static public void PivotLeft <LEFT_TYPE, RIGHT_TYPE>(this BidirectionalDictionary <LEFT_TYPE, RIGHT_TYPE> item, LEFT_TYPE old_value, LEFT_TYPE new_value)
{
RIGHT_TYPE right;
if (item.TryGetValueByLeft(old_value, out right))
{
item.Update(new_value, right);
}
}
static public RIGHT_TYPE GetValueByLeft <LEFT_TYPE, RIGHT_TYPE>(this BidirectionalDictionary <LEFT_TYPE, RIGHT_TYPE> item, LEFT_TYPE left, RIGHT_TYPE default_value)
{
RIGHT_TYPE right;
if (item.TryGetValueByLeft(left, out right) == false)
{
right = default_value;
}
return(right);
}
