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boost.lambda and std::abs(double)
by Olaf Peter 09 Apr '08

09 Apr '08

Hi, why does the following code not compile? ---8<--- #include <iostream> #include <boost/array.hpp> #include <boost/lambda/lambda.hpp> #include <algorithm> #include <cmath> int main() { using namespace ::boost::lambda; const boost::array<double, 10> factor = { 1e12, 1e9, 1e6, 1e3, 1, 1e-3, 1e-6, 1e-9, 1e-12, 1e-15 }; boost::array<double, 10> values; std::transform( factor.begin(), factor.end(), values.begin(), std::abs( ret<double>( 1e3 / _1 ) ) ); } --->8--- si_short.cpp: In function 'int main()': si_short.cpp:28: error: no matching function for call to 'abs(const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::explicit_return_type_action<double>, boost::tuples::tuple<boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost::lambda::arithmetic_action<boost::lambda::divide_action>, boost::tuples::tuple<const double, boost::lambda::lambda_functor<boost::lambda::placeholder<1> >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> > >)' /usr/include/stdlib.h:691: note: candidates are: int abs(int) /usr/include/c++/4.2/cstdlib:143: note: long int std::abs(long int) /usr/include/c++/4.2/cstdlib:174: note: long long int __gnu_cxx::abs(long long int) /usr/include/c++/4.2/cmath:89: note: double std::abs(double) /usr/include/c++/4.2/cmath:93: note: float std::abs(float) /usr/include/c++/4.2/cmath:97: note: long double std::abs(long double) Thanks, Olaf

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Fwd: RE: boost build for Windows
by rishi keisham 09 Apr '08

09 Apr '08

This is one of the solution to boost build for Windows... as stated by Thomas. Thanks, Keisham Note: forwarded message attached. --------------------------------- From Chandigarh to Chennai - find friends all over India. Click here.

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[Serialization] Why is std::string a primitive type? Tracking for share_ptr
by Jeffrey A. Edlund 08 Apr '08

08 Apr '08

I'm trying to serialize a hierarchical data structure like the following: class StorageVar; typedef std::vector<StorageVar> sv_list; typedef std::map<std::string, StorageVar > sv_dict; typedef std::pair<std::string, StorageVar > sv_dict_pair; typedef boost::variant < boost::shared_ptr<size_t>,boost::shared_ptr<int>,boost::shared_ptr<double>,boost::shared_ptr<std::string>, boost::shared_ptr<std::vector<size_t> >, boost::shared_ptr<std::vector<int> >, boost::shared_ptr<std::vector<double> >, boost::recursive_wrapper<boost::shared_ptr< sv_list > >, boost::recursive_wrapper<boost::shared_ptr< sv_dict > >, boost::recursive_wrapper<boost::shared_ptr< sv_dict_pair > > > StorageVar_data_imp; class StorageVar_imp { public: StorageVar_imp(): data(new StorageVar_data_imp) {}; boost::shared_ptr<StorageVar_data_imp> data; boost::shared_ptr<sv_dict> attributes; }; class StorageVar { public: boost::shared_ptr<StorageVar_imp> content; StorageVar(): content(new StorageVar_imp) {}; /* Further functionality removed for clarity. */ } I had been hoping to serialize this nonintrustively, but quickly ran into problems. Here's my understanding of the situation: As has been mentioned on the list before, Boost.Serialize refuses to serialize shared_ptrs to primitive types because tracking is turned off for primitive types and cannot be turned on. Primitive types used in my example include size_t,int,double, and std::string. I can understand (sort of) why you wouldn't want to track all the numeric types, but I don't understand why std::string is considered now considered a primitive. (Looking at boost/serialization/string.hpp indicates that it wasn't a primitive type at some point.) The way that's mentioned in the archive to get around this is to use BOOST_STRONG_TYPEDEF(int,tracked_int) etc. This would require that I change the data structure (an intrusive change) and add a static_cast< T&>(variable) everywhere these wrapped variables are used. (This is because the "strong" typedef really just makes a new class with your type inside it with basic methods defined.) The other possible solution that I've looked at is to define void serialize(Archive &ar, boost::shared_ptr<T> & arg, const unsigned int version) myself for all my primitive types. That seems like the wrong thing to do, but I'll probably do something with that until I find a better way. I might be missing something, but couldn't boost/serialization/shared_ptr.hpp be rewritten to keep track of all the pointers that it sees without turning tracking on for all primitive types? Basically just automatically track anything that's inside a shared_ptr. The programmer shouldn't be storing both a shared_ptr to memory and a normal pointer to the same memory anyway. Other info: Boost trunk r44086 (yesterday) built on Ubuntu with g++. (I had been using 1.33.1 but that seemed to have problems serializing vector<int>.) Thanks, Jeffrey

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Failure while building the library with bjam
by Michael Bradley Jr 08 Apr '08

08 Apr '08

Hi, while building the boost library (trunk) we getting the following message: compiler MS Visual Studio 2005 @ win XP SP2 any help to overcome this? Thanks in advance Best regards Mike C:\boost>"bin\bjam.exe" -d 0 stage --stagedir=. toolset=msvc-8.0 link=static runtime-link=s tatic threading=multi --without-mpi architecture=x86 release debug address-model=32 warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (don't panic: this is a strictly optional feature). text_iarchive.cpp .\boost/archive/detail/basic_iarchive.hpp(103) : error C2259: 'boost::archive::detail::basic_iarchiv e' : cannot instantiate abstract class due to following members: 'void boost::archive::detail::basic_iarchive::vload(boost::archive::tracking_type &)' : is a bstract .\boost/archive/detail/basic_iarchive.hpp(54) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_name_type &)' : is abstract .\boost/archive/detail/basic_iarchive.hpp(53) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_id_optional_type & )' : is abstract .\boost/archive/detail/basic_iarchive.hpp(52) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_id_type &)' : is a bstract .\boost/archive/detail/basic_iarchive.hpp(51) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::object_id_type &)' : is abstract .\boost/archive/detail/basic_iarchive.hpp(50) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::version_type &)' : is ab stract .\boost/archive/detail/basic_iarchive.hpp(49) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' .\boost/cstdint.hpp(179) : error C2143: syntax error : missing ';' before 'namespace' .\boost/cstdint.hpp(179) : error C4430: missing type specifier - int assumed. Note: C++ does not sup port default-int text_oarchive.cpp .\boost/archive/detail/basic_oarchive.hpp(98) : error C2259: 'boost::archive::detail::basic_oarchive ' : cannot instantiate abstract class due to following members: 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::tracking_type)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(60) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::class_name_type &) ' : is abstract .\boost/archive/detail/basic_oarchive.hpp(59) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::class_id_reference _type)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(58) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::class_id_optional_ type)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(57) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::class_id_type)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(56) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::object_reference_t ype)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(55) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::object_id_type)' : is abstract .\boost/archive/detail/basic_oarchive.hpp(54) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' 'void boost::archive::detail::basic_oarchive::vsave(const boost::archive::version_type)' : i s abstract .\boost/archive/detail/basic_oarchive.hpp(53) : see declaration of 'boost::archive::detail:: basic_oarchive::vsave' .\boost/cstdint.hpp(179) : error C2143: syntax error : missing ';' before 'namespace' .\boost/cstdint.hpp(179) : error C4430: missing type specifier - int assumed. Note: C++ does not sup port default-int xml_iarchive.cpp .\boost/archive/detail/basic_iarchive.hpp(103) : error C2259: 'boost::archive::detail::basic_iarchiv e' : cannot instantiate abstract class due to following members: 'void boost::archive::detail::basic_iarchive::vload(boost::archive::tracking_type &)' : is a bstract .\boost/archive/detail/basic_iarchive.hpp(54) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_name_type &)' : is abstract .\boost/archive/detail/basic_iarchive.hpp(53) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_id_optional_type & )' : is abstract .\boost/archive/detail/basic_iarchive.hpp(52) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::class_id_type &)' : is a bstract .\boost/archive/detail/basic_iarchive.hpp(51) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::object_id_type &)' : is abstract .\boost/archive/detail/basic_iarchive.hpp(50) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' 'void boost::archive::detail::basic_iarchive::vload(boost::archive::version_type &)' : is ab stract .\boost/archive/detail/basic_iarchive.hpp(49) : see declaration of 'boost::archive::detail:: basic_iarchive::vload' .\boost/cstdint.hpp(179) : error C2143: syntax error : missing ';' before 'namespace' .\boost/cstdint.hpp(179) : error C4430: missing type specifier - int assumed. Note: C++ does not sup port default-int xml_oarchive.cpp

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[string_algo] case insensitive compare
by Ovanes Markarian 08 Apr '08

08 Apr '08

Hello *, I have a question regarding string comparisons. Are the comparisons below suppose to work in VC 7.1 boost 1.34.0? Case 1: bool is_test_string(std::string const& str) { std::string const& compare_with=std::string("test_string"); boost::algorithm::is_iequal comparator; return comparator(str, compare_with); } Case 2: bool is_test_string(std::string const& str) { char const* compare_with = "test_string"; boost::algorithm::is_iequal comparator; return comparator(str, compare_with); } Case 3: bool is_test_string(std::string const& str) { boost::algorithm::is_iequal comparator; return comparator(str, "test_string"); } In all 3 cases I receive compiler erros. Many thanks, Ovanes

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boost file system library question
by Dan Sherman 08 Apr '08

08 Apr '08

All, I have been having some bad experiences with copying directories. I am currently using system(xcopy /e source destination). Sometimes it works, and sometimes it doesn't which landed me here. I am trying to get a simple test working to emulate this with the boost libs. I have only been coding in C++ for two weeks. So I accept all suggestions and critisim. Also if anyone had any insight into the security implications of the xcopy system call vs. the boost filesystem lib that would be helpful. Thanks in advance, Dj

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[BGL] Hypergraphs
by Ioannis Nousias 08 Apr '08

08 Apr '08

Hi everyone. Are hypergraphs representable in BGL? I'm interested in a hypergraph partitioning algorithm using boost. regards, Ioannis -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.

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boost build for Windows
by rishi keisham 08 Apr '08

08 Apr '08

Hi all, I am trying to build boost for Windows... , I am currently using Visual studio 2005 Express edition (vc8). Here are the steps that I follow. 1) download boost_1_33_1 2) run build.bat from c:\boost_1_33_1\tools\build\jam_src. 3) copy bjam.exe to c:\windows . 4) set BOOST_BUILD_PATH=c:\boost_1_33_1\tools\build\v2 5) Modify user_config.jam accordingly to using msvc : 8.0 ; 6) set BOOST_ROOT = c:\boost_1_33_1 7) run bjam... But I got C:\boost_1_33_1>bjam ****************************************************** Building Boost.Iostreams with bzip2 support disabled. To enable bzip2, consult the Boost.Iostreams documentation ****************************************************** ****************************************************** Building Boost.Iostreams with zlib and gzip support disabled. To enable zlib and gzip, consult the Boost.Iostreams documentation ****************************************************** --------------------------------------------------------------------- *** If you don't need Boost.Python, you can ignore this section *** *** pass --without-python to suppress this message in the future *** skipping Boost.Python library build due to missing or incorrect configuration couldn't find Python.h in "c:/Python24/include" You can configure the location of your python installation by setting: PYTHON_VERSION - The 2-part python Major.Minor version number (e.g. "2.2", NOT "2.2.1") - currently "2.4" PYTHON_ROOT - automatically configured from PYTHON_VERSION if not otherwise set ; currently "c:/Python24" The following are automatically configured from PYTHON_ROOT if not otherwise set: PYTHON_LIB_PATH - path to Python library object; currently "c:/Python24/libs" --------------------------------------------------------------------- Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (and if you don't know what ICU is then you probably don't need it). ...found 9007 targets... ...updating 1238 targets... vc-C++ bin\boost\libs\date_time\build\boost_date_time.dll\vc-7_1\debug\threading -multi\greg_month.obj The system cannot find the path specified. The system cannot find the path specified. CALL "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\VCVARS32.BA T" >nul "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\cl" /Zm800 -nol ogo /EHsc -c -DBOOST_ALL_DYN_LINK=1 -DUSE_DATE_TIME_PRE_1_33_FACET_IO /Z7 /Od /Ob0 /EHsc /GR /MDd /Op /wd4675 /Zc:forScope /Zc:wchar_t -I"bin\boost\libs\dat e_time\build" -I"C:\boost_1_33_1" -Fo"bin\boost\libs\date_time\build\boost_d ate_time.dll\vc-7_1\debug\threading-multi\greg_month.obj" -Tp"C:\boost_1_33_1\l ibs\date_time\build\../src/gregorian/greg_month.cpp" ...failed vc-C++ bin\boost\libs\date_time\build\boost_date_time.dll\vc-7_1\debug \threading-multi\greg_month.obj... vc-C++ bin\boost\libs\date_time\build\boost_date_time.dll\vc-7_1\debug\threading -multi\greg_weekday.obj The system cannot find the path specified. The system cannot find the path specified. CALL "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\VCVARS32.BA T" >nul "C:\Program Files\Microsoft Visual Studio .NET 2003\VC7\bin\cl" /Zm800 -nol ogo /EHsc -c -DBOOST_ALL_DYN_LINK=1 -DUSE_DATE_TIME_PRE_1_33_FACET_IO /Z7 /Od /Ob0 /EHsc /GR /MDd /Op /wd4675 /Zc:forScope /Zc:wchar_t -I"bin\boost\libs\dat e_time\build" -I"C:\boost_1_33_1" -Fo"bin\boost\libs\date_time\build\boost_d ate_time.dll\vc-7_1\debug\threading-multi\greg_weekday.obj" -Tp"C:\boost_1_33_1 \libs\date_time\build\../src/gregorian/greg_weekday.cpp" ...failed vc-C++ bin\boost\libs\date_time\build\boost_date_time.dll\vc-7_1\debug \threading-multi\greg_weekday.obj... vc-C++ bin\boost\libs\date_time\build\boost_date_time.dll\vc-7_1\debug\threading -multi\date_generators.obj its very stranger that it always take the path for vc7.1. Can Anyone tell what is the other way to build boost for Windows. I have previously tried for Monta Vista Linux too, sorry its fails to compile. Thanks, Rishi --------------------------------- Bollywood, fun, friendship, sports and more. You name it, we have it.

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Cannot compile boost 1.35 under ubuntu linux
by Germán Diago 08 Apr '08

08 Apr '08

Hello. I tried to configure boost in order to be able to install it. But the configure archive seems to be broken. bash: ./configure: /bin/sh^M: bad interpreter: No such file or directory The output shows a ^M symbol after /bin/sh. It seems to be an encoding problem. So I tried to delete that line and invoke the script with the shell explicitly: /bin/bash ./configure --prefix=/usr But I get this error: : command not found: : command not found: : command not found2: : command not found7: '/configure: line 29: syntax error near unexpected token `do '/configure: line 29: `do Any solution, please? Thanks in advance.

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boost.lambda for_each and boost.array
by Olaf Peter 08 Apr '08

08 Apr '08

Hi, these snipped doesn't compile, but why? ---8<--- #include <iostream> #include <boost/array.hpp> #include <boost/lambda/lambda.hpp> int main() { using namespace ::boost::lambda; boost::array<double, 10> values; for_each( values.begin(), values.end(), _1 = 2.0 ); for_each( values.begin(), values.end(), std::cout << _1 << '\n'); } --->8--- error: 'for_each' was not declared in this scope using std::list compiles and works. Did I miss something? Thanks, Olaf

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