September 2008 - Boost-users

boost::regex problem
by Silvio Reis Junior 03 Sep '08

03 Sep '08

Hello folks! I'm trying to work with boost::regex but I'm stuck. I wrote the following code: //------------------------------------------------------------------- int main( int argc, CHAR* argv[] ) { boost::regex RegEx( "(eth\\d)" ); if ( boost::regex_match( "dsjkadhjksadjks eth1: ssgdsdhjasgdjg", RegEx ) ) { printf( "Found.\n" ); } return 0; } I tested the expression with Expresso and it's correct although it doesn't work in the code above. Is there something missing? My best regards Silvio

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[boost.asio] string iterator not dereferencable using message in async_send_to
by John Urberg 03 Sep '08

03 Sep '08

I'm using async_send_to to send multicast messages. When I try to send data in a std::string, I always get a 'string iterator not dereferencable' assertion failure. I'm using boost 1.35 and VC9. Here's the code: // instance variable string buffer; // code in method buffer = BuildHailMessage(); socket.async_send_to( boost::asio::buffer(buffer), endpoint, boost::bind( &MulticastServer::HandleSendTo, this, boost::asio::placeholders::error)); I've also tried using char* buffer, dynamically allocating it based on the message length and then use std::copy to copy the std::string into the buffer, but I get heap corruption assertions when trying to delete [] it. The only way I've gotten this to work is using a fixed char[] buffer. Is there a way I can use a std::string with async_send_to? Do I need to use a different type of asio::buffer class? Thanks, John

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Function pointers vs boost.function
by Kurt Kohler 03 Sep '08

03 Sep '08

I have some code that uses pointers to member functions (not boost.function). It compiles and works fine. But when I tried to convert the code to use boost.function, I got a mess of errors. I know I'm doing something wrong, but I have no idea what it is. A clue would be greatly appreciated. Here's a reduced test case. #include <boost/function.hpp> struct X { double f(double x) { return x; } double g(double x) { return -x; } //typedef boost::function<double (double)> ftype; typedef double (X::*ftype)(double); double call(ftype func, double x) { //return func(x); return (this->*func)(x); } }; int main(int argc, char *argv[]) { X x; x.call(&X::f, 1.0); // Error occurs here x.call(&X::g, 2.0); } It compiles as it appears above, but if I switch the typedef and return statements to their commented versions, I get the following errors: if g++ -DHAVE_CONFIG_H -I. -I/home/kohler/Projects/test/trunk/src -I.. -O0 -Wall -g3 -MT test.0 -MD -MP -MF ".deps/test.Tpo" -c -o test.o /home/kohler/Projects/test/trunk/src/test.cpp; then mv -f ".deps/test.Tpo" ".deps/test.Po"; else rm -f ".deps/test.Tpo"; exit 1; fi /usr/include/boost/function/function_template.hpp: In static member function 'static R boost::detail::function::function_obj_invoker1<FunctionObj, R, T0>::invoke(boost::detail::function::function_buffer&, T0) [with FunctionObj = boost::_mfi::mf1<double, X, double>, R = double, T0 = double]': /usr/include/boost/function/function_template.hpp:368: instantiated from 'void boost::detail::function::basic_vtable1<R, T0, Allocator>::init(FunctionObj, boost::detail::function::function_obj_tag) [with FunctionObj = boost::_mfi::mf1<double, X, double>, R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:298: instantiated from 'void boost::detail::function::basic_vtable1<R, T0, Allocator>::init(F) [with F = boost::_mfi::mf1<double, X, double>, R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:339: instantiated from 'void boost::detail::function::basic_vtable1<R, T0, Allocator>::init(MemberPtr, boost::detail::function::member_ptr_tag) [with MemberPtr = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:298: instantiated from 'void boost::detail::function::basic_vtable1<R, T0, Allocator>::init(F) [with F = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:277: instantiated from 'boost::detail::function::basic_vtable1<R, T0, Allocator>::basic_vtable1(F) [with F = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:655: instantiated from 'void boost::function1<R, T0, Allocator>::assign_to(Functor) [with Functor = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:513: instantiated from 'boost::function1<R, T0, Allocator>::function1(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type) [with Functor = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /usr/include/boost/function/function_template.hpp:753: instantiated from 'boost::function<R ()(T0), Allocator>::function(Functor, typename boost::enable_if_c<boost::type_traits::ice_not<boost::is_integral<Functor>::value>::value, int>::type) [with Functor = double (X::*)(double), R = double, T0 = double, Allocator = std::allocator<void>]' /home/kohler/Projects/test/trunk/src/test.cpp:21: instantiated from here /usr/include/boost/function/function_template.hpp:134: error: no match for call to '(boost::_mfi::mf1<double, X, double>) (double&)' /usr/include/boost/bind/mem_fn_template.hpp:160: note: candidates are: R boost::_mfi::mf1<R, T, A1>::operator()(T*, A1) const [with R = double, T = X, A1 = double] /usr/include/boost/bind/mem_fn_template.hpp:179: note: R boost::_mfi::mf1<R, T, A1>::operator()(T&, A1) const [with R = double, T = X, A1 = double] g++ -v Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --enable-targets=all --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu Thread model: posix gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)

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transform_view: question about boilerplate code
by Zeljko Vrba 02 Sep '08

02 Sep '08

I have succeeded in writing the following transform functor: typedef bf::map<bf::pair<net, unsigned>, bf::pair<pin, unsigned> > Map; typedef bf::vector<unsigned, unsigned> Pair; struct Map2Pair { template<typename Sig> struct result; template<typename U> struct result<Map2Pair(U)> : remove_reference<T::second_type> { }; template<typename T> typename T::second_type operator()(T t) const { return t.second; } }; I have tested it, it works. The result magic has been copied from the transform_view example in the documentation and adjusted for the proper return type. Where can I read a bit more about result conventions? In particular, how does the template<typename U> struct result<Map2Pair(U)> : remove_reference<T::second_type> { }; specialization work when Map2Pair is a struct, and it doesn't even have a constructor! Even worse, why does it work at all when T is not in the scope of the template (.. because it's never used?) Yes, it is not used, the following functor also works: struct Map2Pair { template<typename T> typename T::second_type operator()(T t) const { return t.second; } }; When and how is the above version preferred than the simpler version?

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[Boost.Asio] service_name/port inconsistency
by Vjekoslav Brajkovic 02 Sep '08

02 Sep '08

Hi. When designing server-client model, one has to use boost::asio::ip::tcp::endpoint and boost::asio::ip::tcp::resolver::query respectively. What I am confused about is that query accepts std::string& service as a parameter whereas endpoint only accepts unsigned short. When writing code, it is really easy to get confused which constructor takes string and which short. I would appreciate is somebody could tell me if there is a way to create a server side component using integer as a service. - V

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[Math] errno on WCE
by Paul Heil 02 Sep '08

02 Sep '08

I'm compiling the Boost 1.36.0 Math library for Windows Mobile 5 using Visual Studio 2008. I have STLPort-5.1.5 installed. When I get to anything requiring errno support, I get compiler errors as below: compile-c-c++ bin.v2\libs\math\build\msvc-WM5\debug\link-static\runtime-link-static\stdlib-stlport\threading-multi\acosh.obj acosh.cpp Unknown EVC++ compiler version - please run the configure tests and report the results eMbedded Visual C++ 3 and .NET don't have a errno.h header; STLport won't include native errno.h here C:\boost\boost_1_36_0\boost/math/policies/error_handling.hpp(149) : error C2065: 'errno_t' : undeclared identifier [...] C:\boost\boost_1_36_0\boost/math/policies/error_handling.hpp(149) : error C2065: 'EDOM' : undeclared identifier [..] C:\boost\boost_1_36_0\boost/math/policies/error_handling.hpp(233) : error C2065: 'ERANGE' : undeclared identifier In the STLPort errno.h header, there's a section: #ifdef _STLP_WCE // only show message when directly including this file in a non-library build # if !defined(__BUILDING_STLPORT) && (_STLP_OUTERMOST_HEADER_ID == 0x205) # pragma message("eMbedded Visual C++ 3 and .NET don't have a errno.h header; STLport won't include native errno.h here") #define errno errno_t I can add an "#include<crtdefs.h>" to get errno_t support, but that just declares it as "typedef int errno_t;". Which, of course, gives me " boost/math/policies/error_handling.hpp(149) : error C2513: 'int' : no variable declared before '=' " errors as that isn't the way Boost expects to be able to use errno. What can I do to either get errno support under CE or remove the dependency of that feature without breaking Boost? Thanks, PaulH

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[Serialization] Compatibility of text archives in 1.36 and 1.34
by Glenn Ramsey 02 Sep '08

02 Sep '08

Hi, I recently upgraded from boost 1.34 to boost 1.36. A version of my application built with 1.36 can read the text archives produced by 1.34, but a version of my application built with 1.34 cannot read the text archives produced by 1.36. Is this the behaviour that I should expect? Glenn -- Glenn Ramsey http://www.componic.co.nz

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Re: [Boost-users] Changing from std::map to boost::bimap
by Sean Farrow 02 Sep '08

02 Sep '08

Hi: I got that far, however I carn't seem to declare iterators properly: With the previously used map scheme, my iterator was declared as follows: Std::map<std::bitset<6>, int>::iterator DotsIterator; How do I convert this to use boost::bimap. Cheers Sean. -----Original Message----- From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Daryle Walker Sent: 01 September 2008 20:34 To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] Changing from std::map to boost::bimap On Aug 31, 2008, at 6:56 AM, Sean Farrow wrote: > I am looking to change from std::map to boost::bimap. > I have the following defined: > std::bimap<std::bitset<6>, int, BitSetComp> DotsList; > And > boost::bimap<std::bitset<6>, int, BitSetComp>::iterator DotsIterator; [SNIP] > How do I change these definitions to use boost::bimap. > Any help appreciated. A bimap can act as two regular maps, and does so through two special public data members. The "left" member acts like a map<bitset, int, BitSetComp>, and the "right" member flips the first two arguments. There are also type-aliases defined for each iterator, left or right. There is also a mode that acts like a std::set< std::pair< std::bitset< 6 >, int > > >. Read the docs for the specific names and modes. -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com _______________________________________________ Boost-users mailing list Boost-users(a)lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users __________ Information from ESET NOD32 Antivirus, version of virus signature database 3406 (20080902) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 3406 (20080902) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

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Problem with Boost.Test (1.36.0) and Visual Studio 2008 SP1
by Matthieu Brucher 02 Sep '08

02 Sep '08

Hi, I'm trying to build a test suite that worked with Linux and an older Boost version (1.34.1). I tried to compile it with Visual Studio 2008 SP1 with Boost 1.36 and I ran into this error : link /nologo /OUT:IRT_test_suit.exe /LIBPATH:D:\Travail\boost_1_36_0\lib "/LIBPA TH:D:\Python 2.5\libs" /LIBPATH:. IRT.lib boost_unit_test_framework-vc90-mt-1_36 .lib tools\boost_main_test.obj test_light.obj boost_unit_test_framework-vc90-mt-1_36.lib(boost_unit_test_framework-vc90-mt-1_3 6.dll) : error LNK2005: "public: static class boost::unit_test::unit_test_log_t & __cdecl boost::unit_test::singleton<class boost::unit_test::unit_test_log_t>:: instance(void)" (?instance@?$singleton@Vunit_test_log_t@unit_test@boost@@@unit_t est@boost@@SAAAVunit_test_log_t@23@XZ) déjà défini(e) dans test_light.obj IRT_test_suit.exe : fatal error LNK1169: un ou plusieurs symboles définis à diff érentes reprises ont été rencontrés boost_main_test.cpp consists of: #define BOOST_TEST_DYN_LINK #define BOOST_TEST_MODULE "IRT test suit" #include <boost/test/unit_test.hpp> And test_light.cpp: #include <boost/test/unit_test.hpp> Both files were compiled with the arguments cl /nologo /EHsc /Ox /MD -D_CRT_SECURE_NO_DEPRECATE -DWIN32 /TP /ID:\Travail\boo st_1_36_0 /I. /c test_light.cpp /Fotest_light.obj I didn't find a thing on the Internet with this issue, so I hope someone will have a clue... Matthieu -- French PhD student Website : http://matthieu-brucher.developpez.com/ Blogs : http://matt.eifelle.com and http://blog.developpez.com/?blog=92 LinkedIn : http://www.linkedin.com/in/matthieubrucher

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Errors when defining iterators for use with boost::bimap
by Sean Farrow 02 Sep '08

02 Sep '08

Hi: I am defining the following iterator with boost::bimap: typedef boost::bimap<std::bitset<6>, int, BitSetComp>::left_map::iterator DotsIterator; I get the following error amonst others: error C2903: 'rebind' : symbol is neither a class template nor a function template bimap_core.hpp 408 Should I have included something. If not how do I use boost::bimap with comparison operators within iterators. Note the following won't compile either: typedef boost::bimap<std::bitset<6>, int>::left_map::iterator DotsIterator; Any help apreciated. Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3408 (20080902) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com

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