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145 Details
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Template specializations look like the template definitions that they are specializing, but they omit one or more of the type parameters, replacing them with specific types instead The myriad uses of template specializations are beyond the scope of this book, but you should know that they exist, and that they are useful for making decisions about types during compilation
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Exercises
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14-0 Compile, execute, and test the programs in this chapter 14-1 Implement the comparison operation that operates on Ptr<Core> 14-2 Implement and test the student grading program using Ptr<Core> objects 14-3 Implement the Student_info class to use the final version of Ptr, and use that version to implement the grading program from 135/247 14-4 Reimplement the Str class to use the final version of Ptr 14-5 Test the reimplemented Str class by recompiling and rerunning programs that use Str, such as the version of split and the picture operations that use a Vec<Str> 14-6 The Ptr class really solves two problems: maintaining reference counts, and allocating and deallocating objects Define a class that does reference counting and nothing else; then use that class to reimplement the Ptr class
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Inheritance is most useful in modeling large, complex systems, which are well beyond the scope of any introductory book One of the reasons that we are so fond of the character- picture example that we introduced in 58/91 is that such pictures lend themselves to an object-oriented solution, yet we can implement them in only a few hundred lines of code We have used this example for many years, refining our code and simplifying the presentation In reviewing the example for this book, we were able to remove nearly half the code by using the standard library and our generic handle class from 14 In 58/91, we wrote several functions that represented a character picture as a vector<string>, a strategy that entailed copying characters whenever we constructed a new picture Copying all those characters wastes time and space For example, if we were to concatenate two copies of a picture, we would then store three copies of each character: one for the original, and one for each side of the newly concatenated picture Even more important, the solution in 58/91 discards all structural information about the pictures We have no idea how a given picture was formed It might have been the initial input from our user, or it might have been created by applying one or more operations to simpler pictures Some potentially useful operations require preserving a picture's structure For example, if we want to be able to change the frame characters in a picture, we can do so only if we know which components of a picture were framed and which ones were not We cannot look only for instances of the frame characters, because these characters might, coincidentally, have been part of an initial input picture As we'll see in this chapter, by using inheritance and our generic handle class, we will be able to preserve the structural information inherent in a picture, while at the same time reducing the space consumption of our system dramatically
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151 Design
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We are trying to solve two distinct problems One is a design problem we'd like to keep structural information about how a picture was created The other is an implementation problem we want to store fewer copies of the same data Both problems result from our decision to store a picture as a vector<string>, so we must revisit that decision We can solve the implementation problem by managing our data with the Ptr class that we developed in 14 That class will let us store the actual character data in a single object, and then arrange for multiple pictures to share that same object For example, if we frame a given picture, we will no longer have to copy the characters of the picture that we're framing Instead, class Ptr will manage a reference count associated with the data, which will indicate how many other pictures are using those data The design problem is harder to solve Each picture that we create has a structure, which we want to retain We form a picture either from an initial collection of characters, or through one of three operations: frame, to produce a framed picture; and hcat or vcat, to create pictures that are concatenated horizontally or vertically In other words, we have four similar kinds of pictures Despite their similarity, we create them differently, and we would like to keep track of the differences
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