gistfile1.cpp

#include <iostream>
#include <stdexcept>

using std::cout;
using std::ostream;
using std::runtime_error;

struct auto_flush {
    ~auto_flush() {
        cout << "\nflush called\n";
        cout.flush();
    }
};

int g()
{
    throw runtime_error("dummy runtime error");
}

int h()
{
    throw runtime_error("another dummy runtime error");
    return -1;
}

int f()
{
    try {
        auto_flush af;
        cout << "hello world";
        g();
        cout << h();
    } catch(...) {
        // destructor of auto_flush will be called
        // whenever an excpetion is catched or not
    }
    return 0;
}

int main()
{
    f();
    return 0;
}