From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID
	autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,9559956f3f3ac452
X-Google-Attributes: gid103376,public
From: adam@irvine.com (Adam Beneschan)
Subject: Re: reset boolean.
Date: 1996/08/21
Message-ID: <4vflga$i93@krusty.irvine.com>#1/1
X-Deja-AN: 175544679
references: <4v8jks$gjs@goanna.cs.rmit.edu.au>
 <01bb8f58.afd6bb00$fc899dc0@fielding.east.alsys.com>
organization: /z/news/newsctl/organization
newsgroups: comp.lang.ada
Date: 1996-08-21T00:00:00+00:00
List-Id: <comp.lang.ada>


Neil O'Brien <obrien@east.thomsoft.com> writes:
 >
 >On Sunday, August 18, 1996, Charlie_Brown wrote...
 >> 	Hi to all,
 >> 		I have a question regarding a boolean statement. 
 >> What I want to do is reset the statement to neither false nor true.
 >> Is it possible?
 >> 	If anyone has an idea please help me out.
 >> Thanks in advance.
 >> Lyndon. 
 >> 
 >
 >It is a truth value, it can only have two possible settings true or false,
 >but you could declare your own enumeration type for example
 >
 >my_bool is (true, false, neutral)
 >
 >and use that instead - to be honest it seems a bit of a bizarre thing to
 >want to do, perhaps if you explained why you want it someone might be able
 >to suggest a better way.
 >

I've never understood these three-way Booleans.  To be complete,
shouldn't there be a lot more values in the enumeration type?  E.g.:

   type My_Bool is (True, False, Maybe, True_And_False, It_Depends,
                    Dont_Know, Dont_Care, None_Of_Your_Business,
                    All_Of_The_Above);

:)

                                -- Adam