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From: anon@att.net
Newsgroups: comp.lang.ada
Subject: Re: Warning: Storage error
Date: Sat, 9 Aug 2014 16:07:09 +0000 (UTC)
Organization: Aioe.org NNTP Server
Message-ID: <ls5gvc$97m$1@speranza.aioe.org>
References: <ls5e8r$373$1@speranza.aioe.org>
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Xref: news.eternal-september.org comp.lang.ada:21609
Date: 2014-08-09T16:07:09+00:00
List-Id: <comp.lang.ada>

Using n normally defined integer with the bounds set to - 2GB .. 2GB, 
this type of unbound record size can range from 0 to 2GB.


All though today, most systems have 8 to 64 GB of main memory and up 
to 256 TB ( 2 ** 64 ) of virtual storage the Ada compiler does not 
know at compile time, the total run-time system memory or how much 
memory may be allocated to your program.  To correct this add a 
discriminant type or subtype

  --  Same size as just using "Integer' but compiler does not 
  --  generate the storage warnings 

  subtype D_Integer is Integer range 0 .. Integer ' Last ;

  type My_String ( Length : D_Integer := 0 ) is record
                                                     Str: String ( 1 .. Length ) ;
                                                   end record ;


You could say that GNAT is being overly touchy on some standard 
statements when using predefined types such as "Integer" or types 
that could cause a problem.


In <ls5e8r$373$1@speranza.aioe.org>, Victor Porton <porton@narod.ru> writes:
>   type My_String (Length: Integer := 0) is 
>      record
>         Str: String(1..Length);
>      end record;
>   
>warning: creation of "My_String" object may raise Storage_Error
>
>Why this warning?
>
>-- 
>Victor Porton - http://portonvictor.org