Re: [gtkmm] OT: C++ exceptions

[Spandan Bhatt <spandan_bhatt yahoo com>]

Can somebody enlighten me?
How is unexpected exception thrown by this code?
what does
Foo(int _i) throw(Ex1);
mean?(does it always throw the exception? Even if it
does from the code I saw it looked like that exception
was suposed to be handled!! where is the unexpected
exception. I must be making some silly mistake..)
Spundun
--- Jarek Dukat <madmaxer poczta fm> wrote:
> This question is OT, but there are many C++ experts
> here so perhaps you
> could explain it. Please look at this sample code:
> 
> // ---------------------------------------------
> #include <exception>
> #include <iostream>
> using namespace std;
> 
> struct Ex1 {};
> struct Ex2 {};
> 
> class Foo {
>   int i;
> public:
>   Foo(int _i) throw(Ex1);
>   ~Foo();
> };
> Foo::Foo(int _i) throw(Ex1) : i(_i) {
>   cerr << "Foo CTOR: " << i << endl;
>   if ( i == 2 )
>     throw Ex2();
> }
> Foo::~Foo() {
>   cerr << "Foo DTOR: " << i << endl;
> }
> 
> void my_unex() {
>   cerr << "UNEXPECTED!" << endl;
>   throw;
> }
> 
> int main() {
>   set_unexpected(my_unex);
>   try {
>     Foo foo1(1);
>     Foo foo2(2);
>   } catch ( Ex1& ) {
>     cerr << "Ex1 caught" << endl;
>   } catch ( Ex2& ) {
>     cerr << "Ex2 caught" << endl;
>   }
>   return 0;
> }
> // ---------------------------------------------
> 
> After compiling it with different compilers I get
> different! results!
> 
> --- VC6:
> Foo CTOR: 1
> Foo CTOR: 2
> Foo DTOR: 1
> Ex2 caught
> 
> --- G++ 3.1 (dla 2.95 tak samo):
> Foo CTOR: 1
> Foo CTOR: 2
> UNEXPECTED!
> Aborted
> 
> And according to my knowledge about C++ exceptions a
> correct result
> should be:
> Foo CTOR: 1
> Foo CTOR: 2
> UNEXPECTED!
> Foo DTOR: 1
> Ex2 caught
> 
> Obviously VC ignores unexpected() handler, and G++
> treats it much too
> seriously :)
> What do you think about it?
> 
> -- 
> struct Sig {
>   string name("     J a r e k   D u k a t     ");
>   string mail(" madmaxer (at) poczta (dot) fm ");
> };
> 
> 
>
----------------------------------------------------------------------
> Wiesz, co zdarzylo sie dzisiaj? >>>
> http://link.interia.pl/f1605
> 
> 
> _______________________________________________
> gtkmm-list mailing list
> gtkmm-list gnome org
> http://mail.gnome.org/mailman/listinfo/gtkmm-list


__________________________________________________
Do You Yahoo!?
Sign up for SBC Yahoo! Dial - First Month Free
http://sbc.yahoo.com