OBJECT

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgObject
• Last revised: 2019-06-26

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Built-in type providing run-time type information

Syntax

type object

as fb_BaseVT ptr vtable_ptr
declare constructor()

end type

Usage

type typename extends object
end type

dim variable as object

Description

Object is a built-in type which provides Run-Time Type Information (RTTI) for all types derived from it using Extends, allowing them to be used with Operator Is, and to support Virtual and Abstract methods.

Extending the built-in Object type allows to add an extra hidden vtable pointer field at the top of the Type. The vtable is used to dispatch Virtual and Abstract methods and to access information for run-time type identification used by Operator Is.

Examples

See the Operator Is page, the Virtual and Abstract pages.

Dialect Differences

• Not available in the -lang qb dialect unless referenced with the alias __Object.

Differences from QB

• New to FreeBASIC

See also

• Extends
• Extends Zstring
• Extends Wstring
• Operator Is
• Virtual
• Abstract

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