bind( &result_type::value, actor<LambdaExp>(at_c<0>(f_expr))( // Question: what goes here? to apply the subexpr. bind( &quantity<UnitIntegrandDomain>::from_value, arg_names::arg1 ) ) // end here );
What are the args to LambdaExp?
f_expr can be any phoenix expression taking one argument the integration variable, and returning a quantity. the object of LambdaExp type can be any phoenix subexpression of f_expr, typically should represent another function that takes one argument the integration variable (e.g. quantity) and returns another quantity to give you an example: if f_expr was "(boost::phoenix::arg_names::_1 * 0.2 )/ (boost::phoenix::arg_names::_1-wp)" (wp is a constant) the type of LambdaExp is composite<multiplies_eval, vector<argument<0>, value<double> > if f_expr was "(boost::phoenix::arg_names::_1)/ (boost::phoenix::arg_names::_1-wp)" then the type LambdaExp is argument<0> fi f_expr was "wp/(boost::phoenix::arg_names::_1-wp)" then the type LambdaExp is value<boost::units::quantity<...> > note that LambdaExp is the numerator in the fraction. the question is how to apply whatever is represented by at_c<0>(f_expr) to another phoenix expression. Thank you, Alfredo