- Boost-users - lists.boost.org

[Boost.Test] improving BOOST_CHECK_CLOSE for arguments == 0
by Pierre-Jules Tremblay 16 Mar '07

16 Mar '07

I've been having some problems using BOOST_CHECK_CLOSE() (1.33.1) in cases where one of the two arguments is exactly equal to zero: the tolerance check fails in this case (d'oh). I know that I can use BOOST_CHECK_SMALL() in those cases, but it's a real drag to have to write the boilerplate code to handle specific cases where one operand is zero. So this is what I've done: #define MY_CHECK_CLOSE(a,b,c) \ if (a == 0) { BOOST_CHECK_SMALL(b,c); } \ else if (b == 0) { BOOST_CHECK_SMALL(a,c); } \ else { BOOST_CHECK_CLOSE(a,b,c); } I wonder: did I miss something, is there a better way? If not, perhaps this logic could be integrated in the _CLOSE tools. pj

2 3

[graph] Building a graph from file
by Marc Boyer 16 Mar '07

16 Mar '07

Dear all, I am a new boost::graph user, and I have a pb that should be very common, but I do not find any simple way to do it. I have a graph, with, in a file, some vertex name, and, in another file, edge described from vertex name, something like -- nodes.txt -- AAA BBB CCC -- edges.txt -- AAA BBB xx AAA CCC yy CCC AAA zz With the book, it is quite easy to set the vertex names in the graph (with an internal property and the name_map). What seems not easy to me is how to add the edges ? I add to find a way to get a vertex from its name, and the map only do the opposite. Did I have to build a tempory reverse map ? Best regards, Marc Boyer

3 2

[fusion] cannot compile extension example
by Christian Henning 16 Mar '07

16 Mar '07

Hi there, same to my former email. The extension example does not compile with VC7.1. Here are the errors: \boost\libs\fusion\example\extension\test_example.cpp(25) : error C2039: 'is_associative' : is not a member of 'boost::fusion::traits' \boost\libs\fusion\example\extension\test_example.cpp(25) : error C2059: syntax error : ')' \boost\libs\fusion\example\extension\test_example.cpp(26) : error C2653: 'traits' : is not a class or namespace name \boost\libs\fusion\example\extension\test_example.cpp(26) : error C2059: syntax error : ')' \boost\libs\fusion\example\extension\test_example.cpp(26) : error C2143: syntax error : missing ';' before '}' \boost\libs\fusion\example\extension\test_example.cpp(26) : error C2059: syntax error : '}' \boost\libs\fusion\example\extension\test_example.cpp(27) : error C2653: 'traits' : is not a class or namespace name \boost\libs\fusion\example\extension\test_example.cpp(27) : error C2059: syntax error : ')' \boost\libs\fusion\example\extension\test_example.cpp(27) : error C2143: syntax error : missing ';' before '}' \boost\libs\fusion\example\extension\test_example.cpp(27) : error C2059: syntax error : '}' \boost\libs\fusion\example\extension\test_example.cpp(29) : error C2061: syntax error : identifier 'begin' \boost\libs\fusion\example\extension\test_example.cpp(29) : error C2143: syntax error : missing ')' before '==' \boost\libs\fusion\example\extension\test_example.cpp(29) : error C2059: syntax error : ')' \boost\libs\fusion\example\extension\test_example.cpp(29) : error C2457: '__FUNCSIG__': predefined macro cannot appear outside of a function body \boost\libs\fusion\example\extension\test_example.cpp(29) : error C2059: syntax error : ')' \boost\libs\fusion\example\extension\test_example.cpp(29) : error C2501: 'boost::detail::test_failed_impl' : missing storage-class or type specifiers \boost\libs\fusion\example\extension\test_example.cpp(29) : error C2365: 'boost::detail::test_failed_impl' : redefinition; previous definition was a 'function' c:\boost\boost\detail\lightweight_test.hpp(40) : see declaration of 'boost::detail::test_failed_impl' \boost\libs\fusion\example\extension\test_example.cpp(29) : error C2185: 'boost::detail::test_failed_impl' : illegal based allocation \boost\libs\fusion\example\extension\test_example.cpp(29) : fatal error C1903: unable to recover from previous error(s); stopping compilation Christian

2 1

[fusion] Fill Em Up example doesn't compile
by Christian Henning 16 Mar '07

16 Mar '07

Hi there, I'm using VC7.1 and I try to compile the fill_em_up example I found in the cookbook example folder. Unfortunately the it doesn't compile. I have updated my boost to the latest CVS version. Here are the error messages: c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2039: 'category' : is not a member of 'boost::mpl::fusion_iterator<Iterator>' ...... c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2146: syntax error : missing ',' before identifier 'category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2065: 'category' : undeclared identifier c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2976: 'boost::fusion::detail::mpl_iterator_category' : too few template arguments c:\boost\boost\fusion\support\detail\mpl_iterator_category.hpp(28) : see declaration of 'boost::fusion::detail::mpl_iterator_category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2955: 'boost::fusion::detail::mpl_iterator_category' : use of class template requires template argument list c:\boost\boost\fusion\support\detail\mpl_iterator_category.hpp(28) : see declaration of 'boost::fusion::detail::mpl_iterator_category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2955: 'boost::fusion::detail::mpl_iterator_category' : use of class template requires template argument list c:\boost\boost\fusion\support\detail\mpl_iterator_category.hpp(28) : see declaration of 'boost::fusion::detail::mpl_iterator_category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2027: use of undefined type 'boost::fusion::detail::mpl_iterator_category' c:\boost\boost\fusion\support\detail\mpl_iterator_category.hpp(28) : see declaration of 'boost::fusion::detail::mpl_iterator_category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(33) : error C2146: syntax error : missing ';' before identifier 'category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(33) : error C2501: 'boost::fusion::mpl_iterator<Iterator>::category' : missing storage-class or type specifiers with [ Iterator=boost::fusion::extension::begin_impl<boost::fusion::mpl_sequence_tag>::apply<const boost::mpl::iterator_range<mpl_r_advance,mpl_r_end>>::iterator ] c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2039: 'category' : is not a member of 'boost::mpl::fusion_iterator<Iterator>' with [ Iterator=boost::fusion::extension::next_impl<boost::fusion::vector_iterator_tag>::apply<r_advance>::type ] c:\boost\boost\fusion\sequence\container\vector\detail\vector_n.hpp(68) : see reference to class template instantiation 'boost::fusion::mpl_iterator<Iterator>' being compiled with [ Iterator=boost::mpl::next<boost::fusion::mpl_iterator<boost::fusion::extension::begin_impl<boost::fusion::mpl_sequence_tag>::apply<const boost::mpl::iterator_range<mpl_r_advance,mpl_r_end>>::iterator>::iterator_type>::type ] c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2146: syntax error : missing ',' before identifier 'category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C3861: 'category': identifier not found, even with argument-dependent lookup c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2976: 'boost::fusion::detail::mpl_iterator_category' : too few template arguments c:\boost\boost\fusion\support\detail\mpl_iterator_category.hpp(28) : see declaration of 'boost::fusion::detail::mpl_iterator_category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2955: 'boost::fusion::detail::mpl_iterator_category' : use of class template requires template argument list c:\boost\boost\fusion\support\detail\mpl_iterator_category.hpp(28) : see declaration of 'boost::fusion::detail::mpl_iterator_category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2955: 'boost::fusion::detail::mpl_iterator_category' : use of class template requires template argument list c:\boost\boost\fusion\support\detail\mpl_iterator_category.hpp(28) : see declaration of 'boost::fusion::detail::mpl_iterator_category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(32) : error C2027: use of undefined type 'boost::fusion::detail::mpl_iterator_category' c:\boost\boost\fusion\support\detail\mpl_iterator_category.hpp(28) : see declaration of 'boost::fusion::detail::mpl_iterator_category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(33) : error C2146: syntax error : missing ';' before identifier 'category' c:\boost\boost\fusion\sequence\adapted\mpl\mpl_iterator.hpp(33) : error C2501: 'boost::fusion::mpl_iterator<Iterator>::category' : missing storage-class or type specifiers with [ Iterator=boost::mpl::next<boost::fusion::mpl_iterator<boost::fusion::extension::begin_impl<boost::fusion::mpl_sequence_tag>::apply<const boost::mpl::iterator_range<mpl_r_advance,mpl_r_end>>::iterator>::iterator_type>::type ] Is that a know problem? Thanks, Christian

2 1

How to sleep inside a boost::thread?
by Meryl Silverburgh 16 Mar '07

16 Mar '07

Hi, If I create a boost::thread like this: boost::thread thrd1(&reader); 1. how can I sleep inside the thread? (in the method 'reader') 2. when does the thread 'thrd1' terminate?

5 5

Re: [Boost-users] why the following regexp doesn't meet my requirement?
by llwaeva＠21cn.com 16 Mar '07

16 Mar '07

>> But, as I mentioned above, the whole matached string, namely #P{x}, >> will be replaced once the match is found. So, the character [^#] will >> also be replaced, that is not what I want. >Try a negative lookbehind: "(?<!#)#" will match any single "#" that is *not* preceded by another #. > The previous character (whatever it is) >does not form part of the result. >John. Thank you so much. It's amazing! I see that regex is really a powerful tool! BTW, in order to replace the pattern #P and avoid the string start with double #, I find it is all right to specify the exact times in matching when using replace_all_regex, for example replace_all_regex( source, boost::regex("([#]\{1\}P)|([#]\{1\}G)"), string("(?1 FIRST)(?2 SECOND)"), format_all ); of course, using the "negative lookbehind" approach also works in this problem replace_all_regex( source, boost::regex("((?<!#)#P)|((?<!#)#G)"), string("(?1 FIRST)(?2 SECOND)"), format_all ); For my case, the program might be used to handle a LARGE text (perhaps several megabytes). So, I am wondering which approach is faster! Thanks again!

1 0

why the following regexp doesn't meet my requirement?
by llwaeva＠21cn.com 16 Mar '07

16 Mar '07

Hi there, First of all, sorry for so many questions on using of regex. Actually, I am a beginner of regular expression; it is hard for me to understand some terms in document. I am going to extract a string in some pattern like #P{EXP_BEING_EXTRACTED} here, EXP_BEING_EXTRACTED is any expression which I want. For instance, xyz in #P{xyz} and 123_456 in #P{123_456}. But, I also need to ignore the case with double # as prefix, i.e. the output of ##P{123} should be kept unchanged. I use regex_search string source; // source contains the text being handled #P{x} or ##P{x} may occur boost::regex regexp; string::const_iterator start, end; boost::match_results<std::string::const_iterator> what; boost::match_flag_type flags = boost::match_default; regexp = "[#]\{1\}P[{]\([^}]*\)[}]"; start = source.begin(); end = source.end(); if ( regex_search(start, end, what, regexp, flags) ) { // get the expression inside {} here // 1) get the text: string( what[1].first, what[1].second) // 2) replace the whole matched string, i.e., replace string(what[0].first, what[1].second); } The code above is fine for #P{x}; however, for the case ##P{x} regex_search still returns true. It seems that the regex_search firstly found the ##P{x} which is not match the regular expression; then, it go ahead from the second # and do the match again, so it found #P{x} finally. I don't know if the process is similiar to what I depict. Anyway, I just want to know how can I ignore the case ##P{x}. I try to modify the regular expression as follow regexp = "[^#]#P[{]\([^}]*\)[}]"; But, as I mentioned above, the whole matached string, namely #P{x}, will be replaced once the match is found. So, the character [^#] will also be replaced, that is not what I want.

2 1

Re: [Boost-users] why the following regexp doesn't meet my requirement?
by llwaeva＠21cn.com 16 Mar '07

16 Mar '07

>Presumably it's because you're not anchoring the regexp to the start of the string - you're original regexp will work with 2 #s because > it finds a match starting at the 2nd one. If you were to start your regexp thus: "^[#]P" then it would not say that the ## case was correct. Thanks! But it seems still not solve the problem Because the pattern being searched doesn't necessary locate at the beginning of the source string, i.e. the source is likely "abcdefgd##P{xyz}ewerw" Thanks, anyway.

1 0

Re: [Boost-users] why the following regexp doesn't meet my requirement?
by Conway Allen 16 Mar '07

16 Mar '07

Presumably it's because you're not anchoring the regexp to the start of the string - you're original regexp will work with 2 #s because it finds a match starting at the 2nd one. If you were to start your regexp thus: "^[#]P" then it would not say that the ## case was correct. -----Message d'origine----- De : boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] De la part de llwaeva(a)21cn.com Envoyé : 16 March 2007 07:45 À : boost-users(a)lists.boost.org Objet : [Boost-users] why the following regexp doesn't meet my requirement? Hi there, First of all, sorry for so many questions on using of regex. Actually, I am a beginner of regular expression; it is hard for me to understand some terms in document. I am going to extract a string in some pattern like #P{EXP_BEING_EXTRACTED} here, EXP_BEING_EXTRACTED is any expression which I want. For instance, xyz in #P{xyz} and 123_456 in #P{123_456}. But, I also need to ignore the case with double # as prefix, i.e. the output of ##P{123} should be kept unchanged. I use regex_search string source; // source contains the text being handled #P{x} or ##P{x} may occur boost::regex regexp; string::const_iterator start, end; boost::match_results<std::string::const_iterator> what; boost::match_flag_type flags = boost::match_default; regexp = "[#]\{1\}P[{]\([^}]*\)[}]"; start = source.begin(); end = source.end(); if ( regex_search(start, end, what, regexp, flags) ) { // get the expression inside {} here // 1) get the text: string( what[1].first, what[1].second) // 2) replace the whole matched string, i.e., replace string(what[0].first, what[1].second); } The code above is fine for #P{x}; however, for the case ##P{x} regex_search still returns true. It seems that the regex_search firstly found the ##P{x} which is not match the regular expression; then, it go ahead from the second # and do the match again, so it found #P{x} finally. I don't know if the process is similiar to what I depict. Anyway, I just want to know how can I ignore the case ##P{x}. I try to modify the regular expression as follow regexp = "[^#]#P[{]\([^}]*\)[}]"; But, as I mentioned above, the whole matached string, namely #P{x}, will be replaced once the match is found. So, the character [^#] will also be replaced, that is not what I want. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

1 0

Re: [Boost-users] a question about Compiling Boost
by 林秀全 16 Mar '07

16 Mar '07

> hi, I am starting to learn Boost Library. > I use VC6.0 with Intel C++ compiler 9.1 to compile STLport5.1.2,and it is > successful. > So, I want to use intel C++ compiler 9.1 with VC6.0(sp6) and STLport5.1.2to compiler Boost_1_33_1, but it is failed. > I try my best to get the way, but I got nothing. > Can you help me? tell me how to do it !! > Thanks a lot! >

1 0