Passing optional parameter by reference in c++

Question

I\'m having a problem with optional function parameter in C++

What I\'m trying to do is to write function with optional parameter which is passed by reference, so th

Answer 1

Here is another crazy way that does not result in memory leaks, which you should never use in real life, but seems to be standard compliant at first glance and compiles with Visual C++ 2008 & g++ 3.4.4 under Cygwin:

void foo(double &bar, double &foobar = (*((double*)0)))
{
   bar = 100;
   double* pfoobar = &foobar;
   if (pfoobar != 0)
       foobar = 150;
}

To reiterate: DON'T DO THIS! THERE ARE BETTER OPTIONS! OVERLOADING CAN BE YOUR FRIEND! But yeah, you can do it if you're foolish and careful. :)