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Page xiv Hour 18 Advanced Polymorphism 281 Problems with Single Inheritance 281 Abstract Data Types 286 Pure Virtual Functions 289 Complex Hierarchies of Abstraction 294 Which Types Are Abstract? 298 Summary 299 Q&A 299 Hour 19 Linked Lists 301 Linked Lists and Other Structures 301 A Case Study 303 Delegation of Responsibility 303 The Component Parts 304 What Have You Learned, Dorothy? 313 Summary 313 Q&A 314 Part VI Special Topics 315 Hour 20 Special Classes and Functions 317 Static Member Data 317 Static Member Functions 320 Containment 322 Accessing Members of the Contained Class 328 Filtering Access to Contained Members 328 The Cost of Containment 328 Copying by Value Versus by Reference 328 Friend Classes 329 Friend Functions 330 Pointers to Functions 330 Shorthand Invocation 333 Arrays of Pointers to Functions 333 Passing Pointers to Functions to Other Functions 335 Using typedef with Pointers to Functions 338 Pointers to Member Functions 340 Arrays of Pointers to Member Functions 342 Summary 344 Q&A 345
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