with boost.lambda I could extract the different components (Lambda and the actual value stored by value<double>) from f_expr as: get<0>(f_expr.args) //for lambda and get<1>(get<1>(f_expr.args).args) //for lambda
what is the equivalent for Boost.phoenix?,
Check out the extension mechanism (somewhere near the end) where this is documented. See composites. Essentially, while lambda uses tuples, phoenix uses fusion containers -- more or less the same, but with more horsepower (i.e. algorithms and iterators).
I read that part many times but I couldn't realize how to apply it to
this case.
I ended up calling
actor<LambdaExp>(at_c<0>(f_expr))
actor