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We form the name of an overloaded operator by appending the operator symbol to the word operator Thus, the function we need to define will be called operator[] The kind of operator whether it is a unary or binary operator is part of what determines how many parameters the corresponding function has It the operator is a function that is not a member, then the function has as many arguments as the operator has operands The first argument is bound to the left operand; the second is bound to the right operand If the operator is defined as a member function, then its left operand is implicitly bound to the object on which the operator is invoked Member operator functions, therefore, take one less argument than the operator indicates In general, operator functions may be member or nonmember functions However, the index operator is one of a handful of operations that must be member functions When our user writes an expression such as vs[i], that expression will call the member named operator[] of vs, passing i as its argument We know that the operand must be an integral type large enough to denote the last element in the largest possible Vec, and that this type is Vec::size_type What remains is to decide what type the index operator should return If we give it a bit of thought, we'll conclude that we should return a reference to the element stored in the Vec Doing so will allow users to write through the index as well as read from it Although our sample program uses the index only to read a value from vs, it is reasonable to expect that users will also want write access to the elements With this analysis complete, we can update our class appropriately:

Adding the capability for a user to undo and redo commands involves separating user edits into commands visible in the user interface and the underlying operations that can be executed, undone, and redone Typically each command will instantiate a new operation every time the user triggers that

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While this program is just a toy, the technique that it demonstrates is very powerful The toy program could easily be turned into a generic set tester that validates the specified Set implementation by aggressively manipulating one or more instances and checking that they obey the Set contract Similarly, it could be turned into a generic set performance analysis tool In fact, the technique that it demonstrates is sufficient to implement a full-blown service provider framework (Item 1) Most of the time, this technique is all that you need in the way of reflection You can see two disadvantages of reflection in the example First, the example is capable of generating three run-time errors, all of which would have been compile-time errors if reflective instantiation were not used Second, it takes twenty lines of tedious code to generate an instance of the class from its name, whereas a constructor invocation would fit neatly on a single line These disadvantages are, however, restricted to the part of the program that instantiates the object Once instantiated, it is indistinguishable from any other Set instance In a real program, the great bulk of the code is thus unaffected by this limited use of reflection A legitimate, if rare, use of reflection is to break a class's dependencies on other classes, methods, or fields that may be absent at run time This can be useful if you are writing a package that must run against multiple versions of some other package The technique is to compile your package against the minimal environment required to support it, typically the oldest version, and to access any newer classes or methods reflectively To make this work, you have to take appropriate action if a newer class or method that you are attempting to access does not exist at run time Appropriate action might consist of using some alternate means to accomplish the same goal or operating with reduced functionality.

command The command gathers the current application state, such as the currently selected elements, and the operation caches that state so that it can be executed, undone, and redone independent of the original command An instance of IOperationHistory manages the operations in the global undo/redo stack (see Figure 8 10) Each operation uses one or more associated undo/redo contexts to keep operations for one part separate from operations for another

template <class T> class Vec { public: typedef T* iterator; typedef const T* const_iterator; typedef size_t size_type; typedef T value_type; Vec() { create(); } explicit Vec(size_type n, const T& val = T()) { create(n, val); } // new operations: size and index size_type size() const { return limit - data; } T& operator[](size_type i) { return data[i]; } const T& operator[](size_type i) const { return data[i]; } private: iterator data; iterator limit; };

In this case, you need to split the DeletePropertiesHandler (see Section 8513, Creating commands, on page 383), moving some functionality into a new DeletePropertiesOperation class The AbstractOperation superclass implements much of the required IUndoableOperation interface

public class DeletePropertiesOperation extends AbstractOperation { private final PropertyElement[] elements; public DeletePropertiesOperation( PropertyElement[] elements ) { super(getLabelFor(elements)); thiselements = elements; }

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