Bjarne Stroustrup “Programming Principles and Practice Using C++”
Chapter 14 Drill 5
Using std_lib_facilities.h by Bjarne Stroustrup.
[code language=”cpp”]
// Philipp Siedler
// Bjarne Stroustrup’s PP
// Chapter 14 Drill 5
#include "std_lib_facilities.h"
using namespace std;
class B1
{
public:
virtual void vf() { cout << "B1::vf" << endl; }
void f() { cout << "B1::f" << endl; }
virtual void pvf() = 0;
};
class D1 : public B1
{
public:
void vf() { cout << "D1::vf" << endl; }
void f() { cout << "D1::f" << endl; }
void pvf() { cout << "D1::pvf" << endl; }
};
void call(B1& b1_ref) {
b1_ref.f();
b1_ref.vf();
b1_ref.pvf();
}
int main()
try
{
cout << "drill 1" << endl;
//B1 b1;
//b1.f();
//b1.vf();
cout << "not allowed, B1::pvf is a pure virtual function" << endl;
cout << "drill 2" << endl;
D1 d2;
d2.f();
d2.vf();
d2.pvf();
cout << "drill 3" << endl;
D1 d3;
call(d3);
keep_window_open();
}
catch (exception& e) {
cout << e.what() << endl;
return 1;
}
catch (…) {
cout << "Exiting" << endl;
return 2;
}
[/code]
Output: drill 1 not allowed, B1::pvf is a pure virtual function drill 2 D1::f D1::vf D1::pvf drill 3 B1::f D1::vf D1::pvf Please enter a character to exit
