c-resources/CPlusPlus20ForProgrammers-m.../examples/ch10/fig10_46/fig10_46.cpp

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// fig10_46.cpp
// Attempting to polymorphically call a function that is
// inherited from each of two base classes.
#include <iostream>
// class Base definition
class Base {
public:
virtual void print() const = 0; // pure virtual
};
// class DerivedOne definition
class DerivedOne : public Base {
public:
// override print function
void print() const override {std::cout << "DerivedOne\n";}
};
// class DerivedTwo definition
class DerivedTwo : public Base {
public:
// override print function
void print() const override {std::cout << "DerivedTwo\n";}
};
// class Multiple definition
class Multiple : public DerivedOne, public DerivedTwo {
public:
// qualify which version of function print
void print() const override {DerivedTwo::print();}
};
int main() {
Multiple both{}; // instantiate a Multiple object
DerivedOne one{}; // instantiate a DerivedOne object
DerivedTwo two{}; // instantiate a DerivedTwo object
Base* array[3]{}; // create array of base-class pointers
array[0] = &both; // ERROR--ambiguous
array[1] = &one;
array[2] = &two;
// polymorphically invoke print
for (int i{0}; i < 3; ++i) {
array[i] ->print();
}
}
/**************************************************************************
* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
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* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
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**************************************************************************/