December 2006 - Boost-users - lists.preview.boost.org

Re: [Boost-users] Auto-linking + serious Xplatform dev =>mutuallyexclusive?
by Sohail Somani 08 Dec '06

08 Dec '06

> [mailto:boost-users-bounces@lists.boost.org] On Behalf Of John Maddock > > It's only useful if your compiler supports it, period. > > However, those compilers that do support it typically have a > number of > different binary-incompatible build variants: figuring out > which lib variant > to link against without it in those cases is tricky, this is > a frequent > cause of problem reports caused by picking the wrong variant. I guess none of this is really news to me. Thanks for your reply.

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Newbie to boost
by fungos 08 Dec '06

08 Dec '06

Hi, I need help to get started with boost, Im trying about some time to get a little project mine converted to use boost libs. My current project uses raw pointers and std::map. But I want to use shared_ptr and multi_index_container. I cant find help anywhere to my problems with this code, I hope I can get some here. Project Outline: - Strict OO design. - Filesystem emulation (a simple fake filesystem...) - I have one Filesytem interface with one implementation. - I have one Entry interface with three implementations. - Directory is a Entry. - File is a Entry. - Empty is a Entry. See the sample here: http://rafb.net/paste/results/hfHOx934.html , I have done this little sample to start understunding multi_index_container with classes using methods (mem_fun) as "selectors?". What is wrong with it? Please, I really need help to start with boost. But I doesnt want to let use best practices like good design and patterns. Thanks -- Animal Frontline Liberation

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Auto-linking + serious Xplatform dev => mutually exclusive?
by Sohail Somani 08 Dec '06

08 Dec '06

Hi, For serious cross-platform development, have boost users found the auto-linking to be useful? I think it only works on Windows, so if you're doing any serious cross-platform development, the feature isn't really that useful. Am I missing something? Is this only useful on Windows? I'd love for it to work in general, but I think I have to replicate the logic in my build system which means I shouldn't really use it on Windows (since my logic will already be there). Of course, thats not to say that the feature isn't generally useful. If I was a Visual C++ developer only, I'd use it, no questions asked. Thanks, Sohail

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boost::interprocess - allocating objects using node_allocator
by alexmark 08 Dec '06

08 Dec '06

Hi, I'd like to allocate objects directly in shared memory (not within STL-like container) in the way like that: struct X { int a; int b; }; typedef boost::interprocess::node_allocator<X, A_POOL_SIZE, managed_shared_memory::segment_manager > AllocType; int main (...) { // create shared memory managed_shared_memory sharm (create_only, "a_name", SOME_SIZE); // create allocator object AllocType alloc_object (sharm.get_segment_manager()); // allocate memory for object instance taking it from the allocator's pool X* p = detail::get_pointer(alloc_object.allocate(1)); // invoke the constructor alloc_object.construct(p, X()); // obtain the handle sharm.get_handle_from_address(p); // now the handle is passed to another application to let it access the shared object // .... } Is it correct to do so? Will it work? TYA

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Multiple definition linker errors
by Mark Ruzon 07 Dec '06

07 Dec '06

I have an executable with two .cpp files, each of which includes a header file that in turn includes boost headers. When I link them (gcc 3.2.3) I am greeted with multiple definition errors on somewhat random symbols like '(anonymous namespace)::_1' (through _9) from bind or equality operators in zip_iterator etc. All my header files are properly wrapped with #ifndefs, I have only one global variable that does not involve boost, and everything links fine for executables with only one .cpp file that includes this same header. I assume the fix lies with the gcc command line, either a missing flag or the order of arguments. Does anyone know how to fix this or what information would be useful in tracking this down? I'm out of ideas. Sincerely, Mark Ruzon

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Re: [Boost-users] [BGL] read_graphviz
by Dmitry 07 Dec '06

07 Dec '06

I don't see the way you read graph property?? "Jeffrey Holle" <jeffreyholle(a)bellsouth.net> wrote in message news:<el7jds$o4$1(a)sea.gmane.org>... So true. Thought brevity was more important. Jens Muller wrote: > Jeffrey Holle schrieb: >> Since no one replied to this message, I'll answer it myself. Yes, to >> both questions! >> This is the code that demonstrates: > > There are obviously includes missing in there. ----------

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[regex VC 7.1] multiple symbols in link
by Marko Bozikovic 07 Dec '06

07 Dec '06

Hi all, I'm looking into upgrading from Boost 1.32 to 1.33.1, but I have a problem with regex lib. When linking my application with the regex lib (I use automatic linking), I get multiple symbols linker error: libboost_regex-vc71-mt-gd-1_33_1.lib(usinstances.obj) : error LNK2005: "public: static unsigned int __cdecl std::char_traits<unsigned short>::length(unsigned short const *)" (?length@?$char_traits@G@std@@SAIPBG@Z) already defined in msvcprtd.lib(MSVCP71D.dll) libboost_regex-vc71-mt-gd-1_33_1.lib(usinstances.obj) : error LNK2005: "public: static bool __cdecl std::char_traits<unsigned short>::eq(unsigned short const &,unsigned short const &)" (?eq@?$char_traits@G@std@@SA_NABG0@Z) already defined in msvcprtd.lib(MSVCP71D.dll) With boost 1.32, everything works fine. In both 1.32 and 1.33.1, regex was built with bjam using VC 2003 compiler, default configuration (just ran bjam.exe "-sTOOLS=vc-7_1") STL library is the standard one, shipped with VS 2003. Any ideas? Thank you, -- Marko ICQ: 5990814 I'm not under the alkafluence of inkahol that some thinkle peep I am. It's just the drunker I sit here the longer I get.

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Boost.Python windows auto-linking
by David Abrahams 07 Dec '06

07 Dec '06

Boost's CVS HEAD now contains support for the auto-linking feature provided by most windows compilers (e.g. Visual C++). I'm very eager to hear whether it works for people, especially since we're getting very close to releasing Boost 1.34 Thanks, -- Dave Abrahams Boost Consulting www.boost-consulting.com

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bjam doesn't like filenames with '++' in them???
by Paul Kerchen 07 Dec '06

07 Dec '06

I'm using bjam for a project that needs to copy some third party dlls (ImageMagick) to an installation directory. One of those dlls has '++' in the filename, which, under Windows at least, is legal, but bjam can't seem to deal with it. This line: InstallInto $(BIN_INSTALL_DIR) : CORE_RL_Magick++_.dll ; results in this output: Install AppInstall\CORE_RL_Magick++_.dll The system cannot find the file specified. copy ImageMagick\CORE_RL_Magick++_.dll AppInstall\CORE_RL_Magick++_.dll ...failed Install AppInstall\CORE_RL_Magick++_.dll... ...failed updating 1 target... I've verified that the source file does exist and all of the other DLLs in the same directory are copied without a problem. I've tried several things to work around the problem: escaping the '+' characters, putting the whole filename in quotes, definining variables that I can use to construct a filename with. However, it seems to come down to InstallInto not being able to deal with '++' in filenames. And since this is a third party DLL, I can't simply rename the file. I've searched the Boost newsgroups and FAQs for an answer, but no one seems to have encountered this problem, so that leads me to believe that I'm doing something wrong. Has anyone had this problem before? Does anyone have any ideas on how to fix it? Any help with this would be greatly appreciated! Paul Kerchen

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Math library on the BOOST licence.
by Seweryn Habdank-Wojewódzki 07 Dec '06

07 Dec '06

Hi Are there any similar to GSL library which is designed using templates and on the BOOST license. I would like to join to such a project - I have developed Runge-Kutta generic solver maybe it can be useful, at present I preparing other designs, but maybe somewhere other is done. Regards. -- |\/\/| Seweryn Habdank-Wojewódzki `\/\/'

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