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the universe when their changes have been exported This can be particularly aggravating when development occurs across multiple time zones For example, if the designer in Europe finishes the workday and wants to allow the designer on the Pacific coast the ability to make additional changes, the initial designer must unlock the universe when exporting it to the repository To unlock the universe, double-click the universe name; the padlock no longer appears next to the File Name If the initial designer leaves for the day without exporting changes to the universe, the second designer cannot safely make any changes In environments with multiple designers developing and/or maintaining one universe, the universe revision number becomes more important To see the revision number, select from the pull-down menu File | Parameters | Summary tab Notice in the next screen that the revision number is 9 For each revision, the two universe designers have entered notes in the Comments field as to what changes were made in each revision To enter a new line of text in the Comments field, use CTRL-ENTER Designer assigns a new revision number each time the universe is exported to the repository, not necessarily each time the universe has been modified

(261)

For any given class and operator, an operator method can, itself, be overloaded One of the most common reasons for this is to allow operations between a class type and other types of data, such as a built-in type For example, once again consider the ThreeD class To this point, you have seen how to overload the + so that it adds the coordinates of one ThreeD object to another However, this is not the only way in which you might want to define addition for ThreeD For example, it might be useful to add an integer value to each coordinate of a ThreeD object Such an operation could be used to translate axes To perform such an operation, you will need to overload + a second time, as shown here:

Designer provides a safeguard in the event that the second designer tries to make changes on an older version of the universe With each export to the repository, Designer will assign a new revision number In the past, a universe with an older revision number could not be exported to the repository In XI, Designer will warn you but allows you to proceed with the export:

// Overload binary + for ThreeD + int public static ThreeD operator +(ThreeD op1, int op2) { ThreeD result = new ThreeD(); resultx = op1x + op2; resulty = op1y + op2; resultz = op1z + op2; return result; }

No 4 a0 a1 a3 a5 a7 b2 b4 b6 b8 0500000 -0583802 0095326 -0012015 0000491 0000000 0000000 0000000 0000000

Notice that the second parameter is of type int Thus, the preceding method allows an integer value to be added to each field of a ThreeD object This is permissible because, as explained earlier, when overloading a binary operator, one of the operands must be of the same type as the class for which the operator is being overloaded However, the other operand can be of any other type Here is a version of ThreeD that has two overloaded + methods:

15:

9:

// Overload addition for ThreeD + ThreeD, and for ThreeD + int using System;

No 5 0500000 -0543883 0034106 0011519 -0001741 -0002399 0002835 -0001293 0000152

.