Qt Reference Pages

All Classes	If you know the name of the class you want, find it here.
All Classes by Module	A list of all C++ API components in Qt 5
All Modules	A list of all modules in Qt 5.
All Namespaces	A Qt namespace contains enum types, functions, and sometimes classes.
All QML Basic Types	A list of QML basic types in this Qt release.
All QML Modules	A list of all QML modules in Qt 5.
All QML Types	A list of QML types in this Qt release.
Annotated Class List	If you don't know the name of the class you want, but you know what the class should do, you might try looking here.
Inheritance Hierarchy	The C++ class inheritance hierarchy for all classes in the Qt API.
Obsolete Classes	Classes and members marked obsolete that should not be used in new code.
Obsolete QML Types	A list of obsolete QML types that should not be used in new code.
Groups Of Related Classes	If you know what kind of class you want (GUI, painting, I.O, etc), look here

Generic Algorithms	Includes the generic, template-based algorithms
Endian Conversion Functions	Functions to convert between little and big endian representations of numbers
Global Qt Declarations	File includes the fundamental global declarations. It is included by most other Qt header files
Generic Math Functions	File provides various math functions
All Functions	All documented Qt functions listed alphabetically with a link to where each one is declared.

Qt for Android	Provides information about Android support in Qt.
Qt for Embedded Linux	Provides information about Embedded Linux support in Qt.
Qt for Linux/X11	Platform support for Linux/X11.
Qt for VxWorks	Platform support for VxWorks (under a commercial license).
Qt for WinRT	Provides insight into Qt's WinRT port and how to use it.
Qt for Windows	Platform support for Windows.
Qt for iOS	Provides insight into Qt's iOS port and how to use it.
Qt for macOS	Platform support for macOS. macOS (previously known as OS X or Mac OS X) is a UNIX platform and behaves similarly to other Unix-like platforms. The main difference is that X11 is not used as the windowing system. Instead, macOS uses its own native windowing system that is accessible through the Cocoa API. Application development on macOS is done using Xcode, which is available from https://developer.apple.com/xcode/.