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RE: [Boost-users] Regex problem
by Evgeny Benediktov 12 Aug '04

12 Aug '04

It was the case. Thank you. Evgeny Benediktov -----Original Message----- From: John Maddock [mailto:john@johnmaddock.co.uk] Sent: Thursday, August 12, 2004 1:04 PM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Regex problem >When extensive usage of regex_match and regex_search functions is done numerous times, then after several thousands iterations >Regex library starts throwing "Regular expression too big" exception on the same regular expressions it worked perfectly with at >several thousands previous iterations. >Looks like Regex fails to do some vital clean up. >If anyone saw this problem before, or has any suggestion about it, this may be very helpful. It's most likely that those exceptions are coming from the matching algorithms (regex_match/regex_search)? If so then it's because the combination of the particular regular expression, and the particular text being matched, were becoming "pathological", so an exception is thrown to prevent the match taking forever to obtain (regexes are NP-Hard to match in the worst case). Often these issues can be resolved by refactoring the regular expression, but you really need to track down which specific expression, against what specific text is causing the problem - try setting your debugger to break when an exception is thrown, and then work back up the stack to see what caused the issue. John Maddock. _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users ***************************** Finjan Software This e-mail and any attached files are confidential and may be legally privileged. The unauthorized use, disclosure or copying of this email or any information contained within it is strictly prohibited. This also confirms that Finjan Software's Vital Securityfor E-Mail has scanned this message for the presence of known viruses and potentially malicious code. Finjan Software - Prevention is the Best Cure! *****************************

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uBLAS - How to use a range of a matrix row?
by Pascal Bauer 12 Aug '04

12 Aug '04

Hi, I have some (strange?) problems with the ublas: I'm writing a SPH-Code for fluids and brittle solids. I use a uBLAS matrix to store all the particle-Data. Now, since the SPH code itself includes a lot of physics, i wrote a "particle" class, that give me access to the values stored in the matrix in an intuitive way. As template argument, i'll give a matrix, so i do no have to take care about matrix internals. It looks somehow thatlike: template <typename T> class Particle { static T& SPHData; //Matrix where the values are stored typename T::size_type GID; //Particle ID (...) matrix_row<T> LData; // Proxy to the particle data vector_range<matrix_row<T> > Pos; // Position vector, for // calculations... (...) typename T::value_type& mass; // Reference to physical values... Particle(typename T::size_type ParticleID); // Constructor, needs // Particle ID } template <typename T> Particle<T>::Particle(typename T::size_type ParticleID) : mass(SPHData(ParticleID, MASS)) // Set the references... { LData.reset(SPHData, ParticleID); // OK, works fine... Pos.reset(LData, range(0, 2)); // Give strange error message: // (at the end of this mail...) } I tried different methods to get the Pos to the right place in my matrix, but if i use the "=" operator, i've got some strange run-time assertion errors. My thing is, that i'd like to have a range of a matrix_row or column, that i can use later for vector-operations. How can I do that? - Pascal Bauer PS: Compile Error for my example code. */home/pbauer/oosph/src/particlecontainer.h:103: instantiated from `sph::Particle<T>::Particle(typename T::size_type) [with T = ParticleTest()::Matrix]' */home/pbauer/oosph/src/test.cpp:36: instantiated from here */usr/include/boost/numeric/ublas/vector_proxy.hpp:126: error: no matching function for call to ` boost::numeric::ublas::matrix_row<boost::numeric::ublas::matrix<double, boost::numeric::ublas::row_major, boost::numeric::ublas::unbounded_array<double> > >::reset( boost::numeric::ublas::matrix_row<boost::numeric::ublas::matrix<double, boost::numeric::ublas::row_major, boost::numeric::ublas::unbounded_array<double> > >&)' */usr/include/boost/numeric/ublas/matrix_proxy.hpp:112: error: candidates are: void boost::numeric::ublas::matrix_row<E>::reset(M&) [with M = boost::numeric::ublas::matrix<double, boost::numeric::ublas::row_major, boost::numeric::ublas::unbounded_array<double> >] */usr/include/boost/numeric/ublas/matrix_proxy.hpp:117: error: void boost::numeric::ublas::matrix_row<E>::reset(M&, typename M::size_type) [with M = boost::numeric::ublas::matrix<double, boost::numeric::ublas::row_major, boost::numeric::ublas::unbounded_array<double> >] -- \ | Pascal Bauer | | Space Research & Planetary Sciences | Research Division | | University of Bern | | Phone: +41316314416 | | e-mail: mailto:pascal.bauer@phim.unibe.ch /

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RE: [Boost-users] Feature for using C++ as script language
by Persson Jonas 12 Aug '04

12 Aug '04

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org]On Behalf Of Jeff Garland > Sent: den 11 augusti 2004 17:19 > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] Feature for using C++ as script language > > > On Wed, 11 Aug 2004 11:33:50 -0300, Maurício wrote > > Hi, > > > > After I discovered Boost, which has regex and filesystem > > libraries, I decided to use C++ for tasks that I usually do with > > Ruby (a Perl-like language), because I know C++ a lot better than > > other languages. However, there's a feature of those languages I > > miss: the ability to call external programs and get the output as a > > string. Does any of Boost libraries (or other free libraries you > > know) have this capability? > > There isn't a boost library, but it would be a nice addition. > Turns out the > 'system' call is available on both windows and unix so you > can do something > like this: > > #include <stdlib.h> > > std::string command = "...your command here..." > std::string tmpfile_name("...your temporary file name here..."); > std::string cmd = command + "> " + tmpfile_name; > system(cmd.c_str()); > std::ifstream output(tmpfile_name.c_str()); > > Of course this has many limits an issues. If you want > something more formal > pstreams might work for you: > > http://pstreams.sourceforge.net/ > > HTH, > > Jeff > Another one is here: http://libexecstream.sourceforge.net/ / Jonas

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Regex problem
by Evgeny Benediktov 12 Aug '04

12 Aug '04

Hello, I want to report a problem with Regex library. When extensive usage of regex_match and regex_search functions is done numerous times, then after several thousands iterations Regex library starts throwing "Regular expression too big" exception on the same regular expressions it worked perfectly with at several thousands previous iterations. Looks like Regex fails to do some vital clean up. If anyone saw this problem before, or has any suggestion about it, this may be very helpful. Thanks, Evgeny ***************************** Finjan Software This e-mail and any attached files are confidential and may be legally privileged. The unauthorized use, disclosure or copying of this email or any information contained within it is strictly prohibited. This also confirms that Finjan Software's Vital Securityfor E-Mail has scanned this message for the presence of known viruses and potentially malicious code. Finjan Software - Prevention is the Best Cure! *****************************

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[BLG] Problem: PropertyMap with three properties
by Ambichl Christoph 11 Aug '04

11 Aug '04

Hello, I am trying to implement an edge-property map with three properties, but it does not work as I expected it. Below is the source code and the compiler error message. Thanks for your help! Christoph *** Source Code *** #include <boost/property_map.hpp> #include <boost/graph/graph_traits.hpp> #include <boost/graph/adjacency_list.hpp> using namespace boost; enum edge_type_t { edge_type }; enum edge_cplex_x_t { edge_cplex_x }; namespace boost { BOOST_INSTALL_PROPERTY(edge, type); BOOST_INSTALL_PROPERTY(edge, cplex_x); } // first try typedef property<edge_type_t, int, property<edge_weight_t, int, property<edge_cplex_x_t, float> > > EdgeProperty; // second try typedef property<edge_type_t, int> EdgeType; typedef property<edge_weight_t, int> EdgeWeight; typedef property<edge_cplex_x_t, int> EdgeX; typedef property< EdgeType, EdgeWeight, EdgeX > EdgeProperty2; typedef adjacency_list<vecS, vecS, directedS, no_property, EdgeProperty> Eag; typedef graph_traits<Eag>::vertex_descriptor vertex_descriptor; typedef graph_traits<Eag>::edge_descriptor edge_descriptor; typedef pair<int,int> Edge; int main() { Eag eag(5); property_map<Eag,edge_type_t>::type e_type = get(edge_type,eag); property_map<Eag,edge_weight_t>::type e_weight = get(edge_weight,eag); property_map<Eag,edge_cplex_x_t>::type e_x = get(edge_cplex_x,eag); add_edge(vertex(0,eag), vertex(1,eag), EdgeProperty(0,3,1.0), eag); return 0; } *** Error Message *** propertymap.cpp: In function `int main()': propertymap.cpp:44: error: no matching function for call to ` boost::property<edge_type_t, int, boost::property<boost::edge_weight_t, int, boost::property<edge_cplex_x_t, float, boost::no_property> > >::property( int, int, double)' /usr/local/include/boost/pending/property.hpp:16: error: candidates are: boost::property<edge_type_t, int, boost::property<boost::edge_weight_t, int, boost::property<edge_cplex_x_t, float, boost::no_property> > >::property(const boost::property<edge_type_t, int, boost::property<boost::edge_weight_t, int, boost::property<edge_cplex_x_t, float, boost::no_property> > >&) /usr/local/include/boost/pending/property.hpp:22: error: boost::property<Tag, T, Base>::property(const T&, const Base&) [with Tag = edge_type_t, T = int, Base = boost::property<boost::edge_weight_t, int, boost::property<edge_cplex_x_t, float, boost::no_property> >] /usr/local/include/boost/pending/property.hpp:21: error: boost::property<Tag, T, Base>::property(const T&) [with Tag = edge_type_t, T = int, Base = boost::property<boost::edge_weight_t, int, boost::property<edge_cplex_x_t, float, boost::no_property> >] /usr/local/include/boost/pending/property.hpp:20: error: boost::property<Tag, T, Base>::property() [with Tag = edge_type_t, T = int, Base = boost::property<boost::edge_weight_t, int, boost::property<edge_cplex_x_t, float, boost::no_property> >]

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Feature for using C++ as script language
by Maurício 11 Aug '04

11 Aug '04

Hi, After I discovered Boost, which has regex and filesystem libraries, I decided to use C++ for tasks that I usually do with Ruby (a Perl-like language), because I know C++ a lot better than other languages. However, there's a feature of those languages I miss: the ability to call external programs and get the output as a string. Does any of Boost libraries (or other free libraries you know) have this capability? Thanks, Maurício

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(newbie) design question (is there an MPL solution?)
by Timothy Perrigo 11 Aug '04

11 Aug '04

I'm just now treading into the (rather intimidating) waters of template metaprogramming, so I'm not even sure if it will fit what I'm trying to accomplish. I need to create a kind of registry to keep track of instances of variables of different types (actually, several of these registries, representing different system states); variables of a type would be identified by an unique (integer) id. In other words, the variables within a particular registry represent the state of the system at a given point in time, so although each registry would have variables of the same types and ids, the values of the variables in different registries may be different. If the variables were all of the same type, a simple map would work. What I would like is a way of asking this registry for a variable of a specified type and id, and get back the appropriate instance (of the appropriate type). I.e., something like the following would be ideal: MyType mt = registry.get<MyType>(my_id); Is there anything in the MPL (or elsewhere in Boost) that might help me accomplish what I'm looking to do? If not, does anyone have any design suggestions to accomplish this in another way? Any help would be appreciated! Thanks, Tim

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Newbie questions and possible bug reports
by Daniel Huber 11 Aug '04

11 Aug '04

Hi, I am a new user to Boost, and I am trying to compile and install Boost for the first time. In the process, I have run into some problems that the Boost maintainers may be interested in. First, I was wondering if there is a specification as to which version of gcc the Boost libraries are known to compile with. In particular, I have a lot of code that only compiles under 2.95.3, and I get a lot of error messages when compiling. Here's an example: /usr/bin/objcopy --set-section-flags .debug_str=contents,debug "bin/boost/libs/test/build/libboost_test_exec_monitor.so/gcc/debug/shared-linkable-true/test_tools.o" ...failed gcc-C++-action bin/boost/libs/test/build/libboost_test_exec_monitor.so/gcc/debug/shared-linkable-true/test_tools.o... If it turns out that Boost is supposed to work with this version of gcc, I can provide more detailed results. I think that due to the failures, the libraries and include files were not installed by the bjam command. Second, I noticed that the zip version of the latest release 1_31_0 contains files that are in windows format (ie, the files contain carriage returns). I'm not sure whether this is intended, since most people who download the zip extension will use it on windows. However, if you try to install from a unix variant, you get very strange errors. Specifically, when running "sh build.sh" in the tools/build/jam_src dir, the program dies with: : command not found : command not found : command not found 'uild.sh: line 13: syntax error near unexpected token `() 'uild.sh: line 13: `echo_run () I don't know whether there are files with this problem outside the tools/build/jam_src directory. Finally, the link to the "boost public CVS repository" on the bug report instructions page (http://www.boost.org/more/bugs.htm) is broken. Sincerely, Daniel Huber

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Thanks - problem solved
by Daniel Huber 10 Aug '04

10 Aug '04

FYI, this did the trick. Thanks for your help. -Daniel boost-users-request(a)lists.boost.org wrote: >Here is what I did to install: >> >> First go to tools/build/jam_src and build jam: >> sh build.sh >> >> Then cd back to the boost root dir, and install: >> tools/build/jam_src/bin.linuxx86/bjam --sTOOLS=gcc >> --prefix=~/local/linux install Two things: a) It should be -sTOOLS=gcc but since the default is gcc on Linux anyway this doesn't really affect the results. b) "~/local/linux" is a shell construct which will only gets expanded by the shell if it's by itself as an argument. You heed to use $HOME/local/linux instead.

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Problem compiling boost under gcc
by Daniel Huber 10 Aug '04

10 Aug '04

Hi, This is a followup to my previous message. I must be doing something wrong, but I am unable to compile boost under gcc 3.2.2 on a Red Hat Linux machine (RH9 linux 2.4.24). Note, I also tried gcc 2.95.3 with the same results. If anyone has the time or the desire to help me out, it would be much appreciated. Here is what I did to install: First go to tools/build/jam_src and build jam: sh build.sh Then cd back to the boost root dir, and install: tools/build/jam_src/bin.linuxx86/bjam --sTOOLS=gcc --prefix=~/local/linux install I get a lot of errors relating to the HardLink command. (I am wondering if the problem might be caused by the bjam program.) I checked the things I thought might be causing problems: The target directory does exist, but the files are not getting copied into that directory (eg. by the FileClone command). I have write permissions in the target directory. I am attaching the output from the compile process. Sincerely, Daniel Huber

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