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How to replace the std::string to myown string in boost::filesystem
by SONGFY 12 Jul '10

12 Jul '10

For the changing of the std::string allocator, I retypedef the std::string to my string, just like this: namespace MyNamespace { template<typename Elem, typename Traits> class basic_string : public std::basic_string<Elem, Traits, STLAllocator<Elem> > { // reimplement the typedefs and constructors. }; typedef basic_string<char, std::char_traits<char> > string; typedef basic_string<wchar_t, std::char_traits<wchar_t> > wstring; } So I want the boost::filesystem use my own string type, but I met some problem: The code like this: namespace MyNamespace { struct path_traits; typedef boost::filesystem::basic_path<string, path_traits> path; typedef boost::filesystem::basic_path<wstring, path_traits> wpath; struct path_traits { typedef string internal_string_type; typedef string external_string_type; static external_string_type to_external( const path &, const internal_string_type & src ) { return src; } static internal_string_type to_internal( const external_string_type & src ) { return src; } }; typedef boost::filesystem::basic_recursive_directory_iterator<path> recursive_directory_iterator; typedef boost::filesystem::basic_recursive_directory_iterator<wpath> wrecursive_directory_iterator; } namespace boost { namespace filesystem { template<> struct is_basic_path<MyNamespace::path> { BOOST_STATIC_CONSTANT( bool, value = true ); }; template<> struct is_basic_path<MyNamespace::wpath> { BOOST_STATIC_CONSTANT( bool, value = true ); }; } } namespace MyNamespace { inline bool is_directory( const path & ph ) { return boost::filesystem::is_directory<path>( ph ); } inline bool is_directory( const wpath & ph ) { return boost::filesystem::is_directory<wpath>( ph ); } } For replace all the function is a huge work, and in this way I can not replace it for I met this function: BOOST_FILESYSTEM_DECL file_status status_api( const std::string & ph, system::error_code & ec ); Maybe this way is too bother, I think there must be an easy way to replace the string. Is there any way to resolve this? Thank you.

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[Users][Property Tree] Problem with compiling basic_tree<std::string, ...>
by Jani Plesnicar 11 Jul '10

11 Jul '10

Hy i have problem with #include "windows.h" #include <boost/bind.hpp> #include <boost/function.hpp> #include <iostream> #include <map> #include <boost/property_tree/ptree.hpp> #include <boost/property_tree/json_parser.hpp> #include <boost/property_tree/info_parser.hpp> #include <boost/property_tree/xml_parser.hpp> #include <boost/property_tree/exceptions.hpp> #include <boost/property_tree/ptree_fwd.hpp> #include <boost/property_tree/string_path.hpp> #include <boost/property_tree/stream_translator.hpp> #include <boost/property_tree/exceptions.hpp> #include <boost/property_tree/detail/ptree_utils.hpp> namespace property_tree = boost::property_tree; namespace json_parser = boost::property_tree::json_parser; namespace info_parser = boost::property_tree::info_parser; namespace xml_parser = boost::property_tree::xml_parser; class DataHold { public: const DataHold& DataHold::operator=(const DataHold& oth) { return oth; } DataHold::DataHold(void) : _dht(DHT_NULL) {/**/} DataHold::DataHold(int* d) : _d_pint(d), _dht(DHT_PINT) {/**/} DataHold::DataHold(char* d) : _d_pchar(d), _dht(DHT_PCHAR) {/**/} DataHold::DataHold(float* d) : _d_pfloat(d), _dht(DHT_PFLOAT) {/**/} DataHold::DataHold(double* d) : _d_pdouble(d), _dht(DHT_PDOUBLE) {/**/} DataHold::DataHold(bool* d) : _d_pbool(d), _dht(DHT_PBOOL) {/**/} DataHold::DataHold(std::string* d) : _d_pstdstr(d), _dht(DHT_PSTDSTRING) {/**/} typedef enum { DHT_NULL, DHT_PINT, DHT_PCHAR, DHT_PBOOL, DHT_PFLOAT, DHT_PDOUBLE, DHT_PSTDSTRING } DATA_HOLD_TYPE; DATA_HOLD_TYPE DataHold::TypeIndex() const {return _dht;} int* _d_pint; char* _d_pchar; bool* _d_pbool; float* _d_pfloat; double* _d_pdouble; std::string* _d_pstdstr; bool empty() const { return _dht==DHT_NULL; } friend std::ostream& operator<< (std::ostream &os,const DataHold &me) { os << (int)(me.TypeIndex()); return os; } private: friend class property_tree::basic_ptree<std::string,DataHold>; void swap(DataHold& x) { int* dint = x._d_pint; char* dchr = x._d_pchar; bool* dbol = x._d_pbool; float* dflt = x._d_pfloat; double* ddbl = x._d_pdouble; std::string* dstr = x._d_pstdstr; DATA_HOLD_TYPE dht = x._dht; x._d_pint = this->_d_pint; x._d_pchar = this->_d_pchar; x._d_pbool = this->_d_pbool; x._d_pfloat = this->_d_pfloat; x._d_pdouble = this->_d_pdouble; x._d_pstdstr = this->_d_pstdstr; x._dht = this->_dht; this->_d_pint = dint; this->_d_pchar = dchr; this->_d_pbool = dbol; this->_d_pfloat = dflt; this->_d_pdouble = ddbl; this->_d_pstdstr = dstr; this->_dht = dht; } DATA_HOLD_TYPE _dht; }; namespace prop_tree { typedef property_tree::basic_ptree<std::string,DataHold> ptreedh; }; int main(int argc, char** argv) { std::string nejm = "Test"; std::string priimk = "Bla"; int dejt[3] = {14, 06, 2010}; float height = 181.5f; float weight = 57.5f; prop_tree::ptreedh ptree_rt; prop_tree::ptreedh pt = ptree_rt.put("oseba.ime", DataHold(&nejm)); std::cout << ptree_rt.get_value("oseba.ime"); system("pause"); return 0; } I get these errors in Visual Studio C++ 2008 when trying to compile. 1>------ Build started: Project: DebugServerLib, Configuration: Debug Win32 ------ 1>Compiling... 1>main.cpp 1>p:\cpp\boost\include\boost-1_42\boost\property_tree\detail\ptree_implementation.hpp(655) : error C2027: use of undefined type 'boost::property_tree::translator_between<Internal,External>' 1> with 1> [ 1> Internal=DataHold, 1> External=std::basic_string<char,std::char_traits<char>,std::allocator<char>> 1> ] 1> p:\cpp\boost\include\boost-1_42\boost\property_tree\detail\ptree_implementation.hpp(666) : see reference to function template instantiation 'std::basic_string<_Elem,_Traits,_Ax> boost::property_tree::basic_ptree<Key,Data>::get_value<std::basic_string<_Elem,_Traits,_Ax>>(const Type &) const' being compiled 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char>, 1> _Ax=std::allocator<char>, 1> Key=std::string, 1> Data=DataHold, 1> Type=std::basic_string<char,std::char_traits<char>,std::allocator<char>> 1> ] 1> p:\cpp\debugserverlib\debugserverlib\main.cpp(156) : see reference to function template instantiation 'std::basic_string<_Elem,_Traits,_Ax> boost::property_tree::basic_ptree<Key,Data>::get_value<char>(const Ch *) const' being compiled 1> with 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char>, 1> _Ax=std::allocator<char>, 1> Key=std::string, 1> Data=DataHold, 1> Ch=char 1> ] 1>p:\cpp\boost\include\boost-1_42\boost\property_tree\detail\ptree_implementation.hpp(655) : error C2955: 'boost::type' : use of class template requires template argument list 1> p:\cpp\boost\include\boost-1_42\boost\type.hpp(14) : see declaration of 'boost::type' 1>p:\cpp\boost\include\boost-1_42\boost\property_tree\detail\ptree_implementation.hpp(655) : error C2780: 'boost::enable_if<boost::property_tree::detail::is_character<Ch>,std::basic_string<Ch>>::type boost::property_tree::basic_ptree<Key,Data>::get_value(const Ch *) const' : expects 1 arguments - 2 provided 1> with 1> [ 1> Key=std::string, 1> Data=DataHold 1> ] 1> p:\cpp\boost\include\boost-1_42\boost\property_tree\ptree.hpp(344) : see declaration of 'boost::property_tree::basic_ptree<Key,Data>::get_value' 1> with 1> [ 1> Key=std::string, 1> Data=DataHold 1> ] 1>p:\cpp\boost\include\boost-1_42\boost\property_tree\detail\ptree_implementation.hpp(655) : error C2780: 'boost::disable_if<boost::property_tree::detail::is_translator<Type>,Type>::type boost::property_tree::basic_ptree<Key,Data>::get_value(const Type &) const' : expects 1 arguments - 2 provided 1> with 1> [ 1> Key=std::string, 1> Data=DataHold 1> ] 1> p:\cpp\boost\include\boost-1_42\boost\property_tree\ptree.hpp(336) : see declaration of 'boost::property_tree::basic_ptree<Key,Data>::get_value' 1> with 1> [ 1> Key=std::string, 1> Data=DataHold 1> ] 1>p:\cpp\boost\include\boost-1_42\boost\property_tree\detail\ptree_implementation.hpp(655) : error C2784: 'boost::enable_if<boost::property_tree::detail::is_character<Ch>,std::basic_string<Ch>>::type boost::property_tree::basic_ptree<Key,Data>::get_value(const Ch *,Translator) const' : could not deduce template argument for 'const Ch *' from 'const std::basic_string<_Elem,_Traits,_Ax>' 1> with 1> [ 1> Key=std::string, 1> Data=DataHold 1> ] 1> and 1> [ 1> _Elem=char, 1> _Traits=std::char_traits<char>, 1> _Ax=std::allocator<char> 1> ] 1> p:\cpp\boost\include\boost-1_42\boost\property_tree\ptree.hpp(328) : see declaration of 'boost::property_tree::basic_ptree<Key,Data>::get_value' 1> with 1> [ 1> Key=std::string, 1> Data=DataHold 1> ] 1>p:\cpp\boost\include\boost-1_42\boost\property_tree\detail\ptree_implementation.hpp(655) : error C2780: 'Type boost::property_tree::basic_ptree<Key,Data>::get_value(void) const' : expects 0 arguments - 2 provided 1> with 1> [ 1> Key=std::string, 1> Data=DataHold 1> ] 1> p:\cpp\boost\include\boost-1_42\boost\property_tree\ptree.hpp(313) : see declaration of 'boost::property_tree::basic_ptree<Key,Data>::get_value' 1> with 1> [ 1> Key=std::string, 1> Data=DataHold 1> ] 1>p:\cpp\boost\include\boost-1_42\boost\property_tree\detail\ptree_implementation.hpp(655) : error C2780: 'boost::enable_if<boost::property_tree::detail::is_translator<Translator>,Type>::type boost::property_tree::basic_ptree<Key,Data>::get_value(Translator) const' : expects 1 arguments - 2 provided 1> with 1> [ 1> Key=std::string, 1> Data=DataHold 1> ] 1> p:\cpp\boost\include\boost-1_42\boost\property_tree\ptree.hpp(306) : see declaration of 'boost::property_tree::basic_ptree<Key,Data>::get_value' 1> with 1> [ 1> Key=std::string, 1> Data=DataHold 1> ] 1>Build Time 0:05 1>Build log was saved at "file://p:\cpp\DebugServerLib\DebugServerLib\Debug\BuildLog.htm" 1>DebugServerLib - 7 error(s), 0 warning(s) ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

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A MPL loop..
by Frank Winter 11 Jul '10

11 Jul '10

I am trying to translate this runtime loop while( totalsize * maxelem * 3 > poolsize ) maxelem >>= 1; into MPL. I got so far: template< typename totalsize , typename maxelement , typename poolsize > struct loop { typedef mpl::times< totalsize , maxelement > part0; typedef mpl::times< part0 , mpl::int_< 3 > > part1; typedef mpl::greater< part1 , poolsize > gr; typedef mpl::if_< gr , typename loop< totalsize , mpl::divides< maxelement , mpl::int_< 2 > > , poolsize >::value , maxelement > value; }; template< class totalsize , class poolsize > struct loop< totalsize , mpl::int_< 1 > , poolsize > { typedef mpl::int_< 1 > value; }; typename loop< mpl::int_< 144 > , mpl::int_< 1024 > , mpl::int_< 140000 > > ::value max; g++43 (GCC) 4.3.2 says: error: template instantiation depth exceeds maximum of 500 If coded it correctly that should not happen. Since maxelement is already after the 1st interation mpl::int_< 512 > and therefor the product with mpl::int_< 144 > smaller than mpl::int_< 140000 > I could imagine: - that I need a constructor that converts the divided types, correct? - that I need to use a vector< sequence > like in the physics dimension example, correct? Can somebody fix this or point me to a working loop example? Regards, Frank

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bjam cross compile linking with wrong libs
by Mark Freeman 11 Jul '10

11 Jul '10

Hi, I'm trying to cross compile a simple program using libtorrent but falling foul of some settings in the boost build system. I am totally green at using boost so please excuse me if the answer is obvious. The problem is that the link line emitted by the boost build system appears to include a hard coded reference to a NATIVE lib (/usr/lib/ libdl.so) and not the one for the TARGET build system. Below is the output from the bjam command: BOOST_ROOT = /projects/externals/libtorrent/boost_1_43_0 OS = LINUX gcc.link bin/gcc-arm/debug/boost-source/link-static/threading-multi/ enum_if "${CROSS_COMPILE}gcc" -Wl,-R -Wl,"/usr/lib" -o "bin/gcc-arm/ debug/boost-source/link-static/threading-multi/enum_if" -Wl,--start- group "bin/gcc-arm/debug/boost-source/link-static/threading-multi/ enum_if.o" "../bin/gcc-arm/debug/boost-source/link-static/threading- multi/libtorrent.a" "/projects/externals/libtorrent/boost_1_43_0/ bin.v2/libs/thread/build/gcc-arm/debug/boost-source/link-static/ threading-multi/libboost_thread.a" "/projects/externals/libtorrent/ boost_1_43_0/bin.v2/libs/filesystem/build/gcc-arm/debug/boost-source/ link-static/threading-multi/libboost_filesystem.a" "/projects/ externals/libtorrent/boost_1_43_0/bin.v2/libs/system/build/gcc-arm/ debug/boost-source/link-static/threading-multi/libboost_system.a" "/ usr/lib/libdl.so" -Wl,-Bstatic -lssl -lcrypto -Wl,-Bdynamic -lrt - Wl,--end-group -g -pthread -export-dynamic /usr/lib/libdl.so: could not read symbols: File in wrong format collect2: ld returned 1 exit status ...failed updating 1 target... (CROSS_COMPILE has been set to the prefix for the toolset) I did add a <linkflags> entry to the GCC entry in usr-config.jam and sure enough this did appear in the emitted link line however /usr/lib was still there too and seemed to take precedence. Does anyone know what I have to do to remove this? Cheers, Mark.

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boost::asio::error::eof
by Lloyd 11 Jul '10

11 Jul '10

Hi, I am asynchromously reading from a file. At the file read handler there is an error checking like this- if(error==boost::asio::error::eof) { //do something } else { cout<<error.messge()<<endl; } When the end of file reaches, the control does not enter into the "if portion", instead it enters the else condition and prints the message "Reached the end of the file". Am I comparing error wrongly? or else where could be the problem? How can I know that the end of file has reached? Thanks a lot, Lloyd ______________________________________ Scanned and protected by Email scanner

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asio::async_write, how to delete data after
by Matteo Lanzi 11 Jul '10

11 Jul '10

Hi, I modified a little the echo server example and to build up a simple tcp server; basically what I do is: - Start the server in a thread - When a session is created I start async read - If my session receive a signal I write a data with async write function - Handle data written then start again async read ( otherwise the connection should be closed ) I have some specific functions which prepare packets and then invoke the write method I would like to avoid static allocation of my buffer instead of dynamic one; for doing that I supposed to use shared_array<T> I can't do that because the boost::asio::buffer, required by the write method, doesn't seem to accept smart pointer. So my questions are: - Is there a common pattern to follow for preparing data and delete them after the delivery ? - Is it possible to use smart pointers with async_write ? - Is the async_write executed in another thread ? should I have concurrency problems if I would use an unique output buffer and clear it on the handle_write callback ? Thanks Matteo

3 5

where to find examples
by Abbhishek Misra 11 Jul '10

11 Jul '10

Hello Boost Users, I'm new to boost and have been looking out for good boost usage examples. I'm particularly interested in Concurrent Programing. I could find only following examples . Please let me know where to find rest. http://www.boost.org/doc/libs/1_42_0/doc/html/boost_asio/examples.html regards Abhishek

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[Range] simple (I hope) question
by Kenny Riddile 10 Jul '10

10 Jul '10

Say I have a vector of vectors and I want to sort each "child" vector. How would I accomplish this using range::for_each and range::sort?

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(1.43) unordered_map compile error with Sun CC 12
by Anand Subramanian 10 Jul '10

10 Jul '10

I am getting the following compilation error when using 1.43 version of unordered_map. $ CC -I<BOOST_INCLUDE_DIR> main.cpp -library=stlport4 "<BOOST_INCLUDE_DIR>/boost/unordered/detail/table.hpp", line 38: Error: Could not find a match for boost::unordered_detail::hash_table<boost::unordered_detail::T>::find_iterator<boost::unordered_detail::hash_table<boost::unordered_detail::T>::Key, boost::unordered_detail::hash_table<boost::unordered_detail::T>::Pred>(boost::unordered_detail::T::bucket_ptr, const boost::unordered_detail::Key&, const boost::unordered_detail::Pred&) const. "<BOOST_INCLUDE_DIR>/boost/unordered/detail/table.hpp", line 38: Error: Too many args in template, from boost::unordered_detail::Pred on ignored. "<BOOST_INCLUDE_DIR>/boost/unordered/detail/table.hpp", line 595: Error: Could not find a match for boost::unordered_detail::hash_table<boost::unordered_detail::T>::find(const boost::unordered_detail::Key&, const boost::unordered_detail::Hash&, const boost::unordered_detail::Pred&) const. "<BOOST_INCLUDE_DIR>/boost/unordered/detail/table.hpp", line 595: Error: Too many args in template, from boost::unordered_detail::Hash on ignored. 4 Error(s) detected. $ cat main.cpp #include <boost/unordered_map.hpp> int main() {} The same code compiles using boost 1.38. Is there any idea on what the issue is? -- Anand

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[bjam] boost mpi compiler wrapper
by alfC 10 Jul '10

10 Jul '10

In my system (cluster) there is a mpiCC wrapper for mpi c++ compilation. Unfortunately it is not compatible with bjam detection. so I added the lines: using mpi : mpiCC : <...>... ; to project-config.jam however when trying to compile boost.mpi it still uses g++ so the correct mpi.h file is not detected. I found that if I modifying unsing gcc : : mpiCC : <...> ... ; does the job. So, should I compile the whole boost with mpi compiler wrapper? It doesn't seem elegant and I fear problems in the future for libraries that don't use mpi. Thank you, Alfredo

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