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

RE: [Boost-Users] A strange question-)
by Garriss, Michael 14 Nov '02

14 Nov '02

No problem. We all know how frustrating C++ can be sometimes :) . You're right, what they have done is astounding! -Mike -----Original Message----- From: Sam Gentile [mailto:ManagedCode@attbi.com] Sent: Thursday, November 14, 2002 11:28 AM To: Boost-Users(a)yahoogroups.com Subject: RE: [Boost-Users] A strange question-) You're right of course. I do realize that everyone works on this in their "free time," and what has been accomplished has been astounding to say the least. I'm sorry for my rant and I'll re-look at his reply and try to figure it out. Once again, I apologize. Sam Gentile .NET Consultant ManagedCode(a)nospam.attbi.com http://www.samgentile.com http://radio.weblogs.com/0105852/ -----Original Message----- From: Garriss, Michael [mailto:michael.garriss@abacus-direct.com] Sent: Thursday, November 14, 2002 12:57 PM To: 'Boost-Users(a)yahoogroups.com' Subject: RE: [Boost-Users] A strange question-) Keep in mind that Aleksey doesn't get paid for this and he answered your mail on his "free" time. Cut him some slack! I thought his answers for well written. -Mike Garriss -----Original Message----- From: Sam Gentile [mailto:ManagedCode@attbi.com] Sent: Thursday, November 14, 2002 9:29 AM To: Boost-Users(a)yahoogroups.com Subject: RE: [Boost-Users] A strange question-) Well at least you gave somewhat of an answer. I still want to understand how those particular macros give that portability. Sam Gentile .NET Consultant ManagedCode(a)nospam.attbi.com http://www.samgentile.com http://radio.weblogs.com/0105852/ -----Original Message----- From: Jeff Garland [mailto:jeff@crystalclearsoftware.com] Sent: Thursday, November 14, 2002 11:13 AM To: Boost-Users(a)yahoogroups.com Subject: RE: [Boost-Users] A strange question-) > <rant> > > How positively delightful to wait 24 hours and get a non-response like > this. This is like pulling blood out of a stone. At this point, I'll Sorry for your frustrations, but imagine the frustration of the library author after yet another bizarre compiler error on perfectly standard C++. Anyway, I think the answer was in the previous mail: Portability. In an ideal world most of this sort of macro hackery wouldn't exist. Unfortunately, boost exists in the real world... > just forget it and use something else. I do understand that Boost users > tend to be extremely advanced C++ users. For the record, I have been > programming in C++ for well over 10 years and still get confused at > some of the things you do. I am questioning and not understanding your > approach at all. Why? Well, lets look at Stroustrup, 3rd edition page > 160 "Macros are important in C, but have far fewer uses in C++. The > first rule about macros is: Don't use them if you don't have to. Almost > every macro demonstrates a flaw in the program, or the programmer." > Then "avoid macros." Now, I'm sure I'm missing your good reason but there you > go. To me, macros are an ugly legacy from C and render C++ code > unreadable and maintainable. So, how detailed does my question have to > be? I don't understand the whole approach and why it was taken. Is that > clear enough? This viewpoint is just fine if you are creating a library for one platform and compiler. The reality of the current world is that many supposedly standard features of C++ or parts of the standard library are not correct on many of the most common compilers. As a result, if you write a library 'to the standard' it might not get used much since it won't compile or work correctly for most people. In addition, many boost libraries push compilers to the limits and thus for some boost libraries the situation is even more severe. The result is that many boost libraries use various macro techniques to create portable code. Looking ahead a few years most of this will hopefully disappear. HTH, Jeff Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to the Yahoo! <http://docs.yahoo.com/info/terms/> Terms of Service. [Non-text portions of this message have been removed] Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

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RE: [Boost-Users] A strange question-)
by Garriss, Michael 14 Nov '02

14 Nov '02

Keep in mind that Aleksey doesn't get paid for this and he answered your mail on his "free" time. Cut him some slack! I thought his answers for well written. -Mike Garriss -----Original Message----- From: Sam Gentile [mailto:ManagedCode@attbi.com] Sent: Thursday, November 14, 2002 9:29 AM To: Boost-Users(a)yahoogroups.com Subject: RE: [Boost-Users] A strange question-) Well at least you gave somewhat of an answer. I still want to understand how those particular macros give that portability. Sam Gentile .NET Consultant ManagedCode(a)nospam.attbi.com http://www.samgentile.com http://radio.weblogs.com/0105852/ -----Original Message----- From: Jeff Garland [mailto:jeff@crystalclearsoftware.com] Sent: Thursday, November 14, 2002 11:13 AM To: Boost-Users(a)yahoogroups.com Subject: RE: [Boost-Users] A strange question-) > <rant> > > How positively delightful to wait 24 hours and get a non-response like > this. This is like pulling blood out of a stone. At this point, I'll Sorry for your frustrations, but imagine the frustration of the library author after yet another bizarre compiler error on perfectly standard C++. Anyway, I think the answer was in the previous mail: Portability. In an ideal world most of this sort of macro hackery wouldn't exist. Unfortunately, boost exists in the real world... > just forget it and use something else. I do understand that Boost users > tend to be extremely advanced C++ users. For the record, I have been > programming in C++ for well over 10 years and still get confused at > some of the things you do. I am questioning and not understanding your > approach at all. Why? Well, lets look at Stroustrup, 3rd edition page > 160 "Macros are important in C, but have far fewer uses in C++. The > first rule about macros is: Don't use them if you don't have to. Almost > every macro demonstrates a flaw in the program, or the programmer." > Then "avoid macros." Now, I'm sure I'm missing your good reason but there you > go. To me, macros are an ugly legacy from C and render C++ code > unreadable and maintainable. So, how detailed does my question have to > be? I don't understand the whole approach and why it was taken. Is that > clear enough? This viewpoint is just fine if you are creating a library for one platform and compiler. The reality of the current world is that many supposedly standard features of C++ or parts of the standard library are not correct on many of the most common compilers. As a result, if you write a library 'to the standard' it might not get used much since it won't compile or work correctly for most people. In addition, many boost libraries push compilers to the limits and thus for some boost libraries the situation is even more severe. The result is that many boost libraries use various macro techniques to create portable code. Looking ahead a few years most of this will hopefully disappear. HTH, Jeff Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ Info: <http://www.boost.org> Wiki: <http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

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max, min, VC++6 and 7
by soulofsealion 14 Nov '02

14 Nov '02

Could someone provide me a brief explanation as to why max and min are redefined in \boost\config\suffix.hpp and \boost\config\platform\win32.hpp. It appears that the reason is that the max and min macros defined in windef.h are not type safe. Also, in user application code, would it be recommended to always use the _MAX and _MIN macros in VC++ 6 and 7 so that the STL implementations are always used, and just reserve explicit max and min for the Boost library code?

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Re: Is MTL alive?
by Paul C. Leopardi 14 Nov '02

14 Nov '02

Alexei, See this thread on the MTL-devel mailing list archive: http://www.osl.iu.edu/MailArchives/mtl-devel/msg00435.php As you can see from the mailing list and the download area, there has not been much developer activity since September. There is also an MTL 3 prototype called MXTL at: http://www.mpi.nd.edu/~jsiek/mxtl.html See http://www.osl.iu.edu/MailArchives/mtl-devel/msg00373.php and http://lists.boost.org/MailArchives/boost/msg10435.php Best regards

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Help with boost::function and boost::bind
by electricsnark 14 Nov '02

14 Nov '02

I need to make a registry of callback functions, which are in the form of member functions of objects of various types. ----------- code snippet ----------- class T1 { public: void CallBackFcn(); }; ... class Registry { public: template <typename T> void registerFcn (void (T::*updFcn)(), T* obj ); private: vector< boost::function<void>* > fcnvec; }; template <typename T> void Registry::registerFcn(void (T::*updFcn)(), T* obj) { boost::function<void> *fp = new boost::function<void> ( boost::bind(updFcn,obj) ); fcnvec.push_back( fp ); } main() { .... T1 *pt = new T1; p_Registry->registerFcn(&T1::CallBackFcn, pt); } ----------------------------------------------------- However, before adding the boost::function to the vector, I want to make sure that the callback function isn't already in there. Unfortunately, I can't just look at value of the pointer fp - I need to get to the address of the actual callback function that is to be executed. But I can't figure out how to get there. Any help appreciated.

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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

3 3

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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1.29.1 release timeframe?
by Johan Nilsson 13 Nov '02

13 Nov '02

As the topic says. I do realize that there can be no absolute dates specified, I'd just like to get a hint on whether it's something within the matter of weeks, months or whatever. Thanks // Johan

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RE: [Boost-Users] Q: Boost Python / weave / swig
by Aleksey Gurtovoy 13 Nov '02

13 Nov '02

Claudius Schnörr wrote: > I would like to build a python-interface for a C++-template library I > wrote. > > After looking around a bit, besides Boost-python I found swig > and weave, which seem to have a similar purpose in mind!?! > > I would appreciate it if someone could provide some comparing > hints/links/information about these various solutions (I'm new to all > these packages). > How do they differ in terms of > - the learning curve, > - their capabilities and > - their foci ? > Have you seen this one - http://www.boost.org/libs/python/doc/comparisons.html? It's more than 1 year old, though, so things might have changed since then. In general, it's better to ask Boost.Python-related questions here - http://mail.python.org/mailman/listinfo/c++-sig. For one, you are much likely to get a quicker response :). Aleksey

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Can not gunzip bjam.exe.gz
by Mike Wilson 13 Nov '02

13 Nov '02

Hi, In Cygwin (version 2.125.2.10) I've tried to $ gunzip bjam.exe but get gunzip: bjam.exe.gz: not in gzip format (downloaded http://boost.sourceforge.net/jam-executables/bin.cygwinx86/bjam.exe.gz which was 143,050 bytes in size (x3 tries) ) My WinZip (V8.1) can't read it either. In fact I can't seem to read several of the .gz files that can be downloaded (but I did manage the Windows .zip version). Can anybody give me a clue as to what is wrong ? Mike Wilson

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Erasing an element in shared_ptr
by cadiolis 12 Nov '02

12 Nov '02

I know that the destructor of shared_ptr will call delete for its contents, but what about erasing a member using the standard erase() function in vector?

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RE: [Boost-Users] set thread priority
by Mark Storer 12 Nov '02

12 Nov '02

I'd think a relatively simple implementation would be to simply support them when possible, and otherwise turn all such calls into no-ops. Coming up with a range of priority values that would be portable shouldn't be too terribly difficult either. --Mark Storer Software Engineer Cardiff Software #include <disclaimer> typedef std::disclaimer<Cardiff> Discard;

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using ublas to solve linear systems?
by deane_yang 12 Nov '02

12 Nov '02

I'm trying to see if I can use ublas to solve a linear system of equations. Digging through the documentation, I find a description of a function called 'solve" that says "Solves a linear equation for a triangular matrix." There is also a formula, B = solve(A, B, tag) <------> B <- A-1 B But I just don't know what any of this means (even though I am a mathematician and quite fluent in linear algebra). So a) can ublas be used (without me implementing any additional algorithms) to solve a linear system of equations? b) what exactly does the function solve do?

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RE: [Boost-Users] BUG: counted_base::release
by Per Kristensen 12 Nov '02

12 Nov '02

This is a constructed test case which should illustrate the problem. The bug is only a problem if you access data members of the counted_based object after the call to delete. So you can live happy without knowing anything about the bug if you never do that. //sourcecode begin #include "boost/shared_ptr.hpp" #include "boost/weak_ptr.hpp" class foo { public: void setWeak(boost::shared_ptr<foo> s) { w = s; } private: boost::weak_ptr<foo> w; //the desctuction of this member will delete the counted_based object }; class deleter { public: deleter() :lock(0) {} ~deleter() { assert(lock==0); //assert if destructor is called when we are executing } void operator() (foo *p) { ++lock; //lock the object from destruction within this operation delete p; --lock;//unlock the object } private: int lock; }; void main() { boost::shared_ptr<foo> s(new foo,deleter()); s->setWeak(s); s.reset(); } //source code end -----Original Message----- From: Peter Dimov [mailto:pdimov@mmltd.net] Sent: 11. november 2002 21:43 To: Boost-Users(a)yahoogroups.com Subject: Re: [Boost-Users] BUG: counted_base::release From: "perkristensennettest" <per.kristensen(a)nettest.com> > To me it seems like a bug, that the weak_count in > counted_base::release is decremented before the call to dispose. See > below [...] > > If the call to dispose() indirectly calls weak_release there is an > error as weak_release will decrement the --weak_count and may > destruct the counted_base object. This will happen if you have an > class C with a member of type weak_ptr<C>. Do you have a test case that breaks? Info: < http://www.boost.org> Wiki: < http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl> Unsubscribe: <mailto:boost-users-unsubscribe@yahoogroups.com> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service <http://docs.yahoo.com/info/terms/> . [Non-text portions of this message have been removed]

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uBLAS Matrix Multiplication
by Hickman, Greg 12 Nov '02

12 Nov '02

Why isn't there an overloaded matrix_expression operator* (const matrix_expression&, const matrix_expression&); for peforming matrix multiplication? Greg Hickman

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compose function objects
by daniel szymanski 11 Nov '02

11 Nov '02

hi, i've a question regarding the compose function objects. i was wondering if there is something like compose_f_x_gy etc? i know there's only the compose_f_gx_hy function object. but then i would need g(x) = x, so my question: is there another way to get the same result like using g(x) = x or writing a compose_f_x_gx? thanks, daniel

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RE: [Boost-Users] compose function objects
by Mark Storer 11 Nov '02

11 Nov '02

I'd think you could write a toy function (inline and all that) to do just that, then pass it in as the 'gx' param. I'd be disappointed if it didn't vanish during optimization, leaving just the 'x'. --Mark Storer Software Engineer Cardiff Software #include <disclaimer> typedef std::disclaimer<Cardiff> Discard;

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