c++ - Fusion vector projection -


i have fusion vector elements have several member data of different types , create new fusion vector(s) project specific data member(s). i've been looking time no progress.

#include <iostream> #include <string> #include <boost/fusion/adapted/boost_tuple.hpp> #include <boost/fusion/include/fold.hpp> #include <boost/fusion/include/sequence.hpp> #include <boost/fusion/algorithm.hpp> #include <boost/spirit/include/phoenix.hpp> #include <boost/fusion/include/make_vector.hpp> #include <boost/bind.hpp>  namespace phx    = boost::phoenix; namespace fusion = boost::fusion; using namespace phx::arg_names;  struct mprint {     template<typename t>     void operator()(t& t) const     {         std::cout << t << std::endl;     } };  struct tstruct {     std::string val1_;     double      val2_;     int         val3_;     bool        val4_;     tstruct( const std::string &val1, double val2, int val3, bool val4 ) :         val1_(val1), val2_(val2), val3_(val3), val4_(val4) { } };  template <typename sequence> void viewval1( const std::string &dummy,const sequence& args ) {     fusion::for_each( boost::tie(phx::bind(&tstruct::val1_, arg1)(args)), mprint() ); }  template <typename sequence> void viewval2( const std::string &dummy,const sequence& args ) {     //fusion::for_each( boost::tie(phx::bind(&tstruct::val2_, arg1)(args)), mprint() ); }  int main( int argc, char* argv[] ) {     auto mdata = fusion::make_vector(             tstruct( "test1", 2.3, 1, true ),             tstruct( "test2", 3.3, 2, false ),             tstruct( "test3", 4.3, 3, true )     );      viewval1( "dummy", mdata );     viewval2( "dummy", mdata );      return 0; }

i think (meaning i'm not sure) need use fusion::transform_view:

running on coliru:

#include <iostream> #include <string> #include <boost/fusion/adapted/boost_tuple.hpp> #include <boost/fusion/include/fold.hpp> #include <boost/fusion/include/sequence.hpp> #include <boost/fusion/algorithm.hpp> #include <boost/spirit/include/phoenix.hpp> #include <boost/fusion/include/make_vector.hpp> #include <boost/bind.hpp>  namespace phx    = boost::phoenix; namespace fusion = boost::fusion; using namespace phx::arg_names;  struct mprint {     template<typename t>     void operator()(const t& t) const     {         std::cout << t << std::endl;     } };  struct get_val1 {     template <typename t>     std::string operator()(const t& t) const     {         return t.val1_;     } };  struct tstruct {     std::string val1_;     double      val2_;     int         val3_;     bool        val4_;     tstruct( const std::string &val1, double val2, int val3, bool val4 ) :         val1_(val1), val2_(val2), val3_(val3), val4_(val4) { } };  template <typename sequence> void viewval1( const std::string &dummy, sequence& args ) {     typedef fusion::transform_view<sequence, get_val1> project;     fusion::for_each(project(args,get_val1()), mprint() ); }  template <typename sequence> void viewval2( const std::string &dummy, sequence& args ) {     typedef fusion::transform_view<sequence,decltype(phx::bind(&tstruct::val2_,arg1))> project;     fusion::for_each( project(args,phx::bind(&tstruct::val2_, arg1)), mprint() ); }  int main( int argc, char* argv[] ) {     auto mdata = fusion::make_vector(             tstruct( "test1", 2.3, 1, true ),             tstruct( "test2", 3.3, 2, false ),             tstruct( "test3", 4.3, 3, true )     );      viewval1( "dummy", mdata );     viewval2( "dummy", mdata );      return 0; }

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