- Qt 5.15
- QDoc Manual
- Core Features
- Qt 5.15.19 Reference Documentation

# Core Features

## Signals and Slots

Signals and slots are used for communication between objects. The signals and slots mechanism is a central feature of Qt and probably the part that differs most from the features provided by other frameworks.

### Introduction

In GUI programming, when we ...

## Qt Object Model

The standard C++ object model provides very efficient runtime support for the object paradigm. But its static nature is inflexibile in certain problem domains. Graphical user interface programming is a domain that requires both runtime efficiency and a high level of flexibility. Qt provides this, by combining the speed of C++ with the flexibility of the Qt Object Model.

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## Layout Classes

The Qt layout system provides a simple and powerful way of specifying the layout of child widgets.

By specifying the logical layout once, you get the following benefits:

- Positioning of child widgets.
- Sensible default sizes for windows.
- Sensible minimum sizes for windows.
- ...