catching exceptions

[Samuele Armondi]

Hi everyone,
I vaguely recall someone mentioning that exceptions should be caught as
const in order to avoid unnecessary copying, i.e.
try
{
// blah
}
catch (const exception e)
{
//deal with it
}
Is this the case? If so, why does const stop the object from being copied?
Thanks in advance,
S. Armondi

 

[Victor Bazarov]

I vaguely recall someone mentioning that exceptions should be caught as
const in order to avoid unnecessary copying, i.e.
try
{
// blah
}
catch (const exception e)
{
//deal with it
}
Is this the case? If so, why does const stop the object from being copied?

It doesn't. You probably want them to be caught by reference:

catch (const exception & e)
{
// deal with it
}

Victor

 

[Samuele Armondi]

copied?

It doesn't. You probably want them to be caught by reference:

catch (const exception & e)
{
// deal with it
}

Victor

Ok, thanks for the info. I probably just misread it!

 

[Ron Natalie]

Hi everyone,
I vaguely recall someone mentioning that exceptions should be caught as
const in order to avoid unnecessary copying, i.e.
try
{
// blah
}
catch (const exception e)
{
//deal with it
}

Not const, but reference (which may also be const).

catch(exception& e) { ...