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Date: Fri, 7 Oct 2016 14:30:26 -0700 (PDT)
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Subject: Using generic package to store and retrieve string data
From: James Brewer <firstvestor@gmail.com>
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Xref: news.eternal-september.org comp.lang.ada:32042
Date: 2016-10-07T14:30:26-07:00
List-Id: <comp.lang.ada>

Hey guys, I am trying to create a generic package that will take strings of=
 a fixed length store them in an array one at a time and later remove them =
one at a time. I was using a generic stack example I found on the net to ge=
t started but I can't seem to get it to work for string data.

Is there something that needs to be imported into the main program for stri=
ng handling?
=20
I tested it with character and integer data and it works with those.
Also, this is just a starting point for getting a generic to function with =
string data, ideally this will be converted into a queue.


Here is the code for the generic.

--ads

generic
    Size : Positive;
    type Item is private;
  package Generic_Stack is
    procedure Push(E : in  Item);
    procedure Pop (E : out Item);
    Overflow, Underflow : exception;
  end Generic_Stack;

--adb

package body Generic_Stack is
    type Table is array (Positive range <>) of Item;
    Space : Table(1 .. Size);
    Index : Natural :=3D 0;

    procedure Push(E : in Item) is
    begin
      if Index >=3D Size then
        raise Overflow;
      end if;
      Index :=3D Index + 1;
      Space(Index) :=3D E;
    end Push;

    procedure Pop(E : out Item) is
    begin
      if Index =3D 0 then
        raise Underflow;
      end if;
      E :=3D Space(Index);
      Index :=3D Index - 1;
    end Pop;

  end Generic_Stack;