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[Regex] This pattern compiles fine for Perl and PCRE but not for Boost Regex
by David Dawe 20 Oct '10

20 Oct '10

Boost Regex fails to compile a regular expression such as "{abc}" with the error "Invalid content of repeat range". However, both Perl and PCRE accept the regular expression, treating the "{" as a literal character. The PCRE man page at http://www.pcre.org/pcre.txt clearly states: An opening curly bracket that appears in a position where a quantifier is not allowed, or one that does not match the syntax of a quantifier, is taken as a literal character. The Perl regular expression man page at http://perldoc.perl.org/perlre.html is similar, though not quite as clear: If a curly bracket occurs in any other context, it is treated as a regular character. In particular, the lower bound is not optional. Nevertheless, the behaviour of both PCRE and Perl are the same. I am currently using Boost 1.39, but I have seen no mention of a change in this area for more recent versions of Boost Regex. And finally ... my question ... Is there a way in Boost Regex to interpret a "{" as a literal character in the above context in a Perl regular expression, while still allowing the "{n,m}" bounded repeat in places where it is syntactically valid? Thanks.

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boost::thread_resource_error
by Julien Martin 19 Oct '10

19 Oct '10

Hello, I am encountering the following error: ********************************** terminate called after throwing an instance of 'boost::thread_resource_error' what(): boost::thread_resource_error Abandon ********************************** trying to run a threadgroup of 500 threads as follows: thread_group * thgrp = new thread_group(); for (int i = 0; i < NUMTHREADS; i++) { thgrp->create_thread(bind(&simulate, i, 100, 0.05, 0.2, 1.0, 100, 100, endPrices)); } thgrp->join_all(); Can anyone please help. I don't understand why I get this error as I have no resource problems with my machine. Julien.

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dynamic_bitset: request to add find_last() function
by Hicham Mouline 19 Oct '10

19 Oct '10

Hello As there is a find_first() function, is there a way to get a find_last() which returns the index of the most significant bit that is on? Regards,

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[boost] [serialization] Braking change with BOOST_CLASS_EXPORT
by petke himself 19 Oct '10

19 Oct '10

Hi, I noticed a breaking change / bug with boost serialization. (I hope this is the right mailinglist for bug reports) Upgrading from boost-1.35.0 to boost_1_44_0.. and I got compilation errors with the BOOST_CLASS_EXPORT macro. I did not write the user code so i dont know anything about the library, but it turns out BOOST_CLASS_EXPORT was called from inside several user namespaces. This meant the macro would try and specialize the template 'somens1::somens2::somens3::boost::serialization::guid_defined', which obviously does not exist. Placing the BOOST_CLASS_EXPORT macro outside of any user namespace solved the compile error. Im not sure why this worked in the old version of boost. But maybe it would be an idea to change the BOOST_CLASS_EXPORT macro, if possible, so that it jumps back into the root namespace. Should be as simple as replacing any "boost::serialization" with "::boost::serialization", right? The error message on VS2008 was: [exec] 1>xxx.h(67) : error C2143: syntax error : missing ';' before '<' [exec] 1>xxx.h(67) : error C2913: explicit specialization; 'somens1::somens2::somens3::boost::serialization::guid_defined' is not a specialization of a class template [exec] 1>xxx.h(67) : error C2059: syntax error : '<' [exec] 1>xxx.h(67) : error C3083: 'mpl': the symbol to the left of a '::' must be a type [exec] 1>xxx.h(67) : error C2039: 'true_' : is not a member of 'somens1::somens2::somens3::boost' [exec] 1>xxx.h(67) : error C2470: 'true_' : looks like a function definition, but there is no parameter list; skipping apparent body [exec] 1>xxx.h(67) : fatal error C1903: unable to recover from previous error(s); stopping compilation Regards, Patrik

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Beginner needs help with Boost thread class
by Julien Martin 19 Oct '10

19 Oct '10

Hello, I am completely new to Boost and I would like to know in which method to put the business logic (work) of my thread class (which inherits from boost::thread). When you do that in Java you implement Runnable and put the business logic in the run() method. How do I do that with boost? Thanks in advance, Julien.

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Fwd: [Graph] Problem with dynamic_properties
by fokenrute 19 Oct '10

19 Oct '10

Hi everybody, I'm new to BGL and very frustrated beacause I can't make a proper use of dynamic_properties. I'm just trying to read a graphviz dot file with read_graphviz and I found a sample which make use of dynamic_properties in order to make a proper call to read_grahviz. Here is the slightly modified sample: typedef boost::adjacency_list < boost::listS, boost::vecS, boost::undirectedS > Graph; typedef boost::graph_traits<Graph>::vertex_descriptor Vertex; typedef boost::graph_traits<Graph>::vertex_iterator Iterator; int main(int argc, char **argv) { Graph g; std::ifstream input(argv[1]); boost::dynamic_properties dp; dp.property("node_id", boost::get(boost::vertex_name, g)); dp.property("weight", boost::get(boost::edge_weight, g)); boost::read_graphviz(input, g, dp, "id"); return 0; } When I try to compile it, g++ returns lots of cryptic template related error messages but I suspect the most relevant part is : no match for 'operator<<' in 'out << boost::get...' I must be doing something wrong, but I can't get it; expect you'll point me out my mistake so that I could re-focus on the algorithms instead of these annoying technical details.

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[review result] mini-review of update to Boost.Assign
by Thorsten Ottosen 19 Oct '10

19 Oct '10

Dear all, Here follows the result of the result of Erwann Rogard's update to Boost.Assign: **************************** The update is not accepted **************************** This is not because the new functioanlity/interface was not seen as an improvement, but because Erwann has chosen to implement a full replacement (or Assign v2) based on the feedback he got during the review. The feedback meant that the new "update" would be much larger than what was present in the mini-review, and the new library should therefore be subject of its own full review. I would like to thank Erwann for his hard work so far, and hope he submits a Boost.Assign v2 in the near future. I would also like to thank the following people who participated in the mini-review: Christopher Jefferson Diederick C. Niehorster John Bytheway kind regards Thorsten, review manager

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Changing the priority of a thread
by Jean-Sebastien Stoezel 19 Oct '10

19 Oct '10

Hello, Is it possible to change the priority of the boost::thread in windows? How do you do it? Thanks, Jean

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Tokenizing UTF-8
by Roshan Naik 19 Oct '10

19 Oct '10

I was looking around to see if Boost has support for tokenizing UTF-8 strings. I don't see any mention of UTF-8 or Unicode in the Boost.Tokenizer documentation. If not Boost.Tokenizer . any other ideas ? I am also looking into ICU. Thanks. - Roshan

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[fusion][mpl] Generating a fusion sequence type from an MPL sequence
by Gabriel Redner 19 Oct '10

19 Oct '10

Hi all, I am unexpectedly stuck looking for some functionality which I assumed would be present. Given an MPL sequence, I want to generate the type of a corresponding fusion sequence, which I can then use to store things: mpl::vector<int, string> mpl_vec; typedef some_metafunction<mpl_vec>::type fusion_vec; // equivalent to fusion::vector<int, string> fusion_vec vec(5, "foo"); Does some_metafunction exist? I'm not sure if I'm just not seeing it (or perhaps thinking wrongly about the problem), or if it really is not present. I was looking at the fusion/mpl bridge at [1], but its functionality seems orthogonal to what I want. Thanks, -Gabe [1] http://www.boost.org/doc/libs/1_44_0/libs/fusion/doc/html/fusion/adapted/mp…

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