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The InstrumentedSet class is known as a wrapper class because each InstrumentedSet instance wraps another Set instance This is also known as the Decorator pattern [Gamma98, p175] because the InstrumentedSet class decorates a set by adding instrumentation Sometimes the combination of composition and forwarding is erroneously referred to as delegation Technically, it's not delegation unless the wrapper object passes itself to the wrapped object [Gamma98, p20] The disadvantages of wrapper classes are few One caveat is that wrapper classes are not suited for use in callback frameworks, wherein objects pass self-references to other objects for later invocations ( callbacks ) Because the wrapped object doesn't know of its wrapper, it passes a reference to itself (this) and callbacks elude the wrapper This is known as the SELF problem [Lieberman86] Some people worry about the performance impact of forwarding method invocations or the memory footprint impact of wrapper objects Neither of these things turns out to have much impact in practice It is a bit tedious to write forwarding methods, but the tedium is partially offset by the fact that you have to write only one constructor Inheritance is appropriate only in circumstances where the subclass really is a subtype of the superclass In other words, a class B should extend a class only A if an is-a relationship exists between the two classes If you are tempted to have a class B extend a class A, ask yourself the question: Is every B really an A If you cannot truthfully answer yes to this question, B should not extend A If the answer is no, it is often the case that B should contain a private instance of A and expose a smaller and simpler API: A is not an essential part of B, merely a detail of its implementation

public class FavoritesConnection { private final BasicFavoriteItem source; private final IResource target; public FavoritesConnection(BasicFavoriteItem item, IResource resource) { thissource = item; thistarget = resource; } public BasicFavoriteItem getBasicFavoriteItem() { return source; } public IResource getResource() { return target; } }

Moreover, whenever ordinary integers and unsigned integers combine in an expression, the ordinary integer is converted to unsigned In consequence, expressions such as homeworksize() - 100 yield unsigned results, which means that they, too, cannot be less than zero even if homeworksize() < 100

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Connections visually link a source and a target Edit parts that have connections must return those connection model objects by overriding the getModelSourceConnections() and getModelTargetConnections() methods Each connection model object must be returned by exactly one edit part s getModelSourceConnections() method and exactly one edit parts s getModelTargetConnections() method In our case, the source of each connection is an instance of BasicFavoriteItemEditPart Add the following field and method to BasicFavoriteItemEditPart

private final List<FavoritesConnection> modelSourceConnections; protected List<FavoritesConnection> getModelSourceConnections() { return modelSourceConnections; }

Finally, it is also worth noting that the execution performance of our program is actually quite good, even though the vector<double> object grows as needed to accommodate its input, rather than being allocated with the right size immediately

public BasicFavoriteItemEditPart(BasicFavoriteItem item) { setModel(item); IResource res = (IResource) itemgetAdapter(IResourceclass); modelSourceConnections = new ArrayList<FavoritesConnection>(1); modelSourceConnectionsadd(new FavoritesConnection(item, res)); }

Overriding the equals method seems simple, but there are many ways to get it wrong, and the consequences can be dire The easiest way to avoid problems is not to override the equals method, in which case each instance is equal only to itself This is the right thing to do if any of the following conditions apply:

We can be confident about the program's performance because the C++ standard imposes performance requirements on the library's implementation Not only must the library meet the specifications for behavior, but it must also achieve well-specified performance goals Every standard-conforming C++ implementation must

While BasicFavoriteItemEditPart always has exactly one source connection, ResourceEditPart can have multiple target connections Add the following field and method to ResourceEditPart The field content will be modified by methods later in this section

private final List<FavoritesConnection> modelTargetConnections = new ArrayList<FavoritesConnection>(); protected List<FavoritesConnection> getModelTargetConnections() { return modelTargetConnections; }

Implement vector so that appending a large number of elements to a vector is no worse than proportional to the number of elements

public class FavoriteConnectionEditPart extends AbstractConnectionEditPart { public FavoriteConnectionEditPart(FavoritesConnection connection) { setModel(connection); } protected void createEditPolicies() { // none } }

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