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"raise" and "exception" ...

Posted on 2003-10-27
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Last Modified: 2010-04-02
To C++ Experts,

   How is "raise" to do with "exceptions" ? can I have an example ?
 thanks.

 
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Question by:meow00
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4 Comments
 
LVL 19

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by:Dexstar
Dexstar earned 50 total points
ID: 9630552
meow00:

> How is "raise" to do with "exceptions" ? can I have an example ?

In C++, you don't "raise" exceptions.  You "throw" them.

     void SomeFunction()
     {
          try
          {
               int i = 5;

               if ( i < 5 )
                    throw i;
          }
          catch( int n )
          {
               cout << "Caught int Exception: " << n << endl;
          }
     }

Does that make it more clear?

Hope that helps,
Dex*
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LVL 1

Author Comment

by:meow00
ID: 9630610
I see .... so what does raise do :
In the book (C++ in a nutshell): "The raise function sends a signal to the running program." But I don't really understand what it means ......
thanks.
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LVL 19

Accepted Solution

by:
Dexstar earned 50 total points
ID: 9630633
meow00:

> I see .... so what does raise do :
> In the book (C++ in a nutshell): "The raise function sends a signal to the
> running program." But I don't really understand what it means ......

I've been programming in C/C++ since 1992 or so, and I've never used that function.  So, I looked it up and found this:
     http://www.qnx.com/developer/docs/qnx_6.1_docs/neutrino/lib_ref/r/raise.html

Which will give you a sample of its usage.
But, in general, that is the "old sk00l" way of doing it.  With C++, you have exceptions, and so the signal()/raise() functions are pretty much obsolete.

Dex*
0
 
LVL 19

Expert Comment

by:Dexstar
ID: 9634621
meow00:

I'm glad that you accept my answers, but I'm sure it isn't necessary to split the points between my 2 answers, since they all go to the same person.  You should save that for when you want to split the points between two different people.  :)

Dex*
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