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From: Pascal Obry <p.obry@wanadoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Counter-proposal for variable arrays
Date: 08 Oct 2003 10:57:52 +0200
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Ole-Hjalmar Kristensen <ole-hjalmar.kristensen@sun.com> writes:

> It would be a good idea to check your facts before posting. Arrays are
> *constant* pointers, so the assignment above will not compile.

Right. Should have been "char *ptr1 = malloc (156);" idem for ptr2.

> But I agree that arrays are not first class citizens in C/C++.
> The relationship with pointers is obvious if you look at the following
> relationship, which always holds:
> 
> x[13] == *(x+13) == *(13+x) == 13[x] !!!!
> 
>     PO>    void proc (char *ptr);
> 
>     PO> And into ptr you can pass objects such as:
> 
>     PO>    ptr1        
> 
>     PO>    new char[12]
> 
> Yes, there is no range check, just like Fortran.

That's not the point. My point is that you can pass ptr1 or "new char[12]"
into a "char*" parameter. Hence the fact that this is pointers not arrays.

>     PO>    "whatever"
> 
> Yes, like Ada, C strings are arrays of characters :-)

Again that's not the point. In Ada you can't pass "whatever" into a procedure
parameter declared as:

   procedure Proc (Ptr : access Character);

In Ada "whatever" is a String, a string is an array:

   type String is array (Positive range <>) of Character;

and there is no relation between Ada String and pointer of characters.

>     PO> Call this array if you like.
> 
> I do, 

As you like!

Pascal.

-- 

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