February 2009 - Boost-users - lists.preview.boost.org

Link Boost::Python statically
by Marcin Simonides 25 Feb '09

25 Feb '09

Hello, I'm trying to link my Python extension module with static version of Boost::Python library. According to documentation, the auto_link facility should by default supply the library for static linking (libboost_python-vc80-mt-gd-1_38.lib in my case). Unfortunately it doesn't work that way for me - I get the import lib by default and have to supply boost_python dll. If I specifically provide the statically linked lib to the linker I get errors that symbols are defined multiple times by both the static library and the import library. I was able to link statically by: - defining BOOST_ALL_NO_LIB, - defining BOOST_PYTHON_STATIC_LIB, - adding libboost_python-vc80-mt-gd-1_38.lib to link libraries. While this worked I have a strong feeling that it's not the way it was meant to be. I'm using Visual Studio 2005 to compile my project (it's a Win32 DLL project), I'm using Boost 1.38 that I have compiled with bjam (which probably isn't relevant). All boost's *.lib files are in the same directory so they should be all accessible to the linker. I'm not aware of any BOOST_*_DYN_LINK being set (I have never set any Boost related defines other than the above. If you have any tips on how to verify that, I'd be grateful). Could you help me with this problem? Is there anything I should check that would cause the DLL to be used by default? -- Marcin Simonides

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[Q] error with shared_ptr, for_each, boost::mem_fn
by V S P 25 Feb '09

25 Feb '09

Hi, I cannot resolve why boost::mem_fn does not appear to be able to resolve to a pointer (or a reference) from a smart pointer to a derived object (My understanding is that get_pointer in boost::shared_ptr is specifically available so that boost::mem_fn can work) Here is the example of code and line with error (Visual Studion 2008 32 bit) Thank you in advance for any help ---------------------------------------------- #include <iostream> #include <boost/shared_ptr.hpp> #include <boost/mem_fn.hpp> #include <boost/lexical_cast.hpp> #include <boost/utility.hpp> #include <boost/enable_shared_from_this.hpp> #include <vector> using namespace boost; using namespace std; struct A: public enable_shared_from_this<A> { static void myfunc(const A* in) { } }; struct B: public A, public enable_shared_from_this<B> { typedef shared_ptr<B> tBptr; }; int main (void) { vector<B::tBptr> v; B::tBptr p(new B()); v.push_back(p); p.reset(new B()); v.push_back(p); //error cannot deduce argument for_each (v.begin(),v.end(), boost::mem_fn(&A::myfunc)); return 0; } -- V S P toreason(a)fastmail.fm -- http://www.fastmail.fm - A fast, anti-spam email service.

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problem with boost regex search
by Guy LaCrosse 25 Feb '09

25 Feb '09

hello, When I enter the following reg-ex: "^.*ab+c+d+" for the following text: "aaaabbbcccdddee" the text found is:"aaaabbbcccd". The text found should be: "aaaabbbcccddd". Digging deeper, its seems that the reg-ex function ignores the last character if it is a "+". This is just using boost::regex_search with the flags = boost::match_any and boost::match_not_null Am I missing something here?

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circular_buffer_space_optimized possible bug
by Birju Prajapati 24 Feb '09

24 Feb '09

Hi, When I run the following code: int main() { boost::circular_buffer_space_optimized<int> buf; std::cout << buf.size() << std::endl; buf.push_back(1); std::cout << buf.size() << std::endl; } I get the output 0 0 Is this a bug? This is boost 1.38, gcc 4.3.2 It works fine with boost 1.35, gcc 4.1.2 (gives the output 0,1) TIA Birju Schneider Trading 4th Floor, 25 Copthall Avenue London EC2R 7BP -------------------------------------------------------- Message from: Birju.Prajapati(a)schneidertrading.com Message to: boost-users(a)lists.boost.org Attached files: 0 This e-mail and any files transmitted with it are confidential, may be legally privileged, and are for the sole use of the intended recipient. Copyright in this e-mail and any accompanying document created by us is owned by us. If you are not the intended recipient of this e-mail or any part of it please telephone our IT Department at the number shown above or by e-mail at info(a)schneidertrading.com. You should not use or disclose to any other person the contents of this e-mail or its attachments (if any), nor take copies. This e-mail is not a representation or warranty and is not intended nor should it be taken to create any legal relations, contractual or otherwise. Schneider Trading Associates Ltd (Registration No. 3692131) is incorporated in England and Wales and the registered office is at 25 Copthall Avenue, London EC2R 7BP. The company is authorised and regulated by the Financial Services Authority

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How to access each elements of a thread group separately
by Johan Mazel 24 Feb '09

24 Feb '09

Hi I'm using several threads to do some parallel work. But I need to stop them separatly through the interrupt method. In order to store all these threads, I thought that I would use the thread_group class since I cannot use the vector class. But it looks like I cannot acces an element of a thread group (to interrupt it separately for example). Is there anyway of doing this that I'm not aware of ? Thanks in adavnace for the help. Johan Mazel

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boost::serialization - track_never, load and save in cpp file?
by Martin Trappel 24 Feb '09

24 Feb '09

Hi. To support the serialization of a class I don't want to change anything, I have added free save and load function. (See the test code below.) It compiles and appears to work. I have the following questions: * Is it OK to put the save & load definitions in a separate implementation file? * Is it OK to specify track_never in a cpp file? Will this cause problems if someone else tries to serialize a map<int, string> ? thanks! - Martin - global_serialization.h - // ... class MyComplexClass; // ... namespace boost { namespace serialization { // Declare save and load for MyComplexClass template<class Archive> void save(Archive & ar, const MyComplexClass& t, unsigned int version); template<class Archive> void load(Archive & ar, MyComplexClass& t, unsigned int version); } } // Split: BOOST_SERIALIZATION_SPLIT_FREE(MyComplexClass); ***** - complex_class_serialization.cpp - // ... #include "ComplexClass.h" // ... typedef std::map<int, std::string ser_map_t; BOOST_CLASS_TRACKING(ser_map_t, boost::serialization::track_never); namespace boost { namespace serialization { template<class Archive> void save(Archive & ar, const MyComplexClass& t, unsigned int version) { // the relevant information to be serialized for // instances of MyComplexClass can be represented // by a map<int, string> ser_map_t m; // ... fill m object from t object ar << m; // Serialize } template<class Archive> void load(Archive & ar, CBoxHandler & t, unsigned int version) { ser_map_t m; ar >> m; // ... init t object from m } } // namespace serialization } // namespace boost

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[mpl & type_traits]
by Robert Jones 24 Feb '09

24 Feb '09

Simple questions from a metaprogramming newbie... Why do we have mpl::true_ and true_type? Are they interchangable? Is is_same the same as mpl::equal? Thanks, Rob.

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Problem with regular expression's validity and matching
by Paulino De Assis Fong 24 Feb '09

24 Feb '09

Hi, I have two problems that I would need some help. Thanks in advance. Question 1: Please consider the regular expression to match US phone number below: ((\(\d{3}\)?)|(\d{3}))([\s-./]?)(\d{3})([\s-./]?)(\d{4}) boost doesn't like it and it will throw an exception for the code below while it seems to be fine in online regex tester and .Net Regex library. I don't know what is imcompatiable with boost regex library. Please advice. try { boost::wregex expr(csRegex, boost::regex::normal | boost::regbase::icase); } catch (boost::exception const& e) { } Question 2: Please consider the regular expression to match US SSN below: (?!000)([0-6]\d{2}|7([0-6]\d|7[012])) ([ -])? (?!00)\d\d([ -|])? (?!0000)\d{4} It didn't throw an exception for this regular expression but it wasn't able to match any SSN at all in any format while it matches fine using other regular expression engine. Am I missing something? if (expr.expression()) { // Boost Regex usage flags boost::regex_constants::match_flag_type flags = boost::regex_constants::match_normal; // Start the boost regular expression iterator boost::wcregex_iterator start(boost::make_regex_iterator (StringToMatch, expr, flags)), end; while (start != end) { boost::match_results<const wchar_t*> match = *start; . . . } }

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Boost's automatic selection of debug vs release libaries on link - how to disable?
by Damien Hocking 24 Feb '09

24 Feb '09

Hello everyone, I've noticed that when linking Boost libraries, the linker implicitly knows whether it requires a debug or a release Boost library, and what the full name of the library is. E.g. on Windows the linker wants "boost_serialization-vc80-mt-d-1_37.lib" in debug and "boost_serialization-vc80-mt-1_37.lib" in release. I'm working in an SCons build system where SCons runs the show and the Boost libraries will be custom-renamed and the linker told specifically what libraries to link. Is there any way to disable this implicit naming feature in the bjam build step through a compiler option? Damien

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Release notes for Boost.Test
by Ross Boylan 24 Feb '09

24 Feb '09

http://www.boost.org/doc/libs/1_38_0/libs/test/doc/html/intro.html says --------------------------------- Release notes For more details see complete release notes. --------------------------------- There are no hyperlinks in that text. What is this referring to? It does not seem to be the global release notes, which don't mention changes in test even when they occurred (e.g., 1.33). Nor can I find something in the docs for test, or groping around in the svn source tree. Ideally, I'd like a history of changes across different releases, so I know what I need to make my code compatible with the different versions. I'm hoping for something a little higher level than svn diff. Thanks. Ross Boylan

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