This may prove useful to study: 
my $x;
# unless overloaded, numeric values of two refs to the same thing are 
+equal
{package X; use Carp; sub is_x { carp \$x == \$_[0] ? "ok" : "not ok" 
+}}
X::is_x($x);
X::is_x(++$x);
X::is_x($x++);
X::is_x($x+0);

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In reply to Re: Quantum Weirdness and the Increment Operator by ysth
in thread Quantum Weirdness and the Increment Operator by barrachois

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