Hi there, I'm trying to multiply a factor to my probabilities by using the std::transform algorithm. But it results in a compiler error. #include <boost/spirit/include/phoenix_algorithm.hpp> #include <boost/spirit/include/phoenix_bind.hpp> #include <boost/spirit/include/phoenix_container.hpp> #include <boost/spirit/include/phoenix_core.hpp> #include <boost/spirit/include/phoenix_function.hpp> #include <boost/spirit/include/phoenix_fusion.hpp> #include <boost/spirit/include/phoenix_object.hpp> #include <boost/spirit/include/phoenix_operator.hpp> #include <boost/spirit/include/phoenix_scope.hpp> #include <boost/spirit/include/phoenix_statement.hpp> #include <boost/spirit/include/phoenix_stl.hpp> #include <algorithm> #include <iostream> #include <fstream> #include <vector> struct point { double _prob; double _x; }; int _tmain(int argc, _TCHAR* argv[]) { using namespace std; using namespace boost::phoenix; using namespace boost::phoenix::arg_names; vector< int > ints; // works std::transform( ints.begin() , ints.end() , ints.begin() , arg1 + 1 ); vector< point > points; // doesn't work std::transform( points.begin() , points.end() , points.begin() , bind( &point::_prob, arg1 ) * val( 2.0 ) ); return 0; } The error is: error C2679: binary '=' : no operator found which takes a right-hand operand of type 'double' (or there is no acceptable conversion) Regards, Christian