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Re: [boost] Interest in a container which can hold multiple data types?
by James Armstrong 05 May '15

05 May '15

On 5/5/2015 7:49 PM, Joaquin M Lopez Munoz wrote: > TONGARI J <tongari95 <at> gmail.com> writes: > >> If the data sequence shows some affinity, I guess an ordered >> tuple_vector-based sequence can provide some performance benefit in >> traversal (with some crafted for_each method). >> >> That is, a sequence of [AAABBB] may be traversed faster than [ABABAB] for >> such a container, and I believe in the later case such that the types are >> uniformly distributed, vector<variant> will perform better. > I wrote something on this some time ago, maybe worth having a look at: > > http://bannalia.blogspot.com/2014/05/fast-polymorphic-collections.html > http://bannalia.blogspot.com/2014/05/fast-polymorphic-collections-with.html > Nice analysis. If we can identify different use cases, we may be able to come up with several implementations of heterogeneous containers which balance efficiency and flexibility. I think it would be an interesting project to work on and surely useful if the containers all the a similar 'feel' -- James Armstrong

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[filesystem] copy_file compilation error
by Rob Conde 05 May '15

05 May '15

In boost 1.55 the following code compiled file on visual studio 2013 and g++ 4.4.7: #include "boost/filesystem/operations.hpp" void myFunc() { using namespace boost::filesystem; copy_option opt(copy_option::overwrite_if_exists); copy_file(path("p1"),path("p2"),opt); } in boost 1.58 I get the following error on g++ 4.4.7 (Visual Studio 2013 continues to work): test.cpp: In function 'void myFunc()': test.cpp:9: error: no matching function for call to 'copy_file(boost::filesystem::path, boost::filesystem::path, boost::filesystem::copy_option&)' boost/filesystem/operations.hpp:494: note: candidates are: void boost::filesystem::copy_file(const boost::filesystem::path&, const boost::filesystem::path&, boost::filesystem::copy_option::enum_type) boost/filesystem/operations.hpp:500: note: void boost::filesystem::copy_file(const boost::filesystem::path&, const boost::filesystem::path&) boost/filesystem/operations.hpp:505: note: void boost::filesystem::copy_file(const boost::filesystem::path&, const boost::filesystem::path&, boost::filesystem::copy_option::enum_type, boost::system::error_code&) boost/filesystem/operations.hpp:511: note: void boost::filesystem::copy_file(const boost::filesystem::path&, const boost::filesystem::path&, boost::system::error_code&) is this a bug in filesystem on gcc, a bug in gcc, a non-standard behavior in visual studio 2013, or an intended change? Rob Conde

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Re: [boost] Description of pre-requisites for building Boost 1.58.0?
by Marko Asplund 05 May '15

05 May '15

On 2015-04-24 22:17:55 Ben Pope wrote: > This doesn't really answer the question, but as a practical note, you > can do: > sudo apt-get build-dep libboost* > Which will install the build dependencies for the version of Boost in > your repository, rather than the version you're trying to build, but it > should get you where you want to be most of the time. FYI, I submitted a documentation pull request for adding a short section about pre-requisite software installation: https://github.com/boostorg/boost/pull/78 marko

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Another variant type (was: [peer review queue tardiness] [was Cleaning out the Boost review queue] Review Queue member requirements)
by Nevin Liber 05 May '15

05 May '15

On 2 April 2015 at 08:13, Niall Douglas <s_sourceforge(a)nedprod.com> wrote: > I > was recently working with eggs.variant for example, and that is Boost > quality written to Boost guidelines and yet I understand there is > zero interest in it entering Boost, despite it being superior to > Boost.Variant in almost every way. I don't remember anyone asking if they'd like to see this in Boost. Could you point to a thread? Even though you claim it is superior in almost every way, if I'm reading it correctly it has one fundamental difference in that it models "at-most-one-of" vs. Boost.Variant which models "exactly-one-of". And yes, I would like to see it in Boost, because as variant gets proposed for the standard, it would be better to have a lot more user experience to help us decide that fundamental question. That certainly fits the current mission in that "We aim to establish 'existing practice' and provide reference implementations so that Boost libraries are suitable for eventual standardization." -- Nevin ":-)" Liber <mailto:nevin@eviloverlord.com> (847) 691-1404

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Interested in contributing
by suryansh tiwari 05 May '15

05 May '15

Hey I'm new, but I'd like to contribute to your organisation, can someone please guide me along? I have done some good amount of competetive programming in c++ and I am completely new to open source.

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Re: [boost] Interest in a container which can hold multiple data types?
by James Armstrong 05 May '15

05 May '15

So, as it is currently implemented, it doesn't actually make use of boost::any or boost::variants. I used a deque<void*> to store addresses of the data, and deque<boost::core::typeinfo> to store the data types. Therefore, iterating through the container to get the data for datatype T simply involves iterating through the deque<boost::core::typeinfo> until a type match is found, then casting the void* to a T* for the corresponding index. There are definitely different ways to take the idea, and maybe there is use for multiple types of heterogeneous containers. The way this container is setup has the advantage (depending on your viewpoint) that you do not have to explicit declare what data types the container will store up front. This could be useful in some context where, for instance, you are pulling information from a database where you don't quite know up front whether certain fields will be numeric or character data until you've queried the db. This container can allow you to pop in whatever data-type the result is, without having to explicitly list out every possibility up front. -- James Armstrong

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[predef] Boost build errors using predef-check
by Edward Diener 04 May '15

04 May '15

In my jam file I have: import ../../predef/check/predef : check require : predef-check predef-require ; and in the requirments section of various Boost Build built-in rules I have: [ predef-check "BOOST_COMP_GNUC >= 4.3" : <cxxflags>-std=c++0x ] When I try to process my jamfile I get numerous warnings along the line of: > C:/Programming/VersionControl/modular-boost/libs/vmd/test\../../predef/check/pre > def.jam:61: in predef-check > warning: object is empty > Jamfile.v2:51: in modules.load > C:/Programming/VersionControl/modular-boost/tools/build/src/build\project.jam:32 > 5: in load-jamfile > C:/Programming/VersionControl/modular-boost/tools/build/src/build\project.jam:64 > : in load > C:/Programming/VersionControl/modular-boost/tools/build/src/build\project.jam:14 > 5: in project.find > C:/Programming/VersionControl/modular-boost/tools/build/src\build-system.jam:535 > : in load > C:\Programming\VersionControl\modular-boost\tools\build\src/kernel\modules.jam:2 > 89: in import > C:\Programming\VersionControl\modular-boost\tools\build\src/kernel/bootstrap.jam > :139: in boost-build > C:\Programming\VersionControl\modular-boost\boost-build.jam:17: in module scope > C:/Programming/VersionControl/modular-boost/libs/vmd/test\../../predef/check/pre > def.jam:61: in predef-check > warning: object is empty > Jamfile.v2:52: in modules.load followed eventually by: > C:\Programming\VersionControl\modular-boost\boost-build.jam:17: in module scope > Performing configuration checks > > - 32-bit : yes (cached) > - arm : no (cached) > - mips1 : no (cached) > - power : no (cached) > - sparc : no (cached) > - x86 : yes (cached) > - symlinks supported : yes > C:/Programming/VersionControl/modular-boost/tools/build/src/kernel\modules.jam:1 > 07: in modules.call-in > *** argument error > * rule ../../predef/check/predef.predef_check_action ( targets + : sources + : p > rops * ) > * called with: ( <p..\..\..\bin.v2\check\predef\gcc-mingw-4.9.2\debug\address-mo > del-32\architecture-x86>8bab483dffdbedc6438ba8af0f25a37e.txt : : <abi>ms <actio > n>@../../predef/check/predef%../../predef/check/predef.predef_check_action <addr > ess-model>32 <architecture>x86 <asynch-exceptions>off <auto-index-internal>off < > auto-index-no-duplicates>off <auto-index-section-names>on <auto-index-verbose>of > f <auto-index>off <binary-format>pe <debug-store>object <debug-symbols>on <doxyg > en.doxproc.index>no <doxygen.processor>xsltproc <embed-manifest>on <exception-ha > ndling>on <extern-c-nothrow>off <format>html <hardcode-dll-paths>true <host-os>w > indows <inlining>off <install-dependencies>off <link>shared <log-api>generic <mi > dl-robust>yes <midl-stubless-proxy>yes <optimization>off <os>NT <pch>on <predef- > expression>BOOST_COMP_GNUC >= 4.3 <preserve-test-targets>on <profiling>off <pyth > on-debugging>off <python.interpreter>C:/Utilities/Python278_32\python <python>2. > 7 <rtti>on <runtime-debugging>on <runtime-link>shared <stdlib>native <strip>off > <suppress-import-lib>false <symlink-location>project-relative <target-os>windows > <testing.execute>on <threadapi>win32 <threading>single <toolset-gcc:flavor>ming > w <toolset-gcc:version>4.9.2 <toolset>gcc <user-interface>console <variant>debug > <warnings-as-errors>off <warnings>on <windows-api>desktop : : : : : : : > : : : : : : : : ) > * missing argument sources > C:/Programming/VersionControl/modular-boost/libs/vmd/test\../../predef/check/pre > def.jam:99:see definition of rule '../../predef/check/predef.predef_check_action > ' being called > C:/Programming/VersionControl/modular-boost/tools/build/src/util\indirect.jam:98 > : in indirect.call > C:/Programming/VersionControl/modular-boost/tools/build/src/build\virtual-target > .jam:798: in class(a)action.actualize > C:/Programming/VersionControl/modular-boost/tools/build/src/build\virtual-target > .jam:311: in actualize-action etc. Any ideas of what is wrong ? Without the use of predef-check everything is OK. I have the latest 'develop' for predef and Boost build. I am trying to set gcc in c++11 mode for gcc 4.3 on up in my VMD tests.

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[predef] Using predef-require with OR conditions
by Edward Diener 04 May '15

04 May '15

In a jamfile I would like to use predef-require in OR situatuations so that if any particular predef-definition is true my unit testing rule occurs, else it does not occur: import ../libs/predef/check/predef : require : predef-require ; run some_test.cpp : : : BOOST_COMP_SOME_COMPILER >= n.n.n || other_predef_definiion ; The typical use case for this is to have a unit test for particular version(s) of a compiler or for all other versions of other compilers. Is this possible ?

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[afio] Trouble with examples
by Brian Ravnsgaard Riis 03 May '15

03 May '15

Hi, The first two examples for the AFIO library do not work as written. The "Hello World" example is missing a file_flag::Create[OnlyIfNotExist] flag on the "example_file.txt" op. Otherwise it never creates the file and the rest of the example becomes garbage. The "less toy" example has a bug in the parsing of the input files. It loops, incrementing argc instead of n, as it should. Even after that I cannot get the program to work, and I am unsure exactly what is wrong. The output file for the concatenated inputs is created and "truncated" to the correct size, but no data ever gets written to this file. If I use large files I have seen std::invalid_argument exceptions and even segfaults. I *think* the problem may be related to the buffers; I have tried using a simple std::vector<char> for the file_buffer_type, but this makes no difference. I have not looked at any other examples yet; I think I should get these two working correctly first... Regards, Brian

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Guidance on contributing to BOOST
by Rohith R 03 May '15

03 May '15

Hey All I am Rohith R, a budding developer from BITS Pilani University in India. Having used a lot of libraries from the STL and BOOST of C++ for my work as an application programmer and some data science projects, i wanted to contribute to BOOST by writing some code for it. I also have experience in writing low-level code for Operating Systems and I have written some basic drivers for raspberry pi as well. I want some guidance on this as to where should i start from and on what area should I focus my library on. This is a small implementation of vector i made just for fun. https://github.com/MadaraUchiha-314/Data-Structures-Library/blob/master/Vec… Any kind of help would be appreciated. Thanks A Lot Rohith R

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[function_types] Pull request for library in 'develop'
by Edward Diener 02 May '15

02 May '15

Is there a maintainer for the function_types library ? Tobias Schwinger is listed as the maintainer but I do not believe he has been active in Boost for a long time. I have a pull request for the library. Can someone who has administrative rights for the library please look at it ?

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Re: [boost] Official JSON Package
by Michael Ainsworth 01 May '15

01 May '15

> Is there an official Boost package for reading and writing JSON data? >> >> Not on Boost, I would suggest you the RapidJSON. >> Do not use boost PropertyTree since you will face incompatibilities mainly >> with arrays. Given that JSON is a de-facto standard (along the lines of INI files and the like) would an official addition as a boost library be considered?

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Official JSON Package
by Michael Ainsworth 01 May '15

01 May '15

Is there an official Boost package for reading and writing JSON data? I know of JSON Spirit, but this is not (to my knowledge) official. I also know the Boost.PropertyTree works, but doesnot have full support. Michael

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[date_time] default constructor for period?
by Scott Bailey 01 May '15

01 May '15

I would like to use this: std::deque<boost::posix_time::time_period> But std::deque depends on (as does some of my other code) it's type having a default constructor. I'm surprised it does not already exists. An implementation that seems to work for me is trivial, although I'm not sure it will work for everyone? My changes to 'boost/date_time_time_period.hpp' follow. I have guarded them with DATE_TIME_NO_DEFAULT_CONSTRUCTOR and simply set begin to point_type() and end to begin_ -1; Is this a change worth an eventual release? Thanks, SB --- a/period.hpp 2015-04-29 15:13:28.040930833 -0700 +++ b/period.hpp 2015-04-29 15:15:01.201392793 -0700 @@ -57,6 +57,9 @@ typedef point_rep point_type; typedef duration_rep duration_type; +#if !defined(DATE_TIME_NO_DEFAULT_CONSTRUCTOR) + period(); +#endif // DATE_TIME_NO_DEFAULT_CONSTRUCTOR period(point_rep first_point, point_rep end_point); period(point_rep first_point, duration_rep len); point_rep begin() const; @@ -82,6 +85,16 @@ point_rep last_; }; +#if !defined(DATE_TIME_NO_DEFAULT_CONSTRUCTOR) + //! default constructor + template<class point_rep, class duration_rep> + inline + period<point_rep,duration_rep>::period() : + begin_(point_type()), + last_(begin_ - duration_rep::unit()) + {} +#endif // DATE_TIME_NO_DEFAULT_CONSTRUCTOR + //! create a period from begin to last eg: [begin,end) /*! If end <= begin then the period will be invalid */ -- Scott Bailey

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[property_tree] Co-Maintainer Needed
by Sebastian Redl 01 May '15

01 May '15

H List, It pains me to say that I can't find sufficient time to maintain PropertyTree the way I should. Bugfixes are delayed, regressions appear, and the long-needed documentation improvement is going nowhere. I made a commitment last C++Now to add C++11 support and document the way I did it in order to help other Boost developers, and failed to do so. New features, like proper encoding support or type-preserving JSON parsing simply aren't happening. It's clear that I can't do it alone. So I am looking for help, someone else who cares about the library and can help me with bugfixes and future development. This could be an individual, a group of people, or the community maintenance team, but I definitely need someone if PropertyTree is supposed to continue as a useful part of Boost. Anyone interested or know somebody who would be interested, please let me know. Sebastian

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Re: [boost] Official JSON Package
by John Venarchick 01 May '15

01 May '15

> > ---------- Forwarded message ---------- > From: Michael Ainsworth <michael(a)michaelainsworth.id.au> > To: "boost(a)lists.boost.org" <boost(a)lists.boost.org> > Cc: > Date: Fri, 1 May 2015 08:53:02 +1000 > Subject: [boost] Official JSON Package > Is there an official Boost package for reading and writing JSON data? > > I know of JSON Spirit, but this is not (to my knowledge) official. I also > know the Boost.PropertyTree works, but doesnot have full support. > > Michael About two years ago when there was talk of a GSOC 2013 project for JSON, I posted that I had been working on changes to ptree so that you could have a ptree<string, boost::any> and be able to round trip successfully. At the time no one seemed interested. I think I should be able to recreate what I had done to make it work for you if your use case is DOM centric like Bjorn Reese's post indicates is one of the draw backs of using ptree. -John Venarchick

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[ANN] "Die Boost C++ Bibliotheken", 2nd edition available (German edition)
by Boris Schäling 01 May '15

01 May '15

Just a quick announcement: The 2nd edition of my book "Die Boost C++ Bibliotheken" (German edition) is available. - It introduces 72 Boost libraries. - It contains more than 430 examples. - The print version has 600 pages. - There is also a Kindle, Epub and PDF version. - It's also online: <http://dieboostcppbibliotheken.de/> There is hardly any difference between the German and the English language edition. The German language edition is a bit more up-to-date after the English language edition has been published in September last year. But there is no need to read the book again in case you read the English language edition already. For those who don't know German: The English language edition remains available online at <http://theboostcpplibraries.com/>. Boris

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[CrystaX.NET][multi_index][release] Segfaults with Clang 3.5 on Android
by Joaquin M Lopez Munoz 01 May '15

01 May '15

Hi, Android CrystaX.NET-* testers are segfaulting on some (~65%) of the Boost.MultiIndex tests after successful build. For instance: http://tinyurl.com/jwnfryy The curious thing is that this is Clang 3.5 only, only for some tests and the same tests across the different Android variants. I'd like to help fixing whatever it's required (if anything) in the lib so as to make this work, but the existing info does not provide any clue. Maybe the regression tester maintainer can shed some more light here? Thank you, Joaquín M López Muñoz Telefónica

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[1.58.0] Release candidates available
by Marshall Clow 01 May '15

01 May '15

Release candidate files for 1.58.0 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_58_0_rc1.7z) = 609ea035fd3b9f1da110f640c9b8d1e6 MD5 (boost_1_58_0_rc1.tar.bz2) = 7edf680e2532a0370bce64e8e847d661 MD5 (boost_1_58_0_rc1.tar.gz) = 0e435db6a5963e58ffa8d7df49ab5846 MD5 (boost_1_58_0_rc1.zip) = a8d1761306a2ea020e92de53a5cae82d Thanks! -- The release managers P.S. Release notes are here: http://www.boost.org/users/history/version_1_58_0.html

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[1.58.0] Adding Oracle Solaris Studio 12.4 to the list of tested compilers
by Aparna Kumta 01 May '15

01 May '15

One of our primary goals has been to get Oracle Solaris Studio C++ compiler listed on the boost website. With this mind, we have been testing the Boost Nightly regression tests for few months now. For the past month have been submitting the results on http://www.boost.org/development/tests/develop/developer/summary.html (look for the SunOS tab). Could the Oracle Solaris Studio C++ compiler be added to the boost website under 'COMPILERS TESTED' section at http://www.boost.org/users/history/version_1_58_0.html ? Thanks, Aparna

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[githelp] Moving from push to pull requests
by Fletcher, John P 30 Apr '15

30 Apr '15

I have been working for some time on boost phoenix using git push origin develop to push my changes. I have now been asked to change to use pull requests and I am not clear about how to get into the new setup. My current setup on my local computer has phoenix as a subproject in a complete boost clone with branches develop, master and several other branches. I have not created any branches on the remote repository. What I want is to have a repository where I can work and then send pull requests for things to go to the main develop. I have two ideas about how this could be done. (1) create a separate repository outside the modular structure and put a copy of phoenix there. I have created an empty structure called phoenix_changes both on my local computer and under my user name on github. I am puzzled as to how to get the correct content into it. This could come from my local copy or from the main repository. (2) Should I instead create a new branch in both my local and the remote copies of boost/phoenix? If so how do I do that? Can I branch from the current develop as the starting point? In either case I want to be able to send pull requests to the other developers. It would be helpful to have an example of the commands needed. Please ask me for more information if this is not clear. Thank you for the [githelp] resource. John

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[Boost] Windows 10 Building/Testing
by Kyle Ketterer 30 Apr '15

30 Apr '15

Hey all, I was just curious if any devs/users have tried to compile/build on any of the Windows 10 preview releases and if there is a plan to support moving forward. I have been using Boost in various projects for 4-5 years and I am actually interested in getting involved in this project somehow. What is the most appropriate way to become involved? I really appreciate the skill level here and if anything would love the learning experience (learning from the best). Thanks

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[gsoc15] This year's GSoC students
by Niall Douglas 29 Apr '15

29 Apr '15

Dear Boost, It is our pleasure to announce this year's winning GSoC students and projects: 1. Damian Vicino Topic: Safe Float (boost::safe_numerics<float>) Mentor: Robert Ramey 2. Rajaditya Mukherjee Topic: Boost uBLAS EigenSolver Mentor: David Bellot 3. Anurag Ghosh Topic: Boost Document Library Mentor: Antony Polukhin 4. Nikhar Agrawal Topic: Boost.Fixed-Point Mentor: Paul A. Bristow 5. Benedek Thaler Topic: Enhanced vector and deque containers Mentor: Thorsten Ottosen 6. Louis Dionne Topic: Improved compile-time associative data structures for Hana Mentor: Joel Falcou 7. Jakub Szuppe Topic: Improving Boost.Compute Mentor: Kyle Lutz Congratulations to these students for passing an exceptionally tough contest this year, and our thanks to the above mentors for making themselves available. Finally, thank you Google for another year of funding and to those open source orgs who released duplicate students to us, we appreciate it! Niall and Boris --- Boost C++ Libraries Google Summer of Code 2015 admin https://svn.boost.org/trac/boost/wiki/SoC2015

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Updated library_status for easier use..
by Rene Rivera 29 Apr '15

29 Apr '15

Following up on the reorganization of the regression tools.. I'm happy to say that part of the changes I pushed last night include a cleaned up and easier to use library_status tool. Key changes, from the older version and the one Robert forked, are: * Processing the jam log (i.e. process_jam_log) is integrated into it. * Running b2 to build/run tests is also integrated into it (optionally). Which means that there's no external support script(s) needed and that it's fully cross-platform single executable. Documentation is updated at < https://rawgit.com/boostorg/regression/develop/index.html> on how to build it and on using it at < https://rawgit.com/boostorg/regression/develop/library_status/doc/library_s… >. Obviously improvements from others welcome (as PRs). HTH -- -- 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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[trac] Internal error
by Edward Diener 28 Apr '15

28 Apr '15

I logged into Boost trac and received: " Trac detected an internal error: OperationalError: database is locked There was an internal error in Trac. It is recommended that you notify your local Trac administrator with the information needed to reproduce the issue. To that end, you could a ticket. The action that triggered the error was: GET: /login"

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