[Boost-users] [Parameter] Adding arguments to pack through macro?

Hi, I guess that the subject line isn't even technically correct. What I'd like to do is to implement something like the following: #define FOO(x) MyNamedParamFn(x, d = 3, e = 4) Where e.g. "FOO((a = 0, b = 1));" would expand to the equivalent of: MyNamedParamFn(a = 0, b= 1, d = 3, e = 4); Is this possible? / Johan