Overdefinition of operators
Programming in C++ language - Concepts

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 :

In the second...