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From: "patrick.gunia@googlemail.com" <patrick.gunia@googlemail.com>
Newsgroups: comp.lang.ada
Subject: Re: Ada-Singleton-Why does it work like this?
Date: Wed, 25 Mar 2009 03:57:00 -0700 (PDT)
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Date: 2009-03-25T03:57:00-07:00
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Yet another question, if my Singleton_Type is unconstrained, why does
Ada allow creating Access-Types to unconstrained types allowing to
access there record-properties, while not allowing to create an
instance of Singleton_Type directly? I thought that Ada demands a
declaration of an instance before creating an Access-Type to access
it? Maybe I=B4m mixing in C++, but if I declare a pointer in C++ I
either have to create a new instance using "new" in heap-memory where
the pointer points to or I have to use references and then let the
pointer point to a reference. In both cases I first have to create an
object and then let the pointer point to it. When I use access types
in Ada in my example it=B4s possible to create a pointer to a class
which can=B4t be instantiated, because it is unconstrained. Though it
works to access the record-properties using the access-type. Could
anyone tell me what I=B4m getting wrong concerning Ada?

Thank you!