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chained exception

 
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josh
Guest
PostPosted: Wed May 16, 2007 9:10 am    Post subject: chained exception Reply with quote


Hi,
is there a standard way to "read" an exception rethrowed by a catch
and catch in an another extern try/catch?

Thanks
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comp.lang.c++
Guest
PostPosted: Wed May 16, 2007 9:10 am    Post subject: Re: chained exception Reply with quote


i thank,so
"josh" <xdevel1999 (AT) gmail (DOT) com>
??????:1179302043.101088.112800 (AT) y80g2000hsf (DOT) googlegroups.com...
Quote:
Hi,
is there a standard way to "read" an exception rethrowed by a catch
and catch in an another extern try/catch?

Thanks
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peter koch
Guest
PostPosted: Wed May 16, 2007 9:11 am    Post subject: Re: chained exception Reply with quote


On 16 Maj, 09:54, josh <xdevel1...@gmail.com> wrote:
Quote:
Hi,
is there a standard way to "read" an exception rethrowed by a catch
and catch in an another extern try/catch?

Thanks

The idiom is something like this:

void detect_exception()
{
try
{
throw;
}
catch (std::exception const& se)
{
// std::exception thrown
}
catch (myexception const& me)
{
// myexception thrown
}
catch (...)
{
// something else thrown
}
}

/Peter
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Sylvester Hesp
Guest
PostPosted: Wed May 16, 2007 9:11 am    Post subject: Re: chained exception Reply with quote
"josh" <xdevel1999 (AT) gmail (DOT) com> wrote in message
news:1179302043.101088.112800 (AT) y80g2000hsf (DOT) googlegroups.com...
Quote:
Hi,
is there a standard way to "read" an exception rethrowed by a catch
and catch in an another extern try/catch?

Thanks


Sure there is, just use nested try/catch statements

#include <iostream>
int main()
{
try
{
try
{
std::cout << "throwing..." << std::endl;
throw 42;
}
catch(int i)
{
std::cout << "Inner catch: " << i << " - rethrowing..." <<
std::endl;
throw;
}
}
catch(int i)
{
std::cout << "Outer catch: " << i << std::endl;
}
}

Of course, the inner and outer catches don't have to be in the same
function, and the outer catch can rethrow again if deemed necessary.

- Sylvester
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