Ada Programming/Libraries/Ada.Environment Variables

Ada. Time-tested, safe and secure.

This language feature is only available from Ada 2005 on.

Ada.Environment_Variables is a unit of the Predefined Language Environment since Ada 2005.


--                     Standard Ada library specification
--   Copyright (c) 2003-2018 Maxim Reznik <>
--   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
-- -------------------------------------------------------------------------

package Ada.Environment_Variables is

   pragma Preelaborate (Environment_Variables);

   function Value (Name : in String) return String;

   function Exists (Name : in String) return Boolean;

   procedure Set (Name  : in String;
                  Value : in String);

   procedure Clear (Name : in String);

   procedure Clear;

   procedure Iterate
    (Process : not null access procedure
                                (Name  : in String;
                                 Value : in String));

end Ada.Environment_Variables;

See alsoEdit


External examplesEdit


Ada Reference ManualEdit

Ada 2005Edit

Ada 2012Edit

Open-Source ImplementationsEdit