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// Limited version - don't use ostream &operator<<(ostream &stream, three_d obj) { cout << objx << ", ";

24:

private private private private private private const const const const const const int int int int int int

cout << objy << ", "; cout << objz << "\n"; return stream; // return the stream }

Table B9 ISO 3166 Country Codes, BD and DVD Regions (continued)

PhotoIndex = 0; AlbumIndex = 1; ErrorIndex = 2; SelectedPhotoIndex = 3; SelectedAlbumIndex = 4; AlbumDirectoryIndex = 5;

In this version, the cout stream is hard-coded into the function Remember that the << operator can be applied to any stream Therefore, you must use the stream passed to the function if it is to work correctly in all cases In the three_d inserter program, the overloaded inserter function is not a member of three_d In fact, neither inserter nor extractor functions can be members of a class This is because when an operator function is a member of a class, the left operand (implicitly passed using the this pointer) is an object of the class that generated the call to the operator function There is no way to change this However, when overloading inserters, the left argument is a stream and the right argument is an object of the class Therefore, overloaded inserters cannot be member functions The fact that inserters must not be members of the class on which they are defined to operate raises a serious question: How can an overloaded inserter access the private elements of a class In the previous program, the variables x, y, and z were made public so that the inserter could access them But, hiding data is an important part of object-oriented programming, and forcing all data to be public is inconsistent with the object-oriented approach However, there is a solution: An inserter can be a friend of a class As a friend of the class, it has access to private data To see an example of this, the three_d class and sample program are reworked here, with the overloaded inserter declared as a friend

With these constants in place, we are ready to discuss adding the actual albums to our tree. 15.3.2 CREATING THE ALBUM NODES The proper way to add nodes to a tree depends somewhat on the size of a tree. For a small set of nodes, it makes sense to add the entire hierarchy of nodes at one time, and then allow the control to manage the nodes as they are expanded and collapsed by the user. For a large hierarchy, adding a huge number of nodes can use up a lot of memory. Imagine if the Windows Explorer program created a TreeNode object for every directory and file on your computer. This would be a lot of nodes on most computers. Instead, applications typically add only the nodes a user initially requires, and then insert additional nodes based on the user s actions. This saves both time and memory, since less work is required to initialize the tree when the application starts, and memory is only allocated as new nodes are added to the tree. In our application, the number of albums present could be few or many. We could create the entire hierarchy all at once as shown in listing 15.1. This requires that we open each album file and iterate through every photograph in every album. Since this could be expensive for a large number of albums, we will not use this method nor discuss this code in any detail. Hopefully, it is instructive to see how the entire hierarchy might be created in a single method.

#include <iostream> using namespace std; class three_d { int x, y, z; // 3-d coordinates - - now private public: three_d(int a, int b, int c) { x=a; y=b; z=c; } friend ostream &operator<<(ostream &stream, three_d obj); } ; // Display X, Y, Z coordinates - three_d inserter ostream &operator<<(ostream &stream, three_d obj) { stream << objx << ", "; stream << objy << ", "; stream << objz << "\n";