June 2014 - Boost - lists.preview.boost.org

Boost.Python and __slots__
by Matt Calabrese 26 Jun '14

26 Jun '14

Does something special need to be done to setup __slots__ on a class bound via Boost.Python? I can set __slots__ on the class and verify that it can be accessed from python, however I am still able to set members that aren't in the __slots__ list. -- -Matt Calabrese

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How to handle generated html files with modular-boost and GIT?
by Paul A. Bristow 26 Jun '14

26 Jun '14

I've started to proof-read Vladimir Batov's Boost.Convert library and correct a (very few) typos etc. I've had some troublesome experience with building docs with Boost.Math and this is similar (but much smaller). Can experienced GIT users suggest how better to handle the problem of generated files in the /html folder. I've provided below a log of what I've done after a single edit to a Quickbook file. As you will see, there are *new* files (with randomized filenames) html/boost/convert_id274115.html html/boost/convert_id274279.html html/boost/convert_id277698.html html/boost/convert_id277857.html (and also my log file cv_20jun14_1135.log) And all the .html file have been modified. So what do I do? I'd hope just to be able to GIT commit (but there will be added files so "git commit -a") and "git push". (But what about obsolete files like html/boost/convert_id999999.html that should be deleted?) . This seems a muddle, so should we remove the /html folder from GIT using gitignore? However this would mean that users would have to generate the html (and assumes that all the tools like Doxygen and autoIndex are setup right - an unwelcome requirement). And what about .log files - it seems very useful and reasonable to have them live in /doc but be ignored by GIT? Could/Should there be a global entry in top level /modular-boost/.gitignore to exclude all .log files? (I'd also like to put .bat or .sh files to build docs etc here too - there are various options in building and automatically dated log files are nice to have. ) Suggestions on how better to manage this? Paul I:\modular-boost>cd ./libs/convert/doc I:\modular-boost\libs\convert\doc>dir Volume in drive I is Boost Volume Serial Number is FAC6-FCC3 Directory of I:\modular-boost\libs\convert\doc 19-Jun-14 18:07 <DIR> . 19-Jun-14 18:07 <DIR> .. 19-Jun-14 18:07 1,413 00_main.qbk 19-Jun-14 18:07 28 98_ref.qbk 19-Jun-14 18:07 16 99_index.qbk 19-Jun-14 18:07 1,158 acknowledgments.qbk 19-Jun-14 18:07 175 algorithms.qbk 19-Jun-14 18:07 1,729 converters.qbk 19-Jun-14 18:07 17,528 convert_ref.xml 19-Jun-14 18:07 10,730 design_notes.qbk 19-Jun-14 18:07 133 generate-html.sh 19-Jun-14 18:07 2,337 getting_serious.qbk 19-Jun-14 18:07 2,848 getting_started.qbk 19-Jun-14 18:07 <DIR> html 19-Jun-14 18:07 357 index.idx 19-Jun-14 18:07 2,601 introduction.qbk 19-Jun-14 18:07 3,060 Jamfile.v2 19-Jun-14 18:07 1,254 lexcast_converter.qbk 19-Jun-14 18:07 1,228 other.qbk 19-Jun-14 18:07 8,427 performance.qbk 19-Jun-14 18:07 1,789 rationale.qbk 19-Jun-14 18:07 220 references.qbk 19-Jun-14 18:07 1,627 return_value.qbk 19-Jun-14 18:07 5,431 scratchpad.txt 19-Jun-14 18:07 4,372 sstream_converter.qbk 22 File(s) 68,461 bytes 3 Dir(s) 99,253,600,256 bytes free I:\modular-boost\libs\convert\doc>b2 -a --enable-index > cv_20jun14_1135.log I:\modular-boost\libs\convert\doc>git status On branch develop Your branch is up-to-date with 'origin/develop'. Changes not staged for commit: (use "git add <file>..." to update what will be committed) (use "git checkout -- <file>..." to discard changes in working directory) modified: convert_ref.xml modified: html/boost/cnv/adapter.html modified: html/boost/cnv/base.html modified: html/boost/cnv/basic_stringstream.html modified: html/boost/cnv/lexical_cast.html modified: html/boost/cnv/notation.html modified: html/boost/cnv/printf.html modified: html/boost/cnv/spirit.html modified: html/boost/cnv/strtol.html modified: html/boost/throw_on_failure.html modified: html/boost/throw_on_failure_type.html modified: html/boostbook.css modified: html/convert_reference.html modified: html/docutils.css modified: html/header/boost/convert/lexical_cast_hpp.html modified: html/header/boost/convert/parameters_hpp.html modified: html/header/boost/convert/printf_hpp.html modified: html/header/boost/convert/spirit_hpp.html modified: html/header/boost/convert/sstream_hpp.html modified: html/header/boost/convert/strtol_hpp.html modified: html/header/boost/make_default_hpp.html modified: html/index.html modified: html/index/s17.html modified: html/minimal.css modified: html/standalone_HTML.manifest modified: html/the_boost_convert_library/acknowledgements.html modified: html/the_boost_convert_library/better_error_detection.html modified: html/the_boost_convert_library/boost__lexical_cast_based_converter.html modified: html/the_boost_convert_library/boost_convert_performance_overhead.html modified: html/the_boost_convert_library/boost_convert_with_standard_algorithms.html modified: html/the_boost_convert_library/converters.html modified: html/the_boost_convert_library/design_notes.html modified: html/the_boost_convert_library/design_notes/converter_signature.html modified: html/the_boost_convert_library/design_notes/todo_converter_parameter_related_con siderations__explicit__default__globally_set__others_.html modified: html/the_boost_convert_library/design_notes/todo_converter_pluggability.html modified: html/the_boost_convert_library/design_notes/user_interface_signature.html modified: html/the_boost_convert_library/getting_started.html modified: html/the_boost_convert_library/getting_started/basic_error_processing.html modified: html/the_boost_convert_library/getting_started/flexibility_and_adaptability_to_c hange.html modified: html/the_boost_convert_library/introduction.html modified: html/the_boost_convert_library/other_conversions.html modified: html/the_boost_convert_library/performance.html modified: html/the_boost_convert_library/references.html modified: html/the_boost_convert_library/return_value.html modified: html/the_boost_convert_library/std__stringstream_based_converter.html modified: html/the_boost_convert_library/std__stringstream_based_converter/integration_of_ user_defined_types.html modified: html/the_boost_convert_library/std__stringstream_based_converter/locale_support. html modified: html/the_boost_convert_library/std__stringstream_based_converter/the___default_c onstructible__type_requirement.html modified: introduction.qbk Untracked files: (use "git add <file>..." to include in what will be committed) cv_20jun14_1135.log html/boost/convert_id274115.html html/boost/convert_id274279.html html/boost/convert_id277698.html html/boost/convert_id277857.html html/boost/convert_id285317.html html/boost/convert_id285442.html no changes added to commit (use "git add" and/or "git commit -a")

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ptr_vector requiring non-const iterator for insert
by Florian Burkart 26 Jun '14

26 Jun '14

Hi, I noticed that ptr_vector requires a non-const iterator for insert. This is inherited from ptr_sequence_adapter, which defines iterator insert( iterator position, T* x ); Under C++11, this differs from std::vector, which, since C++11, is happy to take const_iterators. iterator insert( const_iterator pos, const T& value ); I read somewhere that C++11 was attempting to clear up some confusion in the standard between iterator constness and container constness. Just wondering whether this should be adopted (e.g. changed) in ptr containers. Gave me an error when I switched from vector to ptr_vector in a drop-in fashion. Not sure whether that is already planned, but google didn't find anything. Florian

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[parameter] 'develop' branch breaks tests with VC++
by Edward Diener 25 Jun '14

25 Jun '14

In testing out potential changes in Boost PP against other Boost libraries, to make sure those changes break no code, I noticed that running tests in the Boost parameter 'develop' branch against VC++ ( msvc-12.0 ) creates a number of compiler errors related to Boost PP. These errors in my tests look odd and I cannot figure out from what source they are happening: ...failed compile-c-c++ ..\..\..\bin.v2\libs\parameter\test\literate\predicate-requirements0.test\msvc-12.0\debug\threading-multi\predicate-requirements0.obj... compile-c-c++ ..\..\..\bin.v2\libs\parameter\test\literate\handling-out-parameters0.test\msvc-12.0\debug\threading-multi\handling-out-parameters0.obj handling-out-parameters0.cpp /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2121: '#' : invalid character : possibly the result of a macro expansion /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PP_IIF_BOOST_PP_BOOL_0' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : see reference to class template instantiation 'boost_param_params_649f<BoostParameterDummy>' being compiled /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2146: syntax error : missing ',' before identifier 'BOOST_PP_IIF_BOOST_PP_BOOL_BOOST_PP_DEC_BOOST_PP_SEQ_SIZE_required' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'graph' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2059: syntax error : ')' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PP_TUPLE_EAT_2' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C3861: 'BOOST_PP_IIF_BOOST_PP_BOOL_BOOST_PP_DEC_BOOST_PP_SEQ_SIZE_required': identifier not found /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PARAMETER_FLATTEN_SPEC' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C3861: 'required': identifier not found /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2143: syntax error : missing ',' before ')' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C3861: 'vertices': identifier not found /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C3861: 'get': identifier not found /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'index_map' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C3861: 'default_color_map': identifier not found /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C3861: 'num_vertices': identifier not found /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PP_TUPLE_EAT_4' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'line' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2143: syntax error : missing ',' before 'constant' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2143: syntax error : missing ',' before 'string' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'visitor' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2059: syntax error : ',' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C3861: 'optional': identifier not found /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PP_SEQ_FOR_EACH_P' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PP_SEQ_FOR_EACH_O' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PP_SEQ_FOR_EACH_M' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PARAMETER_FUNCTION_PARAMETERS_M' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2882: 'tag' : illegal use of namespace identifier in expression /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PP_SEQ_TAIL_I' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PP_SEQ_FOR_EACH_I_P' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PP_SEQ_FOR_EACH_I_O' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'BOOST_PP_SEQ_FOR_EACH_I_M' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2977: 'boost::parameter::parameters' : too many template arguments C:\Programming\VersionControl\modular-boost\boost/parameter/parameters.hpp(715) : see declaration of 'boost::parameter::parameters' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2955: 'boost::parameter::parameters' : use of class template requires template argument list C:\Programming\VersionControl\modular-boost\boost/parameter/parameters.hpp(715) : see declaration of 'boost::parameter::parameters' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2146: syntax error : missing ';' before identifier 'BOOST_PP_IIF_BOOST_PP_BOOL_BOOST_PP_IIF_BOOST_PP_BOOL_0' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2146: syntax error : missing ';' before identifier 'BOOST_PP_IIF_BOOST_PP_BOOL_BOOST_PP_DEC_BOOST_PP_SEQ_SIZE_required' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2899: typename cannot be used outside a template declaration /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2065: 'Args' : undeclared identifier /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2923: 'boost_param_result_649f' : 'Args' is not a valid template type argument for parameter 'Args' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2955: 'boost_param_result_649f' : use of class template requires template argument list /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : see declaration of 'boost_param_result_649f' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2143: syntax error : missing ';' before '{' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2447: '{' : missing function header (old-style formal list?) /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2146: syntax error : missing ',' before identifier 'BOOST_PP_IIF_BOOST_PP_BOOL_' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2993: 'Args' : illegal type for non-type template parameter 'BOOST_PP_IIF_BOOST_PP_BOOL_0' /home/daniel/dev/boost/trunk/libs/parameter/doc/index.rst(649) : error C2988: unrecognizable template declaration/definition If I test against the 'master' branch of parameter these errors do not occur. If I run the tests using gcc these errors do not occur. I believe changes that were made to the 'develop' branch of parameter are causing these errors. Furthermore I do not see these errors in the 'develop'regression tests for parameter, so i am puzzled. Any help would be appreciated.

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[git workflow questions for boost]
by Robert Ramey 25 Jun '14

25 Jun '14

I've discovered a couple of changes I want to see incorporated into some boost libraries. In this particular instance the modules are mpl and tools. The "best" way of doing this for me is to: use github to fork the modules in question clone the modules to my local machine make (and test) my changes push them to the the fork enter a pull request. sometime later delete the fork from github This is well described here https://help.github.com/articles/fork-a-repo So far so good. But I have a couple of questions about this. I currently have modular boost installed on my machine. It seems that I want to: delete the module in question. clone to the same spot I just deleted. do everything above. delete the module again. clone from the original? update super project? rerun b2 headers? what? - I'm sort of at a loss here. I'm sort of uncomfortable with deleting the "official" version - but it seems the right think to do. I would appreciate any observations/advice from some more experienced boosters. Robert Ramey -- View this message in context: http://boost.2283326.n4.nabble.com/git-workflow-questions-for-boost-tp46644… Sent from the Boost - Dev mailing list archive at Nabble.com.

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new Boost.Test in 1.56.0?
by Yanchenko Maxim 25 Jun '14

25 Jun '14

Hi, There were many changes in Boost.Test recently. Will they go to the 1.56.0 release? Thanks, Maxim

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Attempting to Compile on AIX 6.1 with gcc
by Axel Ismirlian 24 Jun '14

24 Jun '14

Hello everyone, I have been attempting to compile the entirety of boost on AIX 6.1 with gcc. Currently, I am compiling for 32-bits. I have had some moderate success by specifying extra flags to the compilation, but some issues persist that may require code change (or simply more explicit linking) and as a result I am at loss of what to do. Here are some of the issues that pop up: ld: 0711-317 ERROR: Undefined symbol: .test_main(int, char**) collect2: error: ld returned 8 exit status ld: 0711-317 ERROR: Undefined symbol: init_unit_test_suite(int, char**) collect2: error: ld returned 8 exit status I think these two are linking issues, but I am not sure how to include the missing files. The first primarily affects boost.asio, but others are affected as well. The second primarily affects boost.conversion. gcc.link ../bin.v2/libs/math/test/test_bessel_k.test/gcc-4.8.1/debug/link-static/test_bessel_k collect2: fatal error: ../bin.v2/libs/math/test/test_instances/gcc-4.8.1/debug/link-static/libtest_instances.a: not a COFF file In the math library I get this issue, and also many floating point constants are being truncated to zero. Is there any way to prevent that? Allocator = std::allocator<long unsigned int>] BOOST_MP_FORCEINLINE BOOST_CONSTEXPR cpp_int_backend() BOOST_NOEXCEPT{} ../boost/multiprecision/cpp_int.hpp:1032:41: note: candidate expects 0 arguments, 1 provided These compilation errors resolve around multiprecision. I don't know how to proceed on this error at all. I am currently compiling with the following command: ../b2 -a "cxxflags=-fpermissive -g" "linkflags=-lpthread -lc128 -Wl,-bbigtoc" Any suggestions or advice is appreciated! Thank you for your time! Sincerely, -Axel

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Boost Social Event at CppCon
by Jon Kalb 24 Jun '14

24 Jun '14

Boosters, Because a lot of Boosters are going to be attending CppCon, we¹d like to arrange a social event for Boosters/C++Now regulars. http://cppcon.org/ If you are planning to attend CppCon or even If you are just going to be in or around Bellevue, Washington between September 7th and 12 and you¹d like to join us for dinner, please let us know so we can get a count. Please send mail to: social(a)boost.org Once we settle on a date, etc, we¹ll let everyone who responded know when and where, so please let us know, even if you are a ³maybe.² This year¹s CppCon program includes sessions from a number of Boosters and C++Now regulars with sessions specifically about Boost Libraries. If you are considering attending, please be aware that the Early Bird registration deadline is just days away. http://cppcon.org/registration/ If you are attending, please make your hotel reservations soon. We are likely to sell out of our room block. http://cppcon.org/lodging/ I hope to see you at CppCon. Jon

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[optional] Warnings about uninitialized values
by Andrey Semashev 23 Jun '14

23 Jun '14

Hi, When I use boost::optional I often see gcc warnings about using possibly uninitialized values. I've seen such warnings in my projects outside Boost but now I encountered them in Boost.Log. Building the current develop with gcc 4.8 I see this: ./boost/date_time/constrained_value.hpp: In member function ‘boost::shared_ptr<boost::log::v2_mt_posix::sinks::sink> boost::log::v2_mt_posix:: {anonymous}::default_text_file_sink_factory<CharT>::create_sink(const settings_section&) [with CharT = wchar_t; boost::log::v2_mt_posix:: {anonymous}::default_text_file_sink_factory<CharT>::settings_section = boost::log::v2_mt_posix::basic_settings_section<wchar_t>]’: ./boost/date_time/constrained_value.hpp:76:7: warning: ‘*((void*)& day +2)’ may be used uninitialized in this function [-Wmaybe-uninitialized] value_ = value; ^ libs/log/src/init_from_settings.cpp:172:32: note: ‘*((void*)& day +2)’ was declared here optional< unsigned short > day; ^ libs/log/src/init_from_settings.cpp:249:87: warning: ‘*((void*)& weekday +4)’ may be used uninitialized in this function [-Wmaybe-uninitialized] return sinks::file::rotation_at_time_point(weekday.get(), hour, minute, second); ^ libs/log/src/init_from_settings.cpp:171:37: note: ‘*((void*)& weekday +4)’ was declared here optional< date_time::weekdays > weekday; ^ I attached the full log for convenience. The code in question is this function: https://github.com/boostorg/log/blob/develop/src/init_from_settings.cpp#L171 Note that at line 248 and below I check that the optional is filled before using it, so there is no way I'll be accessing any uninitialized data (that is, if boost::optional behaves correctly). I suspect this may be a compiler bug. I tried to create a minimal example to reproduce it but the warning doesn't show in a simple context. However, I'd like it to be worked around somehow (unless it's an actual bug in boost::optional). Any suggestions? Am I missing a bug in my code?

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[chrono] stopwatches tests failing
by Marcel Raad 22 Jun '14

22 Jun '14

Hi, currently all the stopwatches tests are failing with fatal error C1083: Cannot open include file: 'boost/chrono/stopwatches/stopwatch.hpp': No such file or directory (on MSVC). Apparently no symlink is created for the newly moved stopwatches subdirectory. Unfortunately I have no idea how to tell Boost.Build to do that.

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