Parsing simple csv table with boost-spirit

I was trying to use boost-spirit to parse a fairly simple cvs file format.

My csv file looks like this:

Test.txt

2
5. 3. 2.
6. 3. 6.

The first integer represents the number of lines to read and each line consists of exactly three double values.

This is what I got so far.

main.cpp

#include <vector>
#include <fstream>
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix_core.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix_stl.hpp>
#include <boost/phoenix/object/construct.hpp>

std::vector<std::vector<double>> parseFile(std::string& content)
{
    std::vector<std::vector<double>> ret;
    using namespace boost::phoenix;
    using namespace boost::spirit::qi;
    using ascii::space;

    int no;
    phrase_parse(content.begin(), content.end(),
        int_[ref(no) = _1] >> repeat(ref(no))[(double_ >> double_ >> double_)[
            std::cout << _1 << _2 << _3
        ]], space
    );
    return ret;
}

int main(int arg, char **args) {
    auto ifs = std::ifstream("Test.txt");
    std::string content((std::istreambuf_iterator<char>(ifs)), (std::istreambuf_iterator<char>()));
    parseFile(content);
}

Now instead of the line std::cout << _1 << _2 << _3 I'm need of something that appends a std::vector<double> containing the three values.

I already tried _val=construct<std::vector<double>>({_1,_2,_3}), but it is not working. So what I'm doing wrong?