"Lipska the Kat" <lip...@lipskathekat.com> wrote in message
news:c76dnv778_sw4zvnnz2dnuvz8ukdn...@bt.com...
On 18/07/12 01:46, Andrew Cooper wrote:
if not (you are permitted to do this):
return -EPERM
if not (you've given me some valid data):
return -EFAULT
if not (you've given me some sensible data):
return -EINVAL
return actually_try_to_do_something_with(data)
How would you program this sort of logic with a single return statement?
This is very common logic for all routines for which there is even the
remotest possibility that some data has come from an untrusted source.
someType result = -EINVAL //or your most likely or 'safest' result
if not (you are permitted to do this):
result = -EPERM
if not (you've given me some valid data):
result = -EFAULT
if not (you've given me some sensible data):
result = -EINVAL
else
result = -EDSOMETHING
return result
}
//cohesive, encapsulated, reusable and easy to read
But, it works differently from the above. Perhaps replace some of those "if"
statements with "elif".
The "return" version is handy because it provides a quick escape mechanism
without cluttering up the rest of code with extra variables.
--
Bartc
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