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Boost Regex in a DLL
by Metasebia Moges 15 Apr '07

15 Apr '07

Hi All, I wanted to use boost::regex in a DLL whose methods are called a number of times by the main program. The code I wrote in the DLL compiles and builds without any problem. The code in the DLL seems to do the job the first time the DLL is called by the main program but the next time the DLL is called to do the same job again in the same run of the program, it halts. When I do the same piece of job using the standard C++ libraries somehow, everything works fine but not with boost regex. Why? I am not sure if there is any #define or something I missed when boost regex is used in a DLL. Just confused .... FYI: I use Visual C++ 2003. I appreciate any help. mmoges __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Regex: awk
by Metasebia Moges 15 Apr '07

15 Apr '07

Hi All, I am introduced to Boost Regex recently and I have tried a few examples and it seems quite powerful. My question: I would like to do what I could with "awk" using regex in Visual C++. For instance, to parse a line containing space as a separator. I think it is designed for adding such capabilities to C++ and I hope there exists an easy way to do so. I appreciate any useful information. Best regards, mmoges. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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[gil] new io for bmp and pnm files for gil 2.0
by Christian Henning 15 Apr '07

15 Apr '07

Hi there, the io for bmp and pnm files have been updated to compile with gil 2.0. For some reasons I was treading the whole process of updating. But I can happily report that migration was easier than I thought. Files are available at: https://gil-contributions.googlecode.com/svn/trunk/gil_2 Any comments are welcome. Christian

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Re: [Boost-users] Spirit2 cookbook example suggestions welcome
by Joel de Guzman 14 Apr '07

14 Apr '07

ebo(a)sandien.com wrote: > Joel de Guzman <joel(a)boost-consulting.com> said: > >> ebo(a)sandien.com wrote: >> >> EBo! So nice to see you every now and then. > > Joel! You always make me feel so welcome ;-) > >>> Something I was playing around with a couple of years ago and never took the >>> project to full production was a user extensible machine-tool parser which >>> kept the rules and the grammar in persistent dynamically loadable objects. I >>> was able to load new commands on the fly, or actually change the grammar rules >>> themselves... >>> ... >>> Would something like that be interesting? >> Yeah, that's cool! I'm not sure it fits the criteria I outlined though. > > I'll review the criteria tomorrow... > >> Seems to be too complex for the cookbook? > > How many lines/pages of code and description is reasonable? The entire > framework for the above is something like 1,750 lines of code, but that > includes the dynamic parser and 28 RS-274 M and G codes. Stripped down for a > minimal example could be a fraction of that. Anyway, maybe we can come up > with something appropriate. I'm thinking more in the tune of a few lines of grammar here and there -- small enough to digest in a few minutes. Something like... if you want to do something like this, you write something like this. Example: "I want to parse pascal style strings where the first byte is the length (N) of the string, followed by N characters. How do you do it?" Of course that's a very simple example. We have more elaborate examples like "How do you write a C-like language and a virtual machine?". We have that. Now, I want some more in-betweens. Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net

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[boost::statechart] some questions
by Jeffrey Holle 14 Apr '07

14 Apr '07

I'm using boost CVS version gotten on Fri Apr 6 11:48:58 EDT 2007. I'm starting to use boost::statechart for the first time. Scanning the available documentation has produced some questions. I found the following text in a C++ comment within the tutorial: context<>() is used to gain access to the direct or indirect context of a state. This can either be a direct or indirect outer state or the state machine itself. 1, What does "direct" "indirect" context mean? It is documented a number of places that the possible types of reactions are: 1. custom-reaction 2. in-state-reaction 3. deferral 4. transition 2. What is the syntax for using an "in-state-reaction", which I assume is a self transition? 3. What is a custom-reaction? 4. What is a deferral?

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serialization question
by Aljaz 14 Apr '07

14 Apr '07

Hello When I serialize (archive) my class I get string which looks something like: 4422 serialization::archive 3 0 1 2 15 message_request 1 0 0 1 0 1 2 1 Is there any way to hide serialization::archive and message_request, which is a name of a class that was serialized? Thanks for help Regards

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Is the behaviour of the binary_from_base64 intended?
by Anatoli Sakhnik 14 Apr '07

14 Apr '07

Hello! I've run into a strange problem with encoding/decoding base64. Let's have a look at the following code: ///////////////////////////////////////////////////////// #include "boost/archive/iterators/base64_from_binary.hpp" #include "boost/archive/iterators/binary_from_base64.hpp" #include "boost/archive/iterators/transform_width.hpp" #include <string> #include <iostream> using namespace std; using namespace boost::archive::iterators; typedef base64_from_binary< transform_width<string::const_iterator, 6, 8> > base64_t; typedef transform_width< binary_from_base64<string::const_iterator>, 8, 6 > binary_t; int main() { string str("Hello, world!"); cout << str << endl; // This works quite well. string enc(base64_t(str.begin()), base64_t(str.end())); cout << enc << endl; // The following call throws an exception about unacceptable // base64 character in the stream. Probably a bug? //string dec(binary_t(enc.begin()), binary_t(enc.end())); // Hackish workaround: string dec( binary_t(enc.begin()), binary_t(enc.begin() + enc.length() - 1) ); cout << dec << endl; return 0; } ////////////////////////////////////////////////////////////// Does those transforming iterators work as expected? Why the tailoring zero is included in the transformation process? Is there a better way to workaround the problem? Thanks in advance! -- Anatoli Sakhnik.

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[soc 07] SoC 2007 Projects
by Jeff Garland 14 Apr '07

14 Apr '07

Hi All - I'm happy to announce that Boost will be mentoring 9 Google SoC projects this year. They are: Title Student Mentor ----------------------------------------------------------------------------- User-friendly graphs and their measures Andrew Sutton Jeremy Siek FastCGi and SCGI-compatible CGI library Darren Garvey Christopher M Kohlhoff Boost 'Big Integer' proposal Arseny Kapoulkine Jeff Garland Signal Network library Stjepan Rajko Douglas Gregor Evolutionary Computation Library Aaron Garrett Jaakko Järvi Application to extend Boost regex with recursive matching, named sub-expressions, and automata-based matching Hugh Wimberly John Maddock Visualization Of Arrays And STL Containers Jacob R>Voytko Joaquín L. Muñoz Boost.Extension and Reflection Mariano G. Consoni Hartmut Kaiser A Generic Geometric Library Huseyin Akcan Herve Bronnimann You can find the abstracts of these projects online here: http://code.google.com/soc/boost/about.html As with last year, there were many worthy students and projects that ultimately were not selected. So, for all the students that were not selected realize that the competition for a very few slots was immense. My main advice for students that might want to try again next year is to start participating now -- it really helps to hang out on the list, submit patches, and work on ideas well in advance of SoC. I'd like to thank the mentoring team that evaluated the ~220 applications we received this year. It takes a huge effort to go thru these, read, rank, clarify and give feedback. Note that in addition to the mentors above Andreas Huber, Rene Rivera, and Daniel Wallin all helped with evaluations. For those coming to BoostCon I'll be giving a presentation on Friday about Boost and SoC: http://www.boostcon.com/program/sessions#garland-summer-of-code And, if you aren't coming to BoostCon, well, you should ;-) http://www.boostcon.com/registration Jeff

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[Concept_Check] Is "int &" copy constructible?
by Wu Yinghui, Freddie 14 Apr '07

14 Apr '07

Hi all, I came to this question, since I found that my program using Boost.Concept_check failed to compile when reference types are used as models for the copy constructible concept. I can understand why it failed to compile, as the error messages below explained it: === snip === ..\..\..\boost-1.34\include\boost\concept_check.hpp(176) : warning C4181: qualifier applied to reference type; ignored ..\..\..\boost-1.34\include\boost\concept_check.hpp(176) : error C2529: 'a' : reference to reference is illegal === snip === But my question is more fundamental than this: Is a reference type considered "copy constructible" according to the C++ standard? (Sorry, since I don't have a copy of the Standard at hand, nor am I very good in English to comprehend the Standard even if I had one.) Can any kind soul enlighten me on this concept? Cheers, Freddie -- Wu Yinghui, Freddie Senior Software Engineer Advanced Technology Research and Development Group Volume Interactions Pte Ltd 1 Kim Seng Promenade #12-01 Great World City East Tower Singapore 237994 Tel: +65 62226962 (Ext 216) Fax: +65 62226215 Email: yhwu(a)volumeinteractions.com URL: http://www.volumeinteractions.com http://www.dextroscope.com Important: This message is intended for the recipient(s) addressed above. It contains privileged and confidential information. If you are not the intended recipient, please notify the sender immediately by replying to this message and then delete it from your system. You must not read, copy, use, or disseminate this communication in any form. Thank you.

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[BGL] copying graphs
by Ramy Sadek 13 Apr '07

13 Apr '07

Hello All, I'm using Boost for a work project, and trying to encourage others to use boost for work as well. I've hit a snag using BGL which is hindering that effort. I defined have a class which creates a graph from a graphviz file and uses a dynamic_property_map. I adopted some code straight from the python graphviz example class. My class (mGraph) is defined as follows: class basic_graph : public stored_minstd_rand, public adjacency_list<listS, listS, DirectedS, property<vertex_index_t, std::size_t>, property<edge_index_t, std::size_t> > typedef basic_graph<bidirectionalS> Digraph; typedef boost::graph::python::Digraph mGraph; I have a function that takes in a graph, destructively extracts information from it, while storing the vertex information of visited vertices. I later queries the properties associated with those vertices. Passing by reference allows me to retrieve properties as needed, but destroys the original graph, preventing further processing. So I cobbled together a copy constructor so I could pass by value, but since the vertices are copies of the originals calling attempting to get() a property fails. I don't fully understand the reason for this, but I believe it is a deep vs shallow copy problem. My attempts to use copy_graph() have also failed as my graph uses listS instead of vecS. Changing the template argument to vecS causes internal compiler errors using VS 7.1. So I have two questions. First, how can I modify my class so that it works with copy_graph. Second, how can I implement a copy-constructor that will preserve the dynamic property map and full vertex info so that get() on the copy's properties behaves correctly? Is this even desirable, or does copy-construction have undesirable implications here? Thanks! -Ramy

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