Re: Class hierarchy of exceptions (Ada, C++)

From: Ioannis Vranos (ivr_at_remove.this.grad.com)
Date: 03/30/05 

Date: Wed, 30 Mar 2005 16:07:13 +0300

fabio de francesco wrote:

> Is the following permitted in C++?
>
> // file point.cpp
>
> #include <iostream>
>
> int *p = 0;
>
> void fun()
> {
> int a = 1;
> p = &a;
> }
>
> int main()
> {
> fun();
> ++(*p);
> std::cout << *p << '\n';
> return 0;
> }
>
> My compiler (GCC-3.4.1) doesn't raise any error with "g++ point.cpp
> -Wall -W".
>
> Shouldn't it have to complain?

It is permitted. What you are incrementing above is the value stored in variable a.

Also check this:

#include <iostream>
#include <cstdlib>
#include <csignal>

inline void SigSegVHandler(int signal)
{
     using namespace std;

     cerr<<"Illegal memory operation!\n"<<"Exiting...\n";

     exit(EXIT_FAILURE);
}

int main()
{
     using namespace std;

     signal(SIGSEGV, SigSegVHandler);

     int *p= 0;

     ++(*p);

     return 0;
} 

-- 
Ioannis Vranos
http://www23.brinkster.com/noicys

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