< Ada Programming < Keywords
Ada. Time-tested, safe and secure.

This language feature is only available from Ada 2005 on.

Used to declare an interface. Interfaces are the most important innovation in Ada 2005. The basic semantic has been taken from the interface concept of the Java programming language. Interface inheritance is a reduced form of multiple inheritance.

Interface types

There are various forms of interfaces available:

Normal interface

The normal interface is declared as:

 type Printable is interface;

Limited interface

Can be used as interface to limited tagged type.

 type Printable is limited interface;

Synchronized interface

type Printable is synchronized interface;

All synchronized interfaces are also limited.

Task interface

Can be used as an interface to a task type.

type Printable is task interface;

All task interfaces are also synchronized.

Protected interface

Can be used as an interface to a protected type.

 type Printable is protected interface;

All protected interfaces are also synchronized.

See also

Wikibook

Ada Reference Manual

Ada 2005

Ada Quality and Style Guide

Ada Keywords
abort else new return
abs elsif not reverse
abstract (Ada 95) end null
accept entry select
access exception of separate
aliased (Ada 95) exit or some (Ada 2012)
all others subtype
and for out synchronized (Ada 2005)
array function overriding (Ada 2005)
at tagged (Ada 95)
generic package task
begin goto pragma terminate
body private then
if procedure type
case in protected (Ada 95)
constant interface (Ada 2005) until (Ada 95)
is raise use
declare range
delay limited record when
delta loop rem while
digits renames with
do mod requeue (Ada 95) xor
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