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

Smart pointers
by Olivier Tournaire 10 May '07

10 May '07

Hi all Suppose I have two classes A and B like those ones : class A { // ... B *m_b; }; class B { // ... std::vector<A *> m_a; }; m_b is used to know who is the parent of the object. I would like to use smart pointers. How can I do this ? Thanks in advance -- Le temps des cerises reviendra. Dans l'immédiat, c'est le temps des noyaux. Courage.

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[Serialization] problem linking on Windows using Visual Studio and SCons
by Ben Kirk 10 May '07

10 May '07

I've looked everwhere I know to look (MSDN, SCons archive, Boost archive, etc) and tried tweeking my code every way I know how (and countless other suggestions found Googling), but for some reason I cannot get boost_serialization lib to link into my application. If I build with -DBOOST_SERIALIZATION_NO_LIB, I get LNK2005/LNK2019 errors. MSDN says these are CString related, but their "solution" is only for MFC - which won't work with my setup... I'm using SCons to build my "Custom Makefile" QT application - Visual Studio is basically just an editor for my environment. If I leave off -DBOOST_SERIALIZATION_NO_LIB, I get LNK1104 (can't open Boost Serialization lib file)... even though the path to the Boost Serialization lib is explictily listed on the command line (and it is there)! I think this could have something to do with Microsoft's auto-linking, but I'm not 100% sure. Any pointers would be greatly appreciated. Best wishes, Ben

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[program_options] link error
by Scott Finley 10 May '07

10 May '07

I am trying to use boost.program_options, but I'm getting a link error: undefined reference to `boost::program_options::options_description::options_description(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned int)' I compiled boost 1.33.1 normally on linux with gcc, and I don't see a libboost_program_options or some such to link against. I don't see anything in the documentation on boost.org about what I should link with. I also don't have any source in BOOST_BASE/libs/program_options which would explain why there is no library. The documentation also mentions /libs/program_options/examples which I don't have. Do I need to download the .cpps for this separately? Is this included in another library I need to link with? -- /************************************** * Scott Finley * Research Software Engineer * TomoTherapy Inc. * Email: sfinley(a)tomotherapy.com * Phone: 608.824.3381 ***/

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templated class member
by Ares Lagae 10 May '07

10 May '07

I have a list of fundamental types (known at compile time). For each of these types I want to declare a templated member in a class. So, instead of class foo { private: int int_variable; double double_variable; ... /* rest of types */ }; I want something like class foo { private: variable_list<int, double, ... /* rest of types */> variable; }; and then access "foo::variable" with a template-like syntax. E.g. "variable.get<int>()". Does anyone have any idea how I can accomplish this? -- Ares Lagae Computer Graphics Research Group, Katholieke Universiteit Leuven http://www.cs.kuleuven.be/~ares/

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[asio] bug report
by Scott Finley 10 May '07

10 May '07

I have found what appears to be a bug in ASIO. From boost/asio/detail/socket_select_interrupter.hpp, starting on line 53: sockaddr_in4_type addr; socket_addr_len_type addr_len = sizeof(addr); addr.sin_family = AF_INET; addr.sin_addr.s_addr = inet_addr("127.0.0.1"); addr.sin_port = 0; if (socket_ops::bind(acceptor.get(), (const socket_addr_type*)&addr, addr_len, ec) == socket_error_retval) { boost::system::system_error e(ec, "socket_select_interrupter"); boost::throw_exception(e); } addr needs to be cleared before it is used. The failure to do this caused the bind call to fail for me on VxWorks 6.4. I inserted the following line right after the delcaration of addr: bzero((char *)&addr, sizeof(sockaddr_in4_type)); This solved the problem for me. -- /************************************** * Scott Finley * Research Software Engineer * TomoTherapy Inc. * Email: sfinley(a)tomotherapy.com * Phone: 608.824.3381 ***/

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Re: [Boost-users] [1.34.0] Release Candidate
by David Abrahams 10 May '07

10 May '07

on Thu May 10 2007, Thomas Witt <witt-AT-acm.org> wrote: > Just in case you're wondering this post was not meant to be empty. > > As mentioned earlier the answer is in > > http://www.boost.org/more/getting_started.html#Tools Thomas, I'm confused. I don't think anything in that table is very relevant to 1.34.0, since we're using BBv2 now. > Autodetect did not make it for 1.34.0 Whoops, really? You mean of version numbers? My documentation change says that autodetection works for gcc and msvc. Was I incorrect? I thought you let Rene check in the fix for msvc. -- Dave Abrahams Boost Consulting http://www.boost-consulting.com Don't Miss BoostCon 2007! ==> http://www.boostcon.com

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libboost-regex-1.33.1 problem with regex_merge
by Bruno.Voigt＠ic3s.de 10 May '07

10 May '07

Hi all, I have a problem with an application build with the current debian/etch libboost-regex lib. I am not sure if the problem results from an intended behaviour change of the regex lib or if its a bug of either the regex lib or the debian package. The following test app worked flawlessly with several older boost regex versions and I would like to understand why it doesn't work anymore using the lib from debian/etch. Do I have to adjust the invocation parameters of boost_merge for the current version? I do not unnecessarily want to force the users of my production apps to have to update their match patterns over dozens of cfg files from "(.*)" to "^(.*)$". TIA for any hints, Bruno -- bruno.voigt(a)ic3s.de // debian/etch: dpkg -l *boost* // ii libboost-dev 1.33.1-10 Boost C++ Libraries development files // ii libboost-regex-dev 1.33.1-10 regular expression library for C++ // ii libboost-regex1.33.1 1.33.1-10 regular expression library for C++ // ii libboost-thread-dev 1.33.1-10 portable C++ multi-threading // ii libboost-thread1.33.1 1.33.1-10 portable C++ multi-threading // // build: g++ -lboost_regex regex_merge_test.cpp // #include <cstdlib> #include <string> #include <iostream> #include <boost/shared_ptr.hpp> #include <boost/regex.hpp> using namespace std; int main(void) { string my_regex("(.*)"); // doesnt't work (worked with previous boost regex versions) //string my_regex("^(.*)$"); // works string my_replace("\\+$1"); string my_string("123"); try { boost::regex my_regex_comp(my_regex); try { string my_result = boost::regex_merge(my_string, my_regex_comp, my_replace); cout << "boost::regex_merge result: " << my_result << endl; // I get a trailing + character: +123+ // I expected as in earlier liiboost-regex versions: +123 exit(0); } catch(...) { cout << "boost::regex_merge exception" << endl; } } catch(...) { cout << "boost::regex()exception" << endl; } exit(1); }

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Having trouble including my static library (which uses regex) in my MFC app
by Martin Zeng 10 May '07

10 May '07

Hi guys, I have a static library in which I have included the boost regex header. This static library compiles fine with no errors. But then I want to use this static library in an MFC application I made. I keep getting the following linking error: error LNK2005: "public: static unsigned int __cdecl std::char_traits<unsigned short>::length(unsigned short const *)" (?length@?$char_traits@G@std@@SAIPBG@Z) already defined in msvcprtd.lib(MSVCP71D.dll) What is the problem and how can I solve it? Thanks -- This email is from Civica Pty Limited and it, together with any attachments, is confidential to the intended recipient(s) and the contents may be legally privileged or contain proprietary and private information. It is intended solely for the person to whom it is addressed. If you are not an intended recipient, you may not review, copy or distribute this email. If received in error, please notify the sender and delete the message from your system immediately. Any views or opinions expressed in this email and any files transmitted with it are those of the author only and may not necessarily reflect the views of Civica and do not create any legally binding rights or obligations whatsoever. Unless otherwise pre-agreed by exchange of hard copy documents signed by duly authorised representatives, contracts may not be concluded on behalf of Civica by email. Please note that neither Civica nor the sender accepts any responsibility for any viruses and it is your responsibility to scan the email and the attachments (if any). All email received and sent by Civica may be monitored to protect the business interests of Civica.

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[iostreams] zlib_compressor memory leaks in 1.34.0 (release candidate)
by Thomas Pintaric 10 May '07

10 May '07

I noticed that RC_1_34_0 contains an outdated version of /boost/boost/iostreams/filter/zlib.hpp (CVS revision 1.25) which is known to cause memory leaks. On the RC_1_33_0 branch, the problem has apparently been fixed (*) by the author. However, the fix (CVS revision 1.25.2.1) was never merged with the MAIN branch. (*) see: http://boost.cvs.sourceforge.net/boost/boost/boost/iostreams/filter/zlib.hp… You may want to fix this before the final 1.34.0 release. Regards, --Thomas

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[1.34.0] Release Candidate 2
by Thomas Witt 10 May '07

10 May '07

Hi, 1.34.0 release candidate 2 is now available from http://www.boost.org/ release/. It contains the following changes from RC1: - configure update from Doug Gregor - doc updates from John Maddock - read_write_mutex sources removed by Anthony Williams Please give it a try and report any problems to the developer list or directly to me. Unless it's broken in a major way it'll be released unchanged on Friday May 11. Thanks Thomas -- Thomas Witt witt(a)acm.org

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