PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::iterator
PB_DS_CLASS_C_DEC::
find_by_order(size_type order)
{
node_iterator it = node_begin();
node_iterator end_it = node_end();
while (it != end_it)
{
node_iterator l_it = it.get_l_child();
const size_type o = (l_it == end_it)? 0 : l_it.get_metadata();
if (order == o)
return *it;
else if (order < o)
it = l_it;
else
{
order -= o + 1;
it = it.get_r_child();
}
}
return base_type::end_iterator();
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::iterator
PB_DS_CLASS_C_DEC::
find_by_order(size_type order)
{
if (empty())
return end();
++order;
node_iterator nd_it = node_begin();
while (true)
{
if (order > nd_it.get_metadata())
return ++base_type::rightmost_it(nd_it);
const size_type num_children = nd_it.num_children();
if (num_children == 0)
return *nd_it;
for (size_type i = 0; i < num_children; ++i)
{
node_iterator child_nd_it = nd_it.get_child(i);
if (order <= child_nd_it.get_metadata())
{
i = num_children;
nd_it = child_nd_it;
}
else
order -= child_nd_it.get_metadata();
}
}
}
PB_DS_CLASS_T_DEC
std::pair<
typename PB_DS_CLASS_C_DEC::iterator,
typename PB_DS_CLASS_C_DEC::iterator>
PB_DS_CLASS_C_DEC::
prefix_range(typename access_traits::const_iterator b,
typename access_traits::const_iterator e)
{
Node_Itr nd_it = node_begin();
Node_Itr end_nd_it = node_end();
const access_traits& r_traits = get_access_traits();
const size_type given_range_length = std::distance(b, e);
while (true)
{
if (nd_it == end_nd_it)
return (std::make_pair(end(), end()));
const size_type common_range_length =
base_type::common_prefix_len(nd_it, b, e, r_traits);
if (common_range_length >= given_range_length)
{
iterator ret_b = this->leftmost_it(nd_it);
iterator ret_e = this->rightmost_it(nd_it);
return (std::make_pair(ret_b, ++ret_e));
}
nd_it = next_child(nd_it, b, e, end_nd_it, r_traits);
}
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::size_type
PB_DS_CLASS_C_DEC::
order_of_key(key_const_reference r_key) const
{
node_const_iterator it = node_begin();
node_const_iterator end_it = node_end();
const cmp_fn& r_cmp_fn = const_cast<PB_DS_CLASS_C_DEC*>(this)->get_cmp_fn();
size_type ord = 0;
while (it != end_it)
{
node_const_iterator l_it = it.get_l_child();
if (r_cmp_fn(r_key, this->extract_key(*(*it))))
it = l_it;
else if (r_cmp_fn(this->extract_key(*(*it)), r_key))
{
ord += (l_it == end_it)? 1 : 1 + l_it.get_metadata();
it = it.get_r_child();
}
else
{
ord += (l_it == end_it)? 0 : l_it.get_metadata();
it = end_it;
}
}
return ord;
}
void print_levels()
{
for (type_node* it = node_begin(); it != node_end(); it = it->next[0])
{
printf("%d, ", it->next_size);
}
printf("\n");
}
PB_DS_CLASS_T_DEC
inline typename PB_DS_CLASS_C_DEC::size_type
PB_DS_CLASS_C_DEC::
order_of_prefix(typename access_traits::const_iterator b,
typename access_traits::const_iterator e) const
{
if (empty())
return 0;
const _ATraits& r_traits =
const_cast<PB_DS_CLASS_C_DEC*>(this)->get_access_traits();
node_const_iterator nd_it = node_begin();
node_const_iterator end_nd_it = node_end();
size_type ord = 0;
while (true)
{
const size_type num_children = nd_it.num_children();
if (num_children == 0)
{
key_const_reference r_key = base_type::extract_key(*(*nd_it));
typename access_traits::const_iterator key_b =
r_traits.begin(r_key);
typename access_traits::const_iterator key_e =
r_traits.end(r_key);
return (base_type::less(key_b, key_e, b, e, r_traits)) ?
ord + 1 : ord;
}
node_const_iterator next_nd_it = end_nd_it;
size_type i = num_children - 1;
do
{
node_const_iterator child_nd_it = nd_it.get_child(i);
if (next_nd_it != end_nd_it)
ord += child_nd_it.get_metadata();
else if (!base_type::less(b, e,
child_nd_it.valid_prefix().first,
child_nd_it.valid_prefix().second,
r_traits))
next_nd_it = child_nd_it;
}
while (i-- > 0);
if (next_nd_it == end_nd_it)
return ord;
nd_it = next_nd_it;
}
}
