Re: Introspect whether setCharacterEncoding is present..

=?iso-8859-1?Q?Endre_St=F8lsvik?= <[email protected]> writes:

> |
> | - there is a computation cost to throwing them
> |   Though exceptions are often highly optimized, depsite what some people
> |   in that google search seem to think. This is because most VMs are
> |   written in C and an exception can be implemented as a
> |   longjmp. Certainly, unix longjmp's are very fast.
> 
> longjump or not - that's NOT the question! They have to be allocated, and
> -filled in-. That is the problem. Not the control flow as such.

Yes... but everything has to be allocated. The jmp_buf in C has to be
alloced. There is still a cost in C. Java is about making allocation
easier, not more expensive. It's actually de-allocation that costs
more than it does in C and the cost is amortized over the life of the
VM.

 
> | - there is no other non-local exit feature
> |   Unlike in C++ which still has longjmp left over from C.
> 
> Use booleans and ifs. Unless it is in a non-critical path, then do
> whatever you like. However, in a non-critical path, one may write how bad
> code one desires, as it'll execute very seldom.

Rubbish. You can't use booleans and ifs to do non-local exits.

Sometimes an application has a critical path that requires non-local
exits.


> The time it takes to =make the Exception=, which wasn't mentioned in your
> list!

The reason it wasn't in the list is that it's not a factor. All
allocation has roughly equal cost.


-- 
Nic Ferrier
http://www.tapsellferrier.co.uk


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