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The Arrow Operator
``->'' is an infix dereference operator, just as it is in C 
and C++. If the right side is either a [...], {...}, or a 
(...) subscript,

then the left side must be either a hard or symbolic 
reference to an array, a hash, or a subroutine respectively.
(Or technically speaking, alocation capable of holding a 
...
subroutine reference, and the left side must be either an 
object (a blessed reference) or a class name (that is, a 
package name). See the perlobj manpage.