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From: Matthew Heaney <mheaney@on2.com>
Newsgroups: comp.lang.ada
Subject: Re: String declaration and initialization
Date: Thu, 22 May 2008 09:16:19 -0700 (PDT)
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Date: 2008-05-22T09:16:19-07:00
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On May 22, 11:47=A0am, S=E9bastien <seb.mor...@gmail.com> wrote:
>
> declare
> =A0 =A0 =A0 =A0 buffer: String; -- =A0Error at compile time
> begin
> =A0 =A0 =A0 =A0 case SomeTest is
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 case TEST1 =3D>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 buffer :=3D "Test1";
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 case TEST2 =3D>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 buffer :=3D "Test2";
> =A0 =A0 =A0 =A0 end case;
> =A0 =A0 =A0 =A0 MyTreatment1(buffer, buffer'Size);
> =A0 =A0 =A0 =A0 MyTreatment2(buffer, buffer'Size);
> =A0 =A0 =A0 =A0 MyTreatment3(buffer, buffer'Size);
> end;
>
> But How can I do this since I can't declare a string without constraint?

The simplest way is to use a bounded or unbounded string:

declare
  S : Unbounded_String;
begin
  case Some_Test is
     when T1 =3D> S :=3D To_Unbounded_String ("test1");
  ...
end;

Another way is to use a table like you can in C:

declare
  Test1 : aliased constant String :=3D "test1";
  Test2 : aliased constant String :=3D "test2";

  type Table_Type is array (Test_Type) of
    not null access constant String;

  Table : constant Table_Type :=3D
    (T1 =3D> Test1'Access,
     T2 =3D> Test2'Access,
     ...);

  S : String renames Table (Some_Test).all;
begin
=2E..
end;