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From: Stephen Leake <stephen_leake@stephe-leake.org>
Newsgroups: comp.lang.ada
Subject: Re: Ada and string literals
References: <4978d638-a04b-4561-85e9-cf6620265af2@googlegroups.com>
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Date: Fri, 01 Feb 2013 20:55:06 -0500
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Date: 2013-02-01T20:55:06-05:00
List-Id: <comp.lang.ada>

codeallergy <romainbeckers@gmail.com> writes:

> another question: how free a object from a procedure ?
>  
> example:
> procedure Free_Abc (Target : access String)
> is
> begin
>    GNAT.Strings.Free(Target); -- error
> end Free_Abc;
>
> this code produce the error: actual for "X" must be a variable
>
> why disallow that ?

Because Free sets its argument to null, which it can't do if it's not a
variable.

Setting the argument to null helps avoid dangling pointers.

-- 
-- Stephe