| DoubleFunction | Interface that represents a function object: a function that takes a single argument and returns a single value. | code | html |
| FloatFunction | Interface that represents a function object: a function that takes a single argument and returns a single value. | code | html |
| ObjectObjectProcedure | Interface that represents a procedure object: a procedure that takes two arguments and returns a 'continue' flag. | code | html |
| ObjectProcedure | Interface that represents a procedure object: a procedure that takes a single argument and does not return a value. | code | html |