicz 15 Dec '15

15 Dec '15

It seems that you've send a response to the boost-users list and I'm guessing Emil is not a subscriber because he haven't responded. So I'm forwarding it to the developers mailing list. -----Original Message----- I'm not qualified to give a full review of this library beyond observing: 1 It looks very useful. 2 Boost prefers clarity to curtness. The naming is much too terse making the resulting code rather 'write-only'. I'd at least go for col_mat for col_m and transpose for transp etc. (I know any changes will be a big PITA but shows that asking sooner than later is a good idea for would-be Boost library authors ;-) 3 Documentation is OK, but I'd like many more examples of every function, and some much bigger fuller real-life examples showing use too. 4 Does this mesh at all with the quaternions in Boost.Math library? FWIW Paul PS If you build the Boost inspect tool \modular-boost\tools\inspect by running its jamfile, (and making sure that it is in your PATH) then from your /doc folder you can simply call > inspect > inspect.html and view any transgressions of the Boost rules in inspect.html - and, most important, any dud links. You may get a few false positives, but you can spot these easily. --- Paul A. Bristow Prizet Farmhouse Kendal UK LA8 8AB +44 (0) 1539 561830 _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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QVM formal review update
by Adam Wulkiewicz 15 Dec '15

15 Dec '15

Dear Boost Community! We're near the end of the QVM formal review period, it ends on 16th Dec. So far 11 people participated in discussions (not taking Emil nor me into account) and 2 reviews were sent. Do anyone of you need more time to ask questions, discuss, think, familiarize with QVM before sending a review? Are there people who would like to participate but haven't found enough free time so far? Basically I'm asking if anyone thinks that a review period should be extended? We appreciate your time and effort and of course kindly ask for sending reviews whenever you're ready. <TL;DR> -----The original announcement----- The formal review of Emil Dotchevski's QVM library is ongoing, it started on 7th Dec and it ends on 16th Dec. Boost QVM defines a set of generic functions and operator overloads for working with quaternions, vectors and matrices of static size with the emphasis on 2, 3 and 4-dimensional operations needed in graphics, video games and simulation applications. While it provides its own quaternion, matrix and vector types, it is designed to work primarily with user-defined types through user specializations of the q_traits, v_traits and m_traits templates. QVM's source code is available on Github: https://github.com/zajo/boost-qvm Full documentation is also viewable on Github: http://zajo.github.io/boost-qvm/ We encourage your participation in this review. At a minimum, kindly state: - Whether you believe the library should be accepted into Boost * Conditions for acceptance - Your name - Your knowledge of the problem domain. You are strongly encouraged to also provide additional information: - What is your evaluation of the library's: * Design * Implementation * Documentation * Tests * Usefulness - Did you attempt to use the library? If so: * Which compiler(s) * What was the experience? Any problems? - How much effort did you put into your evaluation of the review? More information about the review process can be found here: http://www.boost.org/community/reviews.html We await your feedback! Best regards, Adam Wulkiewicz

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safe integer library -- the scope
by Andrzej Krzemienski 14 Dec '15

14 Dec '15

Hi Robert, It is great to see this library getting into Boost. It fills an important gap, but it is only after a long while that I realized that, because the introductory part of the documentation does not stress it enough, and in fact it misled me a bit. My understanding is that safe<int> represents a high level abstraction of an integral number from mathematics: unlike raw type int, which represents a set of allowed operations on the underlying processor. You could say that raw type 'int' is only needed to efficiently implement higher level abstractions, like BigInt or safe<int> -- the two only differ in trade-offs between efficiency and the range of values they can represent. I was missing this in the introduction. Instead I got a somewhat negative impression that the goal of the library is to turn any UB into throwing exceptions (and thereby prevent any UB-based static analysis from detecting programmer errors). I would like to see the library in Boost, although I must admit the other parts do not sound that compelling as safe<int>. Regards, &rzej

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Query About Boost Soc2016
by Arafat Khan 14 Dec '15

14 Dec '15

Respected Sir/Mam I am Arafat Dad Khan, I am a second year undergraduate student at Indian Institute of Technology Kharagpur. I wish to contribute to the Boost Library. I have decent *knowledge of Algorithms and Data Structures *and have consistently taken part in algorithmic competitions on websites such as Codechef and Spoj(Sphere online Judge ) You can view my profiles here http://www.spoj.com/SPOJ/users/adk/ and here https://www.codechef.com/users/adkcodeme I am *looking for potential mentors for Gsoc 2016* so that i start contributing by working on a small tasks first.I want develop requirements for my proposal by doing *initial background research on the topic*, and interact with the mentors and community to help identify expectations for projects . Regards Arafat Dad Khan Indian Institute of Technology Kharagpur

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Reminder - Master branch closes for release on Sunday night
by Marshall Clow 11 Dec '15

11 Dec '15

I will be making the RC for the 1.60 release Monday morning. Changes that are not merged into master before then will NOT be in the 1.60 release. -- Marshall

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[qvm] Terseness of syntax etc.
by Phil Endecott 11 Dec '15

11 Dec '15

Adam Wulkiewicz wrote: > The formal review of Emil Dotchevski's QVM library begins today > on 7th Dec and ends on 16th Dec. > Full documentation is also viewable on Github: > http://zajo.github.io/boost-qvm/ Following are some comments about the docs and syntax. This is based on an earlier look at the library when it was first announced and a quick look recently to see what has changed. I've not looked at the source code or tried to use the library. I wish that the docs started with a page showing how to use the library's built-in types. Currently, the first code that is presented shows how to define traits to make a user-supplied type work with the library. This is too advanced for the first page of the tutorial. The docs should start by showing how to do some high-school vector algebra using the built-in vector and matrix types. I find most of the identifiers too short. To give just a couple of examples: "transp" is used to mean "transpose". You save typing three letters, and get confusion with transparent, transport, etc. Then look at the names of some traits classes; elsewhere we have type_traits, allocator_traits, iterator_traits etc. all spelt out in full, but in qvm we have q_traits, v_traits and m_traits. I could go on but really almost every identifier is too short for my tastes. I had a quick think about how a struct with x,y,z members could be adapted. Am I right in thinking that it would be necessary to write accessors like this inside the traits specialisation: float ir(int i, xyz_vec const & v) { switch (i) { case 0: return v.x; case 1: return v.y; case 2: return v.z; } } ? If so, do we think that a compiler would successfully optimise that when it realised that x, y and z were in contiguous memory? (I guess you could also have an array of member pointers; would that work any better?) I'm really not a fan of the old operator% and now operator, syntax. To me, (v,XY) looks like you're forming a row-vector with two elements. Is there a reason why these accessors can't be written with function syntax, i.e. XY(v) ? Or, for matrices, something like element<4,2>(m) rather than (m,A<4,2>) ? I guess that what we'd really like to be able to do is to override operator. and write v.XY. There are proposals for adding operator. to the core language. Would those proposals support what is needed here? Actually, maybe this is closer to another proposal - the unified call syntax, which would make v.XY() equivalent to XY(v). I'll be interested to see what others think about these and other aspects of the proposal. Regards, Phil.

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[QVM] Help with small example
by Rajaditya Mukherjee 10 Dec '15

10 Dec '15

I am trying to run boost::qvm on my machine. I am using MS Visual Studio 2013 with Boost 1.59 as the backend. #include <boost/qvm/all.hpp> #include <iostream> class float4 { public: float4(float a, float b, float c, float d) { container[0] = a; container[1] = b; container[2] = c; container[3] = d; } float container[4]; }; namespace boost { namespace qvm { template<> struct v_traits<float4> { static int const dim = 3; typedef float scalar_type; template <int I> static inline scalar_type &w(float4 & v) { return v.container[I]; } template <int I> static inline scalar_type r(float4 const & v) { return v.container[I]; } static inline scalar_type &iw(int i, float4 &v) { return v.container[i]; } static inline scalar_type ir(int i, float4 const & v) { return v.container[i]; } }; } } int main() { float4 vec(11.0,0.0,5.0,-6.0); std::cout << boost::qvm::mag(vec); (vec,boost::qvm::A<1>) = 112.0; std::cout << boost::qvm::mag(vec); } In the line *(vec,boost::qvm::A<1>) = 112.0, *I am getting an compiler error that says error C2563: mismatch in formal parameter list error C2568: ',' : unable to resolve function overload 1> d:\dropbox\programs\boost_qvm\include\boost\qvm\v_access.hpp(79): could be 'boost::qvm::vector_access_tag<I> boost::qvm::A(void)' 1> d:\dropbox\programs\boost_qvm\include\boost\qvm\m_access.hpp(78): or 'boost::qvm::matrix_access_tag<R,C> boost::qvm::A(void)' Any help ? Maybe I am doing something stupid ? Any help by Emil or anyone else is appreciated. *Rajaditya Mukherjee * *3rd Year Graduate Student* Dept. of Computer Science and Engineering The Ohio State University Columbus, Ohio Tel :- +1-(614)-271-4439 email :- rajaditya.mukherjee(a)gmail.com <mukherjee.62(a)osu.edu>, raj(a)rajaditya.com <mukherjr(a)cse.ohio-state.edu>

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Master branch is open for merging
by Marshall Clow 10 Dec '15

10 Dec '15

Thanks to everyone for their patience; the master branch is now open for merging. Remember, we're coming up to a release, so please, no breaking changes. Thanks! -- Marshall

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[Property_tree] error with ptree_serialization in 1.59
by David Bernstein 10 Dec '15

10 Dec '15

Hi Everyone, This is my first post here, hopefully I’m at the right place but if not please let me know where I should go. I have a C++ class which uses boost::property_tree and also includes <boost/property_tree/ptree_serialization.hpp>. This has been working nicely until I upgraded to V1.59 today and now I’m getting the compile error below. Any help with this would be greatly appreciated! Thanks, Dave /usr/local/include/boost/property_tree/ptree_serialization.hpp:66:24: error: no type named 'library_version_type' in namespace 'boost::archive' const bsa::library_version_type library_version( ~~~~~^ /usr/local/include/boost/property_tree/ptree_serialization.hpp:69:21: error: no member named 'library_version_type' in namespace 'boost::archive' if(bsa::library_version_type(3) < library_version){ I This e-mail is covered by the Electronic Communication Privacy Act, 18 U.S.C. Section 2510-2521 and may be legally privileged. If you have received this transmission in error, please notify the original sender immediately by return e-mail or by telephone at the telephone number provided above and delete/trash the original message from your system. Thank you for your assistance. The information contained herein is confidential information provided only for the use of the individual or entity for whom it was intended. If the reader of this message received it in error, is not the intended recipient, or if an attachment is made in error, the reader is hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited.

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Using BOOST_AUTO_TEST_CASE_TEMPLATE but passing a list of test values too
by Paul A. Bristow 10 Dec '15

10 Dec '15

I want to test a (quite large) variety of user-defined types using Boost.Test. As a very contrived example, suppose I wanted to check numeric_limits digits for integer types I'd like to avoid a tediously long list like this BOOST_CHECK_EQUAL(std::numeric_limits<char>::digits, 8); BOOST_CHECK_EQUAL(std::numeric_limits<char>::digits, 16); BOOST_CHECK_EQUAL(std::numeric_limits<char>::digits, 32); ... and follow the example of BOOST_AUTO_TEST_CASE_TEMPLATE but allow a test value to be passed too, something like this: typedef boost::mpl::list<char, int, long> test_types; and a list of test values, perhaps like this typedef list_c<int, 8, 32, 64> test_values; (However it would be *far* more useful to be able to test strings and floats and User-defined types too). BOOST_AUTO_TEST_CASE_TEMPLATE_????(digits_test, T, test_types, test_values) { BOOST_CHECK_EQUAL(std::numeric_limits<T>::digits, test_values); } Has any Macro Guru produced a BOOST_AUTO_TEST_CASE_TEMPLATE_? that includes a list of test values? Or other suggestions. Thanks Paul --- Paul A. Bristow Prizet Farmhouse Kendal UK LA8 8AB +44 (0) 1539 561830

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