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From: "Steve" <nospam_steved94@comcast.net>
Newsgroups: comp.lang.ada
References: <pIw0c.84623$dP1.233768@newsc.telia.net>
Subject: Re: Heterogenous array
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Date: 2004-03-01T02:22:40+00:00
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Change your type definition to have a default descriminant:

type Parameter_Definition(Param_Type:T_Param_Type:=Int) is record
...

You'll also find that to assign to one of the elements in the array, you
need to do a full record assignment to establish the type.  Once the type is
set you can manipulate individual field values if needed.

Steve
(The Duck)

"Bj�rn Persson" <spam-away@nowhere.nil> wrote in message
news:pIw0c.84623$dP1.233768@newsc.telia.net...
I need an array type that can hold elements of different types. My
current attempt (somewhat simplified) is below. My question is, is there
a way to do this without pointers?

    type T_Param_Type is (Int, Str);
    type Parameter_Definition(Param_Type : T_Param_Type) is record
       Name : A_Bounded_String_Type;
       case Param_Type is
          when Int =>
             Min : Integer;
             Max : Integer;
             Int_Value : Integer;
          when Str =>
             Str_Value : Ada.Strings.Unbounded.Unbounded_String;
       end case;
    end record;
    type Parameter_Definition_Pointer is access Parameter_Definition;
    type Parameter_Spec is array(Positive range <>) of
                           Parameter_Definition_Pointer;

"array(Positive range <>) of Parameter_Definition" gave me the error
"unconstrained element type in array declaration". I also tried a tagged
type with subtypes and "array(Positive range <>) of
Parameter_Definition'Class", and got the same error.

This isn't really a dynamic data structure so I feel that pointers
shouldn't be necessary. Any ideas?

-- 
Bj�rn Persson

jor ers @sv ge.
b n_p son eri nu