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From: dweller@dfw.net (David Weller)
Subject: Re: C++'s pointer vs Ada's Access type
Date: 1996/08/01
Message-ID: <4tqn1a$gb8@dfw.dfw.net>#1/1
X-Deja-AN: 171427026
references: <31FFD4A6.41C6@afit.af.mil>
organization: DFWNet -- Public Internet Access
newsgroups: comp.lang.ada
Date: 1996-08-01T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <31FFD4A6.41C6@afit.af.mil>,
Ding-yuan Sheu  <dsheu@afit.af.mil> wrote:
>
>However, there comes a problem.
>In C++, ip can be a pointer that points to a integer array.
>Therefore, C++ programmers can do the following initialization:
>
>	int	Array[100];
>	ip = &Array;
>	for (i:=0;i++,99) { (*ip+i)   = 0; }
>
>My question is how I can do the same thing in Ada by using ip 
>to initialize Array instead to directly initialize Array. 
>

There are a lot of "implicit" types in C++, but not in Ada.  To
accomplish the code segment you have above, you must declare a type
that is an unconstrained array of integers:
	type Int_Array is array(Natural range <>) of Integer;
	-- I use Natural as the index to conceptually match C's arrays

Then you simply make a declaration:
	A : Int_Array(0..99) := (others=>0);

No pointer arithmetic involved :-)  (Although Ada does support it with
System.Storage_Elements package)

Did I answer the question, or misunderstand it?

-- 
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