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kunal
Guest
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 Posted: Thu Aug 18, 2005 1:06 pm Post subject: why these program terminate abnormally |
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Hello friends,
i just cn't understand y these program terminate abnormally.
1.
int main()
{
try
{
throw ;
cout << "Start" ;
}
catch(...)
{
cout << "Exception" ;
}
cout << "End" ;
return 0 ;
}
o/p : Abnormal program termination.
2.
class Excep
{
public:
Excep()
{
cout << "ctor"<< endl ;
}
~Excep()
{
throw 3 ;
cout << "dtor"<< endl ;
}
} ;
void Fn()
{
Excep e ;
throw 3 ;
}
int main()
{
try
{
Fn() ;
}
catch(...)
{
cout << "Exception" ;
}
return 0 ;
}
O/P : ctor abnormal program termination.
plz expalin me y this happens.
thx in advance.
regards--
kunal
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]
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Kai-Uwe Bux
Guest
|
| Posted: Thu Aug 18, 2005 3:44 pm Post subject: Re: why these program terminate abnormally |
|
|
kunal wrote:
| Quote: | Hello friends,
i just cn't understand y these program terminate abnormally.
1.
int main()
{
try
{
throw ;
cout << "Start" ;
}
catch(...)
{
cout << "Exception" ;
}
cout << "End" ;
return 0 ;
}
o/p : Abnormal program termination.
|
Standard clause 15.1/8:
If no exception is presently being handled, executing a throw-expression
with no operand calls terminate().
| Quote: |
2.
class Excep
{
public:
Excep()
{
cout << "ctor"<< endl ;
}
~Excep()
{
throw 3 ;
cout << "dtor"<< endl ;
}
} ;
void Fn()
{
Excep e ;
throw 3 ;
}
int main()
{
try
{
Fn() ;
}
catch(...)
{
cout << "Exception" ;
}
return 0 ;
}
O/P : ctor abnormal program termination.
|
Standard clause 15.2/3:
... If a destructor called during stack unwinding exits with an exception,
terminate() is called ...
Best
Kai-Uwe Bux
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Hyman Rosen
Guest
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| Posted: Thu Aug 18, 2005 3:45 pm Post subject: Re: why these program terminate abnormally |
|
|
kunal wrote:
| Quote: | i just cn't understand y these program terminate abnormally.
int main() { try { throw ;
|
You are trying to rethrow an exception, but there is no exception
to rethrow, so as per 15.1/8, terminate() is called.
| Quote: | struct Excep { ~Excep() { throw 3 ; } } ;
void Fn() { Excep e ; throw 3 ; }
int main() { try { Fn() ; }
|
When Fn throws 3, it unwinds the stack and thus calls Excep::~Excep()
which also throws 3. As per 15.5.1, when the destructor of an object
being destroyed by stack unwinding exits with an exception, terminate()
is called.
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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Alf P. Steinbach
Guest
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| Posted: Thu Aug 18, 2005 3:46 pm Post subject: Re: why these program terminate abnormally |
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* kunal:
| Quote: | [homework with specially crafted example code]
|
See FAQ item 5.2,
<url: http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.2>.
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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