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BOOST_FOREACH is not working under VC7.0
by Yaroslav Yanovsky 19 Jan '05

19 Jan '05

Hello boost-users, I know, BOOST_FOREACH is not distributed with boost, but I don't know where else should I write about it so I decided to post it here. BOOST_FOREACH is not compiling under VC 7.0 Here I've wrote small example that represents problem: ----------------------- #include <iostream> #include <list> #include <boost/foreach.hpp> using std::list; class BNamespace { public: list<int> contents; int Find(int what) const; }; inline int BNamespace::Find(int what) const { BOOST_FOREACH (int i, this->contents) //BOOST_FOREACH (const int& i, this->contents) // will fail too if (i==what) return i; return 0; } int main() { BNamespace lst; lst.contents.push_back(4); lst.contents.push_back(5); lst.contents.push_back(6); int i=lst.Find(6); std::cout<<i<<std::endl; return 0; } ----------------------- Compilation of this code on VC 7.0 leads to following errors: a.cpp(15) : error C2667: 'boost::for_each::wrap' : none of 2 overloads have a best conversion f:\Libs\boost\boost\foreach.hpp(138): could be 'boost::for_each::container<T,boost::mpl::true_> boost::for_ each::wrap(const T &)' f:\Libs\boost\boost\foreach.hpp(132): or 'boost::for_each::container<T,boost::mpl::false_> boost::for _each::wrap(T &)' while trying to match the argument list '(const std::list<_Ty,_Ax>)' with [ _Ty=int, _Ax=std::allocator<int> ] a.cpp(15) : error C2668: 'boost::for_each::wrap' : ambiguous call to overloaded function f:\Libs\boost\boost\foreach.hpp(138): could be 'boost::for_each::container<T,boost::mpl::true_> boost::for_ each::wrap(const T &)' f:\Libs\boost\boost\foreach.hpp(132): or 'boost::for_each::container<T,boost::mpl::false_> boost::for _each::wrap(T &)' while trying to match the argument list '(const std::list<_Ty,_Ax>)' with [ _Ty=int, _Ax=std::allocator<int> ] ----------------------- I've tried to compile same code with MinGW and it succeded. Can anyone help me with this problem? Thanks! -- Best regards, Yaroslav mailto:yaroslav@enkord.com

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Re: [Boost-users] Re: (de)serializing vector<const A*>
by Zoltan Szatmary 19 Jan '05

19 Jan '05

Dear Robert Thank you for answering. I am sorry I was not very specific (though please don't think I would put the question without RTFM first ;) ) The part of documentation you pointed to told me to do const_cast manually. It is fine in case of const members of a class, but this time the const type is contained by a vector. I could manually write the serialization code for my vector<const A*> type but I hoped I could use the built-in vector serialization templates in vector.hpp To be clear I copy here the piece of code I am talking about #include <fstream> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/serialization/vector.hpp> using namespace std; class A { friend class boost::serialization::access; template<class Archive> void serialize (Archive &ar, const unsigned int version) { } }; /* NEITHER OF THESE HELPS namespace boost { namespace serialization { template <class Archive> inline void serialize (Archive &ar, const A *p, const unsigned int version) { ar & const_cast<A*>(p); } template <class Archive> inline void serialize (Archive &ar, const A &p, const unsigned int version) { ar & const_cast<A&>(p); } }} */ int main() { A a; vector<const A*> v(1, &a); ofstream ofs ("vectorofconstptr"); boost::archive::text_oarchive oa(ofs); oa << v; ofs.close(); // UNTIL THIS POINT EVERYTHING IS FINE // BUT DESERIALIZATION FAILS TO COMPILE ifstream ifs("vectorofconstptr"); boost::archive::text_iarchive ia(ifs); vector<const A*> p; ia >> p; ifs.close(); } Please tell me if I am doing something wrong. I tried to look into the documentation, I have even followed the serialization library code for a while, but eventually decided to ask. Thank you in advance Zoltan >Look in the documentation under Reference/Class Serialization/const members >Robert Ramey >Zoltan Szatmary wrote: >> Hello >> >> could you help please? what is the easiest way to (de)serialize a >> member of type vector<const A*> (A being a base class)? Serializing >> is fine, but deserialization fails to compile since the vector >> deserialization code tries to deserialize a const A* pointer without >> const_cast-ing it (I guess). >> >> Thank you in advance >> >> Zoltan

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long + bigint
by Benjamin Schmeling 19 Jan '05

19 Jan '05

Hi, I am wrapping a class "bigint" from c++ to python. I have overloaded the add method to do something like this on python: >>>n=bigint(5); >>>n+5L 5 This works well, but if I try to do it vice versa my overloaded add method isn't called by python: >>>n=bigint(5); >>>5L+n Causes error. My add methods look like this: bigint add_bigint_l(bigint const& b, long_ const& l) bigint add_l_bigint(long_ const& l,bigint const& b) and are defined by .def("__add__", add_bigint_l) .def("__add__", add_l_bigint) Can someone tell me howto realize it? Benjamin Schmeling -- GMX im TV ... Die Gedanken sind frei ... Schon gesehen? Jetzt Spot online ansehen: http://www.gmx.net/de/go/tv-spot

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re: strange filesystem dll behaviour
by Paul 19 Jan '05

19 Jan '05

Bugger, I forgot to mention: I'm using boost 1.32 and GCC 3.4.2 on a Windows 2000 computer. Thanks Paul Find local movie times and trailers on Yahoo! Movies. http://au.movies.yahoo.com

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RE: [Boost-users] boost::bind and methods of managed classes
by Bjorn.Karlsson＠readsoft.com 19 Jan '05

19 Jan '05

Hello Vasco, > From: Vasco Lohrenscheit [mailto:valoh@krautgames.de] > > is there a easy way/workaround to use methods of managed classes with > boost::bind? It's not exactly easy, but I think it can be done. First of all, you won't be able to take the address of TestManagedClass::test because it's a managed class. Second, the calling conventions of invoking the signal (default: __stdcall) and the function test (__clrcall) are different. Here's a workaround that should work: * Create a nested __nogc class in the __gc class (technically, it doesn't need to be nested, just __nogc). * In the nested class, store a pointer (using gcroot<>, as it's a managed class) to the outer class. * In the constructor of the outer class, create an instance of the nested class. * Define a callback member in both classes. In the inner class, simply forward to the corresponding function in the outer class. * Create the bind expression using the address of the nested class' function. * Invoke the signal and keep your fingers crossed. Here's an example that demonstrates the technique: #include "boost/bind.hpp" #include "boost/signals.hpp" #include "vcclr.h" // For gcroot<> boost::signal<void (int)> sig; __gc class managed_class { public: managed_class() : inner_(new unmanaged_class(this)) { // Connect to the signal sig.connect(boost::bind(&managed_class::unmanaged_class::callback,inner_,_1) ); } void callback(int i) { // This is the managed "callback" } private: // Here's the nested class __nogc class unmanaged_class { public: unmanaged_class(managed_class* outer) : outer_(outer) {} void callback(int i) { outer_->callback(i); } private: gcroot<managed_class*> outer_; }; unmanaged_class* inner_; }; void main() { managed_class* p=new managed_class(); sig(42); // Invokes the signal, // which invokes the binder, // which invokes unmanaged_class::callback(), // which invokes managed_class::callback(). } Bjorn Karlsson

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[Boost-users] Compile on OSX hangs, huge memory usage, xml_grammar.o
by Stian Soiland 19 Jan '05

19 Jan '05

Tried to build boost_1_32_0 on OSX today, but the build process brought the machine to trashing, as cc1plus ended up using all available memory. The problem seems related to libs/serialization - removing it made the rest of boost build almost OK. Here are the details: Mac OS X 10.3.7, with gcc version 3.3 20030304 (Apple Computer, Inc. build 1666) Lots of programs from fink installed to /sw Lots of programs from opendarwin installed to /opt 1. port install boost-jam (3.1.10) 2. Downloaded boost_1_32_0.tar.bz2 from boost.org and unpacked 3. bjam -sTOOLS=darwin stage 4. Start top in another terminal 5. Wait some hours until your hard drive starts to make crazy noises 6. Last bjam output will be: darwin-C++-action bin/boost/libs/serialization/build/libboost_serialization.a/darwin/ release/xml_grammar.o Top will show something like: Processes: 88 total, 2 running, 1 stuck, 85 sleeping... 223 threads 17:46:32 Load Avg: 1.72, 1.89, 1.45 CPU usage: 9.5% user, 30.2% sys, 60.3% idle SharedLibs: num = 131, resident = 7.25M code, 404K data, 136K LinkEdit MemRegions: num = 28961, resident = 896M + 2.28M private, 16.7M shared PhysMem: 111M wired, 601M active, 300M inactive, 1013M used, 10.6M free VM: 7.65G + 88.6M 1116924(79) pageins, 1865004(459) pageouts PID COMMAND %CPU TIME #TH #PRTS #MREGS RPRVT RSHRD RSIZE VSIZE 28631 cc1plus 11.5% 1:51.55 1 12 16184 842M- 804K 543M- 1.09G+ 28630 g++-3.3 0.0% 0:00.03 1 11 18 0K 264K 76K 21.8M 28628 bjam 0.0% 0:07.44 1 12 52 4K 264K 92K 31.2M rm -rf libs/serialization to avoid problem. But I guess some people actually need those xml-grammars.. -- Stian Søiland You can't say civilization don't Trondheim, Norway advance, however, for in every war http://www.soiland.no/ they kill you in a new way. [Rogers] =/\=

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[stringalgo] Tokenizer with string delimiters?
by Stefan Slapeta 19 Jan '05

19 Jan '05

Hi, please could anybody tell if it's possible to use split() to tokenize a string where the token delimiters are strings of - n characters, e.g. "\r\n" - m..n characters, e.g. "\n" _or_ "\r\n" If not, are there alternatives? Thanks, Stefan

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Re: [Boost-users] Re: Re: gregoran::year_based_generator and=?ISO-8859-1?Q? mingw-3.4.2?=
by Antonio Coralles 19 Jan '05

19 Jan '05

boost-users(a)lists.boost.org wrote: > On Tue, 18 Jan 2005 17:19:56 -0700, Bart wrote > >> > i've also tried to compile some other examples - they work, like the >> > rest of my program; maybe there is something wrong with my > installation >> > - but i don't know what. it is also really strange that mingw accepts >> > partial_date [in my app] which is derived from year_based_generator > but >> > refuses to work with year_based_generator*. >> > >> > antonio >> >> I'm stumped. >> >> I tried upgrading to gcc/g++ 3.4 (I extracted these into my original >> mingw installation) and am unable to duplicate your errors. >> >> If you can spare the time, try downloading a fresh boost_1_32_0 archive >> and attempting a print_holidays compile with that source tree. I'm >> wondering if your source tree may have been corrupted somehow. > > That would be my guess at this point too. The fact that the example fails > means something is really off. I just compiled 1_32 with mingw dev-cpp > with > compiler version 3.3.1. The regression tests also succeed for your > combination. More than likely it would have to be something messed up in > boost/date_time/date_generators.hpp -- so you could try just getting the > latest version of that file and replacing it. > > > Jeff i'll try a complete reinstallation of the boost-libraries in the next few days. i think it is more likely that the library isn't correctly installed because i had the same problems with 1_31_0. it is eaven possible that there is something wrong with my mingw installation. antonio

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(de)serializing vector<const A*>
by Zoltan Szatmary 19 Jan '05

19 Jan '05

Hello could you help please? what is the easiest way to (de)serialize a member of type vector<const A*> (A being a base class)? Serializing is fine, but deserialization fails to compile since the vector deserialization code tries to deserialize a const A* pointer without const_cast-ing it (I guess). Thank you in advance Zoltan

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Re: [Boost-users] Re: gregoran::year_based_generator and mingw-3.4.2
by Antonio Coralles 19 Jan '05

19 Jan '05

[snip] > boost-users(a)lists.boost.org <mailto:boost-users@lists.boost.org> wrote: >> "Antonio Coralles" <noche.suapie(a)reflex.at > <mailto:noche.suapie@reflex.at> <mailto:>> wrote in message >> news:41EBE2F0.7020003@reflex.at... >>> i'm writing on a programm which uses the boost date_time library >>> [boost-version = 1.32.0] heavily; while i normally programm in linux >> using >>> gcc-3.3.5 i also need to compile my program in windows from time to >> time. >>> because it makes life easier with another library [gtkmm-2.4.8] i'm >> using >>> mingw-3.4.2; everthing worked fine (my code contains about 10 000 lines >>> using boost_date_time) until i started using a >>> boost::gregorian::year_based_generator. while gcc-3.3.5 in liux >> accepts my >>> code without even a single warning [with -Wall], mingw-3.4.2 complains - >>> it seems that the compiler has problems with year_based_generator: > [snip] [snip] >> Are you able to build the print_holidays example? It uses pointers to >> year_base_generators. [snip] > > i'll try that in the next time and post the results of this experiment; > be the way, i've now compiled my app in win succesfully by putting > evrything which is somehow connected to year_based_generator into > #ifndef WIN32_COMPILE .... #endif. that isn't too bad for the moment, > because i don't use these methods by now in > other parts of my prog [except unit tests]. but sooner or later i will ... > [snip] i've now tried to compile the print_holidays example: this is what i got: $ g++ -lboost_date_time-mgw-1_32 print_holidays.cpp -o test.exe print_holidays.cpp: In function `int main()': print_holidays.cpp:43: error: `year_based_generator' undeclared (first use this function) print_holidays.cpp:43: error: (Each undeclared identifier is reported only once for each function it appears in.) print_holidays.cpp:43: error: template argument 1 is invalid print_holidays.cpp:43: error: template argument 2 is invalid print_holidays.cpp:43: error: invalid type in declaration before ';' token print_holidays.cpp:44: error: `push_back' has not been declared print_holidays.cpp:44: error: request for member of non-aggregate type before '( ' token print_holidays.cpp:45: error: `push_back' has not been declared print_holidays.cpp:45: error: request for member of non-aggregate type before '( ' token print_holidays.cpp:46: error: `push_back' has not been declared print_holidays.cpp:46: error: request for member of non-aggregate type before '( ' token print_holidays.cpp:53: error: `push_back' has not been declared print_holidays.cpp:53: error: request for member of non-aggregate type before '( ' token print_holidays.cpp:55: error: `push_back' has not been declared print_holidays.cpp:55: error: request for member of non-aggregate type before '( ' token print_holidays.cpp:57: error: `push_back' has not been declared print_holidays.cpp:57: error: request for member of non-aggregate type before '( ' token print_holidays.cpp:59: error: `push_back' has not been declared print_holidays.cpp:59: error: request for member of non-aggregate type before '( ' token print_holidays.cpp:64: error: template argument 1 is invalid print_holidays.cpp:64: error: template argument 2 is invalid print_holidays.cpp:64: error: expected `;' before '::' token print_holidays.cpp:65: error: `it' undeclared (first use this function) print_holidays.cpp:65: error: `end' has not been declared print_holidays.cpp:65: error: request for member of non-aggregate type before '( ' token ' token i've also tried to compile some other examples - they work, like the rest of my program; maybe there is something wrong with my installation - but i don't know what. it is also really strange that mingw accepts partial_date [in my app] which is derived from year_based_generator but refuses to work with year_based_generator*. antonio

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mpl::sequence question
by Martin Pasdzierny 19 Jan '05

19 Jan '05

Hello meta programmers, I am looking for a way to extract a sub sequence of a given type list by identifying the begin/end of the sub sequence by the corresponding iterators <code> #include <boost/mpl/vector.hpp> #include <boost/mpl/for_each.hpp> #include <boost/mpl/less.hpp> #include <boost/mpl/greater.hpp> #include <boost/mpl/and.hpp> #include <boost/mpl/find.hpp> #include <boost/mpl/lambda_fwd.hpp> #include <boost/mpl/lambda.hpp> #include <boost/mpl/placeholders.hpp> #include <boost/mpl/if.hpp> #include <boost/mpl/copy.hpp> #include <boost/mpl/copy_if.hpp> #include <boost/mpl/remove_if.hpp> #include <boost/mpl/back_inserter.hpp> #include <boost/mpl/transform.hpp> #include <boost/mpl/push_back.hpp> #include <boost/mpl/int.hpp> // these namespace clauses are motivated from "C++ Template Metaprogramming" by D.Abrahams,A.Gurtovoy: namespace mpl = boost::mpl ; using mpl::placeholders; // But why do I still need to type 'mpl::_1' instead of plain '_1' ? // here is my type list typedef mpl::vector<int,double,std::string > my_types; // from_pos and to_pos are start and end iterators of the subsequence typedef typename mpl::find<my_types,int>::type from_pos; typedef typename mpl::find<my_types,std::string>::type to_pos; // all elements (types) of my_types should be copied into the new seuqence my_sub_types if their iterator (index) is inside the given interval (from_pos,to_pos) typedef mpl::copy_if<my_types, mpl::and_< mpl::greater< mpl::find<my_types,mpl::_1>::type, mpl::int_<from_pos> > , mpl::less< mpl::find<my_types,mpl::_1>::type, mpl::int_<to_pos> > >, mpl::back_inserter< mpl::vector<> > >::type my_sub_types; </code> This code (and lots of slight variations) does not compile. Why ? Any hint (conceptual,syntactical,etc.) is welcome ! regards,Martin. <martin(a)pasdzierny.de>

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Re: [Boost-users] Re: gregoran::year_based_generator and mingw-3.4.2
by Antonio Coralles 18 Jan '05

18 Jan '05

boost-users(a)lists.boost.org wrote: > > "Antonio Coralles" <noche.suapie(a)reflex.at <mailto:>> wrote in message > news:41EBE2F0.7020003@reflex.at... >> i'm writing on a programm which uses the boost date_time library >> [boost-version = 1.32.0] heavily; while i normally programm in linux > using >> gcc-3.3.5 i also need to compile my program in windows from time to > time. >> because it makes life easier with another library [gtkmm-2.4.8] i'm > using >> mingw-3.4.2; everthing worked fine (my code contains about 10 000 lines >> using boost_date_time) until i started using a >> boost::gregorian::year_based_generator. while gcc-3.3.5 in liux > accepts my >> code without even a single warning [with -Wall], mingw-3.4.2 complains - >> it seems that the compiler has problems with year_based_generator: >> >> calendar.hpp:60: error: variable or field `insertGenerator' declared void >> calendar.hpp:60: error: expected `;' before '(' token >> calendar.hpp:92: error: expected `)' before '*' token >> calendar.hpp:95: error: using-declaration for non-member at class scope >> calendar.hpp:95: error: expected `;' before '*' token >> >> here is the header: >> > ...snip... >> maybe somebody can give me a hint - or maybe point out an error in this >> header which is ignored by gcc-3.3.5. >> thanks, >> antonio > > I don't have mingw 3.4 available to me (I have 3.2). I do know the > regressions tests are passing for date_generators and 3.4 though. > > Are you able to build the print_holidays example? It uses pointers to > year_base_generators. > > It's in libs/date_time/example/gregorian. > > Bart > i'll try that in the next time and post the results of this experiment; be the way, i've now compiled my app in win succesfully by putting evrything which is somehow connected to year_based_generator into #ifndef WIN32_COMPILE .... #endif. that isn't too bad for the moment, because i don't use these methods by now in other parts of my prog [except unit tests]. but sooner or later i will ... antonio

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boost::tokenizer problems with Sun CC 5.3
by Debajit Adhikary 18 Jan '05

18 Jan '05

For the following code: // start of code #include <iostream> #include <string> #include <boost/tokenizer.hpp> int main() { using namespace std; using namespace boost; string s = "first second third"; tokenizer<> tok(s); for(tokenizer<>::iterator i = tok.begin(); i != tok.end(); ++i) cout << *i << "\n"; } // end of code With the Sun CC compiler (Sun WorkShop 6 update 2 C++ 5.3), I get the following error message: "/usr/include/boost/iterator/iterator_facade.hpp", line 623: Error: Could not find a match for boost::iterator_core_access::equal<boost::iterator_core_access::Facade1, boost::iterator_core_access::Facade2>(const boost::token_iterator<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, const boost::token_iterator<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, boost::is_convertible<boost::token_iterator<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, boost::token_iterator<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>>). "t.cpp", line 15: Where: While instantiating "boost::operator!=<boost::token_iterator<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, std::basic_string<char, std::char_traits<char>, std::allocator<char>>, boost::forward_traversal_tag, const std::basic_string<char, std::char_traits<char>, std::allocator<char>>&, int, boost::token_iterator<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, std::basic_string<char, std::char_traits<char>, std::allocator<char>>, boost::forward_traversal_tag, const std::basic_string<char, std::char_traits<char>, std::allocator<char>>&, int>(const boost::iterator_facade<boost::token_iterator<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, std::basic_string<char, std::char_traits<char>, std::allocator<char>>, boost::forward_traversal_tag, const std::basic_string<char, std::char_traits<char>, std::allocator<char>>&, int>&, const boost::iterator_facade<boost::token_iterator<boost::char_delimiters_separator<char, std::char_traits<char>>, const char*, std::basic_string<char, std::char_traits<char>, std::allocator<char>>>, std::basic_string<char, std::char_traits<char>, std::allocator<char>>, boost::forward_traversal_tag, const std::basic_string<char, std::char_traits<char>, std::allocator<char>>&, int>&)". "t.cpp", line 15: Where: Instantiated from non-template code. 1 Error(s) detected. What could be the problem here? If Sun CC 5.3 doesnt support boost::tokenizer at all, are there any workarounds that I could use?

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gregoran::year_based_generator and mingw-3.4.2
by Antonio Coralles 18 Jan '05

18 Jan '05

i'm writing on a programm which uses the boost date_time library [boost-version = 1.32.0] heavily; while i normally programm in linux using gcc-3.3.5 i also need to compile my program in windows from time to time. because it makes life easier with another library [gtkmm-2.4.8] i'm using mingw-3.4.2; everthing worked fine (my code contains about 10 000 lines using boost_date_time) until i started using a boost::gregorian::year_based_generator. while gcc-3.3.5 in liux accepts my code without even a single warning [with -Wall], mingw-3.4.2 complains - it seems that the compiler has problems with year_based_generator: calendar.hpp:60: error: variable or field `insertGenerator' declared void calendar.hpp:60: error: expected `;' before '(' token calendar.hpp:92: error: expected `)' before '*' token calendar.hpp:95: error: using-declaration for non-member at class scope calendar.hpp:95: error: expected `;' before '*' token here is the header: /* This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifndef CL_CALENDAR #define CL_CALENDAR #include "boost/date_time/gregorian/gregorian.hpp" #include <stdexcept> #include <vector> #include <map> #ifndef BG #define BG boost::gregorian #endif /*!@brief besides of providing you with information if the day you are looking at is a * working day / saturday / sunday you can also store and retrieve additional * information about specific dates */ class calendar { public: enum dayChar { NORMAL_DAY = 0, SATURDAY = 1, SUNDAY = 2, PUBLIC_HOLIDAY = 3, SPECIAL_DAY = 4 }; /*!@brief obtain a calendar for a given context*/ static calendar& get(unsigned context=0); /*!@brief remove all calendar instances which have been created so far*/ static void removeAll(); /*!@brief remove the instance for a given context * * @remark you should call this function if you don't need the instance associated with * with context any more to avoid memory leaks ! */ static void remove(unsigned context); /*!@param[in] tDay the day to mark * @param[in] character the new character * @return true if the operation was succesfull * @note you cant lower the default character of a given day - e.g. you can't * give a sunday the character of a normal working day*/ bool markDay(const BG::date& tDay, dayChar character); /*!@return true if succesfull*/ bool unmarkDay(const BG::date& tDay); /*!@brief mark a day for every year using a partial_date * * @param[in] pDate a partial date * @param[in] character the new character*/ void markDay(const BG::partial_date& pDate, dayChar character); /*!@return true if succesfull*/ bool unmarkDay(const BG::partial_date& tDate); /*!@brief use this function to define more sophisticated (holi)days * * @param[in] gen a pointer to a year_based_generator optained from new * @param[in] manage if true the calendar is responsible for deleting*/ void insertGenerator(BG::year_based_generator *gen, dayChar character, bool manage=true); /*!@brief removes all generators inserted with insertGenerator*/ void removeGenerators(); /*!@brief get information from our calendar*/ dayChar getDayCharacter(const BG::date& thatDay) const; void reset(); int getRegularWorkingDaysWithin(const BG::date_period& tPeriod) const; /*!@remark this function can be usefull to dump our calendar to a file */ const std::map<BG::date, dayChar>& getDateMap() const { return _dMap; } /*!@remark this function can be usefull to dump our calendar to a file */ const std::map<BG::partial_date, dayChar>& getPartialDateMap() const { return _pMap; } private: calendar() {}; ~calendar(); //no copy-construction, no assignement calendar(const calendar&); calendar& operator=(const calendar&); static dayChar getDefaultCharacter(const BG::date& tDate); //data std::map<BG::date, dayChar> _dMap; std::map<BG::partial_date, dayChar> _pMap; struct hlp { hlp(BG::year_based_generator *gen, dayChar tChar, bool man) : generator(gen), character(tChar), manage(man) {} BG::year_based_generator *generator; dayChar character; bool manage; }; std::vector<hlp> _genVec; static std::map<unsigned, calendar*> _sc_calMap; }; std::ostream& operator<<(std::ostream& os, calendar::dayChar dChar); std::istream& operator>>(std::istream& is, calendar::dayChar& dChar); #endif maybe somebody can give me a hint - or maybe point out an error in this header which is ignored by gcc-3.3.5. thanks, antonio

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spirit (boost 1.32.0) grammar.ipp won't compile
by Sergey Skorniakov 18 Jan '05

18 Jan '05

Hello, All! I had tryed to compile some code with Microsoft (R) C/C++ Optimizing Compiler Version 14.00.2207 for AMD64 (from Server 2003 DDK) and got an error: C:\boost_1_32_0\boost\spirit\core\non_terminal\impl\grammar.ipp(308) : error C2784: 'std::mem_fun_t<_R,_Ty> std::mem_fun(_R (__cdecl _Ty::* ) (void))' : could not deduce template argument for 'T1 (__cdecl T2::* )(void)' from 'int (__cdecl boost::spirit::impl::grammar_helper_base<GrammarT>::* )(GrammarT *)' with [ GrammarT=boost::spirit::grammar<boost::archive::basic_xml_grammar<wchar_t>>::self_t ] Just changing std::mem_fun(&helper_base_t::undefine) to std::mem_fun1(&helper_base_t::undefine) resolves this problem. Modified successfully compiles under VC7.1, too. With best regards, Sergey.

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Have anyone used boost on ARM platform?
by Vyacheslav E. Andrejev 17 Jan '05

17 Jan '05

Hello All. I'm interested in possibility of using boost library on ARM9 platform. Does anyone do it before? Any pitfalls and hidden dangers? What toolchain for compilation is better to use? Is there some performance drawbacks when using boost compared with pure C? -- Vyacheslav E. Andrejev System Architect, Excelsior, LLC

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counting_iterator and iterator_adaptor problem
by Felipe Magno de Almeida 17 Jan '05

17 Jan '05

I'm trying to create an iterator from a class that is almost an iterator, it worked fine for const iterator with counting_iterator, but when I needed to dereference it, it complained about this: error C2440: 'return' : cannot convert from 'const xmlmanager::xml_basic_node<T>' to 'boost::iterator_facade<Derived,Value,CategoryOrTraversal,Reference,Difference>::reference' I think it is because it is still a const iterator... But I need a mutable iterator, and I have no clue in how to do it... I've tried the documentation, but it just explains what it is, but not ho to do it. The way I'm doing the iterator is: template <typename T> class xml_basic_node : public xml_basic_container<T>, public boost::iterator<boost::iterator_archetypes::readable_lvalue_iterator_t, xml_basic_node<T> > { public: // some specifics constructors bool operator == (xml_basic_node<T> const &n) const { // compares equality } xml_basic_node<T> &operator ++() { // advances... return *this; } }; and the iterator through counting_iterator: template <typename T> class acontainer { typedef boost::counting_iterator<xml_basic_node<T> > iterator; }; If someone could, please point me where I am getting wrong... I am days already trying to figure out how to do it... Sorry for the size of the mail and thanks in advance. -- Felipe Magno de Almeida UIN: 2113442 email: felipe.almeida@ic unicamp br, felipe.m.almeida@gmail com I am a C, modern C++, MFC, ODBC, Windows Services, MAPI developer from synergy, and Computer Science student from State University of Campinas(UNICAMP). To know more about: Unicamp: http://www.ic.unicamp.br Synergy: http://www.synergy.com.br current work: http://www.mintercept.com

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Environment variable library?
by Aaron W. LaFramboise 17 Jan '05

17 Jan '05

Is there a Boost library that supports manipulating process environment variables? I realize that accessing environment variables in the normal way is typically trivial, but it would be nice to have the entire thing wrapped up in a system-independent interface that is natural for C++. Aaron W. LaFramboise

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shared_from_this and custom deleters
by Niklas Wiberg 17 Jan '05

17 Jan '05

Hi, I have the following situation: In the constructor body of class A, I need to call functions that take a shared_ptr<A> as a parameter. These functions do not store the shared_ptr<A>, but in some situations a weak_ptr<A>. There is not yet any shared_ptr owning the A instance, since this is during A construction... At first, I thought using a shared_ptr<A> tmpThis(this, NullDeleter()) was a good idea. But when I later on (when another shared_ptr actually owns the A instance) want to use shared_from_this on A, I get an exception since the use_count of the internal weak_ptr is based on the first temporary shared_ptr that I used during construction (with the NullDeleter). Am I correct in my assumption that the internal weak_ptr in enable_shared_from_this is initialized by the first shared_ptr and that will prevent any later use of shared_from_this when I have another shared_ptr (with a default deleter) owning the element? I guess that a static create function would solve the problem, but changing that would be quite a big undertaking in this particular case so I thought I'd check if someone knows a simple solution to this... I added a small example code snipped below... Best regards, Niklas Example: void foo(shared_ptr<A> a); void otherFunction(shared_ptr<A> a); class A : public enable_shared_from_this<A> { A() { // Can't use shared_from_this since no shared_ptr owns this yet shared_ptr<A> thisTmp(this, NullDeleter()); foo(thisTmp); } bar() { otherFunction(shared_from_this()); // Throws exception... } }; int main() { shared_ptr<A> a(new A()); a->otherFunction(); ... }

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How to pass a member variable with boost::ref() in boost::bind()?
by tom gee 17 Jan '05

17 Jan '05

Here is the work around: class A { ... private: typedef struct _ONE_RECORD_ { string sGUID; string sID; string sName; string sSupport; string sModify; } ONE_RECORD; vector<ONE_RECORD> m_v; private: void FillOneLine(const ONE_RECORD& one_line); void FillAllLines(); }; void A::FillAllLines() { ... // method 1 for_each(m_v.begin(), m_v.end(), boost::bind(&A::FillOneLine, this,_1)); // OK // method 2 for_each(m_v.begin(), m_v.end(), boost::bind(&A::FillOneLine, this, ref(_1))); // error ... } Since ONE_RECORD can be large, I prefer to calling bind() as method 2, but, compiled under VC7.1 it generates such an error: e:\Boost\include\boost-1_32\boost\bind.hpp(285): error C2664: 'R boost::_mfi::mf1<R,T,A1>::operator ()<A>(U & ,A1) const' : cannot convert parameter 2 from 'boost::arg<I>' to 'A::ONE_RECORD' with [ R=void, T=A, A1=A::ONE_RECORD, U=A * ] and [ I=1 ] Can any body help to explain why and give a solution? Thanks.

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Smart pointers
by Kercso Jozsef 17 Jan '05

17 Jan '05

Hi! I would have several questions regarding to smart pointers. They are completely new for me, and I'm not sure if my design is the best. Feel free to comment it. :) The "safe" pointer problem: There is a class Data, whom instances are used by many other Processor objects. It can happen, that a Manager object deletes the Data object, so the Processors have invalid pointers. It must be made such a design, where the Processors can check the Data pointers before using it, if it is still valid or not. My solution: class Handler; class Data { boost::shared_ptr< Data > m_sharedPtr; //shared pointer to myself public: Data(); ~Data() {}; Handler getHandler(); int aMethod(); .... }; class Handler { boost::weak_ptr< CTrain > m_weakPtr; //weak pointer to the handled Data public: Handler(boost::shared_ptr< Data > data) bool aMethod(int& result); ... }; Data::Data() : m_sharedPtr(this) {} Data::~Data() {} Handler Data::getHandler() { return Handler(m_sharedPtr); } int Data::aMethod() { return 1; } Handler::Handler(boost::shared_ptr< Data > data) : m_weakPtr(train) {} bool Handler::aMethod(int& result) { bool retVal = !m_weakPtr.expired(); if (retVal) { boost::shared_ptr< Data > p = m_weakPtr.lock(); result = p->aMethod(); } return retVal; } When somebody wants to access a Data object, it gets only a Handler to it. The Handler can check with its weak pointer, if the corresponding shared pointer is expired (data object deleted) or not. Thus it can be assured, that no invalid pointer of the Data object will be used by the Processors. If the Manager object (who has a container of Data* ) deletes a data object, the corresponding Handler gives false back, because m_weakPtr.expired() returns false. So everything seems to be OK, but there are several problems and questions: 1. the destructor of the Data object will be called twice, when the Manager calls 'delete data;': - Once, when by the delete. - Once by the m_sharedPtr. After this the use_count() method returns -1 (!!!) and the m_weakPtr.expired() returns true (!!!). To eliminate this problem I initialize the m_sharedPtr in the Data constructor in the following way: m_sharedPtr(this, emptyDeleter), where emptyDeleter is an empty method: void emptyDeleter(Data* data) { } 2. What happens, if one of the Processors locks its m_weakPtr to obtain a shared pointer to acces the Data, but after obtaining the shared pointer the manager deletes the corresponding data object? If the Processor tries to acces again the (deleted) data object --> core dump. I have found the following solution to this problem: - before deletion the Manager somehow checks if data->m_sharedPtr.unique() returns true. If not, it refuses to delete the data object. 3. The Data object will be accessed many times by many Processors, and by every access the following construction will be used: if (!m_weakPtr.expired()) { boost::shared_ptr< Data > p = m_weakPtr.lock(); // do job on p ... } My question is: how "expensive" is such a construction? How fast is to obtain a shared pointer from a weak pointer unsing lock()? If you already met the problem of these "safe" pointers and have an other solution, please share it with us. Or if you have a comment to my solution, then say it too. :) Thanks, Jozsef Kercso

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Boost with mingw creates .lib not .a
by John Arbash Meinel 17 Jan '05

17 Jan '05

I was wondering if there is a specific reason still that when using mingw to build the boost libraries it defaults to using the .lib extension? I was only able to find the following post: http://article.gmane.org/gmane.comp.lib.boost.devel/79594 Which is where David Abrahams states that file extensions are based on platform and not based on toolset. I've been using mingw lately, and at least current versions are able to find a library with a .lib extension without any problem. However, visual studio can not use that file as a library, and mingw will look for a .a first. What I'm thinking is that at least for the undecorated versions of the libraries (boost_python.lib) it should use the common convention for the compiler, that way you could have both in the same directory, and have the compiler pick the right one. I realize I can force this with a '-sSUFLIB=.a', I was just wondering if there was a reason the extension is based on platform, and not on TOOLS. John =:->

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boost::filesystem::path question
by matthew.j.polder＠itt.com 16 Jan '05

16 Jan '05

Hi, I typically work on Windows and Unix. Our network has a bunch of shared drives that I can access from both Windows and Unix by using the form: //filesystem/some/path/ It looks like boost::filesystem is getting rid of the double slash at the beginning and replacing it with a single slash. This will work on Unix but WIndows needs the double slashes. Any way around this? thanks, matthew ************************************ This e-mail and any files transmitted with it are proprietary and intended solely for the use of the individual or entity to whom they are addressed. If you have received this e-mail in error please notify the sender. Please note that any views or opinions presented in this e-mail are solely those of the author and do not necessarily represent those of ITT Industries, Inc. The recipient should check this e-mail and any attachments for the presence of viruses. ITT Industries accepts no liability for any damage caused by any virus transmitted by this e-mail. ************************************

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boost 1.32 with gcc 3.3 for darwin
by Becky Bendick 15 Jan '05

15 Jan '05

To anyone who is interested: With the assistance of a huge number of very useful people, I've sorted out how to successfully install the boost 1.32 package on Mac Darwin with gcc 3.3. There are two problems to solve: 1. some libraries are made but not usable because of errors like: /sw/include/boost/numeric/ublas/vector_expression.hpp:1837: error: due > to a defect in the G++ 3.2 ABI, G++ has assigned the same mangled > name to > twodifferent types In file included from > /sw/include/boost/numeric/ublas/matrix.hpp:23, > from conftest.cc:100: > /sw/include/boost/numeric/ublas/matrix_expression.hpp:5156: error: > due to a > defect in the G++ 3.2 ABI, G++ has assigned the same mangled name > to two > different types > configure:23533: $? = 1 > configure: failed program was: > | /* confdefs.h. */ The solution is to put -fabi-version=0 into your CFLAGS and CXXFLAGS, rebuild bjam, and install boost with the rebuilt bjam. 2. Install hangs on xml_grammar. The solution is outlined in http://lists.boost.org/MailArchives/boost/msg76758.php Or include the following: <darwin><release><inline>off Thanks to everyone who helped out. ------------------------------------------------------------------------ ---------------------- Rebecca Bendick, Ph.D. Bullard Laboratories University of Cambridge Madingley Road CAMBRIDGE CB3 0EZ United Kingdom bendick(a)esc.cam.ac.uk

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boost1.32
by Becky Bendick 14 Jan '05

14 Jan '05

I need the boost libraries in order to compile a new application. I installed the boost1.31 package from the fink release, using fink install boost 1.31 without any trouble, but when I then tried to configure the dependent application, it found that the boost/numeric/ublas/matrix.hpp library was unusable. On the advice of the boost-users list, I then installed boost 1.32, using the prebuilt executable for Darwin available on the boost web site. The install hung several times creating the serialization libraries, so I installed using the tag --without-serialization, and completed the install successfully that way. However, I still get an error when I configure the dependent package, saying that the matrix.hpp library is unusable. The config.log says: checking for boost/numeric/ublas/matrix.hpp usability... configure:22782: g++ -c -I/sw/include -O2 -ansi -Wall -Wno-unused -I/sw/include -I/usr/local/include /boost-1_32 conftest.cc >&5 In file included from /usr/local/include/boost-1_32/boost/numeric/ublas/traits.hpp:27, from /usr/local/include/boost-1_32/boost/numeric/ublas/storage.hpp:29, from /usr/local/include/boost-1_32/boost/numeric/ublas/matrix.hpp:21, from configure:22826: /usr/local/include/boost-1_32/boost/numeric/ublas/ returntype_deduction.hpp:53: warning: use of `long double' type; its size may change in a future release /usr/local/include/boost-1_32/boost/numeric/ublas/ returntype_deduction.hpp:53: warning: (Long double usage is reported only once for each file. /usr/local/include/boost-1_32/boost/numeric/ublas/ returntype_deduction.hpp:53: warning: To disable this warning, use -Wno-long-double.) In file included from /usr/local/include/boost-1_32/boost/numeric/ublas/vector.hpp:24, from /usr/local/include/boost-1_32/boost/numeric/ublas/matrix.hpp:22, from configure:22826: /usr/local/include/boost-1_32/boost/numeric/ublas/ vector_expression.hpp:1924: error: due to a defect in the G++ 3.2 ABI, G++ has assigned the same mangled name to two different types In file included from /usr/local/include/boost-1_32/boost/numeric/ublas/matrix.hpp:23, from configure:22826: /usr/local/include/boost-1_32/boost/numeric/ublas/ matrix_expression.hpp:5201: error: due to a defect in the G++ 3.2 ABI, G++ has assigned the same mangled name to two different types configure:22785: $? = 1 configure: failed program was: | #line 22760 "configure" | /* confdefs.h. */ Higher in the config.log is another error (unrelated?) that doesn't seem to cause any trouble: gcc -E -I/sw/include conftest.c configure:15096:28: ac_nonexistent.h: No such file or directory configure:15085: $? = 1 configure: failed program was: | #line 15070 "configure" | /* confdefs.h. */ Here's the info on my gcc. What is wrong with it ? And how can I fix it? gcc -v </dev/null >&5 Reading specs from /usr/libexec/gcc/darwin/ppc/3.3/specs Thread model: posix gcc version 3.3 20030304 (Apple Computer, Inc. build 1671) Thanks! Becky ------------------------------------------------------------------------ ---------------------- Rebecca Bendick, Ph.D. Bullard Laboratories University of Cambridge Madingley Road CAMBRIDGE CB3 0EZ United Kingdom bendick(a)esc.cam.ac.uk

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