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Ada Programming/Keywords/interface

< Ada Programming | Keywords

This language feature is only available from Ada 2005 on.

Ada. Time-tested, safe and secure.
Ada. Time-tested, safe and secure.

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

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There are various forms of interfaces available:

Normal interface

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The normal interface is declared as: 

 type Printable is interface;

Limited interface

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Can be used as interface to limited tagged type. 

 type Printable is limited interface;

Synchronized interface

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type Printable is synchronized interface;

All synchronized interfaces are also limited.

Task interface

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Can be used as an interface to a task type. 

type Printable is task interface;

All task interfaces are also synchronized.

Protected interface

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Can be used as an interface to a protected type. 

 type Printable is protected interface;

All protected interfaces are also synchronized.

See also

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Wikibook

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Ada Reference Manual

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Ada 2005

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Ada Quality and Style Guide

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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 parallel (Ada 2022) terminate
body pragma then
if private type
case in procedure
constant interface (Ada 2005) protected (Ada 95) until (Ada 95)
is use
declare raise
delay limited range when
delta loop record while
digits rem with
do mod renames
requeue (Ada 95) xor
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