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=-1.9 required=5.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.4
X-Google-Thread: 103376,703c4f68db81387d
X-Google-Thread: 109fba,703c4f68db81387d
X-Google-Thread: 115aec,703c4f68db81387d
X-Google-Thread: f43e6,703c4f68db81387d
X-Google-Attributes: gid103376,gid109fba,gid115aec,gidf43e6,public
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!news1.google.com!newsread.com!news-xfer.newsread.com!news.glorb.com!newsfeed00.sul.t-online.de!t-online.de!irazu.switch.ch!switch.ch!news.grnet.gr!newsfd02.forthnet.gr!not-for-mail
From: Ioannis Vranos <ivr@remove.this.grad.com>
Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime,comp.software-eng
Subject: Re: Class hierarchy of exceptions (Ada, C++)
Date: Wed, 30 Mar 2005 15:22:18 +0300
Organization: FORTHnet S.A., Atthidon 4, GR-17671 Kalithea, Greece,
 Tel: +30 2109559000, Fax: +30 2109559333, url: http://www.forthnet.gr
Message-ID: <1112185337.193940@athnrd02>
References: <BPu2e.108090$Vf.4154474@news000.worldonline.dk>
 <S9w2e.4955$u7.933@reader1.news.jippii.net>
NNTP-Posting-Host: athnrd02.forthnet.gr
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Trace: athprx02.forthnet.gr 1112185337 31671 193.92.150.73 (30 Mar 2005
 12:22:17 GMT)
X-Complaints-To: abuse@forthnet.gr
NNTP-Posting-Date: Wed, 30 Mar 2005 12:22:17 +0000 (UTC)
User-Agent: Mozilla Thunderbird 1.0.2 (Windows/20050317)
X-Accept-Language: en-us, en
In-Reply-To: <S9w2e.4955$u7.933@reader1.news.jippii.net>
Cache-Post-Path: newsfd02!unknown@ppp13-adsl-131.ath.forthnet.gr
Xref: g2news1.google.com comp.lang.ada:10150 comp.lang.c++:47954
 comp.realtime:1829 comp.software-eng:5465
Date: 2005-03-30T15:22:18+03:00
List-Id: <comp.lang.ada>

Tapio Kelloniemi wrote:

> STL is safer, but it cannot always be
> used (eg. when interfacing to foreign code).


An example?


> Another example:
> 
> int* f()
> {
>   int i = 3;
>   int& l = *(new int);
> 
>   l = i;
>   int* p = &i; // Should be int* p = &l;
> 
>   return p;
> }
> 
> int main()
> {
>   int* p = f();
>   *p = 4;
>   return 0;
> }
> 
> # g++ -Wall -o temp temp.cc
> #
> 
> Not even a warning and the program does not crash on my system! Valgrind
> revealed the error (and thought it was a G++ bug).


Strictly speaking one shouldn't use such variable names. However this is not easy to check 
all those things. C++ aims to be an *enabling* language. For example one could have 
written the following code for a system:


int* f()
{
   // For setting panel indication.
   int *p =reinterpret_cast <int *>(0x148);

   // For reading external thermometer
   volatile const int *r= reinterpret_cast<volatile const int *>(329);

   // ...

   return p;
}

int main()
{
   int* p = f();
   *p = 4;
   return 0;
}




-- 
Ioannis Vranos

http://www23.brinkster.com/noicys