Question

How to use dynamic_cast with try and catch in C++

Answer 1

#include <typeinfo>
#include <iostream>

using std::cout;
using std::endl;

class Base {
public:
	Base() {};
	virtual ~Base() {}
};

class Derived : public Base {
public:
	Derived() {}
	virtual ~Derived() {}
};

int main() 
{
	Base base;
	Derived derived;

	Base &bref = base;

	try {
		Derived &dr = dynamic_cast<Derived&>(bref);
	}
	catch (const std::bad_cast& e)
	{
		std::cout << e.what() << endl;
	}

	return 0;
}


/*
run:

Bad dynamic_cast!

*/

 

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Answer 2

#include <typeinfo>
#include <iostream>

using std::cout;
using std::endl;

struct A { virtual ~A() {} };
struct B { virtual ~B() {} };

int main()
{
	B b;
	try {
		A &ref = dynamic_cast<A&>(b);
	}
	catch (const std::bad_cast &e)
	{
		cout << e.what() << endl;
	}

	return 0;
}


/*
run:

Bad dynamic_cast!

*/

 

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