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Newsgroups: comp.lang.ada
Date: Thu, 27 Feb 2014 08:06:57 -0800 (PST)
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Subject: Re: subtype of System.Address type
From: adambeneschan@gmail.com
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Xref: news.eternal-september.org comp.lang.ada:18764
Date: 2014-02-27T08:06:57-08:00
List-Id: <comp.lang.ada>

On Wednesday, February 26, 2014 9:19:57 PM UTC-8, ashwath...@gmail.com wrot=
e:
> Hello,
>=20
> My compiler(GNAT 3.1 ) gives an error for the following statement.
>=20
>=20
>=20
> =A0subtype MEMORY_RANGE_TYPE is SYSTEM.ADDRESS range 16#0000_0000#..16#7F=
FF_FFFF#;=20
>=20
> It says incorrect constraint for this type.
>=20
> Kindly let me know the mistake I am doing.

Like everyone else said, System.Address is a private type.  If you really n=
eed to use integers as addresses, use System.Storage_Elements.Integer_Addre=
ss:

   subtype Memory_Range_Type is System.Storage_Elements.Integer_Address ran=
ge
      16#0000_0000# .. 16#7FFF_FFFF#;

Integer_Address is required to be either a signed or modular integer subtyp=
e; either way, the above will work as long as both 0 and 7FFFFFFF are in ra=
nge for the implementation-defined subtype.  Then, System.Storage_Elements.=
To_Address(Value) will convert an Integer_Address to a System.Address.  See=
 RM 13.7.1.  (This package has been part of the language since Ada 95.)