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static X IncrA(X obj) { X temp = new X(); tempVal = objVal + 1; return temp; } // This method returns Y and has a Y parameter static Y IncrB(Y obj) { Y temp = new Y(); tempVal = objVal + 1; return temp; } static void Main() { Y Yob = new Y(); // In this case, the parameter to IncrA // is X and the parameter to ChangeIt is Y // Because of contravariance, the following // line is OK ChangeIt change = IncrA; X Xob = change(Yob); ConsoleWriteLine("Xob: " + XobVal); // In the next case, the return type of // IncrB is Y and the return type of // ChangeIt is X Because of covariance, // the following line is OK change = IncrB; Yob = (Y) change(Yob); ConsoleWriteLine("Yob: " + YobVal); } }

Note that a rotating cam contacting an oscillating curved-face follower has a quadric equivalent mechanism The same cam mechanism (except that the follower has a at face) may be replaced by a slider-plane equivalent mechanism

The output from the program is shown here:

Part III:

Xob: 1 Yob: 1

Now we shall use a circular arc cam but with a at-faced follower In Fig 1413 we see the Scotch yoke equivalent mechanism As before there are two different equivalent

In the program, notice that class Y is derived from class X Next, notice that the delegate ChangeIt is declared like this:

In scheduling the second, dependent report, you must tell it to wait for the event Sales Query Completed

delegate X ChangeIt(Y obj);

Once you have scheduled a document to refresh, you can see the status and history of each schedule From within the InfoView document list, select History If you want to delete a particular instance, check the desired box and click the Delete button

ChangeIt returns X and has a Y parameter Next, notice that the methods IncrA( ) and IncrB( ) are declared as shown here:

FIGURE 1413 Circular arc cam translating at-faced follower (nose action)

static X IncrA(X obj) static Y IncrB(Y obj)

18:

Part I:

mechanisms for each arc of contact K0K1 and K1K2 For example, in contact on nose arc K1K2 Fig 1413a, the center of curvature B2 gives an equivalent mechanism having a crank length E2 Section 147 indicates the method for nding the cam proportions, and Eqs (149), (1410), and (1411) should be employed to determine the follower characteristics

The IncrA( ) method has an X parameter and returns X The IncrB( ) method has a Y parameter and returns Y Given covariance and contravariance, either of these methods can be passed to ChangeIt, as the program illustrates Therefore, this line

After a certain period of inactivity, your InfoView session may time out For security reasons, though, it is best to log out when you are finished working with BusinessObjects XI If your InfoView preferences have each document open in a separate browser window, first close these additional windows Then, from the InfoView Header panel, select Log Off, the yellow padlock button (see Table 17-1 in 17)

ChangeIt change = IncrA;

Figure 1414 shows a ball and groove follower cam mechanism that is used in a lightly loaded mechanism such as a sewing machine at speeds from 2000 to 3000 rpm The cam groove C is a closed track cam utilizing a ball follower A round arm A has a sliding t in the hole of the ball and is fastened to shaft D, which is the output shaft The ball follower runs in the groove of the closed track follower, imparting oscillating motion to output member A and shaft D This cam follower mechanism is easy to fabricate

uses contravariance to enable IncrA( ) to be passed to the delegate because IncrA( ) has an X parameter, but the delegate has a Y parameter This works because, with contravariance, if the parameter type of the method passed to a delegate is a base class of the parameter type used by the delegate, then the method and the delegate are compatible The next line is also legal, but this time it is because of covariance:

documents, you will receive the following error message from within the document browser:

change = IncrB;

Many hand tools provide mechanical advantage Examples are pliers, scissors, car jacks, and bolt cutters They all have a design restriction in that the amount of leverage is dependent on the length of the handles A spiral cam can be a proper choice to provide the nec-

In this case, the return type of IncrB( ) is Y, but the return type of ChangeIt is X However, because the return type of the method is a class derived from the return type of the delegate, the two are compatible

Part III:

All delegates are classes that are implicitly derived from SystemDelegate You don t normally need to use its members directly, and this book makes no explicit use of SystemDelegate However, its members may be useful in certain specialized situations

FIGURE 1415 Spiral-cam cutting mechanism (rachet driven)