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From: "Jean-Pierre Rosen" <rosen@adalog.fr>
Newsgroups: comp.lang.ada
Subject: Re: Computer Language Shootout
Date: Mon, 21 Jul 2003 09:21:45 +0200
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"Robert Spooner" <rls19@psu.edu> a �crit dans le message news:
bf9crp$18rg$1@f04n12.cac.psu.edu...
> I tried this using the following program and gnat version 3.13p on
> windows professional 2000 with the following result:
>
> with Ada.Text_IO;
>
> procedure No_String_Length_Limit_Test is
>
>     package Tio renames Ada.Text_IO;
>
>
>     function Get_Line (Buffer_Size : Positive := 1) return String is
>        Buffer : String (1..Buffer_Size);
>        Last   : Natural;
>     begin
>        Tio.Get_Line (Buffer, Last);
>        if Last < Buffer'Last then
>           return Buffer(1..Last);
>        else
>           return Buffer & Get_Line (2*Buffer_Size);
>        end if;
>     end Get_Line;
>
>
> begin -- No_String_Length_Limit_Test
>
>     loop
>        Tio.Put ("Enter a message, <Return> to exit: ");
>        declare
>           The_Message : String := Get_Line;
>        begin
>           exit when The_Message'Length = 0;
>           Tio.Put_Line ("The message is " & The_Message);
>        end;
>     end loop;
>
> end No_String_Length_Limit_Test;
>
> no_string_length_limit_test.adb:16:26: ambiguous operand for concatenation
> no_string_length_limit_test.adb:16:26: possible interpretation at line 8
> Done--error detected.
>
> Can someone tell me why the operand is ambiguous?
>
Because there are two possible meanings :-)
1) return the catenation of Buffer with the result of the call to Get_Line
with (2*Buffer_Size) as
   a parameter (what you intended).
2) return the catenation of Buffer with the single character obtained by
indexing the result of the
   call to Get_Line (with the default paramater) by the index value
(2*Buffer_Size).

No Gnat bug here!

--
---------------------------------------------------------
           J-P. Rosen (rosen@adalog.fr)
Visit Adalog's web site at http://www.adalog.fr