- Boost-users - lists.preview.boost.org

RE: [Boost-users] Björn Karlsson's Boost Book
by Bjorn.Karlsson＠readsoft.com 03 Feb '06

03 Feb '06

Hello, I just want to say thanks to all of you supporting my Boost book. > From: James Hughes [mailto:JHughes@Linx.co.uk] > Subject: RE: [Boost-users] BjÃ¶rn Karlsson's Boost Book > > I agree. I have the book and it has been very useful > (although I have not > used Boost in anger just yet as project is only just > starting). He really > needs to do another book that covers the rest of the library! James, Writing a book is a huge undertaking, and it's readers' testimonies of usefulness that make it worthwhile. Thanks. Regarding another Boost book, I do have a book on the STL algorithms to write first. After that, who knows... > > From: John Maddock [mailto:john@johnmaddock.co.uk] > > > > Absolutely, actually it's a very good book IMO (and not just > > because I proofread some of the chapters!). John, I believe that the fantastic help I received from you and other brilliant Boosters was key in striking the balance between technical detail and user-level topics. So, your proofreading definitely made the book much better. Cheers, Bjorn

1 0

boost::pp application
by Marco Correia 03 Feb '06

03 Feb '06

hi, I would like to ask if there is a way boost::preprocessor may be used to solve the following problem: The problem is to define a macro that expands to the concatenation of their arguments, without duplicates. The arguments are symbols belonging to a known alphabet. For example, one possible solution for a macro which can take 3 symbols from the alphabet (A,B,C), would be #define RemoveDuplicates(S1,S2,S3) S1 ## S2 ## S3 #define AAA A #define AAB AB #define ABA AB #define ABB AB #define BAA AB #define BAB AB #define BBA AB #define BBB B In my real problem I have an alphabet of 10 symbols, which would be solved similarly with 10^10 #defines instructions, which is too much for the c++ preprocessor. So finally, is there any way boost::preprocessor can help me on this? And also, is there any paper or other document explaining how does boost::preprocessor works inside ? thanks Marco -- Marco Correia <mvc(a)netcabo.pt>

1 0

[serialization] STATIC_ASSERTION_FAILURE on archive load
by cheesy4poofs 03 Feb '06

03 Feb '06

I've read over the compile time trap section of the docs, but I still can't get my serialization code to compile. The code to save my std::map compiles, but the code to load the map asserts on the compile. As far as I can tell, I'm not doing anything wrong (save with const ref, load with non-const ref). I will try to summarize my serialization code below: #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/serialization/map.hpp> #include <boost/serialization/access.hpp> struct DLL_EXPORT Node { friend class boost::serialization::access; unsigned int handle; // handle of current object std::string name; // name of object std::string value; // optional value of object template <typename Archive> void serialize(Archive& ar, const unsigned int version) { ar & handle; ar & name; ar & value; } }; class DLL_EXPORT Manager { // manager node adds a few extra things used in management of each object struct ManagerNode : public Node { friend class boost::serialization::access; private: template <typename Archive> void serialize(Archive& ar, const unsigned int version) { // serialize base class information ar & boost::serialization::base_object <Node> (*this); } }; NodeMap * _nodes; // this method compiles fine void save(const std::string & filename) { std::ofstream outFile; outFile.open(filename.c_str(), std::ios::binary); boost::archive::text_oarchive archiveFile(outFile); const NodeMap * const n = _nodes; archiveFile << *n; } // fails on compile with STATIC_ASSERTION_FAILURE void load(const std::string & filename) { std::ifstream inFile; inFile.open(filename.c_str(), std::ios::binary); boost::archive::text_iarchive archiveFile(inFile); _nodes->clear(); archiveFile >> *_nodes; } }; This is on Windows XP using Visual Studio 7.1. The errors start like this: ..\API\inc\boost\archive\detail\iserializer.hpp(557) : error C2027: use of undefined type 'boost::STATIC_ASSERTION_FAILURE<x>' with [ x=false ] ..\API\inc\boost\archive\detail\iserializer.hpp(557) : see reference to class template instantiation 'boost::STATIC_ASSERTION_FAILURE<x>' being compiled with [ x=false ] ..\API\inc\boost\archive\basic_text_iarchive.hpp(64) : see reference to function template instantiation 'void boost::archive::load<Archive,T>(Archive &,T &)' being compiled with [ Archive=boost::archive::text_iarchive, T=const unsigned int ] ..\API\inc\boost\archive\text_iarchive.hpp(64) : see reference to function template instantiation 'void boost::archive::basic_text_iarchive<Archive>::load_override<T>(T &,int)' being compiled ** snipped for brevity ** Any help would be greatly appreciated. Scott

2 1

Compilation problems from a ublas newbie
by Pete Masterson 03 Feb '06

03 Feb '06

Hi all, I tried to compile the 2D point morph example from http://elonen.iki.fi/code/tpsdemo/2d-morph.cpp and http://elonen.iki.fi/code/tpsdemo/ludecomposition.h with the latest Boost 1.33.1 but I come across two errors. These seem to be related to the use of iterators with ublas::matrix_row and ublas::matrix_column. As a Boost newbie, the errors are not at all intuitive to me, however. I assume that the code above was generated for an older version of Boost and fails to compile now. I would be deeply grateful if you could consider taking a look at the attached the compiler output in the out.txt file. I appreciate your help very much. Regards, Peter __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Compiling... 2d-morph.cpp .\2d-morph.cpp(93) : warning C4267: 'initializing' : conversion from 'size_t' to 'unsigned int', possible loss of data .\2d-morph.cpp(191) : warning C4267: 'initializing' : conversion from 'size_t' to 'const unsigned int', possible loss of data .\2d-morph.cpp(223) : warning C4267: 'initializing' : conversion from 'size_t' to 'const unsigned int', possible loss of data C:\Tools\Boost\include\boost-1_33_1\boost/numeric/ublas/traits.hpp(42) : warning C4267: 'argument' : conversion from 'size_t' to 'const unsigned int', possible loss of data C:\Tools\Boost\include\boost-1_33_1\boost/numeric/ublas/matrix_expression.hpp(4033) : see reference to class template instantiation 'boost::numeric::ublas::promote_traits<X,Y>' being compiled with [ X=__w64 unsigned int, Y=__w64 unsigned int ] .\2d-morph.cpp(230) : see reference to class template instantiation 'boost::numeric::ublas::matrix_matrix_binary<E1,E2,F>' being compiled with [ E1=boost::numeric::ublas::matrix_unary2<boost::numeric::ublas::matrix_range<Matrix>,boost::numeric::ublas::scalar_identity<double>>, E2=boost::numeric::ublas::matrix_range<Matrix>, F=boost::numeric::ublas::matrix_matrix_prod<double,double,double> ] C:\Tools\Boost\include\boost-1_33_1\boost/numeric/ublas/traits.hpp(42) : warning C4244: 'argument' : conversion from '__w64 int' to 'const int', possible loss of data C:\Tools\Boost\include\boost-1_33_1\boost/numeric/ublas/matrix_expression.hpp(4034) : see reference to class template instantiation 'boost::numeric::ublas::promote_traits<X,Y>' being compiled with [ X=__w64 int, Y=__w64 int ] C:\Tools\Boost\include\boost-1_33_1\boost/numeric/ublas/matrix_proxy.hpp(707) : error C2064: term does not evaluate to a function taking 0 arguments C:\Tools\Boost\include\boost-1_33_1\boost/numeric/ublas/matrix_proxy.hpp(706) : while compiling class template member function 'boost::numeric::ublas::matrix_column<M>::const_iterator::const_iterator(const std::iterator<_Category,_Ty> &)' with [ M=Matrix, _Category=boost::numeric::ublas::dense_random_access_iterator_tag, _Ty=double ] .\2d-morph.cpp(202) : see reference to class template instantiation 'boost::numeric::ublas::matrix_column<M>::const_iterator' being compiled with [ M=Matrix ] C:\Tools\Boost\include\boost-1_33_1\boost/numeric/ublas/matrix_proxy.hpp(707) : error C2039: 'it_' : is not a member of 'std::iterator<_Category,_Ty>' with [ _Category=boost::numeric::ublas::dense_random_access_iterator_tag, _Ty=double ] shapematch - 2 error(s), 5 warning(s)

1 0

Re: [Boost-users] Boost.MultiArray bounds checking
by Sohail Somani 02 Feb '06

02 Feb '06

> Ronald Garcia wrote: > > Hi Frank, > > > > There are no plans to add an at() member function. However, I have > > considered adding bounds checking to MultiArray operator[] > as a debug > > mode option. > > What consideration are you making? Some lone time ago I added that > boost::array. Can it hurt to add it? As a user of multi array, I would like to have bounds checking for [] if NDEBUG is not defined (or something similar). It helps a lot while debugging. An assertion would be best. Sohail

1 0

walk thru multi_index
by Dmitriy Bure 02 Feb '06

02 Feb '06

Hello, I'm very interested to use multi_index container in my work. But didn't found much documentation and\or examples. Maybe anyone could suggest a place to find it? Basically now I'm trying to implement probably very simple thing. There is basic structure: struct AvNode { CNode* var; int context; MemoryPlace location; ... }; And I'd like to have multi_index container with such nodes (all fields are non-equal). Something like this: typedef multi_index_container< AvNode, indexed_by< ordered_non_unique< tag<varNcontextIndex>, composite_key< AvNode, BOOST_MULTI_INDEX_MEMBER(AvNode,CNode*,var), BOOST_MULTI_INDEX_MEMBER(AvNode,int,context) > > > > AvNodeSet; And then I need to iterate on this container. Better to say that I'd like to group elements in container by first two fields. Could you help me in this problem? In fact I have one solution but it's too large and non-fine: AvNodeSet avNodes; typedef index<AvNodeSet, varNcontextIndex>::type AvNodesSet2VarNcontext; AvNodesSet2VarNcontext& avNodes2VarNcontext = boost::multi_index::get<varNcontextIndex>(avNodes); AvNodesSet2VarNcontext::iterator it = avNodes2VarNcontext.begin(); while(it != avNodes2VarNcontext.end()) { CNode* var = it->var; AvNodesSet2VarNcontext::iterator it2Var = it; while( (it2Var != avNodes2VarNcontext.end()) && (it2Var ->var== var) ) { int context = it2Var->context; FOO(make_pair(var, context)); AvNodesSet2VarNcontext::iterator it2Context = it2Var; while( (it2Context != avNodes2VarNcontext.end()) && (it2Context->context == context) ) { ++it2Context; } it2Var = it2Context; } it = it2Var; } Hope for your help... -- Best regards, Dmitriy Bure mailto:borech@tepkom.ru

3 2

Re: [Boost-users] BjÃ¶rn Karlsson's Boost Book
by Merrill Cornish 02 Feb '06

02 Feb '06

John, Thanks for the information. I think I will get the book. Merrill

2 1

[regression] Help with cw-8.3
by Ronald Garcia 02 Feb '06

02 Feb '06

Howdy, Boost.MultiArray is getting a regression error under codewarrior, and it appears to be happening in the compiler headers so far as I can tell. The basic message is: ### mwcc Compiler: # In: C:\Program Files\Metrowerks\Codewarrior\MSL\MSL_C++\MSL_Common\Include\numfacet # From: ..\libs\multi_array\test\access.cpp # -------------------------------------------- # 1387: case ios_base::hex: # Error: ^ # expression syntax error The full message can be seen at: http://engineering.meta-comm.com/boost-regression/CVS-HEAD/developer/ output/metacomm-bin-boost-libs-multi_array-test-access-test-cw-8_3- debug-threading-multi_release.html Can anyone provide insight on this? Thanks, ron

1 0

Re: [Boost-users] Getting started with Boost: what did you need to know?
by Merrill Cornish 02 Feb '06

02 Feb '06

David, >> You're saying that all of those libraries have "here are >> all the wrong turns I took in developing this library" pages? I'm not sure this exchange is going to be of any further use. You are getting defensive and sarcastic. It's not really possible to make any sweeping statements about the Boost libraries or their documentation since they are usually each developed by a different person with different backgrounds and different goals. There's nothing inherently good or bad about that--it's simply a fact. I may in unusual in that I do RTFM--or at least try. In the case of Boost documentation, I have been repeated frustrated, usually in different ways in different libraries. So, no, all those libraries I have used don't have "wrong turn" documentation. Merrill

2 1

Re: [Boost-users] [Serialization]: bug while serializing astd:string
by RIVASSEAU Jean Noel 02 Feb '06

02 Feb '06

Hi I have tested with a binary archive and the problem does not occur. Only text archives seem to trigger it (I have not yet tested XML archives). I have replaced all "strange" (non-letters) characters and the problem still happens. So the string contains only letters, I even removed the spaces. However do not forget that I left the line breaks in it (if I remove the line breaks, the problem does not appear). To recapitulate: the problem appears when *all* of the following conditions are met: * using a text archive * using a std::string with line breaks * with a length >=512 And even like that, I am not able to reproduce this bug in a small program, although in my program it is triggered all the time. Now, Robert, if you could look into that, I'd appreciate it... Jean-Noël _____ De : boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] De la part de Robert Ramey Envoyé : mercredi 1 février 2006 18:13 À : boost-users(a)lists.boost.org Objet : Re: [Boost-users] [Serialization]: bug while serializing astd:string This sounds like a bug to me. To help me out - check the following: try different types of archives xml, binary, etc. xml archives have a pending issue if a string contains a character (e.g. '\0') which is not representable in an xml string. Other archive classes don't have this problem. Check to see if its related to a particular character. be sure its really question of size. Robert Ramey "RIVASSEAU Jean Noel" <JN.RIVASSEAU(a)oberthurcs.com> wrote in message news:87F60F7FA02FF749AFB02BD9FCAA6B04C1D8FA@naserv31.nanterre.oberthurcs.com... Hello It seems I have come against a bug in the BSL. I am running on Win 2000 Pro, MinGW (gcc 3.4.2), Boost 1.33.1. If I serialize a standard string with 512 or more characters, the save goes ok but a stream error exception occurs while trying to reload it later from archive. Any string with size < 512 is ok. Also this bug is really strange. It does not happen if the string has no line breaks in it (even if it is more than 512 chars). It also happens on my program, but I was unable to reproduce it with a small test program, even using the same string. Could it be a bug in another part of my rather large program? Or is it really a bug in the BSL? Jean-Noël _____ _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

2 1