Serialization in Qt

When using the Qt library for GUI programming, you may encounter the need to serialize a large standard library map situation. "MyType" is a class with fields of different types. What features does Qt provide to enable serialization of mappings?

Using QDataStream for serialization

QDataStream can handle various C and Qt data types, including STL containers. A detailed list of supported data types can be found in the Qt documentation. In order to achieve serialization of custom types, we need to overload the > operators. The following is a custom data type definition that can be used with QDataStream:

class Painting
{
public:
    // ...
};

QDataStream &operator>(QDataStream &in, Painting &painting);

By overloading the

QDataStream &operator
By overloading the >> operator, we can read custom data from the stream: 
QDataStream &operator>>(QDataStream &in, Painting &painting)
{
    // ...
    return in;
}
 By overloading these operators, we can use custom types seamlessly with QDataStream to achieve serialization and deserialization of maps.