August 2010 - Boost-users - lists.preview.boost.org

[MultiIndex] is it possible to create multi-key key-extractors?
by Mostafa 09 Aug '10

09 Aug '10

Hi, For the following struct: struct Flower { int type; string name; std::list<string> aliases; }; I want to create a multiindexed container that indexes Flower objects by type, name, and aliases, where aliases is some iteratable collection of strings. I just don't know if it's possible to create a multi-key key-extractor for aliases. So far I've come up with the following: typedef boost::multi_index_container< Flower, indexed_by< ordered_unique< member<Flower, int, &Flower::type> >, ordered_unique< member<Flower, string, &Flower::name> >, ordered_unique< //What goes here ... ? > > > FlowerMngr; Thanks, -Mostafa

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[tuples, multi-index] tuples::get as key extractor
by Igor R 09 Aug '10

09 Aug '10

Hello, Consider the following types: typedef tuple<std::string, int> Item; typedef multi_index_container< Item, indexed_by< ordered_non_unique<global_fun<const Item &, int, &tuples::get<1> > > > > Items; The above types don't compile (MSVC10) because of &tuples::get<1>: C2440: 'specialization' : cannot convert from 'overloaded-function' to 'int (__cdecl *)(boost::tuples::tuple<T0,T1> &)' It seems there're several overloaded function templates "tuples::get"... So, what's the correct type of the appropriate function? Or -- is there a more "robust" way to extract the key (without defining explicit function-object)? Thanks!

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Documentation of older releases?
by Robert Jones 08 Aug '10

08 Aug '10

Let me admit up-front that this ignorance is probably my own fault as I've not been paying attention lately, but I see the main documentation list now only includes releases 1.42 & 1.43. Didn't this used to include releases back to about 1.31 or something? Does this mean that documentation of older releases are no longer hosted on the website? Thx - Rob.

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Re: [Boost-users] VS2010 and /clr: fatal error C1001: An internal error has occurred in the compiler
by Soren Dreijer 08 Aug '10

08 Aug '10

> Probably because that causes some assembly to be emitted because of > the efficiency requirements of the mutex, and the CLR does not support > direct assembly. Either get out of the CLR, or do not use anything > that uses low assembly constructs (CLR has its own thread and mutex > classes anyway). Well, so I can't "just get out of the CLR". As I mentioned earlier, this is a managed C++ project that exposes native functionality from other libraries to .NET. That is, I *have* to include the native headers, which in turn include boost. This worked fine in VS2008, too, so it sounds more like a regression in the compiler I think. Also, when compiling for x86, I see the following warning but everything still compiles (the warning is to be expected, as you say yourself): 4>boost_1_43_0_sdk\include\boost\thread\win32\basic_timed_mutex.hpp(160) : warning C4793: 'boost::detail::basic_timed_mutex::unlock' : function compiled as native : 4> Found an intrinsic not supported in managed code / Soren

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[variant] GNU MP Bignum (gmp) compatibility
by Sven Heithecker 08 Aug '10

08 Aug '10

Hello ! The following code compiles correctly and does what I want: #include <iostream> #include <string> #include <boost/variant.hpp> #include <gmpxx.h> using namespace std; typedef boost::variant<int,string> var_t; // COMMENT //typedef boost::variant<mpz_class,mpq_class> var_t; // UNCOMMENT class add : public boost::static_visitor<var_t> { public: template<typename T> var_t operator()(const T &op1, const T &op2) const { return(op1+op2); } template<typename T1, typename T2> var_t operator()(const T1 &op1, const T2 &op2) const { throw; // just for demonstration } }; int main() { var_t v0(2); var_t v1(3); var_t r0 = apply_visitor(add(),v0,v1); cout << r0 << endl; // "5" var_t v10("Hello, "); var_t v11("World !"); var_t r10 = apply_visitor(add(),v10,v11); cout << r10 << endl; // "Hello, World !" var_t error= apply_visitor(add(),v0,v10); // try to add "2" and "Hello, " cout << error << endl; // never executed } However, if I change to the "gmp" Variant typedef indicated above, compilation fails with an error in the boost::variant sources. I tried to extract the core error message: [...] /usr/include/boost/variant/variant.hpp:1293: error: call of overloaded ‘initialize(void*, const char [8])’ is ambiguous /usr/include/boost/variant/detail/initializer.hpp:89: note: candidates are: static int boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::initialize(void*, typename boost::call_traits<typename boost::unwrap_recursive<typename boost::mpl::deref<Iterator>::type>::type>::param_type) [with BaseIndexPair = boost::mpl::pair<boost::detail::variant::make_initializer_node::apply<boost: :mpl::pair<boost::detail::variant::initializer_root, mpl_::int_<0> >, boost::mpl::l_iter<boost::mpl::list2<__gmp_expr<__mpz_struct [1], __mpz_struct [1]>, __gmp_expr<__mpq_struct [1], __mpq_struct [1]> > > >::initializer_node, mpl_::int_<1> >, Iterator = boost::mpl::l_iter<boost::mpl::list1<__gmp_expr<__mpq_struct [1], __mpq_struct [1]> > >] <near match> /usr/include/boost/variant/detail/initializer.hpp:89: note: static int boost::detail::variant::make_initializer_node::apply<BaseIndexPair, Iterator>::initializer_node::initialize(void*, typename boost::call_traits<typename boost::unwrap_recursive<typename boost::mpl::deref<Iterator>::type>::type>::param_type) [with BaseIndexPair = boost::mpl::pair<boost::detail::variant::initializer_root, mpl_::int_<0> >, Iterator = boost::mpl::l_iter<boost::mpl::list2<__gmp_expr<__mpz_struct [1], __mpz_struct [1]>, __gmp_expr<__mpq_struct [1], __mpq_struct [1]> > >] <near match> [...] After having a look at the gmp documentation, especially the "12.6 C++ Interface Limitations" chapter, I think this has something to do with the various conversion functions between the gmp classes and the way how the gmp classes are implemented. Is there any (easy?) way to make boost::variant and gmp compatible ? Regards, Sven -- Sven Heithecker GPG Fingerprint: 527F 06C2 BF51 96CE DFF7 CC89 1A6B DFD5 BEC2 02A6

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Any functions for URL parsing?
by Timothy Madden 08 Aug '10

08 Aug '10

Hello Is there a library in boost to parse an URL ? Like to extract the protocol, username, password, hostname, port, resource, query parametrs, fragment identifiers ? I can see some things about it using the on-site search, but the pages in the results are not accessible and I can find nothing conclusive. Thank you, Timothy Madden

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VS2010 and /clr: fatal error C1001: An internal error has occurred in the compiler
by Soren Dreijer 08 Aug '10

08 Aug '10

I recently switched our product over to VS2010 from VS2008. Our solution consists of several native C++ projects and some managed C++ projects that link to those native projects. The managed C++ projects are compiled with the /clr flag, of course. However, when compiling for x64, one of the files that includes one of the boost mutex headers causes the compiler to spit out the following error: boost_1_43_0_sdk\include\boost\thread\win32\basic_timed_mutex.hpp(158): fatal error C1001: An internal error has occurred in the compiler I've traced down the problem to the following piece of code in basic_timed_mutex.hpp: void unlock() { long const offset=lock_flag_value; // If I comment out this line, compilation works long const old_count=BOOST_INTERLOCKED_EXCHANGE_ADD(&active_count,lock_flag_value); if(!(old_count&event_set_flag_value) && (old_count>offset)) { if(!win32::interlocked_bit_test_and_set(&active_count,event_set_flag_bit )) { win32::SetEvent(get_event()); } } } It would see the BOOST_INTERLOCKED_EXCHANGE_ADD macro causes the compiler to barf. Does anybody have any ideas on why this is, or how to fix it? Cheers, Soren

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[Serialization] Failed to Link "A Very Simple Case"
by Hossein Haeri 07 Aug '10

07 Aug '10

Dear all, Trying the first example of the Boost.Serialization (A Very Simple Case): http://boost-sandbox.sourceforge.net/boost_1_43_0/libs/serialization/doc/tu… I get the error messages in the P.S. section with GCC 4.4.0 MinGW WinXP. Any ideas? TIA, --Hossein P.S. Compiling: main.cpp Linking console executable: bin\Debug\Serial.exe obj\Debug\main.o: In function `text_oarchive': /archive/text_oarchive.hpp:92: undefined reference to `boost::archive::text_oarchive_impl<boost::archive::text_oarchive>::text_oarchive_impl(std::ostream&, unsigned int)' obj\Debug\main.o: In function `text_iarchive': /archive/text_iarchive.hpp:129: undefined reference to `boost::archive::text_iarchive_impl<boost::archive::text_iarchive>::text_iarchive_impl(std::istream&, unsigned int)' /archive/text_iarchive.hpp:129: undefined reference to `boost::archive::detail::shared_ptr_helper::shared_ptr_helper()' obj\Debug\main.o: In function `~text_iarchive': /archive/text_iarchive.hpp:131: undefined reference to `boost::archive::detail::shared_ptr_helper::~shared_ptr_helper()' /archive/text_iarchive.hpp:131: undefined reference to `boost::archive::detail::shared_ptr_helper::~shared_ptr_helper()' obj\Debug\main.o: In function `~text_oarchive_impl': /archive/text_oarchive.hpp:77: undefined reference to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' /archive/text_oarchive.hpp:77: undefined reference to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' /archive/text_oarchive.hpp:77: undefined reference to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' /archive/text_oarchive.hpp:77: undefined reference to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' /archive/text_oarchive.hpp:77: undefined reference to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' obj\Debug\main.o: /archive/text_oarchive.hpp:77: more undefined references to `boost::archive::basic_text_oprimitive<std::ostream>::~basic_text_oprimitive()' follow obj\Debug\main.o: In function `~text_iarchive_impl': /archive/text_iarchive.hpp:80: undefined reference to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' /archive/text_iarchive.hpp:80: undefined reference to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' /archive/text_iarchive.hpp:80: undefined reference to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' /archive/text_iarchive.hpp:80: undefined reference to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' /archive/text_iarchive.hpp:80: undefined reference to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' obj\Debug\main.o: /archive/text_iarchive.hpp:80: more undefined references to `boost::archive::basic_text_iprimitive<std::istream>::~basic_text_iprimitive()' follow obj\Debug\main.o: In function `~common_oarchive': archive/detail/common_oarchive.hpp:38: undefined reference to `boost::archive::detail::basic_oarchive::~basic_oarchive()' /archive/detail/common_oarchive.hpp:38: undefined reference to `boost::archive::detail::basic_oarchive::~basic_oarchive()' /archive/detail/common_oarchive.hpp:38: undefined reference to `boost::archive::detail::basic_oarchive::~basic_oarchive()' obj\Debug\main.o: In function `~common_iarchive': /archive/detail/common_iarchive.hpp:43: undefined reference to `boost::archive::detail::basic_iarchive::~basic_iarchive()' /archive/detail/common_iarchive.hpp:43: undefined reference to `boost::archive::detail::basic_iarchive::~basic_iarchive()' /archive/detail/common_iarchive.hpp:43: undefined reference to `boost::archive::detail::basic_iarchive::~basic_iarchive()' obj\Debug\main.o: /archive/detail/oserializer.hpp:253: undefined reference to `boost::archive::detail::basic_oarchive::save_object(void const*, boost::archive::detail::basic_oserializer const&)' obj\Debug\main.o: /archive/detail/iserializer.hpp:381: undefined reference to `boost::archive::detail::basic_iarchive::load_object(void*, boost::archive::detail::basic_iserializer const&)' obj\Debug\main.o: In function `oserializer': /archive/detail/oserializer.hpp:112: undefined reference to `boost::archive::detail::basic_oserializer::basic_oserializer(boost::serialization::extended_type_info const&)' obj\Debug\main.o: In function `~oserializer': /archive/detail/oserializer.hpp:133: undefined reference to `boost::archive::detail::basic_oserializer::~basic_oserializer()' /archive/detail/oserializer.hpp:133: undefined reference to `boost::archive::detail::basic_oserializer::~basic_oserializer()' /archive/detail/oserializer.hpp:133: undefined reference to `boost::archive::detail::basic_oserializer::~basic_oserializer()' obj\Debug\main.o: In function `iserializer': /archive/detail/iserializer.hpp:133: undefined reference to `boost::archive::detail::basic_iserializer::basic_iserializer(boost::serialization::extended_type_info const&)' obj\Debug\main.o: In function `~iserializer': /archive/detail/iserializer.hpp:158: undefined reference to `boost::archive::detail::basic_iserializer::~basic_iserializer()' /archive/detail/iserializer.hpp:158: undefined reference to `boost::archive::detail::basic_iserializer::~basic_iserializer()' /archive/detail/iserializer.hpp:158: undefined reference to `boost::archive::detail::basic_iserializer::~basic_iserializer()' obj\Debug\main.o: In function `extended_type_info_typeid': /serialization/extended_type_info_typeid.hpp:86: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::extended_type_info_typeid_0(char const*)' /serialization/extended_type_info_typeid.hpp:88: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::type_register(std::type_info const&)' /serialization/extended_type_info_typeid.hpp:89: undefined reference to `boost::serialization::extended_type_info::key_register() const' /serialization/extended_type_info_typeid.hpp:89: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' obj\Debug\main.o: In function `~extended_type_info_typeid': /serialization/extended_type_info_typeid.hpp:92: undefined reference to `boost::serialization::extended_type_info::key_unregister() const' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::type_unregister()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' /serialization/extended_type_info_typeid.hpp:92: undefined reference to `boost::serialization::extended_type_info::key_unregister() const' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::type_unregister()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' /serialization/extended_type_info_typeid.hpp:92: undefined reference to `boost::serialization::extended_type_info::key_unregister() const' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::type_unregister()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' /serialization/extended_type_info_typeid.hpp:93: undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::~extended_type_info_typeid_0()' obj\Debug\main.o:main.cpp:(.rdata$_ZTVN5boost13serialization6detail17singleton_wrapperINS0_25extended_type_info_typeidI12gps_positionEEEE[vtable for boost::serialization::detail::singleton_wrapper<boost::serialization::extended_type_info_typeid<gps_position> >]+0x8): undefined reference to `boost::serialization::typeid_system::extended_type_info_typeid_0::is_less_than(boost::serialization::extended_type_info const&) const' Process terminated with status 1 (0 minutes, 18 seconds) 50 errors, 0 warnings

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composite iterator_adaptor
by Olaf Peter 07 Aug '10

07 Aug '10

Hello, the snippet below doesn't compile due to a missing constructor. Changes to const std::string doesn't compile too. Is this intentionally or misuse it? How to fix it? Here the error from from clang: /opt/clang/bin/clang++ -I /home/olaf/Projects/programming/cpp/boost/trunk/ iterator_composite.cpp -o iterator_composite iterator_composite.cpp:70:36: error: no matching constructor for initialization of 'client::default_input_iterator' (aka 'boost::filter_iterator<detail::equal_to<typename basic_iterator_type::value_type>, basic_iterator_type>') client::default_input_iterator first( rng.begin() ); ^ ~~~~~~~~~~~ Thanks, Olaf

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[serialization] Undefined reference to archive_serializer_map when creating my own archive type
by Maxime van Noppen 07 Aug '10

07 Aug '10

Hi, I'm trying to create my own archive type and I'm struggling with this error message : > $ g++ test.cc -lboost_serialization > /tmp/cc5aW7rV.o: In function `boost::archive::detail::pointer_oserializer<sql_oarchive, internal::unit>::pointer_oserializer()': > test.cc:(.text._ZN5boost7archive6detail19pointer_oserializerI12sql_oarchiveN8internal4unitEEC2Ev[_ZN5boost7archive6detail19pointer_oserializerI12sql_oarchiveN8internal4unitEEC5Ev]+0x4f): undefined reference to `boost::archive::detail::archive_serializer_map<sql_oarchive>::insert(boost::archive::detail::basic_serializer const*)' > /tmp/cc5aW7rV.o: In function `boost::archive::detail::pointer_oserializer<sql_oarchive, internal::unit>::~pointer_oserializer()': > test.cc:(.text._ZN5boost7archive6detail19pointer_oserializerI12sql_oarchiveN8internal4unitEED2Ev[_ZN5boost7archive6detail19pointer_oserializerI12sql_oarchiveN8internal4unitEED5Ev]+0x24): undefined reference to `boost::archive::detail::archive_serializer_map<sql_oarchive>::erase(boost::archive::detail::basic_serializer const*)' I can't find the relevant part of the documentation which talks about it. Adding this piece of code makes the code compile but it doesn't work: > namespace boost { namespace archive { namespace detail { > template <> > bool archive_serializer_map<sql_oarchive>::insert(boost::archive::detail::basic_serializer const*) > { > // ?? > } > > template <> > void archive_serializer_map<sql_oarchive>::erase(boost::archive::detail::basic_serializer const*) > { > // ?? > } > } } } I'm using boost 1.43 on g++ 4.5 on linux 64bits. The code is attached. What am I missing ? Thanks, -- Maxime

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