+
+int family_to_sys(Family f)
+{
+ switch(f)
+ {
+ case UNSPEC: return AF_UNSPEC;
+ case INET: return AF_INET;
+ case INET6: return AF_INET6;
+ case UNIX: return AF_UNIX;
+ default: throw invalid_argument("family_to_sys");
+ }
+}
+
+Family family_from_sys(int f)
+{
+ switch(f)
+ {
+ case AF_UNSPEC: return UNSPEC;
+ case AF_INET: return INET;
+ case AF_INET6: return INET6;
+ case AF_UNIX: return UNIX;
+ default: throw invalid_argument("family_from_sys");
+ }
+}
+