Marcio Faustino wrote:
Hi,
Hello,
Can the defined operator/function be overridden?
perldoc -f prototype
prototype FUNCTION
Returns the prototype of a function as a string (or "undef" if the
function has no prototype). FUNCTION is a reference to, or the
name of, the function whose prototype you want to retrieve.
If FUNCTION is a string starting with "CORE::", the rest is taken
as a name for Perl builtin. If the builtin is not overridable
(such as "qw//") or its arguments cannot be expressed by a
prototype (such as "system") returns "undef" because the builtin
does not really behave like a Perl function. Otherwise, the
string describing the equivalent prototype is returned.
So a function like 'open' can be overridden:
$ perl -le' print prototype "CORE::open"'
*;$@
But it looks like 'defined' cannot:
$ perl -le' print prototype "CORE::defined"'
John
--
Perl isn't a toolbox, but a small machine shop where you
can special-order certain sorts of tools at low cost and
in short order. -- Larry Wall
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