How to convert a string of doubles into a vector

gistfile1.cpp

#include <iostream>
#include <vector>
#include <string>
#include <sstream>

template <class Facet>
struct erasable_facet : Facet
{
    erasable_facet() : Facet(0) { }
    ~erasable_facet() { }
};

std::vector<double> convert(const std::string& str)
{
    using num_get = std::num_get<char>;
    
    erasable_facet<num_get> facet;
    std::vector<double> v;
    std::stringbuf buf(str);
    
    std::ios ios(nullptr);
    std::ios_base::iostate err = std::ios_base::goodbit;
    
    double d;
    std::istreambuf_iterator<char> it;
    
    do
    {
        it = facet.get(&buf, std::istreambuf_iterator<char>(), ios, err, d);
        buf.sbumpc();
        v.push_back(d);
    } while (it != std::istreambuf_iterator<char>());
    
    return v;
}

int main()
{
    std::string str = "1.24 5.32\n 9.53";
    
    auto v = convert(str);
}