Another pointer question

#1 08-06-2008, 05:22 AM

If I point to some basic type, how can I set the value at the pointer?

eg:

type I_ptr is access integer;
..
..
..
variable A : I_ptr
...
A := new integer;

A := 10; --does not work - complains that A is not an integer (rightly
so);

same with any new types that are discrete

type A_t;
type A_ptr is access A_t;

type A_t is (X, Y, Z);
...
variable S : A_ptr;
...
S := new A_t;

S := X; --same problem as with integer;

Am I, as usually, trying to go outside the scope of VHDL?

#2 08-06-2008, 07:32 AM

On Wed, 6 Aug 2008 02:22:29 -0700 (PDT), Tricky <Trickyhead@gmail.com>
wrote:

>If I point to some basic type, how can I set the value at the pointer?
>
>eg:

>type I_ptr is access integer;

>variable A : I_ptr
>..
>A := new integer;
>
>A := 10; --does not work - complains that A is not an integer (rightly
>so);

Dereferencing the pointer when you need the contents is normally
implicit; but in this case would cause ambiguity (to make it obvious,
consider a pointer to a pointer to an integer!).

However you can dereference it explicitly to avoid the problem

A.all := 10;

>S := new A_t;
>S := X; --same problem as with integer;

S.all := x;

- Brian

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