November 2002 - Boost-users - lists.preview.boost.org

Getting a matrix to the power of n
by agiatojon 14 Nov '02

14 Nov '02

Hello all, I am working with a formula which requires me to get the result of a matrix to the power of n (i.e. pow(matrix, n)) but as expected, the <cmath> function pow() is unable to convert from type double to matrix. Does the matrix library have this sort of functionality built in, or maybe some other part of boost? Thanks! Jon Agiato JonAgiato(a)nyc.rr.com

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Problem with matrix_expressions
by agiatojon 14 Nov '02

14 Nov '02

Hello all, I am trying to compile the following code snippet from the documentation of matrix_expressions in which two matrices are used to display the use of addition and subtraction operations. I am not really sure how to post the error messages as there are literally hundreds of them, so here is the code as I am am pretty sure this is going to be one of those well known bugs kind of things. Compiled using VS.NET, debug mode. #include <iostream> #include <boost/numeric/ublas/matrix_expression.hpp> int main() { using namespace boost::numeric::ublas; matrix<double> m1(3, 3), m2(3, 3); for(int i = 0; i < std::min(m1.size1(), m2.size1()); ++i) for(int j = 0; j < std::min(m1.size2(), m2.size2()); ++j) m1(i, j) = m2(i, j) = 3 * i + j; std::cout << m1 + m2 << std::endl; std::cout << m1 - m2 << std::endl; std::cin.get(); return EXIT_SUCCESS; } Thanks! Jon Agiato JonAgiato(a)nyc.rr.com

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ublas/config.hpp compliation error
by Michael Pagels 14 Nov '02

14 Nov '02

This is my first attempt at using ublas, here's the problem -- g++ -DHAVE_CONFIG_H -I. -I.. -I../sg -I../shared -I../include -O2 -g -c Linearity.C -o Linearity.o In file included from ../include/boost/numeric/ublas/matrix.hpp:20, from Linearity.C:16: ../include/boost/numeric/ublas/config.hpp:375: parse error before `,' token ../include/boost/numeric/ublas/config.hpp:381: parse error before `,' token ../include/boost/numeric/ublas/config.hpp:387: parse error before `,' token ../include/boost/numeric/ublas/config.hpp:401: too many template parameter lists in declaration of `typename V::size_type boost::numeric::ublas::num_elements(const V&)' ../include/boost/numeric/ublas/config.hpp:401: syntax error before `{' token ../include/boost/numeric/ublas/config.hpp:404: parse error before `>' token ../include/boost/numeric/ublas/config.hpp:408: parse error before `>' token ../include/boost/numeric/ublas/config.hpp:413: too many template parameter lists in declaration of `typename MV::size_type num_non_zeros(const MV&)' ../include/boost/numeric/ublas/config.hpp:413: syntax error before `{' token /usr/include/g++-v3/bits/std_cmath.h:69: confused by earlier errors, bailing out I'm using boost_1_29_0, and gcc 3.0.4 under Linux. I reviewed the newsgroup and didn't see this problem mentioned, so I'm sure it's something obvious to the experienced. Thanks

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addendum to previous post on matrix_expression
by agiatojon 14 Nov '02

14 Nov '02

Ok, I fixed some of my mistakes but it now appears the overloaded operators aren't being seen so I must be missing another header or something. Once again here's the code compiled under VS.NET, debug, boost version 1_29_0, with the resultant error messages following. #include <iostream> #include <boost/numeric/ublas/matrix.hpp> #include <boost/numeric/ublas/matrix_expression.hpp> int main() { using namespace boost::numeric::ublas; matrix<double> m1(3, 3), m2(3, 3); for(unsigned int i = 0; i < std::min(m1.size1(), m2.size1()); ++i) for(unsigned int j = 0; j < std::min(m1.size2(), m2.size2()); ++j) m1(i, j) = m2(i, j) = 3 * i + j; std::cout << m1 + m2 << std::endl; std::cout << m1 - m2 << std::endl; std::cin.get(); return EXIT_SUCCESS; } c:\Documents and Settings\Agiato\My Documents\Visual Studio Projects\test5\matrixAddSub.cpp(15): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'boost::numeric::ublas::matrix_binary_traits<E1,E2,F>::result_ty pe' (or there is no acceptable conversion) with [ E1=boost::numeric::ublas::matrix<double,boost::numeric::ublas::row_ma jor,boost::numeric::ublas::unbounded_array<double>>, E2=boost::numeric::ublas::matrix<double,boost::numeric::ublas::row_ma jor,boost::numeric::ublas::unbounded_array<double>>, F=boost::numeric::ublas::scalar_plus<boost::numeric::ublas::matrix<do uble,boost::numeric::ublas::row_major,boost::numeric::ublas::unbounde d_array<double>>::value_type,boost::numeric::ublas::matrix<double,boo st::numeric::ublas::row_major,boost::numeric::ublas::unbounded_array< double>>::value_type> ] c:\Documents and Settings\Agiato\My Documents\Visual Studio Projects\test5\matrixAddSub.cpp(17): error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'boost::numeric::ublas::matrix_binary_traits<E1,E2,F>::result_ty pe' (or there is no acceptable conversion) with [ E1=boost::numeric::ublas::matrix<double,boost::numeric::ublas::row_ma jor,boost::numeric::ublas::unbounded_array<double>>, E2=boost::numeric::ublas::matrix<double,boost::numeric::ublas::row_ma jor,boost::numeric::ublas::unbounded_array<double>>, F=boost::numeric::ublas::scalar_minus<boost::numeric::ublas::matrix<d ouble,boost::numeric::ublas::row_major,boost::numeric::ublas::unbound ed_array<double>>::value_type,boost::numeric::ublas::matrix<double,bo ost::numeric::ublas::row_major,boost::numeric::ublas::unbounded_array <double>>::value_type> ] Thanks to all for their help! Jon Agiato JonAgiato(a)nyc.rr.com

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[BGL] adjacency_matrix BUG
by mycia 14 Nov '02

14 Nov '02

Hi I compiled the adjacency matrix example in libs/graph/example/adjacency_matrix.cpp however, the output is totally different than expected http://www.boost.org/libs/graph/doc/adjacency_matrix.html it seems that something wrong in out_edges() have any idea? thanks a lot hcyeh

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RE: [Boost-Users] Warnings compiling smart_ptr_test.cpp under MSV C++ 6.0
by Mark Storer 13 Nov '02

13 Nov '02

Good ol' C4786. It warns you whenever a classes name exceeds 255 characters. Templates within templates within... exceed this quite often (as you may have noticed). Microsoft's debugger won't work properly with these classes. Pragma is your friend. Throw this code in before the #includes: #pragma warning (disable: 4786) I generally build my own include file to wrap stl and boost (often a precompiled header). This file ALWAYS disables C4786. Aren't STL compiler messages great? (that would be sarcasm) --Mark Storer Software Engineer Cardiff Software #include <disclaimer> typedef std::disclaimer<Cardiff> Discard;

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Is MTL alive?
by alexei_novakov 13 Nov '02

13 Nov '02

Does anyone know if there is any development of MTL? Where I can find the latest sources and info? What is the status of it anyways? Thank you Alexei Novakov

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Warnings compiling smart_ptr_test.cpp under MSVC++ 6.0
by fejimush 13 Nov '02

13 Nov '02

I am brand new to boost. I have been able to compile and link smart_ptr_test.cpp. I have also been able to successfully run the test without errors. Can anyone tell me why I am getting numerous warnings? (shown below) One more item, the warning takes me to c:\...\VC98\Include\UTILITY Is this a stl implentation problem? Thanks in advanced. ---------------Build Output----------------------- Compiling... smart_ptr_test.cpp c:\program files\microsoft visual studio\vc98\include\utility(25) : warning C4786: 'std::_Tree<boost::shared_ptr<int>,boost::shared_ptr<int>,std:: set<boost::shared_ptr<int>,std::less<boost::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > > ::_Kfn,std::less<boost::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::iterator' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\libs\smart_ptr\smart_ptr_test.cpp(198) : see reference to class template instantiation 'std::pair<std::_Tree<boost::shared_ptr<int>,boost::shar ed_ptr<int>,std::set<boost::shared_ptr<int>,std::less<boost::shared_pt r<int> >,std ::allocator<boost::shared_ptr<int> > >::_Kfn,std::less<boost::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::iterator,bool>' being compiled c:\program files\microsoft visual studio\vc98\include\utility(25) : warning C4786: 'std::_Tree<boost::shared_array<char>,boost::shared_array<char> ,std::set<boost::shared_array<char>,std::less<boost::shared_array<char > >,std::allocator<boost::shared_ array<char> > >::_Kfn,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >::iterator' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\libs\smart_ptr\smart_ptr_test.cpp(242) : see reference to class template instantiation 'std::pair<std::_Tree<boost::shared_array<char>,boost::s hared_array<char>,std::set<boost::shared_array<char>,std::less<boost:: shared_array <char> >,std::allocator<boost::shared_array<char> > >::_Kfn,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >::iterator,bool>' being compiled c:\program files\microsoft visual studio\vc98\include\utility(21) : warning C4786: 'std::pair<std::_Tree<boost::shared_ptr<int>,boost::shared_ptr< int>,std::set<boost::shared_ptr<int>,std::less<boost::shared_ptr<int> >,std::allocator<boost::shared_pt r<int> > >::_Kfn,std::less<boost::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::iterator,bool>::pair<std::_Tree<boost::shared_ptr<int>,boost::share d_ptr<int>,std::set<boost::shared_ptr<int>,std::less<boost::shared_ptr <int> >,std::allo cator<boost::shared_ptr<int> > >::_Kfn,std::less<boost::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::iterator,bool>' : identifier was truncated to '255' characters in the debug information c:\program files\microsoft visual studio\vc98\include\utility(21) : warning C4786: 'std::pair<std::_Tree<boost::shared_array<char>,boost::shared_a rray<char>,std::set<boost::shared_array<char>,std::less<boost::shared_ array<char> >,std::allocator<boos t::shared_array<char> > >::_Kfn,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >::iterator,bool>::pair<std::_Tree<boost::shared_array<char>,boost::sh ared_array<char>,std::set<boost::shared_array<char>,std::less<boos t::shared_array<char> >,std::allocator<boost::shared_array<char> > >::_Kfn,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >::iterator,bool>' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::_Tree<boost::shared_array<char>,boost::shared_array<char> ,std::set<boost::shared_array<char>,std::less<boost::shared_array<char > >,std::allocator<boost::shared_array<char> > >::_Kfn ,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >::_Nil' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::_Tree<boost::shared_array<char>,boost::shared_array<char> ,std::set<boost::shared_array<char>,std::less<boost::shared_array<char > >,std::allocator<boost::shared_array<char> > >::_Kfn ,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >::_Nilrefs' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::_Tree<boost::shared_ptr<int>,boost::shared_ptr<int>,std:: set<boost::shared_ptr<int>,std::less<boost::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::_Kfn,std::less<boos t::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::_Nilrefs' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::_Tree<boost::shared_array<char>,boost::shared_array<char> ,std::set<boost::shared_array<char>,std::less<boost::shared_array<char > >,std::allocator<boost::shared_array<char> > >::_Kfn ,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::_Tree<boost::shared_array<char>,boost::shared_array<char> ,std::set<boost::shared_array<char>,std::less<boost::shared_array<char > >,std::allocator<boost::shared_array<char> > >::_Kfn ,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >::const_iterator' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::_Tree<boost::shared_array<char>,boost::shared_array<char> ,std::set<boost::shared_array<char>,std::less<boost::shared_array<char > >,std::allocator<boost::shared_array<char> > >::_Kfn ,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >::iterator' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::_Tree<boost::shared_array<char>,boost::shared_array<char> ,std::set<boost::shared_array<char>,std::less<boost::shared_array<char > >,std::allocator<boost::shared_array<char> > >::_Kfn ,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >::_Node' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::_Tree<boost::shared_array<char>,boost::shared_array<char> ,std::set<boost::shared_array<char>,std::less<boost::shared_array<char > >,std::allocator<boost::shared_array<char> > >::_Kfn ,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >::_Redbl' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::_Tree<boost::shared_ptr<int>,boost::shared_ptr<int>,std:: set<boost::shared_ptr<int>,std::less<boost::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::_Kfn,std::less<boos t::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::const_iterator' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::_Tree<boost::shared_ptr<int>,boost::shared_ptr<int>,std:: set<boost::shared_ptr<int>,std::less<boost::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::_Kfn,std::less<boos t::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::iterator' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::_Tree<boost::shared_ptr<int>,boost::shared_ptr<int>,std:: set<boost::shared_ptr<int>,std::less<boost::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::_Kfn,std::less<boos t::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::_Redbl' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::pair<std::_Tree<boost::shared_ptr<int>,boost::shared_ptr< int>,std::set<boost::shared_ptr<int>,std::less<boost::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::_Kfn,std: :less<boost::shared_ptr<int> >,std::allocator<boost::shared_ptr<int> > >::iterator,bool>' : identifier was truncated to '255' characters in the debug information c:\boost_1_29_0\boost\checked_delete.hpp(28) : warning C4786: 'std::pair<std::_Tree<boost::shared_array<char>,boost::shared_a rray<char>,std::set<boost::shared_array<char>,std::less<boost::shared_ array<char> >,std::allocator<boost::shared_array<char> > >::_Kfn,std::less<boost::shared_array<char> >,std::allocator<boost::shared_array<char> > >::iterator,bool>' : identifier was truncated to '255' characters in the debug information Linking... GRPostOffice.exe - 0 error(s), 17 warning(s)

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Boost on OS X
by boxerab 13 Nov '02

13 Nov '02

Dear Boost Users, I have been using boost on windows 2000, and I am now trying to move some code over to OS X. I have a PowerPlant application, and I want to use the regex library. Do I have to configure the codewarrior command line tools, or can I use gcc. Gcc seems to be the default compiler if I just issue the "bjam" command. I need to build a target that will link with CodeWarrior. Thanks in advance. Aaron Boxer boxerab(a)NOSPAMyahoo.com

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RE: [Boost-Users] A strange question-)
by Aleksey Gurtovoy 13 Nov '02

13 Nov '02

Sam Gentile wrote: > I went there and indeed it can't get any simpler - at least > in theory-) > Read the document > C:\Boost\boost_1_29_0\libs\type_traits\c++_type_traits.htm > and its quite > simple: > > template <typename T> > struct is_void > { static const bool value = false; }; > > template <> > struct is_void<void> > { static const bool value = true; }; > > That's exactly what I want to show. So I go to the header files and > instead: > > //* is a type T void - is_void<T> > > BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_void,T,false) > > BOOST_TT_AUX_BOOL_TRAIT_SPEC1(is_void,void,true) > > > > Huh? So I look in bool_trait_def.hpp: > > #define BOOST_TT_AUX_BOOL_TRAIT_DEF1(trait,T,C) \ > > template< typename T > struct trait \ > > : mpl::bool_c< C > \ > > { \ > > BOOST_TT_AUX_BOOL_TRAIT_VALUE_DECL(C) \ > > BOOST_MPL_AUX_LAMBDA_SUPPORT(1,trait,(T)) \ > > }; \ Well, the original code doesn't have all these excessive newlines ;), but yes, basically that's how it's implemented. > Argh! Why is it done like this? This makes it much more > complicated and unreadable than it has to be. Why are macros > being used everywhere? Practical engineering matters. If you consider that the fact that there are ~60 trait templates in the library and every time when a new version of a compiler comes out, or when somebody starts porting the library to a new platform, there is a chance that you need to change half of those definitions, from, for instance, template <typename T> struct is_void : mpl::bool_c<false> { }; to template <typename T> struct is_void { BOOST_STATIC_CONSTANT(bool, value = false); typedef mpl::bool_c<value> type; }; it might all make sense, after all :). Something along the lines of both of the above scenarios has actually happened, a couple of times. It's not the whole picture yet, but IMO it's enough of the motivation already, so I won't go too deep into details :). Hope this answers your question, Aleksey

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