[eigen] What's the best way to copy an Eigen::Vector into a std::vector?

[Robert Lupton the Good <rhl@xxxxxxxxxxxxxxxxxxx>]

Dear Mr. Eigen,

What's the best way to copy an Eigen::Vector into a std::vector?

I'd use
	std::copy(evec.begin(), evec.end(), stdvec.begin());
if Eigen supported begin and and, but it doesn't seem to.  I don't  
know what Eigen's start() and end() are supposed to do, but the  
following doesn't compile:

#include <algorithm>
#include <vector>
#include "Eigen/Core"

int main() {
    Eigen::VectorXd evec(10);
    std::vector<double> stdvec(10);
    std::copy(evec.start(), evec.end(), stdvec.begin());
}

although the doxygen docs refer to start(void).

I see the headers Eigen/StdVec and Eigen/NewStdVec, but they don't  
seem to do what I want.

				R