- Boost-users - lists.boost.org

serialize a boost::array
by Hansi 02 Apr '08

02 Apr '08

Hello, I have a question regarding to serialize a boost::array. I have searched in the headers of serialize but I can't find some header which I can include to solve the problem. Is there a header availaible in boost 1.34.1? Best regards Hansjörg

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Memory debugging
by Sharad Mittal 02 Apr '08

02 Apr '08

Hello, I am writing an application using mingw and boost (threads, multi-index, etc). I am searching for a memory debugger (leaks, buffer overruns) for this configuration. 1) I tried duma but not sure how to use it. It kept stopping in a "new" call inside boost. 2) couldn't get dmalloc to run properly. Error "dmalloc library has gone recursive". Has anyone used any memory debugger reliably with mingw and boost? Thanks, Sharad

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Re: [Boost-users] serial programs + other IO types?
by Daniel Lidström 02 Apr '08

02 Apr '08

> > > On Mon, Mar 31, 2008 at 9:13 PM, Tim Michals > <tcmichals(a)msn.com> wrote: > > >> There is a new project on sourceforge ASIO > > >> http://sourceforge.net/projects/rs232basedonasi/ that > is serial based... it > > >> is coming online soon... > > > This is great! I would like to see some tutorials/documents on how to implement other IO types within the ASIO framework. For example, we communicate with CAN-based devices and it would be extremely useful (I think) to do this with ASIO. Is ASIO limited to IO only? For example, I can think of an asynchronous "event" that listens to changes in the filesystem. It seems this could be implemented in much the same way as IO types within ASIO. What do you think? -- Daniel

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BoostCon'08 Early Registration Deadline
by David Abrahams 02 Apr '08

02 Apr '08

Reminder: early registration for BoostCon'08 closes Monday, April 7. It's still not too late to avoid the late registration fee for what may be the finest C++ event of 2008. For the 2nd annual Boost C++ libraries conference, we've put together a fantastic program crowned by a keynote address from Bjarne Stroustrup. In addition to existing Boost libraries, we're covering technology of interest to any C++ developer trying to stay on the cutting edge, including hands-on sessions with features from the upcoming 2nd version of the C++ standard. This year we've also added a collection of short "author's corner" sessions for those of you who want an inside perspective on how advanced libraries are developed. See http://www.boostcon.com/program for details. BoostCon 2008 will be hosted at Aspen Center for Physics, one of the most beautiful meeting sites in the world, and a great venue for collaboration and discovery. The combination of a relaxed pace and intense inquiry made BoostCon'07 an event to remember, and we expect no less for this year. Please visit http://www.boostcon.com/registration to register. Thanks! -- The BoostCon Planning Committee David Abrahams Joel de Guzman Jeremy Siek Beman Dawes Eric Niebler Matthias Troyer Jeff Garland Sean Parent

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Dijkstra in a multi-graph (parallel edges)
by Ioannis Nousias 01 Apr '08

01 Apr '08

Hello, I'm using dijkstra_shortest_paths() in a multi-graph, which seems to work fine. Via the predecessor map I get the vertices in the shortest path. However, how do I get the edges of the shortest path, bearing in mind this is a multi-graph (has parallel edges)? thanks Ioannis PS: is this the right mailing list to ask these sort of questions ? -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.

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[Filesystem] operator/ vs operator/=
by Greg Schmid 01 Apr '08

01 Apr '08

I have a string class (tstring) which takes care of narrow <=> wide string conversions, and which provides operators for conversion to std::string and std::wstring: operator std::wstring &(); operator std::string &(); operator const std::wstring &() const; operator const std::string &() const; In Boost 1.33, I could do the following: boost::filesystem::path dir ("/foo"); tstring file ("bar"); boost::filesystem::path p = dir / file; In Boost 1.35, this no longer works; VS8 gives error C2679: binary '/' : no operator found which takes a right-hand operand of type 'const tstring' (or there is no acceptable conversion). However, if I change it to boost::filesystem::path p = dir; p /= file; then all is well. Also, boost::filesystem::path p = dir / std::string(file); boost::filesystem::path p = dir / boost::filesystem::path(file); work just fine. I don't understand the C++ type conversion rules well enough to understand why the conversion to std::string can happen automatically with operator/= but not operator/. I'd rather not have to specify the cast, as the original form of the code is much cleaner. Suggestions? Greg Schmidt (gregs(a)trawna.com) Trawna Publications

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Refactoring
by Jean Vittor 01 Apr '08

01 Apr '08

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, I'm trying to write a parser which can write on the input string (mainly insert string at the current position). Does spirit contain any stuff that can help me in that way ? Thanks, Jean -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Mandriva - http://enigmail.mozdev.org iD8DBQFH8fODQ0w7PvnJLt4RAnzxAJ4zbimcHG9G6IvCusqcZ6OXBS+cKQCcDsIL 6nhnvOMeJisGXPNjT/0c5Hs= =lH7Z -----END PGP SIGNATURE-----

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serialization, change from 1.34 to 1.35? (BOOST_CLASS_EXPORT problem)
by Filip Peters 01 Apr '08

01 Apr '08

Hi All, I'm upgrading some code from 1.34 to 1.35. I seem to have problem with BOOST_CLASS_EXPORT macro... according to the help files: http://www.boost.org/doc/libs/1_35_0/libs/serialization/doc/special.html >>>>If no archive headers are included - no code should be instantiated. This will permit BOOST_CLASS_EXPORT to be a permanent part of the my_class.hpp .<<<< my code is structured like that, header file for each class, this also has the export macro, one dll contains the archive includes (#include <boost/archive/binary_iarchive.hpp>), other dll's don't contain the archive code, but do need to use my classes... Now, the other dll's can't compile anymore, I get compile errors like: boost\boost\serialization\type_info_implementation.hpp(48) : error C2027: use of undefined type 'boost::serialization::extended_type_info_impl<T>' some info: boost 1.35, visual studio 2005, sp1 Are there any obvious changes to the serialization code that necessitate changes? thanks, Filip Peters ____________________________________________________________________________________ You rock. That's why Blockbuster's offering you one month of Blockbuster Total Access, No Cost. http://tc.deals.yahoo.com/tc/blockbuster/text5.com

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[GIL] Level 4 warnings on VC8
by John Femiani 01 Apr '08

01 Apr '08

I am trying to compile my code on VC8 at warning level (Level 4). There are several places in boost that produce warnings at this level, but the warnings have obvious simple fixes. (I can send a patch to this list when I have removed enough of them from my working copy in case the library authors care to address them). Along these lines I have a question/comment about GIL. The library uses a GIL_FORCEINLINE macro, presumably to increase performance of some functions. When I compile I get a slew of warning messages with warning "C4714 : function 'function-name' marked as __forceinline not inlined.". I am compiling whith /O2 option (Optimize for speed) and the /Ob2 flag (inline any suitable funciton). My question is: is this a problem for GIL? Obviously the authors have been trying hard to get that function call overhead removed and apparantly vc8 does not play nice with them. I don't know how to address this warning other than to temporarily disable warning 4714, but this is a case where the warning looks like it may be important. The warning indicates that the compiler is unable to inline the functions at these locations: c:\john\hvm\src\boost\boost\gil\algorithm.hpp(251) : copy_with_2d_iterators c:\john\hvm\src\boost\boost\gil\algorithm.hpp(587) : default_construct_range In my case the functions point me to locations in the STL: C:\Program Files\Microsoft Visual Studio 8\VC\include\functional(54) Unfortunately I can not list my code that exhibits the problem here (these warnings come from a large unreleasable project compiled with W3 in the past, and the messages don't help me find which specific parts of my code are instantiating the gil code). I am hoping that the authors will immediately understand the issue (since they used GIL_FORCEINLINE to begin with). Cheers, --John C. Femiani

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[python] can I store reference to c++ shared_ptr instance in python list ?
by Kamil Zubair 01 Apr '08

01 Apr '08

Hi, I'm trying to do this : Python: ptr_list=[] def func(ptr, msg): if "insert"==msg: ptr_list.append(ptr) elif "remove"==msg: ptr_list.remove(ptr) C++: class MyClass{}; int main() { //initialize python exec_file("func.py", global, global); //func.py is the code above object func = global["func"]; shared_ptr<MyClass> mc(new MyClass()); func(mc, "insert"); func(mc, "remove"); } My question is how do I expose my class to python ? I tried class_<MyClass, shared_ptr<MyClass> >("MyClass") but it always fails when I tried to remove an already inserted mc. --------------------------------- You rock. That's why Blockbuster's offering you one month of Blockbuster Total Access, No Cost.

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