[Overview][Constants][Types][Classes][Procedures and functions][Variables] | Reference for unit 'Classes' (#fcl)

# Reference for unit 'Classes'

Basic classes for FCL

`uses`
`sysutils,`
`typinfo;`

## Overview

This documentation describes the FPC classes unit. The Classes unit contains basic classes for the Free Component Library (FCL):

- a TList class for maintaining lists of pointers,
- TStringList for lists of strings,
- TCollection to manage collections of objects
- TStream classes to support streaming.

Furthermore it introduces methods for object persistence, and classes that understand an owner-owned relationship, with automatic memory management.