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Boost::Variant
by Akim Demaille 12 Dec '03

12 Dec '03

What is the status of Boost::Variant? It used to be documented in replicas of the real Boost documentation, but now these sites seem to be closed, and I can't find any information on boost.org. Thanks!

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Need linking help for boost::filesystem
by Scott Meyers 12 Dec '03

12 Dec '03

I'd like to play with boost::filesystem, and this turns out to be the first boost library I've tried to use that requires that I build something first. I downloaded bjam, and it appears that I have successfully built filesystem libraries for the compilers I care about (VC6, VC7.1, gcc, and como), because there is a subdirectory for each of them under the libboost_filesystem.lib directory, and each subdirectory, if you push down far enough, has .obj files under both debug and release. But I can't get anything to link. I can get the sample filesystem app (simple_ls.cpp) to compile cleanly under all compilers, but nothing will link. It seems clear that I somehow need to tell the linker where to find the appropriate filesystem libraries, but I'm not sure where to point it. Help? I'm running Windows 2000. Thanks, Scott

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newbie BGL problem: core dump due to graph size
by duccio.medini＠tin.it 12 Dec '03

12 Dec '03

Hi all. I am calculating the connected components of af graph with a c++ code written with BGL. My graph is huge (4E+05 vertexes, 10^6 ~ 10^8 edges). The code uses the connected_components algorithm (or, in a different version, directly the depth_first_visit one) and works well up to a "reasonable" number of edges in the graph. Over this threshold it core dumps. I have the same problem both on SPARC Solaris 9 g++3.2.2 and on Intel Linux 2.4 g++3.1 . I know that it should not be a problem of the RAM memory available on the system (or addressable form a single istance). I am able to use up to 6-7 GBs of RAM, and it tipically core dumps at 2.5-5 GBs. I suspect that I'm violating some intrinsic size limit in the BGL adjacency_list class or similar. Are there such limits, and can they be extended? Any clue would be really appreciated. Thanks in advance! Duccio Medini

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Shared_ptr and constness
by cyril.godart＠bnpparibas.com 12 Dec '03

12 Dec '03

Hi, Just out of curiosity. I am increasingly using the smart_ptr and more specifically the shared_ptr but I came to realize that actually it rather violently breaches the constness rules. The example below is one of the many things you can do with a shared pointer that is forbidden with a naked pointer. As the shared_ptr penetrates even further in my code I come to realize that what I am gaining on the comfort side I loose on the safety. Clearly, that's my call but I was curious to know if it is a known fact that it is impossible to enforce constness rules. Cyril Godart Quantitative Analyst BNP Paribas. struct A { int bar; }; typedef boost::shared_ptr<A> A_ptr_t; void foo(const A_ptr_t& a) { a->bar++;//semantically this should not be possible. } int main(int argc, char* argv[]) { A_ptr_t a(new A); a->bar = 1; foo(a); return 0; } This message and any attachments (the "message") is intended solely for the addressees and is confidential. If you receive this message in error, please delete it and immediately notify the sender. Any use not in accord with its purpose, any dissemination or disclosure, either whole or partial, is prohibited except formal approval. The internet can not guarantee the integrity of this message. BNP PARIBAS (and its subsidiaries) shall (will) not therefore be liable for the message if modified. --------------------------------------------- Ce message et toutes les pieces jointes (ci-apres le "message") sont etablis a l'intention exclusive de ses destinataires et sont confidentiels. Si vous recevez ce message par erreur, merci de le detruire et d'en avertir immediatement l'expediteur. Toute utilisation de ce message non conforme a sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. L'internet ne permettant pas d'assurer l'integrite de ce message, BNP PARIBAS (et ses filiales) decline(nt) toute responsabilite au titre de ce message, dans l'hypothese ou il aurait ete modifie.

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ISO C++ does not support `long long'
by Joshua Moore-Oliva 11 Dec '03

11 Dec '03

When compiling programs that use boost, I get multiple warnings along these lines.. /home/josh/boost/type_traits/is_convertible.hpp:274: warning: ISO C++ does not support `long long' /home/josh/boost/type_traits/is_convertible.hpp:274: warning: ISO C++ does not support `long long' In file included from /home/josh/boost/iterator_adaptors.hpp:125, from /home/josh/boost/token_iterator.hpp:15, from /home/josh/boost/tokenizer.hpp:21, Am I doing something wrong? do I need to #define something? Using FreeBSD 4.9, gcc 3.2.3. Thanks, Joshua Moore-Oliva

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filesystem::copy_file throws -- but why?
by Scott Meyers 11 Dec '03

11 Dec '03

I'm trying to use copy_file to, well, copy a file to a backup file (signified by adding ".bak" to the file's name). Here's what I'm doing, chopped way down: int processFile(const fs::path& fileName) { fs::path copyFileName(fileName.native_file_string() + ".bak"); fs::copy_file(fileName, copyFileName); } This throws an exception: boost::filesystem::path: invalid name "D:\Temp\CDFix\INDEX.HTM.bak" in path: "D:\Temp\CDFix \INDEX.HTM.bak" I don't see what's invalid about this name. From what I can tell, I'm fulfilling copy_file's preconditions and not falling into one of the cases where it's supposed to throw. What am I doing wrong? Thanks, Scott

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RE: [Boost-users] Re: Re: Need linking help for boost::filesystem
by Ben Hutchings 10 Dec '03

10 Dec '03

Scott Meyers <Usenet(a)aristeia.com> wrote: > > Try a slight variation: > > > > cl /TP /W4 /WL /GX /GR -ID:\C++\Boost\Current simple_ls.cpp > > %BOOST_FILESYSTEM_LIB% > > Alas, that doesn't help. I still get multiply defined symbols. > This is with 1.30.2. It looks like your program and the filesystem library are built against different versions of the C/C++ run-time library. Under the control of #pragma directives, Visual C++ compiler can insert references into object files that tell the linker which libraries to link with. In this case the linker tries to link with both run-time libraries and finds conflicting definitions. Check that you're linking with the right build of the filesystem library. > Is there any reason to expect that the > problem will magically go away if the get the CVS version? Perhaps. The Boost headers are now using the abovementioned pragma to (hopefully) select the right library to link with. Ben.

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Need linking help for boost::filesystem
by Witz 10 Dec '03

10 Dec '03

I had the same problem on VC7.1 - multiply defined symbols and thought i was just being dumb - with Scott having the same problem, maybe i wasn't :) I got round it by including the source files in the project i was working on - not the solution i'd have liked but it has the benefit of working and allowing me to get on with doing my 'proper' coding. So, are we going to be seeing 'Effective Boost' in the near future then Scott? :) Ian Whittley

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RE: [Boost-users] Re: newbie question: graph library with gcc 3.2.1
by Vikram Anantha 09 Dec '03

09 Dec '03

Answered my own question. I replaced libbgl-viz with bgl-viz in lib/graph/example/Jamfile. I seem to be getting a little further. I'll get back with the other harder questions. Didn't want to waste people's time with questions I can answer myself :) Thanks Vik -----Original Message----- From: Vikram Anantha Sent: Tuesday, December 09, 2003 9:56 AM To: Boost Users mailing list Subject: RE: [Boost-users] Re: newbie question: graph library with gcc 3.2.1 I am using the released version 1.30.2. I had to make a change to the lib/graph/Jamfile.v2 as detailed in this email http://aspn.activestate.com/ASPN/Mail/Message/boost/1802962 in order to make the graph library compile. If at all possible, I would like to not use the current snaphot on CVS and make small local changes based on the released version. If possible, could somebody give me a little diff on the jamfile or something like that. Also, Volodya, Do your changes fix the problem with the graph examples failing or do they fix the warnings in the graph library? Thanks Vik -----Original Message----- From: Vladimir Prus [mailto:ghost@cs.msu.su] Sent: Monday, December 08, 2003 10:13 PM To: boost-users(a)lists.boost.org Subject: [Boost-users] Re: newbie question: graph library with gcc 3.2.1 Hi Vikram, > I tried building the graph library and the graph examples with bjam. I > am using gcc 3.2.1 on Solaris 2.8. > > The library seemed to build successfully but did have warnings. The > examples failed to build complaining that it could not find the > dependent graph library which seems to be a problem with my > LD_LIBRARY_PATH or something like that. The build outputs for both > cases are given below. I did not do any customizing for either of > these builds. My cmd line was bjam "-sTOOLS=gcc" > > Any help is appreciated. Thanks in advance What version of Boost are you using? If it's CVS version, then you might try to run "cvs up" now and try again. I've fixed some typos which were causing the above error. - Volodya _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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RE: [Boost-users] Re: newbie question: graph library with gcc 3.2.1
by Vikram Anantha 09 Dec '03

09 Dec '03

I am using the released version 1.30.2. I had to make a change to the lib/graph/Jamfile.v2 as detailed in this email http://aspn.activestate.com/ASPN/Mail/Message/boost/1802962 in order to make the graph library compile. If at all possible, I would like to not use the current snaphot on CVS and make small local changes based on the released version. If possible, could somebody give me a little diff on the jamfile or something like that. Also, Volodya, Do your changes fix the problem with the graph examples failing or do they fix the warnings in the graph library? Thanks Vik -----Original Message----- From: Vladimir Prus [mailto:ghost@cs.msu.su] Sent: Monday, December 08, 2003 10:13 PM To: boost-users(a)lists.boost.org Subject: [Boost-users] Re: newbie question: graph library with gcc 3.2.1 Hi Vikram, > I tried building the graph library and the graph examples with bjam. I > am using gcc 3.2.1 on Solaris 2.8. > > The library seemed to build successfully but did have warnings. The > examples failed to build complaining that it could not find the > dependent graph library which seems to be a problem with my > LD_LIBRARY_PATH or something like that. The build outputs for both > cases are given below. I did not do any customizing for either of > these builds. My cmd line was bjam "-sTOOLS=gcc" > > Any help is appreciated. Thanks in advance What version of Boost are you using? If it's CVS version, then you might try to run "cvs up" now and try again. I've fixed some typos which were causing the above error. - Volodya _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

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