Who needs exceptions (was Re: Two languages, too similar, competing in the same space.)
Gerson Kurz
gerson.kurz at t-online.de
Sat Dec 29 11:16:03 EST 2001
On Sat, 29 Dec 2001 19:56:48 +0300, Oleg Broytmann <phd at phd.pp.ru>
wrote:
> Ok, let me call you oldfashioned. Errno chcecking is good in local
>context:
>
> file = open(...)
> if not file: report_error()
>
>But is not so easy to pass errno to upper context. To explain what I mean
>I am writing a pice of code using exceptions:
>
>def top():
> try:
> upper()
> except IOError:
> report_error()
>
>def upper():
> data4 = lower()
> process(data4)
>
>def lower():
> file = open(...)
> retunr file.read(4)
>
>Now please rewrite the code without exceptions, using errno checking.
def top():
if not upper():
return report_error("upper failed()")
def upper():
data = lower()
if data:
process(data)
return 1
def lower():
file = open(...)
if file:
return file.read()
report_error("lower failed()")
So ? After all, C doesn't need it, and I think few C programmers would
call this feature the "most missing", or?
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