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// Display X, Y, Z coordinates (three_d's inserter) ostream &operator<<(ostream &stream, three_d obj) { stream << objx << ", "; stream << objy << ", "; stream << objz << "\n"; return stream; // return the stream }

Figure 19.8 Wipe effect with a slight trailing edge. By varying the begin time of the animation, you can alter the size of the edge.

Many of the features in this function are common to all inserter functions First, notice that it is declared as returning a reference to an object of type ostream This is necessary to allow several insertion operations to be performed in a single statement Next, the function has two parameters The first is the reference to the stream that occurs on the left side of the << operator; the second parameter is the object that occurs on the right side Inside the function, the three values contained in an object of type three_d are output, and stream is returned Here is a short program that demonstrates the inserter:

#include <iostream> using namespace std; class three_d { public:

Multiple Services on One Network (Not Just Ethernet)

In listing 19.13, we have two triggers: one going from ElementA to ElementB h and one going from ElementB to ElementA c. This dramatically increases the amount of XAML. Doubles it, you might say. Not only that, but if you have to fix something, you have to fix it in two places. Normally, we d go to extraordinary effort to be able to reuse the same XAML. There are two different approaches to this:

int x, y, z; // 3-d coordinates three_d(int a, int b, int c) { x=a; y=b; z=c; } } ; // Display X, Y, Z coordinates - three_d inserter ostream &operator<<(ostream &stream, three_d obj) { stream << objx << ", "; stream << objy << ", "; stream << objz << "\n"; return stream; // return the stream } int main() { three_d a(1, 2, 3), b(3, 4, 5), c(5, 6, 7); cout << a << b << c; return 0; }

If you eliminate the code that is specific to the three_d class you are left with the general form of an inserter function, as shown here: ostream &operator<<(ostream &stream, class_type obj ) { // type specific code goes here return stream; // return the stream } What an inserter function actually does is up to you Just make sure that you return stream Also, it is perfectly acceptable indeed, it is common for the obj parameter to be a reference, rather than an object The advantage of passing a reference to the object being output is twofold First, if the object is quite large, it will save time to pass only its address Second, it prevents the object s destructor from being called when the inserter returns You might wonder why the three_d inserter function was not coded like this:

We could modify our ABSwitcher so that, instead of having an ElementA and an ElementB, it had something like a CurrentElement and an OldElement, and we could bind to those. The problem with this approach is that, particularly with more complex effects, it gets tricky to make sure that the elements are properly positioned without getting one or the other element to flash up on the screen. If you re really good at XAML4, you could probably handle this, but it does mean that you ll have to handle it for every type of effect. We could store the effect itself as a resource and then bind the appropriate elements within our control template. The problem with this approach is that it makes the XAML really hard to read. Because the goal of combining the effects is to improve maintainability, we think that this is going in the wrong direction.