?? purevirtualdefinitions.cpp
字號:
//: C15:PureVirtualDefinitions.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
// Pure virtual base definitions
#include <iostream>
using namespace std;
class Pet {
public:
virtual void speak() const = 0;
virtual void eat() const = 0;
// Inline pure virtual definitions illegal:
//! virtual void sleep() const = 0 {}
};
// OK, not defined inline
void Pet::eat() const {
cout << "Pet::eat()" << endl;
}
void Pet::speak() const {
cout << "Pet::speak()" << endl;
}
class Dog : public Pet {
public:
// Use the common Pet code:
void speak() const { Pet::speak(); }
void eat() const { Pet::eat(); }
};
int main() {
Dog simba; // Richard's dog
simba.speak();
simba.eat();
} ///:~
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