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Postings from March 2008
On Fri, Mar 21, 2008 at 05:27:04PM +0100, Abigail wrote:
> Inspecting $@ to check whether an eval die()d is wrong. It can
> trigger both false positives, and false negatives:
>
> [snip]
>
> The correct way of checking whether an eval failed is to check its return
> value:
>
> [snip]
The documentation for eval should probably be updated...
perldoc -f eval
[...]
If there is a syntax error or runtime error, or a die statement is
executed, an undefined value is returned by eval, and $@ is set to the
error message. If there was no error, $@ is guaranteed to be a null
string. [...]
[...]
# make divide-by-zero nonfatal
eval { $answer = $a / $b; }; warn $@ if $@;
[etc.]
Ronald
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