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protected: Endangered *_endangered; // };
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If our application is intended to run on multiple platforms, it is useful to encapsulate the platform-dependent information in an abstract class hierarchy The application can then program a platform-independent abstract interface For example, to display our ZooAnimal objects under both UNIX and PCs, we might define a DisplayManager class hierarchy:
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class DisplayManager{ }; class DisplayUnix : public DisplayManager{ }; class DisplayPC : public DisplayManager{ };
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Our ZooAnimal is not a kind of DisplayManager, but rather has an instance of a Display-Manager ZooAnimal contains a DisplayManager object through composition rather than through inheritance Our first question is whether it should be through composition by value or composition by reference Composition by value cannot represent a DisplayManager object through which we can address either an actual DisplayUnix or actual DisplayPC object Only a DisplayManager reference or pointer ZooAnimal data member allows us to manipulate a DisplayManager subtype at run-time That is, only composition by reference supports object-oriented programming (see [LIPPMAN96a] for a detailed explanation) Our second question is how can we decide between declaring the ZooAnimal member to be a Display-Manager reference or pointer 1 If the actual DisplayManager subtype is provided at the creation of the ZooAnimal object, and does not change over the course of the program, only then may a DisplayManager reference member be declared 2 If a lazy allocation strategy is adopted in which the actual DisplayManager subtype is not allocated until an actual attempt to display an object is made, then we must represent the DisplayManager member as a pointer and initialize it to 0 3 If we wish to toggle the display mode during run-time, we must also represent the DisplayManager member as a pointer and initialize it to 0 By toggle we mean to allow the user either to determine or switch among the DisplayManager subtypes as the program executes In practice, of course, it is unlikely that each ZooAnimal subobject of our application requires its own DisplayManager subtype with which to display itself A static ZooAnimal DisplayManager pointer is the most likely design choice in this case
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Exercise 186
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Identify which of the following are type inheritance and which are implementation inheritance
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(a) (b) (c) (d) (e) (f)
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Queue : List EncryptedString : String Gif : FileFormat Circle : Point Dqueue : Queue, List DrawableGeom : Geom, Canvas
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Exercise 187
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Replace our Array member of PeekbackStack in Section 1831 with the standard library deque Write a small program to exercise it
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Exercise 188
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Contrast composition by value with composition by reference Give an example of each use to illustrate your discussion
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Class Scope under Inheritance
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Each class maintains its own scope, within which the names of its members and any nested types are defined (see Sections 139 and 1310 for a detailed discussion) Under inheritance, the scope of the derived class is nested within the scope of its immediate base classes If a name is unresolved within the scope of the derived class, the enclosing base class scope is searched for a definition of the name It is this hierarchical nesting of class scopes under inheritance that allows the members of the base class to be accessed directly as if they are members of the derived class Let's walk through a few examples using single inheritance, then extend the discussion to consider multiple inheritance as well Given the following simplified ZooAnimal class definition,
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class ZooAnimal { public: ostream &print( ostream&) const; // public for exposition purposes only string is_a; int ival; private:: double dval; };
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and the following simplified derived Bear class definition,
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class Bear : public ZooAnimal { public: ostream &print( ostream&) const; int mumble( int ); // public for exposition purposes only string name; int ival; };
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