dyn_cast.cpp
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#include <iostream.h>
#include <typeinfo.h>
class Base1
{
virtual void f(void) { /* A virtual function makes the class polymorphic */ }
};
class Base2 { };
class Derived : public Base1, public Base2 { };
void main(void)
{
try
{
Derived d, *pd;
Base1 *b1 = &d;
// Perform a downcast from a Base1 to a Derived.
if ((pd = dynamic_cast<Derived *>(b1)) != 0)
{
cout << "The resulting pointer is of type "
<< typeid(pd).name() << endl;
}
else throw Bad_cast();
// Cast from the first base to the most derived class and then back
// to another accessible base.
Base2 *b2;
if ((b2 = dynamic_cast<Base2 *>(b1)) != 0)
{
cout << "The resulting pointer is of type "
<< typeid(b2).name() << endl;
}
else throw Bad_cast();
}
catch (Bad_cast)
{
cout << "dynamic_cast failed" << endl;
exit(1);
}
catch (...) {
cout << "Exception handling error." << endl;
exit(1);
}
}
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