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This overloaded C++ operator constrains its two arguments to be equal. In order to be taken into account, this constraint must be added to a model and extracted for an algorithm.
This operator returns IloTrue if the functions
 f1 and f2 are the same. That is,
 IloTrue is returned if they have the same definition interval
 and if they have the same value over time. Note that it compares the content
 of the functions as well as the equality of implementation pointer. See
 also: IloNumToNumStepFunction.
This operator returns IloTrue if the interval lists are the
 same. That is, IloTrue is returned if they have the same
 definition interval and if they contain the same intervals. Note that it
 compares the content of the interval lists as well as the equality of
 implementation pointer. See also: IloIntervalList.
This operator returns IloTrue if the functions are the same.
 That is, IloTrue is returned if they have the same definition
 interval and if they have the same value over time. Note that it compares
 the content of the functions as well as the equality of implementation
 pointer. See also: IloNumToAnySetStepFunction.