May 2009 - Boost - lists.boost.org

Re: [boost] [pool] object_pool::destroy_all? (from users)
by diego nieto cid 28 May '09

28 May '09

Hi, Anybody knows what happened to the iterator that was suggested? I mean, what keeps it from being added to the library? Michael Marcin-2 wrote: > > Yes, destructing and recreating the object pool will release and > allocate memory with the system heap. > > - Michael Marcin > May that be avoided by calling the destructors and constructors directly? For example, destroy_all (object_pool& pool) { pool.~object_pool(); new (&pool) object_pool(); } I'm not sure about the correctness of those instructions. Anyway, its not something you want all around your code. -- View this message in context: http://www.nabble.com/-pool--object_pool%3A%3Adestroy_all--%28from-users%29… Sent from the Boost - Dev mailing list archive at Nabble.com.

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[Boost-graph] Trunk nightly testing failures
by Belcourt, Kenneth 28 May '09

28 May '09

Hi, All trunk nightly tests are failing with this diagnostic. error: Unable to find file or target named error: 'subgraph_props.cpp' error: referred from project at error: '../libs/graph/test' Seems like a file is missing. -- Noel

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CMake and library requirements
by Vladimir Prus 28 May '09

28 May '09

Looking at: http://www.boost.org/development/requirements.html#Directory_structure I see that sub-directory 'build' should contain 'Library build files such as a Jamfile'. In SVN HEAD I also see: libs/program_options/CMakeLists.txt Now, cmake is clearly build system, so that file is in violation of the above guideline. May I ask to either: 1. Have cmake folks to fix this? 2. Have the guideline adjusted, with associated moving of Jamfiles out of 'build' directory and removal of 'build' directories that become empty as result? The background is that I plan some work that might require adding Jamfiles for header-only libraries and clearly having Jamfiles in build subdir while having CMakeLists.txt one directory higher is gonna be mightly confusing. Thanks, Volodya

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Re: [boost] Integral type with no upper limit?
by Barend Gehrels 28 May '09

28 May '09

>> >>> Perhaps Boost shouldn't reinvent the wheel? There's already an open-source >>> arbitrary precision arithmetic library: http://gmplib.org/ >>> >> Which says: >> GMP is distributed under the GNU LGPL. This license makes the library >> free to use, share, and improve, and allows you to pass on the result. The >> license gives freedoms, but also sets firm restrictions on the use with >> non-free programs. >> >> There are people using Boost for both free and non-free programs. >> It's my understanding that we (Boost) want to continue to support all of >> them. >> >> > > Personally, I think Boost would be best served providing some sort of > expression template wrapper into which different arbitrary-precision > numbers could be plugged. > We (Bruno and me) are creating exactly this thing. It will be finished soon. We will use it in our other library, GGL, but we develop it separately. > That would mean far less work to get something usable, as it could use > the GMP implementation initially. We do GMP, CLN and IEEE (so float/double/long double). So the code using the library will be independant of which numeric type is used, and can use it also for standard numeric types transparently. > Then a BSL version of the > implementation could be developed incrementally, while non-floss users > could license some implementation to use with the Boost interface. > > Regards, Barend p.s. I intentionally send this to the other list because it is a "developers subject" and because my messages don't come through.

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sparse bitset
by Anuj Garg 28 May '09

28 May '09

my application requires sparse bitsets. Type requirements: *Block *is an unsigned integer type how hard would it be to replace this with a custom structure. basically instead of storing them as a Array or uint's i would like to store them as a link-list of uint or hash-map.

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Spirit Not Parsing
by Aston 28 May '09

28 May '09

Hello, I am evaluating Boot.Spirit for parsing a custom format. I have presented the code below and config file as well. I expect numUsers to be 2 but it is zero, indicating that integer_action() was not call at all. I tried with assign_d as well, it also didn't help. I guess I am missing something, and I cannot figure out that since parse() returns 0. can anybody point that out ? thanks, Aston ============ src file begin ============ #include <iostream> #include <fstream> #include <string> #include <boost/spirit.hpp> using namespace boost::spirit; int numUsers = 0; void integer_action( const int& var) { numUsers = var; }; int parse_conf_file( char* buffer) { rule<> l_root = str_p("FakeRC") >> *blank_p >> *alpha_p >> eol_p; rule<> l_params = *blank_p >> *alpha_p >> *blank_p >> str_p("Integer") >> *blank_p >> *int_p[&integer_action] >> eol_p; rule<> l_end = str_p("end") >> eol_p; rule<> conf_lines = l_root | *l_params | l_end; return parse( buffer, conf_lines).full; } int main( int argc, char** argv) { std::ifstream conf(".fakerc", std::ios::binary); conf.seekg( 0, std::ios::beg); int start = conf.tellg(); conf.seekg( 0, std::ios::end); int end = conf.tellg(); int size = end - start; conf.seekg( 0, std::ios::beg); char* buffer = new char[size]; std::fill( buffer, buffer + size, 0); conf.read( buffer, size); buffer[size - 1] = 0; int err_code = parse_conf_file( buffer); std::cout << ( err_code == 0 ? "success" : "failed"); std::cout << ": " << err_code << std::endl; std::cout << "numUsers: " << numUsers << std::endl; delete[] buffer; conf.close(); return 0; } ============ src file end ============ ============ .fakerc contents ============ FakeRC FakeRC_Name Users Integer 2 end ============ end .fakerc ============ Explore and discover exciting holidays and getaways with Yahoo! India Travel http://in.travel.yahoo.com/

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G++ hack/challenge?
by David Abrahams 27 May '09

27 May '09

Hi all, In preparation for BoostCon, I'm looking for a workaround for the problems described in http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2855.html. In particular I need a way to detect whether a type "has a move constructor" (without causing a compiler error, of course) in GCC 4.4. Ideally, "has a move constructor" would mean - when constructed from an rvalue of the same type, a copy constructor with signature T(T const&) is not used. though I would settle for - has a constructor with the signature T(T&&) I'm willing to use G++-specific hackery if necessary. I strongly suspect it's impossible, but if you can think of any way to do it, I'd really appreciate knowing about it. You'll be my hero forever ;-) TIA, -- Dave Abrahams BoostPro Computing http://www.boostpro.com

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Review request: gil::io
by Christian Henning 26 May '09

26 May '09

Hi to all, the new gil::io extension is ready for review. The release candidate is available from the link below containing the header files, tests, and documentation. There are jamfiles available to run the tests and to compile the documentation. http://gil-contributions.googlecode.com/files/rc2.zip This file is almost 9 MB due to the amount of test images I'm using for testing. If that's a problem I can certainly create a slimmer release candidate. A lot of things have changed for this extension but also a lot of things haven't. The interface is more or less the same. But the list of features has been grown by a lot. For instance, all formats support now in-memory read and write. The tiff extension supports a lot more formats to be read and written. n-bit images are now supported for all formats that include those. etc. etc. Right now the lib is called gil::io_new but once it's accepted it will be renamed to gil::io. Of course, I'm open for all kinds of input, critiques, and insights. Thanks a lot to all people who have helped me on this release! Regards, Christian

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Using boost with visual studio 2010
by Sean Farrow 26 May '09

26 May '09

Hi: I am looking at using boost with the beta 1 of visual studio 2010. If this compiler isn't detected automatically, what files will I need to alter? Any help Appreciated Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 4102 (20090525) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

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The Boost Bug Sprint is coming!!
by Marshall Clow 26 May '09

26 May '09

The boost bug sprint is coming! It starts next Friday, May 28th, and runs through Sunday June 7th. The goal is to address a large number of open bugs/patches/feature requests in the trac system at <http://svn.boost.org>. There are currently 795 open tickets; we'd like to knock that number down _a lot_. What can you do? 1) You can fix bugs. * If you are a library author, you can commit your fixes. ;-) * If you are not a library author, you can fix a problem on your local machine (and test it!!), and then attach your fix as a patch to the Trac ticket for the library author to commit. If you do this, please provide a test case that exercises the problem; i.e, one that fails w/o your patch, and succeeds afterwards. 2) You can characterize bugs. * You can attempt to replicate the bug on your system(s), and attach information that you discover to the Trac ticket. This will make it easier for other people to solve the problem, even if you cannot. * You can write test cases demonstrating the problem, and attach them to the Trac ticket. * You can determine if the bug still exists; sometimes they get fixed, and the ticket never gets closed. 3) You can test patches. * Some of the tickets in the trac system contain patches - some are quite old. You can install these patches on your system, and determine if they (a) build, and (b) work. * You can write test cases for the patches, and attach them to the ticket. 4) You can help implement new features. * There are a whole set of "feature requests" in the Trac system. If you have an idea about one of these, you can add comments to the trac system. You can attempt to implement these new features, and attach the patch to the ticket. (Don't forget the test cases!!). Every day during the bug sprint, I'll post the # of tickets modified/closed/opened on the previous day, as well as the total number of open tickets. --------- Sign-up sheet -------- The following people have committed to participate in the bug sprint. Please add you name here, along with what you can do. 1) Marshall Clow (coordination, Mac OS X characterization) 2) Beman Dawes (filesystem, system, timer) 3) Doug Gregor (function, graph, logic, mpi, numeric, property_map, signals) -- -- Marshall Marshall Clow Idio Software <mailto:marshall@idio.com> It is by caffeine alone I set my mind in motion. It is by the beans of Java that thoughts acquire speed, the hands acquire shaking, the shaking becomes a warning. It is by caffeine alone I set my mind in motion.

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