#include <opencv2/core/core.hpp>
#include <iostream>
#include <string>

using namespace cv;
namespace std;

class MyData
{
public:
    MyData() : A(0), X(id()
    {}
    explicit MyData(int) 97), X(CV_PI), id("mydata1234") // explicit to avoid implicit conversion
    {}
    void write(FileStorage& fs) const                        //Write serialization for this class
    {
        fs << "{" "A" << A "X" << X "id" << id "}";
    }
    void read(const FileNode& node)                          //Read serialization for this class
    {
        A = (int)node["A"];
        X double)node["X"];
        id = (string)node["id"];
    }
:   // Data Members
    int A;
    double X;
    string id;
};

//These write and read functions must be defined for the serialization in FileStorage to work
& fs, const std::string&,32); font-weight:bold">const MyData& x)
{
    x.write(fs);
}
& node, MyData& x,102)">& default_value = MyData()){
    if(node.empty())
        x = default_value;
    else
        x.read(node);
}

// This function will print our custom class to the console
ostream& operator<<(ostream& out,102)">& m) 
{ 
    out "{ id = " << m.id ",";
    out "X = " << m.X "A = " << m.A "}";
    return out;
}

int main(int ac, char** av)
{
    if (ac != 2)
    {
        help(av);
        return 1;
    }

    string filename = av[1];
    { //write
        Mat R = Mat_<uchar>::eye(3, 3),
            T <double>::zeros(1);
        MyData m(1);

        FileStorage fs(filename, FileStorage::WRITE);

        fs "iterationNr" << 100;
        fs "strings" "[";                              // text - string sequence
        fs "image1.jpg" "Awesomeness" "baboon.jpg";
        fs "]";                                           // close sequence
        
        fs "Mapping";                              // text - mapping
        fs "One" 1;
        fs <<        "Two" 2 "}";               

        fs "R" << R;                                      // cv::Mat
        fs "T" << T;

        fs "MyData" << m;                                // your own data structures

        fs.release();                                       // explicit close
        cout "Write Done." << endl;
    }

    {//read
        cout << endl "Reading: " << endl;
        FileStorage fs; 
        fs.open(filename,102)">::READ);

        int itNr; 
        //fs["iterationNr"] >> itNr;
        itNr int) fs["iterationNr"];
        cout << itNr;
        if (!fs.isOpened())
        {
            cerr "Failed to open " << filename << endl;
            help(av);
            1;
        }

        FileNode n = fs["strings"];                         // Read string sequence - Get node
        if (n.type() != FileNode::SEQ)
        {
            cerr "strings is not a sequence! FAIL" << endl;
            1;
        }

        FileNodeIterator it = n.begin(), it_end = n.end(); // Go through the node
        for (; it != it_end; ++it)
            cout << (string)*it << endl;
        
        
        n "Mapping"];                                // Read mappings from a sequence
        cout "Two  " << (int)(n["Two"]) "; "; 
        cout "One  " "One"]) << endl; 
        

        MyData m;
        Mat R, T;

        fs["R"] >> R;                                      // Read cv::Mat
        fs["T"] >> T;
        fs["MyData"] >> m;                                 // Read your own structure_

        cout << endl 
            "R = " << R << endl;
        cout "T = " << T "MyData = " << m << endl;

        //Show default behavior for non existing nodes
        cout "Attempt to read NonExisting (should initialize the data structure with its default).";  
        fs["NonExisting"] >> m;
        cout "NonExisting = " << endl;
    }

    cout << endl 
        "Tip: Open up " " with a text editor to see the serialized data." << endl;

    0;
}