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Re: multitoken program_options in vc++6
by James E Taylor 31 Mar '05

31 Mar '05

> To begin with, do you realize the the variables_map class is seriously > broken with vc6 -- you can't call the 'as' method of the variable_value > class that variables_map::operator[] returns. > > Or you know some way around this? > > - Volodya I've been using the boost::any value directly to get around the as<> problem. Is there any way of getting multitoken values working? Thanks, James ___________________________________ NOCC, http://nocc.sourceforge.net

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regex_search: Lazy evaluation of iterators
by David McKelvie 31 Mar '05

31 Mar '05

In previous emails I complained that if one used an extended syntax regex on an InputIterator (or a BidirectionalIterator) then regex_search sought to the end of the iterator before returning the first match. This has obvious disadvantages if one wants to implement lazy matching of regexes on a potentially large input stream. My hypothesis about what is happening is: The seeking to the end is due to the extended syntax wanting to know which is the leftmost match. This is done by asking the distance between the matched substring and the 'end' of the sequence. If the iterator is an InputIterator then STL (at least the version I'm using from gcc 3.3.2) says, the only way I can do this, is to seek to the end of the sequence, to find how far away I am from the end. Thus, the problem. If I redefine the iterator as a RandomAccessIterator, and define operator-, and operator +=, then STL uses operator- to find the distance between the match and the end. Which is better, but still not ideal, as I'm assuming that I dont know at that point where the end is. I'll know when I get there, but not before. I suggest that a cleaner conceptual way of doing this would be to ask how far we are from the start of the iterator. My apologies for any inaccuracies in the above and my ignorance of earlier debates on this or related issues. David

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Re: [Boost-users] Link error Boost.Serialization
by Christian Heinemann 31 Mar '05

31 Mar '05

boost-users(a)lists.boost.org schrieb am 31.03.05 04:11:12: > > On Wed, 30 Mar 2005 13:06:32 +0100, Christian Heinemann wrote > > Hi, > > i want to use serialization library from boost. I'm enthused about > > the functionality. But when i try to compile and link the first > > example (which can be find on > > http://www.boost.org/libs/serialization/doc/index.html) i get the > > following error messages: > > (with g++ -o serialize serialize.cpp -lboost_serialization-gcc > > -I/usr/local/include/boost-1_32) > > It doesn't look like you've told the compiler where to find the serialization > library. You probably need the option: > > -L /usr/local/lib > > assuming that's where the serialization library is installed. The same error occur. I suppose there is a correlation between the link error and the 32bit and 64bit libraries installed on my system (x86_64). Is such a thing possible? There always two library-paths: lib and lib64. Boost is installed in lib. Christian ______________________________________________________________ Verschicken Sie romantische, coole und witzige Bilder per SMS! Jetzt bei WEB.DE FreeMail: http://f.web.de/?mc=021193

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multitoken program_options in vc++6
by James E Taylor 31 Mar '05

31 Mar '05

boost-users, I am trying to use multitoken arguments with MS Visual C++ 6. The problem is my multitoken option description is not being recognised, so when I run the program with more than one token after the --multi flag, I get an exception. A minimalist program is below. Please note the necessary hack of providing 5 args to po::parse_command_line, which I have to do to satisfy the vc6 compiler. I'm linking with libboost_program_options-vc6-sgd.lib Any help would be much appreciated. Thanks, James int main(int argc, char* argv[]) { po::options_description desc("Allowed options"); try { desc.add_options() ("multi", po::value<string>()->multitoken(), "multi token argument") ; po::variables_map vm; /* next line, have to pass 5 args to parse_command_line: seems to be */ /* a compiler problem in vc6 */ po::store(po::parse_command_line(argc, argv, desc, 0, po::ext_parser()), vm); po::notify(vm); cout << "parsed successfully" << endl; } catch ( const std::exception &e ) { cerr << e.what() << endl << desc << endl; return -1; } return 0; } -- James E Taylor ___________________________________ NOCC, http://nocc.sourceforge.net

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RE: [Boost-users] Errors Compiling exception
by Eyal Inbar 31 Mar '05

31 Mar '05

I done it and i get the same error . maybe the problem that the gcc is version 2.96 (Red Hat Linux 7.3 2.96-113)? -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org]On Behalf Of me22 Sent: Thursday, March 31, 2005 2:50 AM To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Errors Compiling exception On Wed, 30 Mar 2005 11:10:35 +0200, Eyal Inbar <eyalin(a)tadlys.com> wrote: > > > I'm trying to use dijkstra-example and i get > > /usr/local/include/boost/graph/dijkstra_shortest_paths.hpp:137: exception > handling disabled, use > > -fexceptions to enable > > I'm not sure what version i have but i have the folder /i386-glibc21-linux > if its help? > > eyal That's a g++ error message saying that "exception handling [is] disabled" and you need to add the command line switch "'-fexceptions' to enable [it]" in the call to g++ _______________________________________________ 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: MPL Question on crossing the compile \ runtimebarrier with bind | adding to boost profiler abstracted file access
by Brian Braatz 31 Mar '05

31 Mar '05

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org [mailto:boost-users- > > "Brian Braatz" <brianb(a)rmtg.com> writes: > > > I can always pass in a functor, but what I really want for Christmas is > > to be able to > > > > Tyepdef MyClass<std::ofstream, > > bind(&std::ofstream::open,_1,"MyFile.txt") > MyNewClass; > > > > This doesn't work because bind returns an actual OBJECT instead of a > > type. (intuitively - it would be cool if I could say > > bind(...)::Type which would give me the TYPE of the generated > > functor) > > > > SO that led me to be up until 3 am reading about mpl::lambda. I am still > > trying to determine if THAT can be used in place, but the dots are not > > connecting for me yet. > > > > Any suggestions or directions pointed GREATLY appreciated. > [Dave Abrahams Writes:] > You want "typeof," a mythical operator not yet in the C++ language -- > but many implementations support some form of it as an extension. > There's a prototype typeof library in the Sandbox files area now, by > Arkadiy Vertleyb and others. Check it out. I suggest you browse the > recent thread on typeof in boost-devel as well. [Brian Braatz Writes:] As always THANK YOU Dave What about the boost\Lambda.bind vs MPL bind?. Is there a way to write the Tyepdef MyClass<std::ofstream,bind(&std::ofstream::open,_1,"MyFile.txt") MyNewClass; As a MPL driven expression, or is the "typeof" the only option (I am ignoring the hand coded functor option). (I am asking partially because I am having a hard time "seeing" the difference between the MPL lambda and the boost lambda- I will keep re-reading the MPL book... :) ) (also don't get me wrong, the typeof looks very cool- I am just trying to connect the dots) ALSO I REALLY WISH I could pass strings to templates, maybe if I am lucky Santa will join the C++ committee....... Thanks again Brian

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Link error Boost.Serialization
by Christian Heinemann 31 Mar '05

31 Mar '05

Hi, i want to use serialization library from boost. I'm enthused about the functionality. But when i try to compile and link the first example (which can be find on http://www.boost.org/libs/serialization/doc/index.html) i get the following error messages: (with g++ -o serialize serialize.cpp -lboost_serialization-gcc -I/usr/local/include/boost-1_32) "/usr/local/lib/gcc/x86_64-unknown-linux-gnu/3.4.3/../../../libboost_serialization-gcc.a(basic_iarchive.o)(.text+0x1ef): Infunction `boost::archive::detail::basic_iarchive::~basic_iarchive()': : undefined reference to `std::__default_alloc_template::_S_force_new' /usr/local/lib/gcc/x86_64-unknown-linux-gnu/3.4.3/../../../libboost_serialization-gcc.a(basic_iarchive.o)(.text+0x254): Infunction `boost::archive::detail::basic_iarchive::~basic_iarchive()': : undefined reference to `std::__default_alloc_template::_S_force_new' /usr/local/lib/gcc/x86_64-unknown-linux-gnu/3.4.3/../../../libboost_serialization-gcc.a(basic_iarchive.o)(.text+0x279): Infunction `boost::archive::detail::basic_iarchive::~basic_iarchive()': .... (~ 10 Pages) " And with "g++ -o serialize serialize.cpp -lboost_serialization-gcc -I/usr/local/include/boost-1_32 -lboost_thread-gcc-mt" only: "`.gnu.linkonce.t._ZNK5boost7archive17archive_exception4whatEv' referenced in section `.rodata' of /usr/local/lib/gcc/x86_64-unknown-linux-gnu/3.4.3/../../../libboost_serialization-gcc.a(basic_iarchive.o): defined in discarded section `.gnu.linkonce.t._ZNK5boost7archive17archive_exception4whatEv' of /usr/local/lib/gcc/x86_64-unknown-linux-gnu/3.4.3/../../../libboost_serialization-gcc.a(basic_iarchive.o) " I use Boost at first time and i'm going to despair.. Maybe it is important: i have installed Boost with gcc 3.4.3 on SuSE 9.2 (x86_64). With gcc 3.3.4 similar error message occur (g++ -o serialize serialize.cpp -lboost_serialization-gcc -I/usr/local/include/boost-1_32 ): "`.gnu.linkonce.t._ZNK5boost7archive17archive_exception4whatEv' referenced in section `.rodata' of /usr/local/lib/libboost_serialization-gcc.a(basic_iarchive.o): defined in discarded section `.gnu.linkonce.t._ZNK5boost7archive17archive_exception4whatEv' of /usr/local/lib/libboost_serialization-gcc.a(basic_iarchive.o) " Thank you for help! Christian _________________________________________________________________________ Mit der Grupppen-SMS von WEB.DE FreeMail können Sie eine SMS an alle Freunde gleichzeitig schicken: http://freemail.web.de/features/?mc=021179

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Errors Compiling exception
by Eyal Inbar 31 Mar '05

31 Mar '05

I'm trying to use dijkstra-example and i get /usr/local/include/boost/graph/dijkstra_shortest_paths.hpp:137: exception handling disabled, use -fexceptions to enable I'm not sure what version i have but i have the folder /i386-glibc21-linux if its help? eyal

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MPL Question on crossing the compile \ runtime barrier with bind | adding to boost profiler abstracted file access
by Brian Braatz 30 Mar '05

30 Mar '05

I have been reading (ahem and re-reading) "C++ Template Metaprogramming" I have a problem I am trying to solve and was up late last night looking for the answer to jump out at me. If nothing else this helps me as I tend to re-read the same chapters over and over. Here is what I am trying to do In working on coded I am adding to the proposed Boost Profiler (started by Chris Diggings, inherited by yours truly). I am using RAII all "over" my program in the extensions I am adding to the profiler. This puts me in a spot where I have MACROs which stuff the profile points in the program. Now the problem is I would like to be able to add a template param to the TYPE of the profile points which gives it the initialization code for the STREAM it is using. The problem is since the objects themselves get created ALL OVER the program, I don't have a single point of construction (because I am using RAII to track the life cycles inside the functions themselves). I.e. I want to be able to use Boost.IOstreams or ofstream or whatever for these objects.I just need to , at the TYPE DEFINITION be able to define how to initialize this passed stream. I need to be able to do something like this Template <typename STREAMTYPE, typename INITFUNCTOR> Class MyClass { Public: STREAMTYPE outstream; MyClass() { INITFUNCTOR f(outstream); // open the file, init iostreams , or whatever } }; I can always pass in a functor, but what I really want for Christmas is to be able to Tyepdef MyClass<std::ofstream, bind(&std::ofstream::open,_1,"MyFile.txt") > MyNewClass; This doesn't work because bind returns an actual OBJECT instead of a type. (intuitively - it would be cool if I could say bind(...)::Type which would give me the TYPE of the generated functor) SO that led me to be up until 3 am reading about mpl::lambda. I am still trying to determine if THAT can be used in place, but the dots are not connecting for me yet. Any suggestions or directions pointed GREATLY appreciated. Is there a way to make this work with MPL::Lambda? Thanks Brian

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RE: [Boost-users] Boost.lambda
by Brian Braatz 30 Mar '05

30 Mar '05

Ah Kindred spirits. I asked a similar question awhile ago (like last year). I am sorry I was not able to find the original message. The answer I was given was that the & is the correct syntax per the CPP standard. What you are doing is taking the address of a memberfunction. What was confusing to me was that some compilers allow you to LEAVE OFF the & while others don't. The ones that do are trying to be helpful but are not conformant. ________________________________ From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Sean DeNigris Sent: Tuesday, March 29, 2005 7:31 PM To: boost-users(a)lists.boost.org Subject: [Boost-users] Boost.lambda Can anyone explain why the class member functions need their address taken when used in a boost::lambda::bind inside the class? e.g. vector<int> v; MyClass theClass; for_each(v.begin(), v.end(), bind(MyClass::DoSomething, &theClass, _1)); //The above compiles fine, but... class MyClass { public: void DoSomething(const int& i) { ... } void Go() { for_each(myInts.begin(), myInts.end(), /*--------------------->*/ bind(MyClass::DoSomething, this, _1)); } vector<int> myInts; }; The above code does not compile. The marked line needs to be: bind(&MyClass::DoSomething, this, _1)); Why? Thanks. - Sean

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