Ada Programming/Keywords/interface

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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 isinterface;

Limited interface

Can be used as interface to limited tagged type.

type Printable islimitedinterface;

Synchronized interface

type Printable issynchronizedinterface;

All synchronized interfaces are also limited.

Task interface

Can be used as an interface to a task type.

type Printable istaskinterface;

All task interfaces are also synchronized.

Protected interface

Can be used as an interface to a protected type.

type Printable isprotectedinterface;

All protected interfaces are also synchronized.

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`

Ada Programming/Keywords/interface

Interface types

Normal interface

Limited interface

Synchronized interface

Task interface

Protected interface

See also

Wikibook

Ada Reference Manual

Ada 2005

Ada Quality and Style Guide