Re: [Dev-C++] Constructors throwing exceptions.

[Daniel G. <sp...@ho...>]

Hey thanks very much for your help, that's excellent!!!!!

Daniel


>From: "Abhijit Shylanath" <mu...@gm...>
>To: "Dev-C++ Mailing List" <dev...@li...>
>Subject: Re: [Dev-C++] Constructors throwing exceptions.
>Date: Thu, 25 Jul 2002 23:28:22 +0530
>
>----- Original Message -----
>From: "Daniel Glenfield" <sp...@ho...>
>To: <dev...@li...>
>Sent: Tuesday, July 23, 2002 6:22 PM
>Subject: [Dev-C++] Constructors throwing exceptions.
>
>
> > Hello all,
> >    I want my constructors (default, overloaded, and copy) to throw an
> > exception if they fail.
> >
> > 1) How do I test if the constructor has failed?
>
>--------------Start--------------------
>
>#include <iostream>
>
>using std::cout;
>using std::endl;
>
>class foo
>{
>     public:
>         foo()
>         {
>             throw "bar";
>         }
>};
>
>int main()
>{
>     try
>     {
>         foo baz;
>     }
>
>     catch(const char *err)
>     {
>         cout << "I caught\"" << err << "\" from foo" << endl;
>     }
>
>     return 0;
>}
>--------------Stop------------------
>
> > 2) Is it better to create an Exception class to throw exception objects,
> > rather than throwing strings and integers?
>
>I think it's better to have objects, so you can easily upgrade the
>error-handling capabilties of the program. This way, you can also have
>different attributes to an error (fatal/non-fatal, etc.) You can also make
>the error class have functions like do_what_you_have_to(), which can do 
>what
>it has to (fatal errors exit, non-fatals drop a log and print a message)
>
> > 3) Where does the catch block go? In the main function after the object
>has
> > been created? Or in the constructor body?
>
>Whenever you throw something, a new object 'something' is created and
>dispatched to the catch{} block. This object's scope is similar to that of
>an object returned by the function. You can have any number of nested
>levels, as long as the level which is throw()ing is within a try{}. So you
>can have
>
>void baz()
>{
>     throw new AnException("yeeppep", 23);
>}
>
>void bar()
>{
>     baz();
>}
>
>void foo()
>{
>     bar();
>}
>
>try
>{
>     foo();
>}
>
>catch(AnException my_very_own)
>{
>     // whatever
>     // delete my_very_own;
>}
>
>If I typed something wrong (grammatical, not technical... no wait, maybe
>that too :), excuse me... I'm so friggin' sleepy. G'night to you all.
>
>
>
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