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Function Objects

A function object, or functor, is an object that can be called using an ordinary function call. It can be a pointer to a function or an object with a member function operator(). For example, object sine is a function object: struct sine{
  double operator(double x) {return sin(x);}

because if my_sine is of type sine, my_sine can be called by: my_sine(x) and return sin(x), just as if my_sine was a function.