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From: sommar@enea.UUCP (Erland Sommarskog)
Newsgroups: net.lang.ada
Subject: AND, OR & XOR on integers
Message-ID: <1255@enea.UUCP>
Date: Sun, 23-Mar-86 11:12:13 EST
Article-I.D.: enea.1255
Posted: Sun Mar 23 11:12:13 1986
Date-Received: Tue, 25-Mar-86 05:25:53 EST
References: <306@telesoft.UKE> <4700020@ada-uts>
Reply-To: sommar@enea.UUCP (Erland Sommarskog)
Distribution: net
Organization: Enea Data, Sweden
List-Id: <comp.lang.ada>

In article <4700020@ada-uts> stt@ada-uts.UUCP writes:
>
>AND, OR, and XOR are defined on boolean arrays (whether packed or not).
>If you have a great desire to apply these operators to Integers,
>then you will have to implement them via pragma-Interfaced functions (in C
>or assembler), or hope that your compiler supports packed boolean arrays
>and Unchecked_Conversion between Integers and appropriately-long
>packed, constrained, boolean arrays.

NO, NO, NO! The author of this doesn't seem very knowledgeable in Ada. What
you do if you need logical operators on integers is of course:

FUNCTION "XOR"( IN Number : integer) RETURN boolean_value;

And to implement this functions is not very hard, unless you don't want
go as fast as an assembler instruction.

Erland Sommarskog