cc-doit.cc

#include <exception>
#include <iostream>

class fopen_failed: public std::exception
{
public:
	const char *what() const throw() {
		return "fopen failed";
	}
};

int main()
{
	try {
		throw fopen_failed();
	} catch (...) {
	};
	std::cout << "good\n";
	return 0;
}