February 2014 - Boost - lists.boost.org

[utility] Missing current_function.hpp
by Edward Diener 15 Feb '14

15 Feb '14

From modular boost: switch to develop git pull git submodule update b2 headers No current_function.hpp anywhere switch to master git pull git submodule update b2 headers No current_function.hpp anywhere What am I missing ?

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NT² 3.0 and Boost.SIMD - Stable release
by Joel Falcou 15 Feb '14

15 Feb '14

The first stable release of the 3.x series of MetaScale’s open-source software is available: NT² 3.0. It also includes its spin-off project, Boost.SIMD (not yet a Boost library). Many Issues have been closed since last beta. The main focus of this release cycle was to fix performances issues and to stabilize some parts of the API. Next step will be to separate NT2 and Boost.SIMD into separate repositories, thus making one more step toward Boost.SIMD submission into review. [ http://www.metascale.org/nt%C2%B2-3-0-and-boost-simd ] *Changes & Bug Fixes:* - Major performance improvements in both libraries - Added experimental support for the HPX runtime for parallelization on shared memory systems - Optimizations of many elemental functions, in particuler log/ex, frexp/ldexp and cbrt - More advanced shuffle pattern recognition for SIMD - Fixed issues with Visual Studio 2013 - More functions are force-inlined to ensure good performance - New functions for conversion between types and mixing of vectors of different sizes - Demo applications usable as benchmarks - Better handling of errors when an unsupported function is called - New API for custom memory allocators Full changelog is available at https://github.com/MetaScale/nt2/releases/tag/3.0.0. *How to get it ?* - Source and binary packages can be downloaded here: http://nt2.metascale.org/downloads - The release is also available on Github : https://github.com/MetaScale/nt2/releases - The main master branch is still under development : https://github.com/MetaScale/nt2

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Refactoring tools/regression and tools/release into separate sub-modules
by Beman Dawes 14 Feb '14

14 Feb '14

The tools used by regression testers and regression reporting, and the tools used by release managers are currently part of the boost-super project. As we gain experience with Git and submodules, it is becoming clear these need to be decomposed into two separate submodules. Among other advantages, that would speed work on these tools as we could better utilize volunteers without having to hand out excessive super-project write permissions. We would like one or two volunteers to do the refactoring. You don't need to be a library maintainer or release manager, although that's fine if you are. You do need git skills, as we do want to preserve history. Comments? --The release managers

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Introducing Boost.Optional co-mantainer
by Fernando Cacciola 14 Feb '14

14 Feb '14

Hello, I am pleased to announce that Andrzej Krzemienski will be a co-mantainer for Boost.Optional His goal is to (finally!) implement: 1. Move semantics emulation (C++-3 compatible). 2. Function value() from tr2::optional that either returns a value or throws. For those of you who don't know Andrzej, he is the main force behind the standarizaztion of std::optional Once again, thank you very much Andrzej ! -- Fernando Cacciola SciSoft Consulting, Founder http://www.scisoft-consulting.com

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General Advice Thankyou - now I need a Trac login
by Fletcher, John P 14 Feb '14

14 Feb '14

Thank you for the helpful responses and a lot of new information. I now need a trac login and to be assigned as the maintainer for Phoenix. I have not found instructions for getting a Trac login. Please help. John

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path of test-binary
by dib 14 Feb '14

14 Feb '14

Hi, within the tests of a (not-yet) boost-library, how can I find out the path where b2 placed the binaries of the tests? Problem is the following: Some of the tests need the path to a shared library, which is built together with the tests. In the lib/mylib/tests/Jamfile.v2 I have the following: [...] # our test lib for shared library tests lib test_library : test_library.cpp ; test-suite mylib : # # shared library # [ run shared_library_load_test.cpp ] [ run shared_library_get_symbol_test.cpp ] # # [...] Inside shared_library_*_test.cpp I need something like this: boost::filesystem::path tstlib("bin.v2/libs/mylib/test/mycompiler/test_library.so"); As boost.build decides by itself where to put the binary, i cannot hardcode the path in the source-files.. Is there a way to get the path from boost.build? If not, how could I solve this problem? -- regards dib

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[git] automated update of superproject master branch
by Peter A. Bigot 14 Feb '14

14 Feb '14

I realize there are several email threads about how the super-project branch should be managed, but most pre-date live experience with boost on git and go deep into other aspects of the issue, so I still want to call this out specially: https://svn.boost.org/trac/boost/wiki/ModBigPicture specifies that the master branch on each module should be stable at all times, which is the right policy. Currently, the master branch on the super-project is automatically updated twice(?) per hour selecting all updates to the master branches of modules. Consequently, super-project master is the exact opposite of stable. This divergence is confusing. I'm unconvinced that waiting a few days will demonstrate a significant decrease in churn on the super-project master branch. Some is due to multiple updates to specific modules, which might decrease as maintainers become more familiar with git and only push once, but interoperability issues will still arise and there will be no way to tell which master branch commits produce a working Boost installation. There is value in having a branch with automated-update semantics, but IMO regardless of what the final policy will be, "master" is not the right choice for this, and automated updates of it should stop ASAP. Perhaps the update script can simply be moved to occur on latest/master and latest/develop. Leave master untouched until whatever gets committed to it has undergone cross-toolchain integration validation, and make develop available for changes to superproject content that are not just submodule updates. Peter

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General advice needed for new maintainers.
by Fletcher, John P 14 Feb '14

14 Feb '14

I have been maintaining Boost Phoenix for several weeks. To start with I was mainly attempting to fix as many bugs as possible and also sorting out things like missing copright and licence. I am now up to the more difficult bugs which take longer to fix. I also need some more information and some actions which I cannot take myself. I have asked about a number of these on this list and I am lacking answers to a good many of them, so I am going to summarise them here. I think it would be a great help to people undertaking maintenance for the first time, without having first been an originator of a library if some guidelines were in a document. 1. General guidelines on the responsibilities of a maintainer and who is responsible for the elements outside the developer's control. In particular, what happens when there is a release of boost? 2. General guidelines on the responsibilities for bugs and who to contact if a bug seems to be due to a different library. 3. Guidelines on the use of trac and how to get given the ability to record bugs as now fixed. 4. Where is the archive for boost-bugs? It would be useful to look at past fixes to find out what has gone on. Someone suggested searching but I cannot search until I know what is there. 5. A list of who is maintaining what. 6. Documentation. I am trying to get to grips with boostbook and quickbook. Some libraries are included in a section with indexed chapters and some are not. Is there a policy about this. When I asked how Phoenix could join the only reply I had was not to bother. Is there a documentation policy? It would be good to be able to generate the web pages myself to check them when I am making changes, which may be substantial. 7. More technical. How are things to be handled in relation to C++11. (a) Things which used to work which now don't with C++11? (b) Things which only work with C++11? (c) and what about C++14? I am fixing things in an adhoc way but it would be good to have a uniform approach. 8. Boost predef for version numbers. I have introduced this into Phoenix alongside the existing method. 9. Changelog. As a user I have found this useful in libraries I have used elsewhere, so I have put one into Phoenix following the style I found in wave. There is quite a lot here, but it has been building up for some time as I find I need more information to work effectively. John Fletcher P.S. Thanks to all those who have helped me get this far.

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Interested in working with Boost C++ Libraries
by Arpit Sharma 13 Feb '14

13 Feb '14

Hello, My name is Arpit Sharma. I'm a 3rd year Computer Science student. I'm very much interested to work for Boost C++ Libraries in Gsoc 2014 and would like to work after that also. Any pointers on how to proceed. -Thank you, Arpit Sharma

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Contributing to Boost as a part of GSoC 2014
by Kamal Gurala 13 Feb '14

13 Feb '14

Hi All, My name is Kamal Gurala, I am currently pursuing a B.tech in CSE from IIIT-Hyderabad ( India ). I have a good knowledge of C++, Data Structures, and Algorithms. I want to get started with contributing towards Boost. I would be obliged if any one could help me in this regard. Regards, Kamal Gurala

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[fusion.adapted.std_tuple] bug
by Hui Li 13 Feb '14

13 Feb '14

Looks like 2 files share the same include guard macro definitions. This makes it very hard to use Boost.Fusion for std::tuple's, especially if both boost::tuple and std::tuple need to be adapted. mbpro:fusion huil$ find . -type f |xargs grep -w BOOST_FUSION_CATEGORY_OF_IMPL_09272006_0726 ./adapted/boost_tuple/detail/category_of_impl.hpp:#if !defined(BOOST_FUSION_CATEGORY_OF_IMPL_09272006_0726) ./adapted/boost_tuple/detail/category_of_impl.hpp:#define BOOST_FUSION_CATEGORY_OF_IMPL_09272006_0726 ./adapted/std_tuple/detail/category_of_impl.hpp:#if !defined(BOOST_FUSION_CATEGORY_OF_IMPL_09272006_0726) ./adapted/std_tuple/detail/category_of_impl.hpp:#define BOOST_FUSION_CATEGORY_OF_IMPL_09272006_0726

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How to add a library to the BoostBook Documentation Subset?
by Fletcher, John P 12 Feb '14

12 Feb '14

I have taken over the task of maintaining Boost Phoenix. I want to start expanding the documentation which already uses Quickbook. The BoostBook Documentation Subset here includes a lot of libraries but not Boost Phoenix. http://www.boost.org/doc/libs/1_55_0/doc/html/index.html How do I get Boost Phoenix added, and are there any requirements for the documentation which need to be observed? Thanks John Fletcher

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Building a new boost library in Google summer program!
by Khaled Ammar 12 Feb '14

12 Feb '14

Hi everyone, I'm new to this list so please excuse my lack of experience. I'm interested to build a boost library as part of Google Summer of Code ( http://www.google-melange.com/gsoc/homepage/google/gsoc2014) Could you please advice me who should I contact? -- Thanks, -Khaled Ammar PhD student at Uwaterloo www.khaledammar.com

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Warning.. Regression testing changes forthcoming..
by Rene Rivera 12 Feb '14

12 Feb '14

We, mostly Ahmed Charles, will be moving the regression and release script code to independent git repos (i.e. moving the out of the boost super-repo). The first step is to copy the git histories. This requires that NO ONE make changes to the regression and release code. This first step will happen tonight at 8-12 pm PST. Further actions for testers to take will follow in the next 2-3 days. -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail

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Where is boost/detail/limits.hpp used?
by Peter Dimov 12 Feb '14

12 Feb '14

I'm playing with a dependency checker I wrote that tells me what Boost module depends on what. Starting with the basics: Dependencies for config: detail: boost/detail/endian.hpp A dependency from config to detail is not a good thing because detail depends on too much. boost/detail/endian.hpp is now only a forwarding header to predef, so it could and probably should be moved to predef, which seems to depend on nothing. But I was wondering what in config uses endian.hpp. Turns out the only use is in boost/detail/limits.hpp, a file that has been put into config for some reason. I can't find anything in config or in Boost that uses this file. What is its purpose?

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[Boost-users] User/Owner Information And in Boost File System
by MANTOSH KUMAR 12 Feb '14

12 Feb '14

Hi All, Point::1 ====== boost::filesystem library is great. However I found that boost::filesystem has no interface to fetch about the owner(userid/groupid) of a particular file. "stat()" system call has been provided by POSIX compliance system to fetch this information. I am pretty sure that this must have been thought by boost community while designing boost::filesystem library and there would be valid reason not to provide such interface. However I just wanted to know the thought of boost community. Point::2 ====== The following is the code snippet: std::vector<boost::filesystem::path> vec; boost::filesystem::recursive_directory_iterator rbgnitr(p); boost::filesystem::recursive_directory_iterator renditr; for(boost::filesystem::recursive_directory_iterator itr = rbgnitr; itr != renditr; ++itr) { v.push_back(*itr); } In the above "rbgnitr" does represent the starting node in a directory. However It looked bit strange while "renditr" for end node(one beyond end). The end node renditr" is basically empty instance of class "recursive_directory_iterator"......Just wanted to know why this was designed in this way..... Thanks & Regards, Mantosh Kumar India

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Boost.Log crash - question on consequences of misconfiguration
by Pieter 12 Feb '14

12 Feb '14

LS, My question regarding Boost.Log is the following: could anything been said on what to expect when asking Boost.Log to write to a non-existing directory on a read-only drive? Does it keep trying to write or give up when the directory cannot be created, and would the user be informed in such a case? Background: today I ran into a problem using Boost.Log. I configured both a Console and a TextFile backend (both autoflushing) but happened to configure the latter wrongly- setting the location of the file on a not-existing directory on a read-only drive. This caused a program crash under certain circumstances - but no problems under other circumstances (related to the configuration of the application which should not be relevant here) - when it did crash, this happened after a few messages were logged. Crash happened shortly before program termination but before the main() function was terminated (for a while I thought I was seeing the problem described in the docs regarding the boost.filesystem related problem and it took me a while to learn this was not the case). Pieter

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GSOC 2014
by Petru Trimbitas 12 Feb '14

12 Feb '14

Hello, I saw that boost took part in gsoc 2013, will it take part also in 2014? Thanks

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Boost.Mixin library preliminary reviews
by Borislav Stanimirov 11 Feb '14

11 Feb '14

Hello, Boost.Mixin is a library I'm developing and I intend to submit it for review by the end of the month (most likely on Feb, 23). Source is here: https://github.com/iboB/boost.mixin Docs are here: http://ibob.github.io/boost.mixin/ There have already been two discussion on the subject: here: http://lists.boost.org/Archives/boost/2013/01/200598.php and here: http://lists.boost.org/Archives/boost/2013/07/205184.php They showed at least moderate interest in the library. Also I had a lecture about the library back in November on Open Fest 2013 Bulgaria (Unfortunately it's in Bulgarian. If you understand Bulgarian, you can find it here http://www.youtube.com/watch?v=3sTX8lUdp1c ) The feedback from the lecture has been very positive. I'm going to complete the documentation in the following day or two (it's 90% done as of now) and then focus on docs polish, like typos, structure, etc, and fixing any bugs that might arise. The library is being used in two active closed source projects, so any major bugs are highly unlikely. Currently, apart from jamfiles, there are project files for Visual Studio 2008 and 2012, QtCreator, and Code::Blocks in the repo for your convenience. Before I submit it for a formal review, It would be great if I could have some preliminary ones. Anyone is welcome with questions, suggestions, tips, and comments Thanks, -- Borislav

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[predef] Error in sparc.h
by Adam Wulkiewicz 11 Feb '14

11 Feb '14

Hi, There is an error in predef/architecture/sparc.h (http://github.com/boostorg/predef/blob/develop/include/boost/predef/archite…) in line 40 the operand of && is missing. Should there be something added there or should the operator be deleted? Should I create a ticket? Regards, Adam

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[githelp] git pull --recurse-submodules equivalent?
by Rene Rivera 11 Feb '14

11 Feb '14

In trying to set up my ISP account to do testing report generation I ran into a rather old git version, 1.7.2.5. Which doesn't support the "--recurse-submodules" option of pull. What is the equivalent for a pre 1.7.3 git? -- -- Rene Rivera -- Grafik - Don't Assume Anything -- Robot Dreams - http://robot-dreams.net -- rrivera/acm.org (msn) - grafikrobot/aim,yahoo,skype,efnet,gmail

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Fwd: possible bug: retrieve data using associative property maps with boost::bimaps - failed
by Aniket Pugaonkar 10 Feb '14

10 Feb '14

Hi, I am not sure whether this email got sent to the list because I received an email that I have to subscribe to the list before asking any question through email. Apologies for sending it again. thanks! I am facing compilation error in the following code. I do understand why the error is, but I could not find a good solution. Here is my code and question explained in detail *What I want to do:* I want to store a key- value pair where both key and its respective values is unique. But After I create a map, I want to use the VALUE and get the corresponding key. Essentially the best way is a bimap. So I do the following using associative property maps. *What I did:* 1. define a bimap (my_bimap ) 2. define associative property map for left view of bimap ( right_asso_bimap ) 3. define associative property map for right view of bimap ( left_asso_bimap ) 4. fill the bimap using *left* view associative property map. i.e. *use boost::put( left_asso_bimap, key, value )* 5. Now using *right* view associative property map, retrieve key for given value i.e. use *boost::get( right_asso_bimap, value )* My main motive is to use GET and PUT helper functions for insertion and retrieval from a bimap. Use PUT to insert in LEFT BIMAP. and Use GET to retrieve from RIGHT BIMAP. I know the error is because of non-const-ness of the iterators because of which I cannot de-reference using iterators. But what would be the alternative to this ? This link here explains how to define parameters for bimap in order for iterators to be mutable. http://www.boost.org/doc/libs/1_55_0/libs/bimap/doc/html/boost_bimap/the_tu… *But I get the error below: * In file included from main.cpp:2:0: /usr/local/include/boost/property_map/property_map.hpp: In instantiation of 'boost::associative_property_map<UniquePairAssociativeContainer>::value_type& boost::associative_property_map<UniquePairAssociativeContainer>::operator[](const key_type&) const [with UniquePairAssociativeContainer = boost::bimaps::views::list_map_view<boost::bimaps::relation::member_at::right, boost::bimaps::detail::bimap_core<int, boost::bimaps::list_of<long unsigned int>, mpl_::na, mpl_::na, mpl_::na> > boost::associative_property_map<UniquePairAssociativeContainer>::reference = const int&; boost::associative_property_map<UniquePairAssociativeContainer>::value_type = const int; boost::associative_property_map<UniquePairAssociativeContainer>::key_type = long unsigned int]': /usr/local/include/boost/property_map/property_map.hpp:357:54: required from 'Reference boost::get(const boost::put_get_helper<Reference, PropertyMap>&, const K&) [with PropertyMap = boost::associative_property_map<boost::bimaps::views::list_map_view<boost::bimaps::relation::member_at::right, boost::bimaps::detail::bimap_core<int, boost::bimaps::list_of<long unsigned int>, mpl_::na, mpl_::na, mpl_::na> > > Reference = const int&; K = int]' main.cpp:41:35: required from here /usr/local/include/boost/property_map/property_map.hpp:502:20: error: no match for 'operator[]' (operand types are 'boost::associative_property_map<boost::bimaps::views::list_map_view<boost::bimaps::relation::member_at::right, boost::bimaps::detail::bimap_core<int, boost::bimaps::list_of<long unsigned int>, mpl_::na, mpl_::na, mpl_::na> > >::C {aka boost::bimaps::views::list_map_view<boost::bimaps::relation::member_at::right, boost::bimaps::detail::bimap_core<int, boost::bimaps::list_of<long unsigned int>, *mpl_::na, mpl_::na, mpl_::na> >}' and 'const key_type {aka const long unsigned int}')* *return (*m_c)[k];* ^ Here my code. You can also see the code here on this website link:* http://coliru.stacked-crooked.com/a/59cbf2c564bf22b2 <http://coliru.stacked-crooked.com/a/59cbf2c564bf22b2>* #include <boost/bimap.hpp> #include <boost/property_map/property_map.hpp> #include <boost/bimap/property_map/set_support.hpp>#include <boost/bimap/list_of.hpp>#include <iostream> using namespace boost; int main() {typedef int vertex_descriptor_t;namespace bm = boost::bimaps;typedef bm::bimap< vertex_descriptor_t, bm::list_of<size_t> > vd_idx_bimap_t;typedef boost::associative_property_map<vd_idx_bimap_t::left_map> Lasso_vd_idx_bimap_t;typedef boost::associative_property_map<vd_idx_bimap_t::right_map> Rasso_vd_idx_bimap_t; // define bimap and assoc prop map for itvd_idx_bimap_t my_bimap;Lasso_vd_idx_bimap_t Lmy_asso_bimap(my_bimap.left );Rasso_vd_idx_bimap_t Rmy_asso_bimap(my_bimap.right); typedef typename vd_idx_bimap_t::value_type value_type; my_bimap.insert( value_type( 1, 100 ) ); my_bimap.insert( value_type( 2, 200 ) ); int z = 1; std::cout << "value = " << get ( my_bimap.left, z ) << std::endl; // prints correctly value = 100 // use left asso bimap for inserting to bimap boost::put( Lmy_asso_bimap, 3, 300 ); // correct // print bimap using *left view*for(auto t = my_bimap.left.begin(); t != my_bimap.left.end(); ++t) std::cout << t->first << " " << t->second << "\n"; int y = 2;*z **= boost::get( Lmy_asso_bimap, y ); // CORRECT OUTPUT for left view * std::cout << "value = " << z << std::endl; // Use right asso bimap to get key based on supplied value y = 100;*z = boost::get( Rmy_asso_bimap, y );* *// -->> ERROR HERE for right view* std::cout << "value = " << z << std::endl; // print map again. (*right view*)for(auto t = my_bimap.right.begin(); t != my_bimap.right.end(); ++t) std::cout << t->first << " " << t->second << "\n"; } Please let me know whether this is a potential bug, or the code semantics is incorrect. Or the current library cannot support this. ? Regards, Aniket Pugaonkar -- Thanks and regards, Aniket Pugaonkar -- Thanks and regards, Aniket Pugaonkar -- Thanks and regards, Aniket Pugaonkar

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[GSOC] Generalized Hypergeometric Functions.
by Anton Bikineev 10 Feb '14

10 Feb '14

Hi all. I just added a quick and naive implementation of Pade approximation for 1f1 and 2f1 hypergeometric functions based on Luke's book. You can find code here: https://github.com/AntonBikineev/math/blob/hypergeometric/ include/boost/math/special_functions/detail/hypergeometric_pfq_pade.hpp I also want to thank Christopher Kormanyos for many advices and help. Best regards, Anton.

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Attn: We need GSoC 2014 mentors for Boost!
by Niall Douglas 10 Feb '14

10 Feb '14

Dear Boost community, We are now just five days away from the closing date for Google Summer of Code 2014 registration. Last year's GSoC was a huge success, with Google funding work on Boost to the tune of $35,000 and paying over $8,000 in costs for three representatives of Boost to attend the GSoC mentor's summit at Google HQ. As part of filling in our application for 2014, we must supply to Google a list of potential GSoC mentors and potential GSoC projects for summer 2014. We do NOT want a repeat of 2012 when our application was rejected due to an insufficiently long list of prospective mentors and projects! At the time of writing, we have just *eight* prospective mentors, and we need more to be sure of being approved by Google! Therefore, if you think yourself able to mentor a student doing some work on Boost this summer, *please* consider adding a description of the proposed work item and your name to the list at https://svn.boost.org/trac/boost/wiki/SoC2014. If you want to know more about mentoring a Google Summer of Code funded student work before you nominate yourself, please feel free to ask on the main Boost developers mailing list boost(a)lists.boost.org. Thank you in advance for your time. Niall Douglas (Boost Google Summer of Code admin) Boris Schäling (Boost Google Summer of Code backup admin)

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[program_options] comma separated options
by Alain Miniussi 10 Feb '14

10 Feb '14

Hi, Someone asked me if it was possible to "easily" specify an option that would allow to specify a vector of values. The first options that came in mind was to use "multitoken". But that solution had to drawback in that situation: - ambiguous with respect to positional parameters - clumsy when you want to allow options to be specified in files, since you have to write: option 12 option 42 ... instead of: option 12 42 19 So I though about using a custom validator, which implies introducing a new type too, if I understand correctly. Something along the lines of: ======================= ... template<typename T> struct option_sequence { std::vector<T> values; }; template<typename T> void validate(boost::any& v, const std::vector<std::string>& values, option_sequence<T>* target_type, int) { namespace po = boost::program_options; namespace alg = boost::algorithm; std::vector<T> result; typedef std::vector<std::string> strings; for ( strings::const_iterator iter = values.begin(); iter != values.end(); ++iter ) { strings tks; alg::split(tks, *iter, alg::is_any_of(":")); for( strings::const_iterator tk = tks.begin(); tk != tks.end(); ++tk) { result.push_back(boost::lexical_cast<T>(*tk)); } } v = option_sequence<T>(); boost::any_cast<option_sequence<T>&>(v).values.swap(result); } int main(int argc, char* argv[]) { .... desc.add_options() ("values,v", po::value<option_sequence<int> >(), "a vector of ':' separated values as in \"12:42:-20\"."); =================== Obviously, one could think that some flexibility could be added (separators for starters) but you get the idea. Is that the right way to go (the intermediate option_sequence template seems clumsy for the user (but you need to distinguish from std::vector's) and if yes, could such a thing be added to the library ? (if yes a could propose a patch for consideration). Cheers -- ===================================== Alain Miniussi DSI/Pôle Génie Logiciel Scientifique Observatoire de la Côte d'Azur

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