October 2007 - Boost-users - lists.preview.boost.org

[boost::graph] creating an external map for depth_first_search
by v r 02 Oct '07

02 Oct '07

I cannot figure out how to create a color map for depth first search, i`m using bundled properties and the following type as graph. adjacency_list<listS,setS,bidirectionalS,WorldNode> world_graph_t; right now i`m trying to make it like this, but i get 50 errors and cannot deduce what my error is. template<class VisitorT> THOR_INLINE void DepthFirstSearch(const VisitorT& vis, const vertex_descriptor& start) { using namespace boost; std::vector<default_color_type> color_vec( num_vertices(graph) ); depth_first_search(graph, visitor(vis), color_map(make_iterator_property_map(color_vec.begin(),get(vertex_color,graph))), start); } --------------------------------- Вы уже с Yahoo!? Испытайте обновленную и улучшенную. Yahoo! Почту!

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Bjam linking problem
by desai3＠cooper.edu 02 Oct '07

02 Oct '07

Hi folks: I have successfully wrapped up a C++ program in Python. Now I want to give my libboost_python.so and server.so files to my friend, so that he can use it too. However server.so makes use of libstdc++ and ssl library files, which I have to link statically to the server.so in order to be able to give server.so to someone. However Bjam is not linking libstdc++.a or libssl.a to server.so statically. I will really appreciate if someone could give me any direction about how to link these libraries statically to server.so . Thank you very much. Maulik P.S. My Jamfile looks like this ----------------------------------------------------------------------- project-root ; import python ; extension server : server.cpp <template>@boost/libs/python/build/extension : <include>. <include>../dqp <include>/export/apps/dq/dqweb/include <library-path>/home/o066144/work_in_progress/api/SunOS-5.8-g++ <library-path>/export/apps/dq/dqweb/lib <library-path>/usr/local/lib <find-library>ssl <find-library>crypto <find-library>dl <find-library>socket <find-library>nsl <find-library>gcc <find-library>stdc++ ; ---------------------------------------------------------------------------

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BGL: traveling salesman problem
by Michael Held 02 Oct '07

02 Oct '07

hi bgl-guys, is there a 'traveling salesman' implementation for bgl or is anything in this direction planned? there are several algorithms available, e.g. http://www.tsp.gatech.edu/concorde.html which could be ported to bgl?! best regards, michael

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dumb question about boost::any.
by chun ping wang 02 Oct '07

02 Oct '07

How would i go about implementing operator< for boost::any....

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[program_options] Why is allow_unregistered not implemented for config file?
by Marty Fried 01 Oct '07

01 Oct '07

I want to use the program_options library for my app's, well, program options. There is one set of options, which will usually only be one or two lines, that will have an unknown name; this is only handled by the (boost::program_options::) basic_command_line_parser template, with, apparently, no equivalent functionality for config files. This seems to me to be an oversight. I would have thought there would at least be an option to ignore unknown parameters if they aren't supported like for the command line. For my needs, it looks like I might need to modify the Boost sources to disable the exception on unknown parameters, or force the user to create a special config file for, most likely, a single parameter. Or I can change the syntax to something much less natural. What I'm hoping for is either someone to inform me that I'm wrong, and there is a way to handle config files more elegantly than what I'm seeing, or a suggestion as to how best to implement what I need. Thanks for any help you can offer. -- Marty Fried - email: public.forums (at) gmail.com Left coast, USA

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Boost license / OSI approved
by Ruediger Berlich 01 Oct '07

01 Oct '07

Hi there, I noticed that the Boost license is not listed as an OSI approved license (see here: http://www.opensource.org/licenses/alphabetical ). Why is this ? The license seems to nicely comply with the Open Source definition, from what I can see (see http://www.opensource.org/docs/osd). http://www.fsf.org/licensing/licenses/ lists it as GPL-compatible. Best Regards, Ruediger

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thread, use case: one manager and several worker threads
by Torsten Mohr 01 Oct '07

01 Oct '07

Hi, i have a question regarding boost::thread on general usage. I have a calculation intense problem that can be parallelised quite well. But i'd like the whole thing to be interruptible, so when the user commands to stop calculationg then the threads should stop working on the problem. I don't know how to set this up in principle, some thoughts: I want to create one manager thread and several worker threads. The manager thread commands the worker threads on what job to work. When a worker thread has finished, it tells the manager thread so and can get another job to work on. If a user commands the manager thread to stop working, the manager thread commands the worker threads to stop as soon as possible. I think these are quite some normal requirements, but i don't know how to implement this using boost::thread. What is the preferred way to send commands to threads? Just lock a mutex that is shared with the thread and then write a shared variable? How can a manager thread wait on several worker threads at once without wasting CPU time? How does a worker thread notify the manager thread? I can't see how this can be done with boost::condition, do i miss something? Or is it possible for the worker thread to share a boost::mutex with every worker thread, let the manager thread lock those mutexes? It then can only do "condition->wait" on _one_ of the conditions. Best regards, Torsten.

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one reason I suspect a build problem in prior post,
by Mike Marchywka 01 Oct '07

01 Oct '07

when I added the code to trap the regex_error, the previously clean build returned the following during linking but I didn't think it would be a problem: Info: resolving vtable for boost::regex_errorby linking to __imp___ZTVN5boost11r egex_errorE (auto-import) I'm linking to /libboost_regex-gcc-mt-1_33_1.a and cygboost_regex-gcc-mt-1_33_1.dll Thanks again. [ I decided to add boost while using my mom's machine and I found out I had accidentally included boost in "her" cygwin install so it is quite likely I botched something ] Mike Marchywka 586 Saint James Walk Marietta GA 30067-7165 404-788-1216 (C)<- leave message 989-348-4796 (P)<- emergency only marchywka(a)hotmail.com Note: Hotmail is blocking my mom's entire ISP claiming it is to reduce spam but probably to force users to use hotmail. Please DON'T assume I am ignoring you and try me on marchywka(a)yahoo.com if no reply here. Thanks. _________________________________________________________________ Test your celebrity IQ. Play Red Carpet Reveal and earn great prizes! http://club.live.com/red_carpet_reveal.aspx?icid=redcarpet_hotmailtextlink2

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date_time time_duration getting milliseconds
by Sebastian Hauer 01 Oct '07

01 Oct '07

Hi Boost Users, I've started using boost's date_time library recently which I find quite convenient for the most part. I have to handle times with sub second parts frequently and was wondering what the recommended way is to extract the milliseconds part of a time_duration instance? It seems there is no time_duration.milliseconds() method available and fractional_seconds() is platform dependent. BTW: I am currently using boost 1.34.1. Regards, Sebastian

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u32regex_search crashes
by Anjaly 01 Oct '07

01 Oct '07

Hello, I am new to Boost-regex library. The libray is build with icu support.The user interface is created using wxWidgets library. I want to search a file using u32regex_search. But the program crashes and the error it shows is 'Invalid UTF-8 sequence encountered while trying to encode UTF-32 character'.I am reading the contents of the file and it is stored in char array.The program is crashing when it encounters a char with hex value 00. wxString s=SearchTxt->GetValue(); const char *start=(const char*)buffer; const char *end=(const char*)buffer+len; boost::cmatch what; boost::u32regex e1= boost::make_u32regex(s.fn_str(), boost::regex::icase); while(boost::u32regex_search(start,end, what,e, boost::match_default)) { cout << what[0] << "\n"; } ______________________________________ Scanned and protected by Email scanner

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