?? namehiding.cpp
字號:
//: C14:NameHiding.cpp
// From Thinking in C++, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 2000
// Copyright notice in Copyright.txt
// Hiding overloaded names during inheritance
#include <iostream>
#include <string>
using namespace std;
class Base {
public:
int f() const {
cout << "Base::f()\n";
return 1;
}
int f(string) const { return 1; }
void g() {}
};
class Derived1 : public Base {
public:
void g() const {}
};
class Derived2 : public Base {
public:
// Redefinition:
int f() const {
cout << "Derived2::f()\n";
return 2;
}
};
class Derived3 : public Base {
public:
// Change return type:
void f() const { cout << "Derived3::f()\n"; }
};
class Derived4 : public Base {
public:
// Change argument list:
int f(int) const {
cout << "Derived4::f()\n";
return 4;
}
};
int main() {
string s("hello");
Derived1 d1;
int x = d1.f();
d1.f(s);
Derived2 d2;
x = d2.f();
//! d2.f(s); // string version hidden
Derived3 d3;
//! x = d3.f(); // return int version hidden
Derived4 d4;
//! x = d4.f(); // f() version hidden
x = d4.f(1);
} ///:~
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