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[type_erasure] static check of concept compliance
by Joaquin M López Muñoz 30 Aug '16

30 Aug '16

Consider: using any_t=any< boost::mpl::vector< copy_constructible<>, incrementable<> > >; struct foo{}; int main() { std::cout<<std::is_constructible<any_t,foo>::value<<"\n"; } This program outputs 1 as the ctor of boost::type_erasure::any<Concept> if not restricted to Concept-compliant args, but of course we can't use foo to construct any_t: any_t x{foo{}}; // compile error as foo is not incrementable Is there a (publicly available) way to determine if an argument of type U can be used to construct an any<Concept,T>? I'd like to have this for doing SFINAE in my any-using code. Thank you, Joaquín M López Muñoz

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Yet another issue with BGL Deserialization
by giacomo＠openmailbox.org 28 Aug '16

28 Aug '16

I'm trying to both serialize and deserialize the data in a graph format. The definition of my graph is the following one. #include <boost/graph/adjacency_list.hpp> #include <boost/graph/directed_graph.hpp> #include <boost/graph/adj_list_serialize.hpp> #include <boost/archive/binary_oarchive.hpp> #include <boost/archive/binary_iarchive.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/binary_object.hpp> class VFull { public: VFull(); unsigned int id, hash, year; std::string ip, organization; VFull(unsigned int id, unsigned int hash, unsigned int year, std::string ip, std::string organization); template<class Archive> void serialize(Archive & ar, const unsigned int version); }; class EFull { public: EFull(); template<class Archive> void serialize(Archive & ar, const unsigned int version); }; class GFull { public: template<class Archive> void serialize(Archive & ar, const unsigned int version); }; //Defining the graph data structure. Using the vecS specification typedef boost::adjacency_list<boost::vecS, boost::vecS, boost::directedS,VFull,EFull,GFull> graph_t; typedef boost::graph_traits<graph_t>::vertex_descriptor result_vertex_descriptor; typedef boost::graph_traits<graph_t>::edge_descriptor result_edge_descriptor; It seems to me that I have no problems in the serialization process, while I have some issues in the deserialization part. In fact, I have no linking errors until this piece of code is added to my source: #include <iomanip> #include <iostream> #include <fstream> { std::ifstream file(path,std::ios_base::binary); boost::archive::binary_iarchive store{file}; store >> graph; // Deserialization part that triggers the error } I tried to read some questions here and to read the Boost manual, but they didn't solve my problem. In particular, I have this error: Undefined symbols for architecture x86_64: "void EFull::serialize<boost::archive::binary_iarchive>(boost::archive::binary_iarchive&, unsigned int)", referenced from: void boost::serialization::access::serialize<boost::archive::binary_iarchive, EFull>(boost::archive::binary_iarchive&, EFull&, unsigned int) in boostOthers.cpp.o "void GFull::serialize<boost::archive::binary_iarchive>(boost::archive::binary_iarchive&, unsigned int)", referenced from: void boost::serialization::access::serialize<boost::archive::binary_iarchive, GFull>(boost::archive::binary_iarchive&, GFull&, unsigned int) in boostOthers.cpp.o "void VFull::serialize<boost::archive::binary_iarchive>(boost::archive::binary_iarchive&, unsigned int)", referenced from: void boost::serialization::access::serialize<boost::archive::binary_iarchive, VFull>(boost::archive::binary_iarchive&, VFull&, unsigned int) in boostOthers.cpp.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) By the way, I'm serializing and deserializing strings and unsigned ints, "native data types" that seems to be supported by boost: //VERTICES VFull::VFull() { } VFull::VFull(unsigned int i, unsigned int h, unsigned int y, std::string p, std::string o) : id{i}, hash{h}, year{y}, ip{p}, organization{o} { } template<class Archive> void VFull::serialize(Archive &ar, const unsigned int version) { ar & 'i'; ar & id; ar & 'h'; ar & hash; ar & '1'; ar & ip; ar & '2'; ar & organization; ar & '3'; ar & year; ar & '/'; } /////// //EDGES EFull::EFull() { } template<class Archive> void EFull::serialize(Archive &ar, const unsigned int version) { char waste = 'e'; ar & waste; } /////// //GRAPH SIGNATURE template<class Archive> void GFull::serialize(Archive &ar, const unsigned int version) { std::string waste = "GBLS"; ar & waste; } /////// Yes, I am linking my source code to both BGL and Boost's serialization. This is acheived through this part of CMake script: find_package( Boost REQUIRED COMPONENTS graph serialization ) set(Boost_USE_STATIC_LIBS ON) set(Boost_USE_MULTITHREADED OFF) INCLUDE_DIRECTORIES( ${Boost_INCLUDE_DIRS} ..some other stuff..) TARGET_LINK_LIBRARIES(mycode ${Boost_LIBRARIES})

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[Boost.Hana] how to merge two or more maps
by Matthijs Möhlmann 25 Aug '16

25 Aug '16

Hi, I am looking into the documentation of hana to merge two or more maps, say: #include <boost/hana.hpp> namespace hana = boost::hana; int main(int argc, char **argv) { constexpr auto m1 = hana::make_map( hana::make_pair("key1"_s, hana::type_c<std::string>), hana::make_pair("key2"_s, hana::type_c<std::string>) ); constexpr auto m2 = hana::make_map( hana::make_pair("key3"_s, hana::type_c<std::string>), hana::make_pair("key4"_s, hana::type_c<std::string>), hana::make_pair("key5"_s, hana::type_c<std::string>) ); // Merge two or more maps? constexpr auto result = m1 + m2; return 0; } I'm not sure how to do this, probably taking the first map and for every pair in the subsequent map return an insert? In pseudo code: constexpr result = hana::insert(hana::insert(m1, pair1), pair2); Can someone give me some pointers in the right direction? Regards, Matthijs

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Fw: Boost-users Digest, Vol 4543, Issue 1
by David Frank 24 Aug '16

24 Aug '16

Thanks Daniel. I go the following errors and some segmentation fault. Is there any additional option to set:? ...skipped <pstage/lib>libboost_wave.so.1.61.0 for lack of <pbin.v2/libs/wave/build/clang-linux-3.6.2/release/threading-multi>libboost_wave.so.1.61.0... ...skipped <pstage/lib>libboost_wave.so for lack of <pstage/lib>libboost_wave.so.1.61.0... ...failed updating 518 targets... ...skipped 170 targets... ...updated 432 targets... On Wednesday, August 24, 2016 12:40 PM, David Frank <david_frank56(a)yahoo.com> wrote: On Wednesday, August 24, 2016 12:00 PM, "boost-users-request(a)lists.boost.org" <boost-users-request(a)lists.boost.org> wrote: Send Boost-users mailing list submissions to boost-users(a)lists.boost.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.boost.org/mailman/listinfo.cgi/boost-users or, via email, send a message with subject or body 'help' to boost-users-request(a)lists.boost.org You can reach the person managing the list at boost-users-owner(a)lists.boost.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Boost-users digest..." Today's Topics: 1. compile boost and boost application with CLANG compiler (David Frank) 2. Re: compile boost and boost application with CLANG compiler (Daniel Hofmann) 3. [Boost.Hana] how to merge two or more maps (Matthijs M?hlmann) 4. [test] Init framework before dataset generation (Florian Lindner) ---------------------------------------------------------------------- Message: 1 Date: Tue, 23 Aug 2016 18:06:42 +0000 (UTC) From: David Frank <david_frank56(a)yahoo.com> To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> Subject: [Boost-users] compile boost and boost application with CLANG compiler Message-ID: <14791342.1048154.1471975602912(a)mail.yahoo.com> Content-Type: text/plain; charset="utf-8" Has anyone successfully compiled boost and application with boost with CLANG compiler?If yes, would you mind sharing the steps?

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compile boost and boost application with CLANG compiler
by David Frank 23 Aug '16

23 Aug '16

Has anyone successfully compiled boost and application with boost with CLANG compiler?If yes, would you mind sharing the steps?

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Boost Asio SSL can't receive without sending
by 刘焕杰 23 Aug '16

23 Aug '16

Hi, I am using Boost Asio to developed a server, with SSL support. I add async_read_some() function in handshake handler and send handler. Which receiving is OK if I send something to clients, but I can't keep receiving after I stop sending things to client. So I am wondering how can I keep receiving, I know there must be a way to make it, I am new to Asio, can someone help, thanks in advance. ------------------ I won't go

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[type_erasure] use of typeid_of with reference any
by Joaquin M López Muñoz 23 Aug '16

23 Aug '16

Boost.TypeErasure docs say template<typename Concept, typename T> const std::type_info & typeid_of(const any< Concept, T > & arg); [...] Requires: Concept includes typeid_<T>. T is a non-reference, CV-unqualified placeholder. which, if my literal reading is right, means that you can't use typeid_of on, say, any<typeid_<>,_self&>, yet the following compiles on GCC #include <boost/type_erasure/any.hpp> #include <boost/type_erasure/builtin.hpp> #include <boost/type_erasure/typeid_of.hpp> #include <iostream> using namespace boost::type_erasure; int main() { int x=0; any<boost::mpl::vector<typeid_<>,relaxed>,_self&> a=x; std::cout<<typeid_of(a).name()<<"\n"; } and correctly outputs the name of the "int" type. Is this a bug in the docs or am I missing something? Thank you, Joaquín M López Muñoz

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How to build Boost agianst specific version of openSSL
by ramonpadilla1＠yahoo.co.uk 22 Aug '16

22 Aug '16

My machine is a Mac with OS X El Capitan installed.Using Homebrew I have installed openssl 1.0.2h_1 but it does not allow it to be linked to usr/local.openssl version -a returns:OpenSSL 0.9.8zh 14 Jan 2016 built on: Feb 4 2016 platform: darwin64-x86_64-llvm options: bn(64,64) md2(int) rc4(ptr,char) des(idx,cisc,16,int) blowfish(idx) compiler: -arch x86_64 -fmessage-length=0 -pipe -Wno-trigraphs -fpascal-strings -fasm-blocks -O3 -D_REENTRANT -DDSO_DLFCN -DHAVE_DLFCN_H -DL_ENDIAN -DMD32_REG_T=int -DOPENSSL_NO_IDEA -DOPENSSL_PIC -DOPENSSL_THREADS -DZLIB -mmacosx-version-min=10.6 OPENSSLDIR: "/System/Library/OpenSSL"which openssl returns /usr/bin/openssl.I want to build Boost but I understand from the answer posted to this question that Boost will use the openssl version provided by the system.How do I force the boost build to use the version of openssl I have installed via Homebrew?

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Re: [Boost-users] Boost Asio SSL can't receive without sending
by 刘焕杰 22 Aug '16

22 Aug '16

Hi Radu, yes, I have called run() on the ioservice. And I still can't figure out why, do I need to keep sending things to client? Thanks for reply. ------------------ jenenliu ------------------ Original ------------------ From: "Radu Andrei Nedelcu";<radu(a)disruptive.engineering>; Date: Fri, Aug 19, 2016 11:35 PM To: "boost-users(a)lists.boost.org"<boost-users(a)lists.boost.org>; Subject: Re: [Boost-users] Boost Asio SSL can't receive without sending Are you calling run( ) on the ioservice ( boost::asio::io_service ) ? Radu From: Boost-users [mailto:boost-users-bounces@lists.boost.org] On Behalf Of ??? Sent: 19 August 2016 07:57 To: boost-users <boost-users(a)lists.boost.org> Subject: [Boost-users] Boost Asio SSL can't receive without sending Hi, I am using Boost Asio to developed a server, with SSL support. I add async_read_some() function in handshake handler and send handler. Which receiving is OK if I send something to clients, but I can't keep receiving after I stop sending things to client. So I am wondering how can I keep receiving, I know there must be a way to make it, I am new to Asio, can someone help, thanks in advance. ------------------ I won't go

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[math] Undefined reference to promote_args
by Florian Lindner 18 Aug '16

18 Aug '16

Hello, when compiling a file that uses float_distance from #include <boost/math/special_functions/relative_difference.hpp> I get a linking error: undefined reference to `boost::math::tools::promote_args<double, double, float, float, float, float>::type boost::math::float_distance<double, double>(double const&, double const&)' I try to add all boost_math libs I could find, but none helped: -lboost_system -lboost_filesystem -lboost_math_tr1 -lboost_math_c99 -lboost_math_c99 Since float_distance is not a C99 / TR1 function, should'nt boost.math work as header only? What is the problem here? Thanks, Florian

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