August 2010 - Boost-users - lists.boost.org

[boostcon] Where is the viterbi library from boostcon 2009?
by Ravi 11 Aug '10

11 Aug '10

Hello, Does anyone have a copy of the Viterbi (dynamic programming) library from boostcon 2009? My google-fu is insufficient to locate it. An email to the author's email address from the boostcon presentation failed to elicit any response. In case anyone is wondering which talk from boostcon prompted my request, here is a link: http://www.mefeedia.com/watch/32045638 Ravi

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weak_from_this
by Hite, Christopher 11 Aug '10

11 Aug '10

shared_from_this contains a weak_ptr. Why not implement a weak_from_this() member function? Upgrading and downgrading a shared_ptr costs expensive atomic ops. I've got some setup code that just gives weak_ptr's to boost::singals2::slot::track(). Is this a valid (and simple) feature request? Chris

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[boost] [chrono] v0.4.5 Documentation update + warnings removal + bug fixes
by vicente.botet 10 Aug '10

10 Aug '10

Hi, I have made some minor modifications to the Boost.Chrono library as requested on these mailing lists. The implementaton is stable. Waiting for the review I plan to add yet a lightweight stopwatch, as suggested by Tom Tan on a personal mail, which stores a reference to a generalization of the Clock duration or an accumulator of the Clock duration. I'll concentrate also in improving the documentation and the tests. Anthony Williams will be the review manager and I hope we could find a date soon. Even if the review's date is not annonced yet, it will be great if some of you make a pre-review, so the conflicting issues are managed before the review. The library can be downloaded from http://www.boostpro.com/vault/index.php?action=downloadfile&filename=chrono… and the documentation is online on the sandbox http://svn.boost.org/svn/boost/sandbox/chrono/libs/chrono/doc/html/index.ht…. New Features since v0.4.3: Version 0.4.5, July 6, 2010 Documentation update Documentation a.. Overview rewriting b.. Added missing thread_clock reference. c.. How to implement a thread_clock tutorial removed. d.. References section renamed to External Resources. e.. Added links to source examples. f.. Added links between Models and Concepts. g.. Added macros descriptions. h.. Cleanup. Bug Fixes a.. Valgrind fixes: "Conditional jump or move depends on uninitialised value(s)" b.. Take care of Boost.System break on version 1.44 c.. gcc.4.4 "warning: suggest parentheses around '&&' within '||' " removal. Version 0.4.4, February 22, 2010 Warning fixes Bug Fixes a.. scoped_suspend warning removal b.. error_code management completed _____________________ Vicente Juan Botet Escribá http://viboes.blogspot.com/

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[Thread] Missing #includes in future.hpp
by Andrew Holden 10 Aug '10

10 Aug '10

I noticed that my code that uses futures wouldn't compile until I added the following two lines to future.hpp: #include <boost/thread/mutex.hpp> #include <boost/thread/condition_variable.hpp> I am wondering if this is an oversight, or if there is a specific reason these files weren't included in future.hpp

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[property tree][program options] io with Windows Registry?
by Jeff Flinn 10 Aug '10

10 Aug '10

I've see mailing list archives mention supporting Windows Registry, but can not find any mention in the docs for either of these libs. Is there support yet? What I'm hoping to find is portable support for preferences on both Windows registry and Mac plists. Thanks, Jeff

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Invitation to connect on LinkedIn
by Alexander Dong Back Kim 10 Aug '10

10 Aug '10

LinkedIn ------------Alexander Dong Back Kim requested to add you as a connection on LinkedIn: ------------------------------------------ Hermann, I'd like to add you to my professional network on LinkedIn. - Alexander Dong Back Accept invitation from Alexander Dong Back Kim http://www.linkedin.com/e/9m2kgu-gcnzwgc9-6e/vyhGWmEqB2IKeRN9DMTel5y44rvJcs… View invitation from Alexander Dong Back Kim http://www.linkedin.com/e/9m2kgu-gcnzwgc9-6e/vyhGWmEqB2IKeRN9DMTel5y44rvJcs… ------ (c) 2010, LinkedIn Corporation

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lexical_cast
by Internet Retard 09 Aug '10

09 Aug '10

Will lexical_cast be included in the next C++ standard? Is there a list someplace that covers everything from boost that is supposed to make it into the next standard? Thanks

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compiling chapter 2 BGL
by Louis Lavery 09 Aug '10

09 Aug '10

I've owned the BGL book for a few years and am, just now, having a go at chapter 3. I've written... #include <boost/graph/adjacency_list.hpp> int main() { return EXIT_SUCCESS; } ...and, when I compile it using vc9, get... Compiling... main.cpp c:\boost_1_42_0\boost\unordered\unordered_set.hpp(402) : error C2220: warning treated as error - no 'object' file generated c:\boost_1_42_0\boost\unordered\unordered_set.hpp(500) : see reference to class template instantiation 'boost::unordered_set<T,H,P,A>' being compiled c:\boost_1_42_0\boost\unordered\unordered_set.hpp(402) : warning C4224: nonstandard extension used : formal parameter 'hash' was previously defined as a type c:\boost_1_42_0\boost\unordered\unordered_set.hpp(890) : warning C4224: nonstandard extension used : formal parameter 'hash' was previously defined as a type c:\boost_1_42_0\boost\unordered\unordered_set.hpp(989) : see reference to class template instantiation 'boost::unordered_multiset<T,H,P,A>' being compiled c:\boost_1_42_0\boost\multi_index\detail\bucket_array.hpp(115) : warning C4224: nonstandard extension used : formal parameter 'hash' was previously defined as a type c:\boost_1_42_0\boost\multi_index\detail\bucket_array.hpp(165) : see reference to class template instantiation 'boost::multi_index::detail::bucket_array<Allocator>' being compiled c:\boost_1_42_0\boost\multi_index\hashed_index.hpp(437) : warning C4224: nonstandard extension used : formal parameter 'hash' was previously defined as a type c:\boost_1_42_0\boost\multi_index\hashed_index.hpp(1170) : see reference to class template instantiation 'boost::multi_index::detail::hashed_index<KeyFromValue,Hash,Pred,SuperMeta,TagList,Category>' being compiled c:\boost_1_42_0\boost\multi_index\hashed_index.hpp(462) : warning C4224: nonstandard extension used : formal parameter 'hash' was previously defined as a type c:\boost_1_42_0\boost\multi_index\hashed_index.hpp(492) : warning C4224: nonstandard extension used : formal parameter 'hash' was previously defined as a type c:\boost_1_42_0\boost\graph\named_graph.hpp(304) : warning C4224: nonstandard extension used : formal parameter 'property' was previously defined as a type c:\boost_1_42_0\boost\graph\named_graph.hpp(316) : see reference to class template instantiation 'boost::graph::named_graph<Graph,Vertex,VertexProperty>' being compiled c:\boost_1_42_0\boost\graph\named_graph.hpp(309) : warning C4224: nonstandard extension used : formal parameter 'property' was previously defined as a type c:\boost_1_42_0\boost\graph\named_graph.hpp(360) : warning C4224: nonstandard extension used : formal parameter 'property' was previously defined as a type c:\boost_1_42_0\boost\graph\named_graph.hpp(368) : warning C4224: nonstandard extension used : formal parameter 'property' was previously defined as a type Build log was saved at "file://c:\sigmaTrunk\boost\vc\Debug\BuildLog.htm" boost - 1 error(s), 10 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== ...is this to be expected? BTW, very much liked chapter 2, best in the book. Louis.

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Compilation errors with using Boost Interval types
by Chidambaram Annamalai 09 Aug '10

09 Aug '10

Hi, I wanted to use the boost::numeric::interval<T> types for simple arithmetic and elementary functions. I expected them to work out of the box (at least for T=double). However, only arithmetic (+,-,*,/) works. I get name look up errors when I try something like sin(..) or cos(..) of an Interval type. The example with the compiler errors are here: http://codepad.org/4LmWiHiS I tried grepping my global include directory for what the compiler reported it couldn't find (cos_up, cos_down) and the only place it seems to be defined in is: [00:57][~]$ grep -iRl cos_up /usr/include/ /usr/include/boost/numeric/interval/transc.hpp And, including that file doesn't seem to help at all as you can see in the paste. Also on a related note, *none* of the examples here: https://gforge.inria.fr/scm/viewvc.php?view=rev&root=std-interval&sortby=da… compile. I expected at least the examples to work out of the box but they don't. Thanks, Chillu

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Stumped!
by Robert Jones 09 Aug '10

09 Aug '10

The code I write needs to compile under several older versions of Boost, as I'm sure is very common. I have been tripped up by using const_pointer_cast, which apparently doesn't exist very far into the past. As far as I can see, implementing this functionality is not trivial, because it's easy to make a mess of the reference counts in shared pointers. I'd like to know when this functionality was introduced, but with the older documentation offline at the moment I'm a bit scuppered. I thought of downloading old versions from source forge, but find there's a gap between 1.33.1 and 1.38 Any ideas how I can find out? Thx - Rob.

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