From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,INVALID_MSGID
	autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: 103376,5c1c45943bf6a5bc
X-Google-Attributes: gid103376,public
From: Dale Stanbrough <dale@goanna.cs.rmit.EDU.AU>
Subject: Re: 'first of strings returned from a function should be 1?
Date: 1997/07/27
Message-ID: <5rfcs1$i3j$1@goanna.cs.rmit.edu.au>#1/1
X-Deja-AN: 259379884
Distribution: world
References: <5rcaqi$le8$1@goanna.cs.rmit.edu.au>
 <01bc9a76$459c2250$4c8371a5@dhoossr>
X-XXMessage-ID: <B001745647021B17@obibicut.cs.rmit.edu.au>
Organization: Royal Melbourne Institute of Technology
Newsgroups: comp.lang.ada
Date: 1997-07-27T00:00:00+00:00
List-Id: <comp.lang.ada>


David C. Hoos writes:

"What's wrong with Result_String (Result_String'first) for getting at the
 first character of a function result?"

Because i wanted to call the function, store the first character and not
declare a local string. I am guessing that a local string would require
extra copying (which i generally try to design out of programs)
from heap to stack, although this may not be the case.

"From my own experience, I know that it is easy to write a poor function
 returning a string result of which the first subscript is not 1, and I
 always make the effort to slice (if necessary) the result into the range 1
 . result'length, but if you're using
 something you can't change, then something like 
 New_Result (1 .. Result_String'length) :=
 Result_String(Result_String'first .. result_String'first +
 Result_String'length -1)
 will do the job."

Yes, this will work, but it also requires copying. The subtype solution
seems better to me.

thanks anyway.

Dale