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Date: Sun, 18 Mar 2018 17:37:41 -0700 (PDT)
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Subject: little precision about anonymous access types
From: Mehdi Saada <00120260a@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:51060
Date: 2018-03-18T17:37:41-07:00
List-Id: <comp.lang.ada>

I have a little question about (anonymous) access types:
I can do that:
procedure main is
   type A is access INTEGER;
   A_O : A := new INTEGER'(54);
begin
   declare
      B: access INTEGER;
   begin
      B := A_O;
   end;
end main;

But I can't do that, without being told A must be a general access type:
procedure main is
   type A is access INTEGER;
   A_O : A;
begin
   declare
      B: access INTEGER := new INTEGER'(7);
   begin
      A_O := A(B);
   end;
end main;
But I'm doing A_O := some_variable_of_the_stack'Access,
I'm affecting A_O to another access object. Not taking an 'Access out of it.

At first, I wondered what were the scope of declaration of anonymous access objects like B.
Is: "B: access INTEGER := new INTEGER'(7);"
STRICTLY equivalent to
"type B_ANONYMOUS_TYPE is access INTEGER;
B: B_ANONYMOUS_OBJECT;"
chiefly regards to what and when I can affect things to of from anonymous access objects.