// Need a value copy constructor for typical uses
public FloodfillPathfinder(FloodfillPathfinder <T> src)
{
#if DEBUG
if (null == src)
{
throw new ArgumentNullException(nameof(src));
}
#endif
_blacklist = new HashSet <T>(src._blacklist);
_blacklist_fn = src._blacklist_fn;
_inDomain = src._inDomain;
_map = new Dictionary <T, int>(src._map);
_forward = src._forward;
_inverse = src._inverse;
}
// retain domain and blacklist, change specification of forward and inverse which invalidates the map itself
public FloodfillPathfinder(FloodfillPathfinder <T> src, Func <T, Dictionary <T, int> > Forward, Func <T, Dictionary <T, int> > Inverse)
{
#if DEBUG
if (null == src)
{
throw new ArgumentNullException(nameof(src));
}
#endif
_blacklist = new HashSet <T>(src._blacklist);
_blacklist_fn = src._blacklist_fn;
_inDomain = src._inDomain;
_map = new Dictionary <T, int>();
_forward = Forward
#if DEBUG
?? throw new ArgumentNullException(nameof(Forward))
#endif
;
_inverse = Inverse
#if DEBUG
?? throw new ArgumentNullException(nameof(Inverse))
#endif
;
}