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Overloading
operators as non-member functions is like
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defining
regular C++ functions.
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Since
they are not part of a class' definition, they can only
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access
the public members. Because of this, non-member
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overloaded
operators are often declared to be friends of the
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class.
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When
we overload operators as non-member functions, all
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operands
must be explicitly specified as formal arguments.
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For
binary operators, either the first or the second must be
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an
object of a class; the other operand can be any type.
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