05-multipleinheritance

05-multipleinheritance - CS4240 AaronBloomfield...

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Click to edit Master subtitle style CS 4240 Principles of Software Design Aaron Bloomfield Multiple Inheritance & Interfaces Fall 2009
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Click to edit Master subtitle style 22 Motivation for multiple inheritance  (MI)
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33
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44 Review: overloading vs. overriding n Overloading class foo { void bar () { … } void bar (int a) { … } void bar (float f) { … } void bar (int a, int b)  { … } } Overriding void bar() { … } } class q uz : public foo { void bar() { … }
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55 Motivation n UVSphere extends Shape n But it also needs to extend Subject n And Aggregate (from the Iterator pattern) n For iterating through the points/faces/edges n And others n With multiple inheritance: class UVSphere : public Shape, public Subject,  public Aggregate { // ...
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66 Using MI for Observers n Now, the following method prototype: n public void Update (Subject* theChagnedSubject); n Can take in any UVSphere
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77 Problems with multiple inheritance class A { void foo(); } class B { void foo(); } class C: public A, public B { // which foo() does it use? }
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88 More problems class A { void foo(); } class B { int  foo(); } class C: public A, public B { // what is the return type of foo()? }
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99 Even more problems n Consider this class diagram: n gp_list_node is an ancestor class twice!!! As is person gp_list_n ode pers on studen t gp_list_nod e student_pr of professo r
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Click to edit Master subtitle style 1010 Multiple inheritance details
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1111 Multiple Inheritance n Derived class with two or more base classes n E.g. - Student class n C++: class student : public person, public gp_list_node { … }
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1212 Languages supporting MI n Supported in C++, Eiffel, CLOS n Single 
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