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[gil] YCbCr color space added
by Christian Henning 27 Mar '13

27 Mar '13

Hi all, there has been some interest in adding the ycbcr color space to gil. For that I just added the color space with color conversions and a new image type for subsampled images. Thanks for Juan Puertos for the color conversion routines! I believe, so far, the ycbcr is very rudimentary and there is a lot of more work to do but it's a beginning. Please let me know what you think. Sources: http://svn.boost.org/svn/boost/trunk/boost/gil/extension/toolbox/color_spac… http://svn.boost.org/svn/boost/trunk/boost/gil/extension/toolbox/image_type… Regards, Christian

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Re: [boost] [multi-array] compiler errors with visual studio 2012 (nfarnsworth@web.de)
by Dan Searles 27 Mar '13

27 Mar '13

>Date: Sat, 23 Mar 2013 14:12:24 +0100 (CET) >From: nfarnsworth(a)web.de >To: boost(a)lists.boost.org >Subject: [boost] [multi-array] compiler errors with visual studio 2012 >Message-ID: > <trinity-07de36eb-bb16-4dc9-b97b-68516d068e24-1364044344811@3capp-webde-bs37> > >Content-Type: text/plain; charset="UTF-8" > > > Hello, > have this c++ example which compiles with Visual Studio 2010 but with Visual > Studio 2012 I got this compiler errors: > 1>------ Build started: Project: MultiArrayDemo, Configuration: Debug Win32 > ------ > 1> MultiArrayDemo.cpp > 1>d:\sandbox\multiarraydemo\multiarraydemo\multiarraydemo.cpp(11):error > C2059: syntax error : '<' > 1> d:\sandbox\multiarraydemo\multiarraydemo\multiarraydemo.cpp(25) > : see reference to class template instantiation 'Data<T>' being compiled > 1>d:\sandbox\multiarraydemo\multiarraydemo\multiarraydemo.cpp(11):error > C2238: unexpected token(s) preceding ';' > ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== > The example uses the boost 1.53 version. Here is the example code: > #include "stdafx.h" > #include <boost/multi_array.hpp> > const int rows = 3; > const int cols = 5; > template<class T> struct Data > { > typedef boost::multi_array<T,2> data_type; > typedef typename data_type::array_view<1>::type view_type; //here is the > first error > typedef typename data_type::index_range range; > Data() > :A(boost::extents[rows][cols]) > { > double tmp[] = > {1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0,10.0,11.0,12.0,13.0,14.0,15.0}; > A.assign(tmp,tmp+ (rows * cols)); > } > data_type A; > }; > int _tmain(int argc, _TCHAR* argv[]) > { > > Data<double>* data = new Data<double>(); > Data<double>::view_type myView = > data->A[boost::indices[0][Data<double>::range()]]; > delete data; > return 0; > } > Does anybody know how to solve this problem? > Best regards and thank you in advance > Niklas According to Microsoft, the code is non-conformant. Visual Studio 2010 allowed the code to be compiled, but 2012 tightened the requirement. See: http://msdn.microsoft.com/en-us/library/bb531344.aspx (Second point, "Use the template keyword...", but note that they highlighted the wrong keyword). The simple fix is to add the keyword 'template': typedef typename data_type::template array_view<1>::type view_type; //here is the first error Dan Searles

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[fusion] sequence io manipulators
by Jeff Flinn 27 Mar '13

27 Mar '13

When streaming unrelated fusion sets to unrelated ostringstreams from different threads, I get an invalid iterator error. This appears to be due to using a boost::fusion::detail::stream_data::attach's local static arena instance. static void attach(Stream& stream, T const& data) { static arena ar; // our arena ar.data.push_back(new T(data)); stream.pword(get_xalloc_index<Tag>()) = ar.data.back(); } I assume there are issues with using the unguarded stream_data::data std::vector<T*> from multiple threads. This implementation looks problematic in that the arena data does not get cleaned up until program exit as well. Jeff

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[atomic] Could you merge to trunk?
by Vicente J. Botet Escriba 26 Mar '13

26 Mar '13

Hi, there are some modification on trunk that need to be merged to release branch because there are some incompatibilities. Could this be done soon? Thanks, Vicente

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GSoC: Backup admin wanted
by Boris Schaeling 26 Mar '13

26 Mar '13

Anyone who wants to be the backup admin for the GSoC program (in case Boost is accepted)? Drop me a mail if you are interested. We need one for the application. :) Thanks, Boris

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[persistent] BerkeleyDB, SQLite, more
by Stefan Strasser 26 Mar '13

26 Mar '13

Hello everyone, if this is the first time you're hearing about this library proposal, please start by reading the "Motivation" and "Approach" sections here: http://tinyurl.com/ct2vfp5 I've had some time to kill lately, so there are now working storage backends for BerkeleyDB and SQLite. Here's a simple example storing and modifying some objects in a BerkeleyDB: http://pastebin.com/yXJbTdz7 There is also a virtual interface that lets you decide which database to use at runtime, or dynamically link different DBMSs. You'll also be able to use multiple databases at once and have global transactions among them, if the DBMS supports two-phase commits. Are there any suggestions for other storage engines to support? If you are familiar with one you are also very welcome to contribute. The interface is very simple and no knowledge of library internals is needed. At this point storage engines to support should be: - transactional. There is code for a MVCC transaction layer from my own storage engine, but it's not generic enough yet to just put it on top of a non-transactional engine like google's LevelDB. - good at handling BLOBs to store serialized objects. Object/Relational mapping is a whole other project. - preferrably have a very free license. The BerkeleyDB code is seperated from the rest so I don't think there are problems with the GPL-like license "infecting" the entire library if you don't use it. But if you do, it's GPL or commercial. I've looked at Tokyo Cabinet in some detail, but it seems more like a collection of functions to me, that one could use to build a DB with, than a robust product. I would like to be proven wrong on this, as it's often compared to BerkeleyDB and is LGPL-licensed. Suggestions for other embedded databases that could be supported are also welcome. Best regards, Stefan

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New regression test reporting system
by Steven Watanabe 26 Mar '13

26 Mar '13

AMDG I just replaced the XSL scripts used to generate the regression test reports with a C++ implementation. If you encounter any broken links, bad markup, etc., please let me know. I rushed this a bit because xsltproc was misbehaving, and the old reports were coming out empty, so I haven't checked the output as thoroughly as I would have liked, yet. It should become more stable in the next day or two. In Christ, Steven Watanabe

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[gil] Pixel Hasher
by Harg Tholan 26 Mar '13

26 Mar '13

Hey, I've been looking for a hashing function for PixelBased types... with no succes, so I created one. Does this have any value for users? Regards,

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[gil] numeric extensions pixel division.
by Harg Tholan 26 Mar '13

26 Mar '13

Hey, It seems that in the numeric extensions it is implemented the division of channels, but not the division of pixels. Are you planning to include it at some point? thanks.

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Boost.Graph for GSoC 2013 - Yes/No/Maybe?
by Darius L. 25 Mar '13

25 Mar '13

Hi all, I'd like to gauge the interest in proposing a project in Boost.Graph for GSoC (and beyond). Would anyone be interested in additions to Boost.Graph? (to-do list here hasn't changed in a while: http://www.boost.org/doc/libs/1_53_0/libs/graph/doc/challenge.html) If so, what exactly would you be interested in? Also, would anyone be open to mentoring for this project?

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