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Contains the Rectangle example shown in Figures 52, and 54-56 Contains both the Cref and Pointer classes Illustrates the problem with dual-direction implicit type conversions, shown in Figure 58 To see the problem, you must remove the explicit directive in the Pointer constructor in Wrapperh To see the fix, you must be using a compiler that understands explicit (some simply ignore it) Contains an implementation of ~ u t PO int er, o shown in Figure 59, and a test program Contains the storagecell adapter, shown in Figure 51 1 Tests the Storagecell adapter, as shown in Figure 512 Contains the complete iterator class and a test program, as shown in Section 541 Contains the complete iterator class and a test program, as shown in Section 542 Contains the complete iterator class and a test program, as shown in Section 543 Contains the pair class shown in Figure 520 Contains the complete set of classes and a test program for the Observer pattern discussed in Section 56
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Exercises
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In Short
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51 What is a design pattern 52 Describe how function objects are implemented in C++ 53 Explain the Adapter and Wrapper patterns How do they differ 54 What are two common ways to implement adapters What are the trade-offs between these implementation methods
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55 Describe in general the a lterator pattern b Observer pattern
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56 Give an example of the Observer pattern that is not discussed in the text Use a real-life example rather than a programming example
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57 A class is abstract if it has at least one abstract method The subject class presented in Figure 521 is therefore not abstract A littleknown feature of C++ allows abstract methods to have an implementation; this feature is primarily used on the destructor Verify that this feature exists by making the subject destructor a pure virtual function while leaving its implementation in tact
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58 Templates can be used to write generic function objects a Write a class template function object named lessIn the class template, overload operator ( ) to call the operator< for its two Comparable parameters b Rewrite the f indMax function template in Figure 51 to call the f indMax functjon template shown in Figure 54 Your rewrite may contain only one line in the function body: a call to the two-parameter findMax that sends a compatible function object from part (a) c Instead of writing a separate one-parameter f indMax,can you simply rewrite the two-parameter f indMax function template shown in Figure 54 to accept a default parameter that is a compatible function object from part (a) Verify your answer by compiling code
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59 Write a generic countMatches function that takes two parameters The first parameter is an array of intThe second parameter is a function object that returns a Boolean a The method countMatches returns the number of array items for which the function object returns true Implement countMatches b Test countMatches by writing a function object EqualsZero that overloads operator ( ) to accept one parameter and returns
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true if the parameter is zero Use an EqualsZero function object to test countMatches c Rewrite countMatches (and ~quals~ero) using templates by
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510 Although the function objects that we looked at store no data, that is not a requirement a Write a function object EqualsK that contains one data member, k The EqualSK object is constructed with a single parameter (default is zero) used to initialize k Its one parameter operator ( ) returns true if the parameter equals k b Use EqualsK to test countMatches in Exercise 59 (if you did part (c), make EqualsK a template) 511 Add operator* and operator-> to the Pointer class template in Figure 57 512 Is it safe to apply insertionsort (Figure 34) to a vector of auto-ptr objects 513 The s torageclass adapter is implemented by private inheritance Redo the implementation shown in Figure 51 I , using composition Test your program by calling a significant number of storageclass methods Is there a significant difference in speed 514 Add both the previous and hasprevious methods to a Iterator design #I (Section 541) b Iterator design #3 (Section 543) 515 In Java, iterator design #I (Section 541) is an Enumeration Assume that only design #2 has been written and that you want to write an iterator that follows the Enumeration interface a What pattern describes the problem that you are trying to solve b Write the class, using the name Enumeration,in terms of the iterator defined in design #2 Add a getEnumeration method to MyVector to do so
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