5. Overdefinition of operators
C++ lets you over-define existing operators, i.e. give them a new meaning when they relate (in whole or in part) to objects of class type.
5.1 Mechanism
To override an existing operator op, define a function named operator op (you can put one or more spaces between the word operator and the operator, but you don't have to):
or as an independent function (usually a friend of one or more classes);
or as a class member function.
In the first case, if op is a binary operator, the notation a op b is equivalent to :
operator op (a, b)
In the second...
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Overdefinition of operators
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