73 lines
1.7 KiB
C++
73 lines
1.7 KiB
C++
|
// rtti2.cpp -- using dynamic_cast, typeid, and type_info
|
||
|
#include <iostream>
|
||
|
#include <cstdlib>
|
||
|
#include <ctime>
|
||
|
#include <typeinfo>
|
||
|
using namespace std;
|
||
|
|
||
|
class Grand
|
||
|
{
|
||
|
private:
|
||
|
int hold;
|
||
|
public:
|
||
|
Grand(int h = 0) : hold(h) {}
|
||
|
virtual void Speak() const { cout << "I am a grand class!\n";}
|
||
|
virtual int Value() const { return hold; }
|
||
|
};
|
||
|
|
||
|
class Superb : public Grand
|
||
|
{
|
||
|
public:
|
||
|
Superb(int h = 0) : Grand(h) {}
|
||
|
void Speak() const {cout << "I am a superb class!!\n"; }
|
||
|
virtual void Say() const
|
||
|
{ cout << "I hold the superb value of " << Value() << "!\n";}
|
||
|
};
|
||
|
|
||
|
class Magnificent : public Superb
|
||
|
{
|
||
|
private:
|
||
|
char ch;
|
||
|
public:
|
||
|
Magnificent(int h = 0, char cv = 'A') : Superb(h), ch(cv) {}
|
||
|
void Speak() const {cout << "I am a magnificent class!!!\n";}
|
||
|
void Say() const {cout << "I hold the character " << ch <<
|
||
|
" and the integer " << Value() << "!\n"; }
|
||
|
};
|
||
|
|
||
|
Grand * GetOne();
|
||
|
int main()
|
||
|
{
|
||
|
srand(time(0));
|
||
|
Grand * pg;
|
||
|
Superb * ps;
|
||
|
for (int i = 0; i < 5; i++)
|
||
|
{
|
||
|
pg = GetOne();
|
||
|
cout << "Now processing type " << typeid(*pg).name() << ".\n";
|
||
|
pg->Speak();
|
||
|
if( ps = dynamic_cast<Superb *>(pg))
|
||
|
ps->Say();
|
||
|
if (typeid(Magnificent) == typeid(*pg))
|
||
|
cout << "Yes, you're really magnificent.\n";
|
||
|
}
|
||
|
// std::cin.get();
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
Grand * GetOne()
|
||
|
{
|
||
|
Grand * p;
|
||
|
|
||
|
switch( rand() % 3)
|
||
|
{
|
||
|
case 0: p = new Grand(rand() % 100);
|
||
|
break;
|
||
|
case 1: p = new Superb(rand() % 100);
|
||
|
break;
|
||
|
case 2: p = new Magnificent(rand() % 100, 'A' + rand() % 26);
|
||
|
break;
|
||
|
}
|
||
|
return p;
|
||
|
}
|