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From: pvanbell@mhv.net (Paul Van Bellinghen)
Subject: Re: Why Ada is not the Commercial Lang of  Choice
Date: 1997/06/21
Message-ID: <33ab1c1c.2926201@news.mhv.net>#1/1
X-Deja-AN: 251455122
References: <33A7FBFF.29D2@mitre.org> <5o9eca$aoi$1@goanna.cs.rmit.edu.au>
 <EC03q1.J3A@world.std.com>
X-Server-Date: 21 Jun 1997 00:18:36 GMT
Organization: MHVNet
Newsgroups: comp.lang.ada
Date: 1997-06-21T00:18:36+00:00
List-Id: <comp.lang.ada>



This is all well and good when you know the exact address to set the
variable to. The problem comes with a variable of type "address" that
you need to perform masking on. I was unable to re-cast a variable of
type "address" (which was derived from unsigned integer) to an
unsigned integer  so that I could mask out the lower 48 bits. That's
why I went the "unchecked conversion" route. Ada seems to be so
strictly typed that even though a variable is typed or sub-typed as
unsigned integer, it is treated as a completely different type than a
variable typed as unsigned integer.

>>    Mem_Map: Integer;
>>    for Mem_Map'Address use 16#B010_0040#;
>
>By the way, this will typically need a To_Address call, since in many
>implementations, type Address is not an integer type.  The RM recommends
>a private type, which I think is sensible.
>
>- Bob