Lettura files ifstream

#include <iostream>
#include "Node.h"

#include <fstream>

void write_binary()
{
    std::ofstream bin("tst.bi", std::ios::out|std::ios::binary);
    double v = 7;
    bin << v;
    bin.close();
}

void read_binary()
{
    std::ifstream bin("tst.bi", std::ios::in|std::ios::binary);
    double v;
    bin >> v;
    std::cout << v << std::endl;
}


std::ofstream& operator << (std::ofstream& out, const double& v)
{
    out << v;
    return out;
}

std::ifstream& operator >> (std::ifstream& in, double& v)
{
    in >> v;
    return in;
}

int main()
{
    //test_node();

    write_binary();
    read_binary();

    std::ofstream ofile("test.bi", std::ios::out|std::ios::binary);
    double v = 7;
    ofile << v;

    std::ifstream ifile("test.bi", std::ios::in|std::ios::binary);
    double iv;
    ifile >> iv;
    std::cout << iv << std::endl;

    std::cout << "Hello world!" << std::endl;
    return 0;
}