1. Re: exception handling
Tommy Carlier wrote:
> Above you see the finally-block: this piece of code is always called, if an
> exception occured or not. It's a place where you put code that really needs
> to be called, like closing files or releasing resources.
The 'finally' clause is the part of try/catch that I found a real pain to
implement in my own interpreter, because it's guaranteed to *always* execute.
For example:
try
...
return
catch
...
return
finally
...
end try
See those 'return' statements? The 'finally' clause is guaranteed to execute
before either 'return' causes control to exit the 'try' clauses. If you have
something like:
try
try
...
catch
...
return
finally
...
end try
catch
...
finally
...
end try
Both 'finally' clauses are guaranteed to execute before the inner 'return' is
executed.
That's not to say that 'finally' is a bad thing - it's not! But it complicates
the implementation of try/catch by just a bit.
-- David Cuny
