QtCore

QtCore is a fundamental module within the Qt application framework. It provides a wide array of non-GUI core functionalities that are essential for developing applications using Qt. This module serves as the foundation upon which other Qt modules, such as QtGui and QtWidgets, are built.

Key features of QtCore include classes for handling strings, collections, memory management, and file I/O. It offers powerful data structures like lists, maps, and sets, as well as utility classes for working with dates, times, and regular expressions. The module also implements Qt's signal and slot mechanism, a core component for inter-object communication and event handling.

Furthermore, QtCore includes classes for threading and concurrency, enabling developers to create responsive and efficient applications by leveraging multi-core processors. It also provides support for internationalization and localization, allowing applications to be adapted for different languages and regions. The module's abstract base classes and utilities are designed to be platform-independent, promoting code reusability and portability across various operating systems. In essence, QtCore provides the building blocks for robust and scalable Qt applications, regardless of their graphical interface.