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From: "bubble" <bubble@bubble.d2g.com>
Newsgroups: comp.lang.ada
Subject: Re: dynamic array as return value?
Date: Fri, 15 Oct 2004 14:02:06 +0800
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subtype String_80 is String(1.. 80);



function makeSpaceString return String is

      spaceStr:String_80 := (others => ' ');

begin

      return spaceStr;  --can I do it?

end makeSpaceString;





function makeSpaceString(length:Natural) return String is

      spaceStr :string(1..length) := (others => ' ');

begin

      return spaceStr;   --- ???

end makeSpaceString;





Hi dear:

Thank your answer.





my question is about memory allocation in ada95.



I remember,local variable memory allocate should use stack not heap memory.



In above 2 functions.



the variable spaceStr are local variable in function,right?



after execute end of function,data in stack memory should free to system.

it mean I return a data in stack and it is free,it will occure illegal
access?

I don't understand why "dynamic array" can be return?

"bubble" <bubble@bubble.d2g.com> �b�l�� news:cklea4$9eb$1@netnews.hinet.net
�����g...
> according to a book, " Object-oriented Software in Ada 95 Second Edition"
>
> section 8.9 Dynamic Array
>
>
> In Ada the bounds of an array need not be fixed at compile-time, as they
can
> be specified by an object whose
> value is not fixed until run-time. Such an array is known as a dynamic
> array. However, once elaborated, the
> bounds of the dynamic array cannot be changed. Unlike many other
languages,
> Ada allows a dynamic array to be
> returned as the result of a function. For example, a function
Reverse_String
> can be written which reverses
> the characters passed to it.
>
> An implementation of the function Reverse_String is as follows:
>
> function Reverse_String( Str:in String ) return String is
>     Res : String( Str'Range ); --Dynamic bounds
> begin
>     for I in Str'Range loop
>         Res( Str'First+Str'Last-I ) := Str( I );
>     end loop;
>     return Res;
> end Reverse_String;
>
>
> I have a question.
> if ada allow dynamic array can be a return value,it mean bounds array can
be
> return value?
> if can't,why?
>
>