Ada Programming/Libraries/Ada.Iterator_Interfaces

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This language feature has been introduced in Ada 2012.

Ada.Iterator_Interfaces is a unit of the Predefined Language Environment since Ada 2012.

Specification

--                     Standard Ada library specification
--   Copyright (c) 2004-2016 AXE Consultants
--   Copyright (c) 2004, 2005, 2006 Ada-Europe
--   Copyright (c) 2000 The MITRE Corporation, Inc.
--   Copyright (c) 1992, 1993, 1994, 1995 Intermetrics, Inc.
--   SPDX-License-Identifier: BSD-3-Clause and LicenseRef-AdaReferenceManual
-- -------------------------------------------------------------------------

generic
   type Cursor;
   with function Has_Element (Position : Cursor) return Boolean;
package Ada.Iterator_Interfaces is
   pragma Pure (Iterator_Interfaces);

   type Forward_Iterator is limited interface;
   function First (Object : Forward_Iterator) return Cursor is abstract;
   function Next (Object : Forward_Iterator; Position : Cursor)
      return Cursor is abstract;

   type Reversible_Iterator is limited interface and Forward_Iterator;
   function Last (Object : Reversible_Iterator) return Cursor is abstract;
   function Previous (Object : Reversible_Iterator; Position : Cursor)
      return Cursor is abstract;

end Ada.Iterator_Interfaces;

See also

Wikibook

• Ada Programming/Libraries/Ada

External examples

• Search for examples of Ada.Iterator_Interfaces in: Rosetta Code, GitHub (gists), any Alire crate or this Wikibook.
• Search for posts related to Ada.Iterator_Interfaces in: Stack Overflow, comp.lang.ada or any Ada related page.

Ada Reference Manual

Ada 2012

• 5.5.1: User-Defined Iterator Types ^[Annotated]

Open-Source Implementations

FSF GNAT

• Specification: a-iteint.ads

drake

• Specification: a-iteint.ads