**Note:**- It is especially useful when one has to specify a function A as a parameter for another function B. If B is set so that its argument shall be a functor, then it can take indifferently a simple function or a functor as parameter. The reciprocal would not be true.
Functors are great when one wants to make use of parametrized functions: thanks to the functor's constructor, one can generate numerous different functions at runtime.

`Functor * myAdd = new addFunctor( 5 )`

: myAdd is a dynamically created function.

**See also:**- Ceylan::Maths::IntToIntFunctor for a complete example.

**Note:**- Each child class should define following operator: virtual 'returned type' operator() ('parameter') throw()

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