Category 

Operators, C++-Specific Keywords 

Syntax  

operator <operator symbol>( <parameters> )
{
<statements>;
}

Description 

Use the operator keyword to define a new (overloaded) action of the given operator. When the operator is overloaded as a member function, only one argument is allowed, as *this is implicitly the first argument. 

When you overload an operator as a friend, you can specify two arguments.