- Boost-users - lists.boost.org

[proto] : Recursive functions in a lambda like language
by Manjunath Kudlur 03 Jul '10

03 Jul '10

I was playing with the idea of having the user declare functions (polymorphic, possibly recursive) in a lambda like language, and the capability to later call that function with different types of arguments. Here is an example of what I am thinking about. function fib = if_(_1<2) [ _1 ].else_[fib(_1-1) + (_1-2)]; int x = fib.eval(10); How should I define the "function" class? My first attempt at a solution was to use "boost::any" like class for function, I overloaded operator() in that class so that it returns a proto expression. I am attaching some source code that has a function class and a phoenix like language. Now, I am not able to come up with a solution for defining a polymorphic eval() for the function class. Since "function" has to be able to store any type inside it, it has to do type erasure. All methods in "function" has to be delegated to value_base class but that cannot delegate a polymorphic eval() function down to value_type. I can templatize "function" class and get monomorphic functions defined in this language. But that is less interesting. I would greatly appreciate any advice and suggestions on other solutions to this problem. I realize that this is not entirely proto specific and maybe it is a general C++ language question, but I am hoping proto users might have faced similar problems and provide guidance. Thanks, Manjunath

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Re: [Boost-users] compiling fboost for x64
by Damien Hocking 03 Jul '10

03 Jul '10

The various command prompts are in "Visual Studio Tools" under your compiler in the Start menu. The --layout=system option gives you libs and dlls with no boost version or compiler version in the filenames. Damien On 03/07/2010 12:05 AM, Sean Farrow wrote: > > Ok, How do I get to a vs 64-bit command prompt, and what is the > layout=system. > > Thanks for everything. > > Sean. > > *From:* boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] *On Behalf Of *Damien Hocking > *Sent:* 03 July 2010 06:52 > *To:* boost-users(a)lists.boost.org > *Subject:* Re: [Boost-users] compiling fboost for x64 > > On what platform? Here's what I use for Windows: > > bjam.exe --toolset=msvc address-model=64 --stagedir=./stage64release > --build-dir=./build64release --layout=system --without-mpi > variant=release link=shared threading=multi runtime-link=shared > install --prefix=./win64release/indep --exec-prefix=./win64release/bin > --libdir=./win64release/lib --includedir=./win64release/include > bjam.exe --toolset=msvc address-model=64 --stagedir=./stage64debug > --build-dir=./build64debug --layout=system --without-mpi variant=debug > link=shared threading=multi runtime-link=shared install > --prefix=./win64debug/indep --exec-prefix=./win64debug/bin > --libdir=./win64debug/lib --includedir=./win64debug/include > > Note that "address-model=64" doesn't have a "--" prefix. This bites > lots of people (including me...) You need to run these in a Visual > Studio 64-bit command prompt. It's similar for Linux, --toolset=gcc > and from memory OSX is --toolset=darwin. > > Damien > > On 02/07/2010 11:33 PM, Sean Farrow wrote: > > Hi: > > I am currently in the process of writing an application that uses > boost that needs to be compilable under x64. Do I have to recompile > boost using bjam, if so how do I do this for x64 platforms? > > Cheers > > Sean. > > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org <mailto:Boost-users@lists.boost.org> > http://lists.boost.org/mailman/listinfo.cgi/boost-users > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users

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Re: [Boost-users] compiling fboost for x64
by Damien Hocking 03 Jul '10

03 Jul '10

On what platform? Here's what I use for Windows: bjam.exe --toolset=msvc address-model=64 --stagedir=./stage64release --build-dir=./build64release --layout=system --without-mpi variant=release link=shared threading=multi runtime-link=shared install --prefix=./win64release/indep --exec-prefix=./win64release/bin --libdir=./win64release/lib --includedir=./win64release/include bjam.exe --toolset=msvc address-model=64 --stagedir=./stage64debug --build-dir=./build64debug --layout=system --without-mpi variant=debug link=shared threading=multi runtime-link=shared install --prefix=./win64debug/indep --exec-prefix=./win64debug/bin --libdir=./win64debug/lib --includedir=./win64debug/include Note that "address-model=64" doesn't have a "--" prefix. This bites lots of people (including me...) You need to run these in a Visual Studio 64-bit command prompt. It's similar for Linux, --toolset=gcc and from memory OSX is --toolset=darwin. Damien On 02/07/2010 11:33 PM, Sean Farrow wrote: > > Hi: > > I am currently in the process of writing an application that uses > boost that needs to be compilable under x64. Do I have to recompile > boost using bjam, if so how do I do this for x64 platforms? > > Cheers > > Sean. > > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users

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compiling fboost for x64
by Sean Farrow 03 Jul '10

03 Jul '10

Hi: I am currently in the process of writing an application that uses boost that needs to be compilable under x64. Do I have to recompile boost using bjam, if so how do I do this for x64 platforms? Cheers Sean.

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Re: [Boost-users] compiling parallel boost graph library (PBGL)
by Nick Edmonds 02 Jul '10

02 Jul '10

> Dear PBGL developers, > > I'm getting errors when compiling parallel-bgl-0.7.0 (the release from PBGL website). > > I'm compiling against boost 1.43.0, MPI implementation by MX > (mpich/mx/gcc/64/1.2.7..3) and using gcc version 3.4.6 20060404 (Red Hat 3.4.6-11). > > The error I'm getting is: > ---- > boost/graph/distributed/betweenness_centrality.hpp:574: error: using invalid field `boost::graph::parallel::detail::betweenness_centrality_delta_stepping_impl > <Graph, DistanceMap, IncomingMap, EdgeWeightMap, PathCountMap>::owner' > ---- > and apparently happens during linking. > > I would appreciate your help. I put the printout from 'make' > (verbosity on so that you can see the failing command) and my CMakeCache > temporarily under: > > http://www.cs.vu.nl/~ekr/pbgl-error/error.txt > http://www.cs.vu.nl/~ekr/pbgl-error/CMakeCache.txt > > Best regards, > > Elzbieta Krepska Hi Elzbieta, It looks like the issue is that extracting the vertex_property_type of a filtered graph where the base graph is a CSR graph using bundled properties the vertex_property_type isn't propagated properly. The SSCA code is trying to declare an explicit property_map type for the vertex_owner and vertex_local maps. I can think of several ways to get around this, the simplest is probably to play some dispatching game to get the compiler to generate the types for me. If that didn't work I'd probably have to take a closer look at the filtered_graph and distributed CSR code. Do you actually need the SSCA code for anything? As a benchmark it's pretty much dead. The failure of this test doesn't affect the rest of the library. It should only be an issue if you want to run betweenness centrality on filtered graphs. I'll add the fact that betweenness centrality doesn't work with filtered graphs in 0.7.0 to my list of bugs, but I'm in the middle of a big rewrite of the library at the moment. Let me know if this is a blocking issue for you and I'll try to carve out some free time to address it in the near term. The version of SSCA/Betweenness Centrality in the boost repository should have already addressed this issue as well so it may be worth trying or looking at to see what the fix is. Cheers, Nick

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matrix covariance / eigenvalues / -vectors
by Kraus Philipp 02 Jul '10

02 Jul '10

Hi, I try to build a covariance matrix. I have installed and linked LAPACK and ATLAS with boost and use the boost numerical bindings. For the covariance I need a matrix command like cov on http://www.mathworks.com/access/helpdesk/help/techdoc/ref/cov.html I don't find an example in the boost documentation. Is there a command for matrix data? Is there any documentation with example for using LAPACK and boost? I have only found http://mathema.tician.de/node/391 but I can understand it better with examples Thanks for help Phil

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boost MPI error MPI_ERR_TRUNCATE
by Jack Bryan 02 Jul '10

02 Jul '10

Dear All: With boost MPI, I trying to ask some worker nodes to send some message to the single master node. I am using OpenMPI 1.3.4. I use an array recvArray[row][column] to receive the message, which is a C++ class that contain int, member functions. But I got an error of terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::mpi::exception> >' what(): MPI_Test: MPI_ERR_TRUNCATE: message truncated[n124:126639] *** Process received signal ***[n124:126639] Signal: Aborted (6)[n124:126639] Signal code: (-6) It seems that the master cannot find enough space for the receicved message. But, I have decleared the recvArray<calssPackage> , which is a vector with element as my received class package. The error is very wierd. When I open the recvied package, the elements are not expected numbers buy only some very large or small numbers. Any help is appreciated. Jack July 2 2010 _________________________________________________________________ The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail. http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28…

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[concept_check] Restricting to floating point arguments
by Ruediger Berlich 02 Jul '10

02 Jul '10

Hi there, I need to make sure that a given template class is only instantiated with integer types, and another one only with the likes of float or double. I have played with boost::concept_check and was wondering, why it is possible to say BOOST_CONCEPT_ASSERT((Integer<T>)); while there is no predefined BOOST_CONCEPT_ASSERT((FloatingPoint<T>)); The simple code below seems to do its job, so there must be some trade-off which I do not see ? /*************************************************************************/ #include <iostream> #include <boost/cstdint.hpp> #include <boost/concept_check.hpp> #include <boost/concept/usage.hpp> #include <boost/concept/detail/concept_def.hpp> /*****************************************************************/ namespace boost { BOOST_concept(FloatingPoint, (T)) { BOOST_CONCEPT_USAGE(FloatingPoint) { x.error_type_must_be_a_floating_point_type(); } private: T x; }; template <> struct FloatingPoint<long double> {}; template <> struct FloatingPoint<double> {}; template <> struct FloatingPoint<float> {}; } /*****************************************************************/ template <class T> class integerWrapper { BOOST_CONCEPT_ASSERT((boost::Integer<T>)); public: integerWrapper() { /* nothing */ } }; /*****************************************************************/ template <class T> class fpWrapper { BOOST_CONCEPT_ASSERT((boost::FloatingPoint<T>)); public: fpWrapper() { /* nothing */ } }; /*****************************************************************/ main() { integerWrapper<boost::int32_t> iW; fpWrapper<double> fW_double; // o.k. fpWrapper<float> fW_float; // o.k. // fpWrapper<char> fW_char; // fails to compile. Good. // fpWrapper<boost::int32_t> fW_int32; // fails to compile. Good } /*************************************************************************/ Best Regards, Ruediger

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[Serialization] Serializing a vector of pointers
by Dante Stroe 02 Jul '10

02 Jul '10

Hello, I am trying to serialize a vector of pointers (Below you have a piece of dummy code that reproduces the error) but I get compilation errors. As I understood from the tutorial this should pretty much work out of the box. Am I missing something? I am using gcc 4.1 and the 1.43 version of the boost library. Thanks a lot, Dante Test program: #include<cstddef> #include<iomanip> #include<iostream> #include<fstream> #include<vector> #include<boost/archive/tmpdir.hpp> #include<boost/archive/text_iarchive.hpp> #include<boost/archive/text_oarchive.hpp> #include<boost/serialization/vector.hpp> #include<boost/serialization/utility.hpp> class test { friend class boost::serialization::access; std::vector<double*> r; // = std::vector<double*>(n); template<class Archive> void serialize(Archive& ar, const unsigned int /*file_version*/){ ar& r; } public: test(){}; }; void save_test(const test&s, const char * filename){ // make an archive std::ofstream ofs(filename); boost::archive::text_oarchive oa(ofs); oa<< s; } void restore_test(test&s, const char * filename) { // open the archive std::ifstream ifs(filename); boost::archive::text_iarchive ia(ifs); // restore the schedule from the archive ia>> s; } int main() { return 0; } Compilation errors: /home/dante/pagmo/examples/demo_serialization.cpp: In instantiation of ‘void test::serialize(Archive&, unsigned int) [with Archive = boost::archive::text_iarchive]’: /home/dante/pagmo/external_headers/boost/serialization/access.hpp:118: instantiated from ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = test]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = test]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = test]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:182: instantiated from ‘void boost::archive::detail::iserializer<Archive, T>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const [with Archive = boost::archive::text_iarchive, T = test]’ /home/dante/pagmo/examples/demo_serialization.cpp:48: instantiated from here /home/dante/pagmo/examples/demo_serialization.cpp:20: warning: unused parameter ‘file_version’ /home/dante/pagmo/examples/demo_serialization.cpp: In instantiation of ‘void test::serialize(Archive&, unsigned int) [with Archive = boost::archive::text_oarchive]’: /home/dante/pagmo/external_headers/boost/serialization/access.hpp:118: instantiated from ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = test]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = test]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = test]’ /home/dante/pagmo/external_headers/boost/archive/detail/oserializer.hpp:148: instantiated from ‘void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::text_oarchive, T = test]’ /home/dante/pagmo/examples/demo_serialization.cpp:48: instantiated from here /home/dante/pagmo/examples/demo_serialization.cpp:20: warning: unused parameter ‘file_version’ In file included from /home/dante/pagmo/external_headers/boost/serialization/static_warning.hpp:73, from /home/dante/pagmo/external_headers/boost/serialization/extended_type_info_typeid.hpp:27, from /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:47, from /home/dante/pagmo/external_headers/boost/archive/detail/interface_iarchive.hpp:22, from /home/dante/pagmo/external_headers/boost/archive/detail/common_iarchive.hpp:23, from /home/dante/pagmo/external_headers/boost/archive/basic_text_iarchive.hpp:31, from /home/dante/pagmo/external_headers/boost/archive/text_iarchive.hpp:24, from /home/dante/pagmo/examples/demo_serialization.cpp:10: /home/dante/pagmo/external_headers/boost/mpl/print.hpp: In instantiation of ‘boost::mpl::print<boost::serialization::BOOST_SERIALIZATION_STATIC_WARNING_LINE<148> >’: /home/dante/pagmo/external_headers/boost/serialization/static_warning.hpp:92: instantiated from ‘boost::serialization::static_warning_test<false, 148>’ /home/dante/pagmo/external_headers/boost/archive/detail/check.hpp:148: instantiated from ‘void boost::archive::detail::check_pointer_tracking() [with T = double]’ /home/dante/pagmo/external_headers/boost/archive/detail/oserializer.hpp:454: instantiated from ‘static void boost::archive::detail::save_pointer_type<Archive>::save(Archive&, const T&) [with T = double, Archive = boost::archive::text_oarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/oserializer.hpp:473: instantiated from ‘static void boost::archive::detail::save_pointer_type<Archive>::invoke(Archive&, TPtr) [with TPtr = double*, Archive = boost::archive::text_oarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/oserializer.hpp:525: instantiated from ‘void boost::archive::save(Archive&, T&) [with Archive = boost::archive::text_oarchive, T = double* const]’ /home/dante/pagmo/external_headers/boost/archive/detail/common_oarchive.hpp:69: instantiated from ‘void boost::archive::detail::common_oarchive<Archive>::save_override(T&, int) [with T = double* const, Archive = boost::archive::text_oarchive]’ /home/dante/pagmo/external_headers/boost/archive/basic_text_oarchive.hpp:80: instantiated from ‘void boost::archive::basic_text_oarchive<Archive>::save_override(T&, int) [with T = double* const, Archive = boost::archive::text_oarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/interface_oarchive.hpp:63: instantiated from ‘Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = double* const, Archive = boost::archive::text_oarchive]’ /home/dante/pagmo/external_headers/boost/serialization/nvp.hpp:79: instantiated from ‘void boost::serialization::nvp<T>::save(Archivex&, unsigned int) const [with Archivex = boost::archive::text_oarchive, T = double* const]’ /home/dante/pagmo/external_headers/boost/serialization/access.hpp:93: instantiated from ‘static void boost::serialization::access::member_save(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = const boost::serialization::nvp<double* const>]’ /home/dante/pagmo/external_headers/boost/serialization/split_member.hpp:43: instantiated from ‘static void boost::serialization::detail::member_saver<Archive, T>::invoke(Archive&, const T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = boost::serialization::nvp<double* const>]’ /home/dante/pagmo/external_headers/boost/serialization/split_member.hpp:69: instantiated from ‘void boost::serialization::split_member(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = boost::serialization::nvp<double* const>]’ /home/dante/pagmo/external_headers/boost/serialization/nvp.hpp:89: instantiated from ‘void boost::serialization::nvp<T>::serialize(Archive&, unsigned int) [with Archive = boost::archive::text_oarchive, T = double* const]’ /home/dante/pagmo/external_headers/boost/serialization/access.hpp:118: instantiated from ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = boost::serialization::nvp<double* const>]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = boost::serialization::nvp<double* const>]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = boost::serialization::nvp<double* const>]’ /home/dante/pagmo/external_headers/boost/archive/detail/oserializer.hpp:241: instantiated from ‘static void boost::archive::detail::save_non_pointer_type<Archive>::save_only::invoke(Archive&, const T&) [with T = boost::serialization::nvp<double* const>, Archive = boost::archive::text_oarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/oserializer.hpp:308: instantiated from ‘static void boost::archive::detail::save_non_pointer_type<Archive>::invoke(Archive&, const T&) [with T = boost::serialization::nvp<double* const>, Archive = boost::archive::text_oarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/oserializer.hpp:525: instantiated from ‘void boost::archive::save(Archive&, T&) [with Archive = boost::archive::text_oarchive, T = const boost::serialization::nvp<double* const>]’ /home/dante/pagmo/external_headers/boost/archive/detail/common_oarchive.hpp:69: instantiated from ‘void boost::archive::detail::common_oarchive<Archive>::save_override(T&, int) [with T = const boost::serialization::nvp<double* const>, Archive = boost::archive::text_oarchive]’ /home/dante/pagmo/external_headers/boost/archive/basic_text_oarchive.hpp:80: instantiated from ‘void boost::archive::basic_text_oarchive<Archive>::save_override(T&, int) [with T = const boost::serialization::nvp<double* const>, Archive = boost::archive::text_oarchive]’ /home/dante/pagmo/external_headers/boost/archive/detail/interface_oarchive.hpp:63: instantiated from ‘Archive& boost::archive::detail::interface_oarchive<Archive>::operator<<(T&) [with T = const boost::serialization::nvp<double* const>, Archive = boost::archive::text_oarchive]’ /home/dante/pagmo/external_headers/boost/serialization/collections_save_imp.hpp:60: instantiated from ‘void boost::serialization::stl::save_collection(Archive&, const Container&) [with Archive = boost::archive::text_oarchive, Container = std::vector<double*, std::allocator<double*> >]’ /home/dante/pagmo/external_headers/boost/serialization/vector.hpp:53: instantiated from ‘void boost::serialization::save(Archive&, const std::vector<U, Allocator>&, unsigned int, mpl_::false_) [with Archive = boost::archive::text_oarchive, U = double*, Allocator = std::allocator<double*>]’ /home/dante/pagmo/external_headers/boost/serialization/vector.hpp:120: instantiated from ‘void boost::serialization::save(Archive&, const std::vector<U, Allocator>&, unsigned int) [with Archive = boost::archive::text_oarchive, U = double*, Allocator = std::allocator<double*>]’ /home/dante/pagmo/external_headers/boost/serialization/split_free.hpp:45: instantiated from ‘static void boost::serialization::free_saver<Archive, T>::invoke(Archive&, const T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = std::vector<double*, std::allocator<double*> >]’ /home/dante/pagmo/external_headers/boost/serialization/split_free.hpp:74: instantiated from ‘void boost::serialization::split_free(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = std::vector<double*, std::allocator<double*> >]’ /home/dante/pagmo/external_headers/boost/serialization/vector.hpp:151: instantiated from ‘void boost::serialization::serialize(Archive&, std::vector<U, Allocator>&, unsigned int) [with Archive = boost::archive::text_oarchive, U = double*, Allocator = std::allocator<double*>]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = std::vector<double*, std::allocator<double*> >]’ /home/dante/pagmo/external_headers/boost/archive/detail/oserializer.hpp:148: instantiated from ‘void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::text_oarchive, T = std::vector<double*, std::allocator<double*> >]’ /home/dante/pagmo/examples/demo_serialization.cpp:48: instantiated from here /home/dante/pagmo/external_headers/boost/mpl/print.hpp:55: warning: comparison between signed and unsigned integer expressions In file included from /home/dante/pagmo/external_headers/boost/serialization/extended_type_info_typeid.hpp:36, from /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:47, from /home/dante/pagmo/external_headers/boost/archive/detail/interface_iarchive.hpp:22, from /home/dante/pagmo/external_headers/boost/archive/detail/common_iarchive.hpp:23, from /home/dante/pagmo/external_headers/boost/archive/basic_text_iarchive.hpp:31, from /home/dante/pagmo/external_headers/boost/archive/text_iarchive.hpp:24, from /home/dante/pagmo/examples/demo_serialization.cpp:10: /home/dante/pagmo/external_headers/boost/serialization/access.hpp: In static member function ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = double]’: /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = double]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_iarchive, T = double]’ /home/dante/pagmo/external_headers/boost/archive/detail/iserializer.hpp:182: instantiated from ‘void boost::archive::detail::iserializer<Archive, T>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const [with Archive = boost::archive::text_iarchive, T = double]’ /home/dante/pagmo/examples/demo_serialization.cpp:48: instantiated from here /home/dante/pagmo/external_headers/boost/serialization/access.hpp:118: error: request for member ‘serialize’ in ‘t’, which is of non-class type ‘double’ /home/dante/pagmo/external_headers/boost/serialization/access.hpp: In static member function ‘static void boost::serialization::access::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = double]’: /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:74: instantiated from ‘void boost::serialization::serialize(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = double]’ /home/dante/pagmo/external_headers/boost/serialization/serialization.hpp:133: instantiated from ‘void boost::serialization::serialize_adl(Archive&, T&, unsigned int) [with Archive = boost::archive::text_oarchive, T = double]’ /home/dante/pagmo/external_headers/boost/archive/detail/oserializer.hpp:148: instantiated from ‘void boost::archive::detail::oserializer<Archive, T>::save_object_data(boost::archive::detail::basic_oarchive&, const void*) const [with Archive = boost::archive::text_oarchive, T = double]’ /home/dante/pagmo/examples/demo_serialization.cpp:48: instantiated from here /home/dante/pagmo/external_headers/boost/serialization/access.hpp:118: error: request for member ‘serialize’ in ‘t’, which is of non-class type ‘double’ make[2]: *** [examples/CMakeFiles/demo_serialization.dir/demo_serialization.o] Error 1 make[1]: *** [examples/CMakeFiles/demo_serialization.dir/all] Error 2 make: *** [all] Error 2

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Boost.MultiArray + Boost.Lambda woes
by anony 02 Jul '10

02 Jul '10

I have the following code: typedef boost::multi_array<float, 3> multi_array_typea; multi_array_typea hfa; multi_array_typea::extent_gen extentsa; hfa.resize(extentsa[a][b][c]); multi_array_typea::const_iterator p(std::max_element(hfa.begin(), hfa.end(), bll::bind(static_cast<float(*)(float)>(&std::abs), bll::_1))); Which fails to compile, interestingly: multi_array_typea::const_iterator p(std::max_element(hfa.begin(), hfa.end())); compiles ok. Can someone please come up with appropriate BLL magic to resolve this situation? It seems to me, I'd somehow have to dereference bll:_1.

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