How can I serialize std::maps in my Qt-based GUI?

Serialization in Qt

In a Qt-based GUI, you may encounter situations where you need to serialize complex data structures like std::maps. While the Qt library does not directly provide built-in support for serializing std::maps, it offers features that enable you to implement your own serialization solution.

A key tool in Qt for serialization is QDataStream. This stream-based class can handle a range of C and Qt data types, allowing you to read and write data from and to various sources. To serialize a custom type like "MyType" which contains different kinds of fields, you can define a custom data type that interacts with QDataStream by overloading the "<<" and ">>" operators.

For instance, consider the following custom "Painting" data type:

class Painting {
public:
    ...  // Fields and methods

private:

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