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[python] non-standard iteration / wrapping member function return value
by Matus Chochlik 04 Jun '13

04 Jun '13

Hi, I'm stuck at trying to make python bindings for a set of classes that use a non-c++-standard iteration protocol. I've made a minimal example of what I'm trying to do: the python-ized classes look in essence like this: //------------------------------------------------------------- class int_range { private: int i, max; public: int_range(int m) : i(0), max(m) { } bool empty(void) const { return i > max; } int front(void) const { return i; } void next(void) { ++i; } }; class range_maker { public: int_range make(void) const { return int_range(10); } }; //------------------------------------------------------------- the boost.python module that I've come up with so far: //------------------------------------------------------------- using namespace boost::python; class _py_int_range_iter { private: int_range _range; public: _py_int_range_iter(int_range range) : _range(range) { } _py_int_range_iter self(void) { return *this; } int next(void) { if(_range.empty()) objects::stop_iteration_error(); int result = _range.front(); _range.next(); return result; } }; class_<_py_int_range_iter>("_py_int_range_iter", init<const int_range&>()) .def("self", &_py_int_range_iter::self) .def("next", &_py_int_range_iter::next) ; class _py_int_range { private: int_range _range; public: _py_int_range(int_range range) : _range(range) { } _py_int_range_iter iter(void) { return _py_int_range_iter(_range); } }; class_<_py_int_range>("_py_int_range", init<const int_range&>()) .def("__iter__", &_py_int_range::iter) ; //------------------------------------------------------------- the problem is that when I register range_maker as follows... //------------------------------------------------------------- class_<range_maker>("range_maker") .def("make", &range_maker::make) ; //------------------------------------------------------------- ... it compiles but (obviously) fails in python at run-time because range_maker::make returns int_range and not _py_int_range. what do I need to do to make this work? I know that I could write _py_range_maker wrapping range_maker and let it return _py_int_range, but this approach does not scale very well. Is there some way to tell the def(...) function that I want to wrap the return value into an object of another type? Is there a return value policy for that or do I need to write my own? If so how? Thanks in advance Matus

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Re: [boost] ATTN: Boost GSoC mentors and students: Continuous Integration for GSoC thoughts
by Niall Douglas 04 Jun '13

04 Jun '13

> > Personally speaking, I think this depth and degree of CI is > > *invaluable* to modern software development practice. > > I could not agree more. > > One thing you may want to add is coverage analysis with > https://coveralls.io/: > > If you build with gcc, pass "-fprofile-arcs -ftest-coverage" both to the compiler > and the linker. After running the tests, you can analyze the coverage with gcov > and send it to coveralls. > To collect and upload, I use the following script: > https://github.com/purpleKarrot/Karrot/blob/develop/test/coveralls.in > (Note that gcov 4.6 does not support all flags that I use in the script, I use it wiht > 4.8 only). That's really super useful of you Daniel. I wasn't aware that such a service existed for code coverage. Thank you. I don't suppose you'd know the answer to this question though: Travis CI's reporting is not great, it either reports success or failure and not *what* failed nor *why*. Specifically, if for example a build fails, I'd like to know which source files and what the compiler errors were. Similarly, if a unit test fails, I want to know which one and what the error was. Do you know if this can be done? Niall --- Opinions expressed here are my own and do not necessarily represent those of BlackBerry Inc.

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Re: [boost] ATTN: Boost GSoC mentors and students: Continuous Integration for GSoC thoughts
by Niall Douglas 04 Jun '13

04 Jun '13

> Just curious: is Visual Studio support not included because not deemed > important? Or not supported by this particular lib? Or not supported by Travis CI > for some reason? (licensing?) As others have mentioned, Travis CI provides only Ubuntu 12.04 x64 instances and none other. Interestingly, you /could/ actually package up MSVC and run it under wine, but Travis CI's free service limits test runs to 20 mins and getting wine et al installed in that time is probably more trouble than it's worth. Besides, I have another very good reason not to: my primary development platform is Visual Studio. Why? It has the least C++11 support, but also the best debugger. Any C++11 feature supported by the Nov 2012 CTP experimental MSVC is easily supported in GCC or clang, whereas the converse is most certainly not true. A further factor is that the library is an async file i/o abstraction layer intended for Boost, and the only true async backend currently is Windows IOCP. Therefore, naturally development, and especially performance tuning, currently focuses there. Travis CI is really useful though for checking Visual Studio work: MSVC I am told does not use an AST internally, and therefore permits C++ no other compiler will allow. Very often I write template metaprogramming which MSVC is absolutely fine with but chokes either GCC or clang or both. Travis CI emails me to tell me when I've done that. This is very, very useful. Niall --- Opinions expressed here are my own and do not necessarily represent those of BlackBerry Inc.

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[thread] call_once regression or it is planed so?
by Antony Polukhin 04 Jun '13

04 Jun '13

Hi, With 1.54.0_beta1 following code fails to compile: #include <boost/thread/once.hpp> void init_host(int); void init_host(); boost::once_flag instance_flag = BOOST_ONCE_INIT; int main() { boost::call_once(&init_host, instance_flag); } In 1.53 it worked fine. Is that meant to be so and no workaround is possible, or is it a bug? -- Best regards, Antony Polukhin

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Asking for permission to merge small bugfix (Spirit)
by Hartmut Kaiser 04 Jun '13

04 Jun '13

I would like to merge a small bugfix to the release branch (commit set 84631, patch below). Regards Hartmut --------------- http://boost-spirit.com http://stellar.cct.lsu.edu Index: C:/CVS/boost/boost/spirit/home/lex/lexer/support_functions.hpp =================================================================== --- C:/CVS/boost/boost/spirit/home/lex/lexer/support_functions.hpp (revision 84630) +++ C:/CVS/boost/boost/spirit/home/lex/lexer/support_functions.hpp (revision 84631) @@ -49,7 +49,7 @@ { typedef typename typename remove_reference< - remove_const< + typename remove_const< typename mpl::at_c<typename Env::args_type, 4>::type >::type >::type

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[1.54.0] Accidentally committed to release docs fix
by Antony Polukhin 04 Jun '13

04 Jun '13

Hi, Without permission, accidentally committed r84603 that fixes docs of Boost.Any. Is it OK to leave that commit or reverting it is preferable? Commit is small and fixes only a single line in docs. -- Best regards, Antony Polukhin

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[1.54.0] Beta Release Candidates available
by Marshall Clow 04 Jun '13

04 Jun '13

Release candidate files for 1.54.0 beta 1 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: 31266b7dcc6f557ad839e4e87317cd6e *boost_1_54_0_beta1_rc1.tar.gz fbf7be9cbaf9ea6fb21ae73d0c17100d *boost_1_54_0_beta1_rc1.tar.bz2 7de4299ab69c941e83fe3fc46dddc15f *boost_1_54_0_beta1_rc1.zip c73e5118ff585d9f1d68542f96a0758a *boost_1_54_0_beta1_rc1.7z Thanks, --The release managers

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[1.54.0] [log] Permission to merge bugfix to release
by Andrey Semashev 04 Jun '13

04 Jun '13

Hi, May I merge the following changesets to the release branch? In short, it fixes the ticket [1] for Boost.Log and the similar issue for string_ref - incorrect handling of width specification with stream IO. Boost.Log: https://svn.boost.org/trac/boost/changeset/84512 https://svn.boost.org/trac/boost/changeset/84514 string_ref: https://svn.boost.org/trac/boost/changeset/84511 https://svn.boost.org/trac/boost/changeset/84513 https://svn.boost.org/trac/boost/changeset/84518 The tests are green. Also, there's a small fix for MinGW 4.4 tests of Boost.Log: https://svn.boost.org/trac/boost/changeset/84515 MinGW 4.4 tests have not been run for quite some time, but I believe it's safe to merge it as well. [1] https://svn.boost.org/trac/boost/ticket/8614

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Request to contribute boost::FFT
by Nathan Bliss 03 Jun '13

03 Jun '13

Dear Boost Community Members, I am writing to ask if I could contribute a C++ FFT implementation to the boost library. I noticed that there is a boost::CRC so I thought it would be a good addition to have boost::FFT as well. MIT have an existing open-source FFTW library, but it is GPL-licensed which is much more restrictive than the Boost license. I should imagine a commercial FFTW license would be very expensive. I have working FFT code which I have tested on Ubuntu Linux GNU gcc and also Visual Studio Express 2012 (MS VC++) for Windows. My code, when run as a 2048-point FFT, agrees with the MIT FFTW one to a max error margin of 6 parts per million. It is implemented using templates in a .hpp file and is very easy to use: ------------------------------------------------------------------------------------------------------------[fft.hpp] template<class FLOAT_TYPE, int FFT_SIZE, int NUM_THREADS>class FFT;///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////[Invocation example] typedef double My_type;FFT<My_type, 2048, 4> user_fft;user_fft.initialise_FFT();get_input_samples(*user_fft.input_value_array, user_fft.m_fft_size);user_fft.execute_FFT();print_output_csv(user_fft.output_value_array, 2048);------------------------------------------------------------------------------------------------------------ It's uniqueness compared to other FFT implementations is that it fully utilises the boost::thread library, to the extent that the user can give the number of threads they want to use as a parameter to the class template (above case is for 4 parallel threads). It is structured and organised so that users could customise/optimise it to specific processor architectures. I've also tried to develop it in the spirit of Boost in that all class members which users should not access are private, only making public what is necessary to the API. My code is a decimation-in-time radix-2 FFT, and users could in theory use the existing API as a basis to extend it to more complex implementations such as the Reverse/Inverse FFT, bit-reversal of inputs/outputs and multi-dimensional FFTs. I look forward to your reply. Kind regards,Nathan Bliss

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web page copyrights
by Charles_J_Wilson＠Dell.com 03 Jun '13

03 Jun '13

I was reading the 1.54.0 beta 1 release notes and managed to scroll down to the bottom of the page. I noticed that the copyright information was not current, so I looked at the main page. It's not current either. As this probably falls on any number of people, I'm posting instead of opening an issue. Charles Wilson Principal Software Development Engineer Dell | Enterprise Solutions Group

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