October 2008 - Boost-users - lists.boost.org

[1.37.0 beta] Beta release available on SourceForge
by Beman Dawes 26 Oct '08

26 Oct '08

1.37.0 beta 1 is available on SourceForge. See http://tinyurl.com/674rcl There is one known bug in the beta; the Getting Started Guide release number is still shown as 1.36.0. That will be fixed in the final release. There is one new library (Proto) in the release and numerous bug fixes and updates to existing libraries. The beta period will be approximately ten days. Please post bug reports to either the boost developer or user lists, but also let us hear about success stories too! Many thanks to Eric Niebler, Daniel James, Rene Rivera, Marshall Clow, the testers, and all the others who helped to get this beta release together. --Beman Dawes

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[fusion] fused_procedure vs. fused_function_object
by Jeff Flinn 24 Oct '08

24 Oct '08

It appears the only difference is that fused_procedure has a void result type regardless of the adapted function's result type, where as fused_function_object's return type is that of the adapted function, is that true? What are the advantages of using fused_procedure, as it appears in my usage that fused_function_object can be used in place of fused_procedure? Awesome lib by the way! Thanks, Jeff

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Installation issue: cannot pass the last test in tutorial,
by Minh Anh 24 Oct '08

24 Oct '08

Hi, I'm a novice here. Sorry if this issue has been posted already. I've searched the archived in the mailing list, and did some searches by google, but couldn't find anything relevant. I've just tried to install boost library to use with Visual Studio 2005. I followed all the steps indicated in the tutorial "getting started on Windows". Everything seems to work fine until the last step, section 6 "link your program to boost library". I did copy/paste the example in this section, and follow the instructions for the configuration. Then I built it with success. However, when I tested the program with the command line like suggested in section 6.4, but it failed. It keep saying that "the system cannot execute the specific program". The command line I used is: "C:\Documents and Settings\A_M\My documents\Visual Studio 2005\Projects\example\debug\example.exe" < "C:\jayne.txt" is this right? Btw, in doubt of a wrong step somewhere, I tried another tutorial that I found on internet at step 1, http://www.quantnet.org/forum/showthread.php?t=2221&page=2 (it's supposed to install boost for VS2008, but I thinks it should be not much different). However it didn't fix the problem. Moreover, it made the boost folder increase from around 900Mb to 8.9Gb???? Something must be wrong? Help me please, Sorry for the long post and many thanks in advance, AM. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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[Python] Setting Python version in Visual Studio
by Tryptik 24 Oct '08

24 Oct '08

I am using boost 1_34_1 and the python module is using Python 2.5. I need to tell it to use 2.4. With bjam, there is a using directive that will link it to 2.4 - is there a pre-processor definition I can use to do this in Visual Studio? I know the boost python docs recommend using boost::jam to build python projects, but I inherited this one from someone and I do not know enough bjam to put it together quickly. Thanks -J __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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BOOST_CLASS_VERSION compiles on MSVC2005, but not on gcc
by professor rumsdiegeige 24 Oct '08

24 Oct '08

Hello, I've got a problem using BOOST_CLASS_VERSION on gcc. The following minimal code example class CHeader : boost::noncopyable { public: CHeader() {PosX_ = 1.0;}; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & PosX_; }; double PosX_; }; works for me both on gcc and on MSVC2005. However, if I add BOOST_CLASS_VERSION(CHeader, 1) then the code only compiles on MSVC2005, but not on gcc. GCC complains about an incorrect syntax here, without being more specific. What am I doing wrong? Thank you for your help, Regards S. Lorentz __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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does Boost.MultiArray work with Boost.MPI?
by Tom Smith 24 Oct '08

24 Oct '08

Dear All, I am trying to write some parallel code using Boost.MPI? I also want to use the class Boost.MultiArray. My question is: does Boost.MultiArray support parallel computation? If not, which class should I use instead for multi-d array operations. Thanks a lot! best wishes Tom

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[ublas] bounded_vector redundant storage of size. (is this a bug?)
by johanngoetz 24 Oct '08

24 Oct '08

for small vectors (geometry vectors is what I have in mind) the bounded_vector and bounded_matrix look promising. Indeed, if I was only dealing with a handful of vectors at a time, this would be ideal. However, I am creating a fieldmap (of a magnetic field, say) which maps 3D vectors (position) to 3D vectors (the field). The likely size of this map is around a million points. This should correspond to 6 million numbers stored. However, if I have something like: std::map< ublas::bounded_vector<int, 3>, ublas::bounded_vector<float, 3> > Then the size is actually 8 million numbers stored since I am storing the size of each of the bounded_vectors. While access time to the map is still very fast, I find that reading in or creating such maps takes much more time than should be required. It seems to me that the advantage of having the size as a template parameter is: not needing to store it as a member variable. Therefore I would like to say this is a bug (do I have agreement?). Unfortunately, the only solution for ublas::bounded_vector I can think of would be a complete reimplementation of ublas::vector just with the size as a template parameter instead of a member variable. but maybe I don't know enough to suggest the proper way to handle such situations. Of course the same applies to ublas::bounded_matrix but the effect there is not as big and it is hard to imagine off-hand a huge array of matrices. --- Johann -- View this message in context: http://www.nabble.com/-ublas--bounded_vector-redundant-storage-of-size.-%28… Sent from the Boost - Users mailing list archive at Nabble.com.

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XML optional field
by Emanuele Rocci 23 Oct '08

23 Oct '08

Hi AllI would like to build a configuration file for my application in XML.The Configuration files includes also optional sectionsi.e. there might be properties that are not required to be defined by the user. If I use BOOST serialization to load this file, the XML format seems to me that forces every field of the XML field to be REQUIRED. Do you know if with Boost serialization for XML there is some mechanismallowing or handling optional Xml field? Kind RegardsManu _________________________________________________________________ Tutto il mondo MSN a portata di clic! http://toolbar.msn.com/overview.aspx?loc=it-it

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Boost 1.36 portability issues on FreeBSD 6.x?
by Alexander Sack 23 Oct '08

23 Oct '08

Hello: I have a FreeBSD 6.1 amd64 box and I'm running into various issues building boost on my platform. In no particular order: - libboost_prg_exec_monitor checks for a lot of optional signal codes (execution_monitor.ipp file) that FreeBSD 6.1 does not support AND FreeBSD 7 supports somewhat. I'm talking about the XSI codes for SIGCHLD, SIGILL, etc. in my /usr/include/sys/signal.h (amd64 tree but is also a problem on my x86 branch): e.g. #define ILL_ILLOPC 1 /* [XSI] illegal opcode */ #define ILL_ILLTRP 2 /* [XSI] illegal trap */ #define ILL_PRVOPC 3 /* [XSI] privileged opcode */ #define ILL_ILLOPN 4 /* [XSI] illegal operand -NOTIMP */ #define ILL_ILLADR 5 /* [XSI] illegal addressing mode -NOTIMP */ #define ILL_PRVREG 6 /* [XSI] privileged register -NOTIMP */ #define ILL_COPROC 7 /* [XSI] coprocessor error -NOTIMP */ #define ILL_BADSTK 8 /* [XSI] internal stack error -NOTIMP */ #define CLD_EXITED What's the best thing to do here? I've actually compiled against FreeBSD 7's signal.h just to get me through this but the fact is the kernel (trap.c) does not set these codes. Will this cause Boost to crap out on me during runtime? If so, is there a workaround since this seems like a real bug in portability? - SIGPOLL is not defined, its SIGIO (I can work around this) - The Boost build when doing its standard tests sets up the LD_LIBRARY_PATH on my box as: LD_LIBRARY_PATH=/usr/bin:/usr/lib:/usr/lib32:/usr/lib64 - ICU for FreeBSD is in /usr/include/local which causes the build.jam stuff to miss autodetecting it On a 64-bit machine, adding /usr/lib32 BREAKS not only the test but most natively compiled binaries - I had to move /usr/lib32 and rename it for some of the tests to work (like boost_std_no_locale) etc. I started a thread on Boost-Build but got no replies. I'm just wondering how portable the latest release of Boost is on FreeBSD? Btw, there are several files I had to patch within boost to even get it to build relatively far (and I haven't tried python support just yet). The current BSD port is 1.34 and has been that for a long time (there was a 1.35 release at some point in beta testing) but I would like to update it to 1.36 but need some guidance on the above. Any guidance would be much appreciated... Thanks! -aps

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[phoenix] or [lamdba] Operating on containers of smart pointers.
by Raindog 23 Oct '08

23 Oct '08

I ran into a problem while cleaning up some old code. What I wanted to do was replace explicit for loops with some stl algorithms or BOOST_FOREACH. Below is the original function: |//in header file: ..snip typedef std::vector<Loki::SmartPtr<ADTChunk> > chunk_vec_t chunk_vec_t chunks; ..snip //in source file: uint32_t ADT::get_connectivity_data( std::vector< std::vector<uint8_t> > &output ) { output.resize(chunks.size()); for(chunk_vec_t::iterator it = chunks.begin(); it < chunks.end(); ++it) { uint32_t success = (*it)->get_connectivity_data(output[it-chunks.begin()]); } return TRUE; } I asked on a separate website for some possibilities of replacing this code with boost::lambda, and the following almost correct suggestion was given to replace the loop: ||std::for_each( chunks.begin(), chunks.end(), bind( &chunk_vec_t::value::type::get_connectivity_data, _1, output[ std::distance( _1, chunks.begn() ] ) ); The problem is that the above obviously does not compile, so I made some changes and came up with this: ||std::for_each( chunks.begin(), chunks.end(), bind( &chunk_vec_t::value_type::StoredType::get_connectivity_data, _1, output[ std::distance( &_1, &chunks[0] ) ] ) ); The problem with the above is that "||&chunk_vec_t::value_type::StoredType::get_connectivity_data|" causes the VC9 compiler to crash =( So I made this change: |std::for_each( chunks.begin(), chunks.end(), bind( &ADTChunk::get_connectivity_data, _1, output[ std::distance( _1, chunks.begin() ) ] ) ); But now I get an error with the call to std::distance not being able to discern the arguments due to ambiguity. Next I thought that I might be able to use zip_iterator to assist in dealing with both of the containers, and then I realized it used tuples, which then made me thing that extracting the iterators from the tuples is going to take a lot of boiler plate code itself. Which led me to settle with the following code that is concise and easily readable but will only work if chunks is a vector essentially: BOOST_FOREACH(chunk_vec_t::value_type it, chunks) { output[std::distance(&it, &chunks[0])] = it->get_connectivity_data(); } So, my final question is, given my above attempts, is there a way to do what the 1st and 5th(the one immediately above this line) code snippets do in a straight-forward manner using either boost::lambda, or, since it will be replaced eventually by phoenix v3, with phoenix v2? Thanks! | | |

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