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ecency-mobile/ios/Pods/boost-for-react-native/boost/intrusive/treap_algorithms.hpp

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/////////////////////////////////////////////////////////////////////////////
//
// (C) Copyright Ion Gaztanaga 2006-2014.
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// See http://www.boost.org/libs/intrusive for documentation.
//
/////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_INTRUSIVE_TREAP_ALGORITHMS_HPP
#define BOOST_INTRUSIVE_TREAP_ALGORITHMS_HPP
#include <boost/intrusive/detail/config_begin.hpp>
#include <boost/intrusive/intrusive_fwd.hpp>
#include <cstddef>
#include <boost/intrusive/detail/assert.hpp>
#include <boost/intrusive/detail/algo_type.hpp>
#include <boost/intrusive/bstree_algorithms.hpp>
#if defined(BOOST_HAS_PRAGMA_ONCE)
# pragma once
#endif
namespace boost {
namespace intrusive {
#ifndef BOOST_INTRUSIVE_DOXYGEN_INVOKED
namespace detail
{
template<class ValueTraits, class NodePtrPrioCompare, class ExtraChecker>
struct treap_node_extra_checker
: public ExtraChecker
{
typedef ExtraChecker base_checker_t;
typedef ValueTraits value_traits;
typedef typename value_traits::node_traits node_traits;
typedef typename node_traits::const_node_ptr const_node_ptr;
typedef typename base_checker_t::return_type return_type;
treap_node_extra_checker(const NodePtrPrioCompare& prio_comp, ExtraChecker extra_checker)
: base_checker_t(extra_checker), prio_comp_(prio_comp)
{}
void operator () (const const_node_ptr& p,
const return_type& check_return_left, const return_type& check_return_right,
return_type& check_return)
{
if (node_traits::get_left(p))
BOOST_INTRUSIVE_INVARIANT_ASSERT(!prio_comp_(node_traits::get_left(p), p));
if (node_traits::get_right(p))
BOOST_INTRUSIVE_INVARIANT_ASSERT(!prio_comp_(node_traits::get_right(p), p));
base_checker_t::operator()(p, check_return_left, check_return_right, check_return);
}
const NodePtrPrioCompare prio_comp_;
};
} // namespace detail
#endif //#ifndef BOOST_INTRUSIVE_DOXYGEN_INVOKED
//! treap_algorithms provides basic algorithms to manipulate
//! nodes forming a treap.
//!
//! (1) the header node is maintained with links not only to the root
//! but also to the leftmost node of the tree, to enable constant time
//! begin(), and to the rightmost node of the tree, to enable linear time
//! performance when used with the generic set algorithms (set_union,
//! etc.);
//!
//! (2) when a node being deleted has two children its successor node is
//! relinked into its place, rather than copied, so that the only
//! pointers invalidated are those referring to the deleted node.
//!
//! treap_algorithms is configured with a NodeTraits class, which encapsulates the
//! information about the node to be manipulated. NodeTraits must support the
//! following interface:
//!
//! <b>Typedefs</b>:
//!
//! <tt>node</tt>: The type of the node that forms the treap
//!
//! <tt>node_ptr</tt>: A pointer to a node
//!
//! <tt>const_node_ptr</tt>: A pointer to a const node
//!
//! <b>Static functions</b>:
//!
//! <tt>static node_ptr get_parent(const_node_ptr n);</tt>
//!
//! <tt>static void set_parent(node_ptr n, node_ptr parent);</tt>
//!
//! <tt>static node_ptr get_left(const_node_ptr n);</tt>
//!
//! <tt>static void set_left(node_ptr n, node_ptr left);</tt>
//!
//! <tt>static node_ptr get_right(const_node_ptr n);</tt>
//!
//! <tt>static void set_right(node_ptr n, node_ptr right);</tt>
template<class NodeTraits>
class treap_algorithms
#ifndef BOOST_INTRUSIVE_DOXYGEN_INVOKED
: public bstree_algorithms<NodeTraits>
#endif
{
public:
typedef NodeTraits node_traits;
typedef typename NodeTraits::node node;
typedef typename NodeTraits::node_ptr node_ptr;
typedef typename NodeTraits::const_node_ptr const_node_ptr;
/// @cond
private:
typedef bstree_algorithms<NodeTraits> bstree_algo;
class rerotate_on_destroy
{
rerotate_on_destroy& operator=(const rerotate_on_destroy&);
public:
rerotate_on_destroy(const node_ptr & header, const node_ptr & p, std::size_t &n)
: header_(header), p_(p), n_(n), remove_it_(true)
{}
~rerotate_on_destroy()
{
if(remove_it_){
rotate_up_n(header_, p_, n_);
}
}
void release()
{ remove_it_ = false; }
const node_ptr header_;
const node_ptr p_;
std::size_t &n_;
bool remove_it_;
};
static void rotate_up_n(const node_ptr header, const node_ptr p, std::size_t n)
{
node_ptr p_parent(NodeTraits::get_parent(p));
node_ptr p_grandparent(NodeTraits::get_parent(p_parent));
while(n--){
if(p == NodeTraits::get_left(p_parent)){ //p is left child
bstree_algo::rotate_right(p_parent, p, p_grandparent, header);
}
else{ //p is right child
bstree_algo::rotate_left(p_parent, p, p_grandparent, header);
}
p_parent = p_grandparent;
p_grandparent = NodeTraits::get_parent(p_parent);
}
}
/// @endcond
public:
//! This type is the information that will be
//! filled by insert_unique_check
struct insert_commit_data
/// @cond
: public bstree_algo::insert_commit_data
/// @endcond
{
/// @cond
std::size_t rotations;
/// @endcond
};
#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
//! @copydoc ::boost::intrusive::bstree_algorithms::get_header(const const_node_ptr&)
static node_ptr get_header(const const_node_ptr & n);
//! @copydoc ::boost::intrusive::bstree_algorithms::begin_node
static node_ptr begin_node(const const_node_ptr & header);
//! @copydoc ::boost::intrusive::bstree_algorithms::end_node
static node_ptr end_node(const const_node_ptr & header);
//! @copydoc ::boost::intrusive::bstree_algorithms::swap_tree
static void swap_tree(const node_ptr & header1, const node_ptr & header2);
//! @copydoc ::boost::intrusive::bstree_algorithms::swap_nodes(const node_ptr&,const node_ptr&)
static void swap_nodes(const node_ptr & node1, const node_ptr & node2);
//! @copydoc ::boost::intrusive::bstree_algorithms::swap_nodes(const node_ptr&,const node_ptr&,const node_ptr&,const node_ptr&)
static void swap_nodes(const node_ptr & node1, const node_ptr & header1, const node_ptr & node2, const node_ptr & header2);
//! @copydoc ::boost::intrusive::bstree_algorithms::replace_node(const node_ptr&,const node_ptr&)
static void replace_node(const node_ptr & node_to_be_replaced, const node_ptr & new_node);
//! @copydoc ::boost::intrusive::bstree_algorithms::replace_node(const node_ptr&,const node_ptr&,const node_ptr&)
static void replace_node(const node_ptr & node_to_be_replaced, const node_ptr & header, const node_ptr & new_node);
#endif //#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
//! @copydoc ::boost::intrusive::bstree_algorithms::unlink(const node_ptr&)
template<class NodePtrPriorityCompare>
static void unlink(const node_ptr & node, NodePtrPriorityCompare pcomp)
{
node_ptr x = NodeTraits::get_parent(node);
if(x){
while(!bstree_algo::is_header(x))
x = NodeTraits::get_parent(x);
erase(x, node, pcomp);
}
}
#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
//! @copydoc ::boost::intrusive::bstree_algorithms::unlink_leftmost_without_rebalance
static node_ptr unlink_leftmost_without_rebalance(const node_ptr & header);
//! @copydoc ::boost::intrusive::bstree_algorithms::unique(const const_node_ptr&)
static bool unique(const const_node_ptr & node);
//! @copydoc ::boost::intrusive::bstree_algorithms::size(const const_node_ptr&)
static std::size_t size(const const_node_ptr & header);
//! @copydoc ::boost::intrusive::bstree_algorithms::next_node(const node_ptr&)
static node_ptr next_node(const node_ptr & node);
//! @copydoc ::boost::intrusive::bstree_algorithms::prev_node(const node_ptr&)
static node_ptr prev_node(const node_ptr & node);
//! @copydoc ::boost::intrusive::bstree_algorithms::init(const node_ptr&)
static void init(const node_ptr & node);
//! @copydoc ::boost::intrusive::bstree_algorithms::init_header(const node_ptr&)
static void init_header(const node_ptr & header);
#endif //#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
//! @copydoc ::boost::intrusive::bstree_algorithms::erase(const node_ptr&,const node_ptr&)
template<class NodePtrPriorityCompare>
static node_ptr erase(const node_ptr & header, const node_ptr & z, NodePtrPriorityCompare pcomp)
{
rebalance_for_erasure(header, z, pcomp);
bstree_algo::erase(header, z);
return z;
}
#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
//! @copydoc ::boost::intrusive::bstree_algorithms::clone(const const_node_ptr&,const node_ptr&,Cloner,Disposer)
template <class Cloner, class Disposer>
static void clone
(const const_node_ptr & source_header, const node_ptr & target_header, Cloner cloner, Disposer disposer);
//! @copydoc ::boost::intrusive::bstree_algorithms::clear_and_dispose(const node_ptr&,Disposer)
template<class Disposer>
static void clear_and_dispose(const node_ptr & header, Disposer disposer);
//! @copydoc ::boost::intrusive::bstree_algorithms::lower_bound(const const_node_ptr&,const KeyType&,KeyNodePtrCompare)
template<class KeyType, class KeyNodePtrCompare>
static node_ptr lower_bound
(const const_node_ptr & header, const KeyType &key, KeyNodePtrCompare comp);
//! @copydoc ::boost::intrusive::bstree_algorithms::upper_bound(const const_node_ptr&,const KeyType&,KeyNodePtrCompare)
template<class KeyType, class KeyNodePtrCompare>
static node_ptr upper_bound
(const const_node_ptr & header, const KeyType &key, KeyNodePtrCompare comp);
//! @copydoc ::boost::intrusive::bstree_algorithms::find(const const_node_ptr&, const KeyType&,KeyNodePtrCompare)
template<class KeyType, class KeyNodePtrCompare>
static node_ptr find
(const const_node_ptr & header, const KeyType &key, KeyNodePtrCompare comp);
//! @copydoc ::boost::intrusive::bstree_algorithms::equal_range(const const_node_ptr&,const KeyType&,KeyNodePtrCompare)
template<class KeyType, class KeyNodePtrCompare>
static std::pair<node_ptr, node_ptr> equal_range
(const const_node_ptr & header, const KeyType &key, KeyNodePtrCompare comp);
//! @copydoc ::boost::intrusive::bstree_algorithms::bounded_range(const const_node_ptr&,const KeyType&,const KeyType&,KeyNodePtrCompare,bool,bool)
template<class KeyType, class KeyNodePtrCompare>
static std::pair<node_ptr, node_ptr> bounded_range
(const const_node_ptr & header, const KeyType &lower_key, const KeyType &upper_key, KeyNodePtrCompare comp
, bool left_closed, bool right_closed);
//! @copydoc ::boost::intrusive::bstree_algorithms::count(const const_node_ptr&,const KeyType&,KeyNodePtrCompare)
template<class KeyType, class KeyNodePtrCompare>
static std::size_t count(const const_node_ptr & header, const KeyType &key, KeyNodePtrCompare comp);
#endif //#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
//! <b>Requires</b>: "h" must be the header node of a tree.
//! NodePtrCompare is a function object that induces a strict weak
//! ordering compatible with the strict weak ordering used to create the
//! the tree. NodePtrCompare compares two node_ptrs.
//! NodePtrPriorityCompare is a priority function object that induces a strict weak
//! ordering compatible with the one used to create the
//! the tree. NodePtrPriorityCompare compares two node_ptrs.
//!
//! <b>Effects</b>: Inserts new_node into the tree before the upper bound
//! according to "comp" and rotates the tree according to "pcomp".
//!
//! <b>Complexity</b>: Average complexity for insert element is at
//! most logarithmic.
//!
//! <b>Throws</b>: If "comp" throw or "pcomp" throw.
template<class NodePtrCompare, class NodePtrPriorityCompare>
static node_ptr insert_equal_upper_bound
(const node_ptr & h, const node_ptr & new_node, NodePtrCompare comp, NodePtrPriorityCompare pcomp)
{
insert_commit_data commit_data;
bstree_algo::insert_equal_upper_bound_check(h, new_node, comp, commit_data);
rebalance_check_and_commit(h, new_node, pcomp, commit_data);
return new_node;
}
//! <b>Requires</b>: "h" must be the header node of a tree.
//! NodePtrCompare is a function object that induces a strict weak
//! ordering compatible with the strict weak ordering used to create the
//! the tree. NodePtrCompare compares two node_ptrs.
//! NodePtrPriorityCompare is a priority function object that induces a strict weak
//! ordering compatible with the one used to create the
//! the tree. NodePtrPriorityCompare compares two node_ptrs.
//!
//! <b>Effects</b>: Inserts new_node into the tree before the upper bound
//! according to "comp" and rotates the tree according to "pcomp".
//!
//! <b>Complexity</b>: Average complexity for insert element is at
//! most logarithmic.
//!
//! <b>Throws</b>: If "comp" throws.
template<class NodePtrCompare, class NodePtrPriorityCompare>
static node_ptr insert_equal_lower_bound
(const node_ptr & h, const node_ptr & new_node, NodePtrCompare comp, NodePtrPriorityCompare pcomp)
{
insert_commit_data commit_data;
bstree_algo::insert_equal_lower_bound_check(h, new_node, comp, commit_data);
rebalance_check_and_commit(h, new_node, pcomp, commit_data);
return new_node;
}
//! <b>Requires</b>: "header" must be the header node of a tree.
//! NodePtrCompare is a function object that induces a strict weak
//! ordering compatible with the strict weak ordering used to create the
//! the tree. NodePtrCompare compares two node_ptrs. "hint" is node from
//! the "header"'s tree.
//! NodePtrPriorityCompare is a priority function object that induces a strict weak
//! ordering compatible with the one used to create the
//! the tree. NodePtrPriorityCompare compares two node_ptrs.
//!
//! <b>Effects</b>: Inserts new_node into the tree, using "hint" as a hint to
//! where it will be inserted. If "hint" is the upper_bound
//! the insertion takes constant time (two comparisons in the worst case).
//! Rotates the tree according to "pcomp".
//!
//! <b>Complexity</b>: Logarithmic in general, but it is amortized
//! constant time if new_node is inserted immediately before "hint".
//!
//! <b>Throws</b>: If "comp" throw or "pcomp" throw.
template<class NodePtrCompare, class NodePtrPriorityCompare>
static node_ptr insert_equal
(const node_ptr & h, const node_ptr & hint, const node_ptr & new_node, NodePtrCompare comp, NodePtrPriorityCompare pcomp)
{
insert_commit_data commit_data;
bstree_algo::insert_equal_check(h, hint, new_node, comp, commit_data);
rebalance_check_and_commit(h, new_node, pcomp, commit_data);
return new_node;
}
//! <b>Requires</b>: "header" must be the header node of a tree.
//! "pos" must be a valid node of the tree (including header end) node.
//! "pos" must be a node pointing to the successor to "new_node"
//! once inserted according to the order of already inserted nodes. This function does not
//! check "pos" and this precondition must be guaranteed by the caller.
//! NodePtrPriorityCompare is a priority function object that induces a strict weak
//! ordering compatible with the one used to create the
//! the tree. NodePtrPriorityCompare compares two node_ptrs.
//!
//! <b>Effects</b>: Inserts new_node into the tree before "pos"
//! and rotates the tree according to "pcomp".
//!
//! <b>Complexity</b>: Constant-time.
//!
//! <b>Throws</b>: If "pcomp" throws, strong guarantee.
//!
//! <b>Note</b>: If "pos" is not the successor of the newly inserted "new_node"
//! tree invariants might be broken.
template<class NodePtrPriorityCompare>
static node_ptr insert_before
(const node_ptr & header, const node_ptr & pos, const node_ptr & new_node, NodePtrPriorityCompare pcomp)
{
insert_commit_data commit_data;
bstree_algo::insert_before_check(header, pos, commit_data);
rebalance_check_and_commit(header, new_node, pcomp, commit_data);
return new_node;
}
//! <b>Requires</b>: "header" must be the header node of a tree.
//! "new_node" must be, according to the used ordering no less than the
//! greatest inserted key.
//! NodePtrPriorityCompare is a priority function object that induces a strict weak
//! ordering compatible with the one used to create the
//! the tree. NodePtrPriorityCompare compares two node_ptrs.
//!
//! <b>Effects</b>: Inserts x into the tree in the last position
//! and rotates the tree according to "pcomp".
//!
//! <b>Complexity</b>: Constant-time.
//!
//! <b>Throws</b>: If "pcomp" throws, strong guarantee.
//!
//! <b>Note</b>: If "new_node" is less than the greatest inserted key
//! tree invariants are broken. This function is slightly faster than
//! using "insert_before".
template<class NodePtrPriorityCompare>
static void push_back(const node_ptr & header, const node_ptr & new_node, NodePtrPriorityCompare pcomp)
{
insert_commit_data commit_data;
bstree_algo::push_back_check(header, commit_data);
rebalance_check_and_commit(header, new_node, pcomp, commit_data);
}
//! <b>Requires</b>: "header" must be the header node of a tree.
//! "new_node" must be, according to the used ordering, no greater than the
//! lowest inserted key.
//! NodePtrPriorityCompare is a priority function object that induces a strict weak
//! ordering compatible with the one used to create the
//! the tree. NodePtrPriorityCompare compares two node_ptrs.
//!
//! <b>Effects</b>: Inserts x into the tree in the first position
//! and rotates the tree according to "pcomp".
//!
//! <b>Complexity</b>: Constant-time.
//!
//! <b>Throws</b>: If "pcomp" throws, strong guarantee.
//!
//! <b>Note</b>: If "new_node" is greater than the lowest inserted key
//! tree invariants are broken. This function is slightly faster than
//! using "insert_before".
template<class NodePtrPriorityCompare>
static void push_front(const node_ptr & header, const node_ptr & new_node, NodePtrPriorityCompare pcomp)
{
insert_commit_data commit_data;
bstree_algo::push_front_check(header, commit_data);
rebalance_check_and_commit(header, new_node, pcomp, commit_data);
}
//! <b>Requires</b>: "header" must be the header node of a tree.
//! KeyNodePtrCompare is a function object that induces a strict weak
//! ordering compatible with the strict weak ordering used to create the
//! the tree. NodePtrCompare compares KeyType with a node_ptr.
//!
//! <b>Effects</b>: Checks if there is an equivalent node to "key" in the
//! tree according to "comp" and obtains the needed information to realize
//! a constant-time node insertion if there is no equivalent node.
//!
//! <b>Returns</b>: If there is an equivalent value
//! returns a pair containing a node_ptr to the already present node
//! and false. If there is not equivalent key can be inserted returns true
//! in the returned pair's boolean and fills "commit_data" that is meant to
//! be used with the "insert_commit" function to achieve a constant-time
//! insertion function.
//!
//! <b>Complexity</b>: Average complexity is at most logarithmic.
//!
//! <b>Throws</b>: If "comp" throws.
//!
//! <b>Notes</b>: This function is used to improve performance when constructing
//! a node is expensive and the user does not want to have two equivalent nodes
//! in the tree: if there is an equivalent value
//! the constructed object must be discarded. Many times, the part of the
//! node that is used to impose the order is much cheaper to construct
//! than the node and this function offers the possibility to use that part
//! to check if the insertion will be successful.
//!
//! If the check is successful, the user can construct the node and use
//! "insert_commit" to insert the node in constant-time. This gives a total
//! logarithmic complexity to the insertion: check(O(log(N)) + commit(O(1)).
//!
//! "commit_data" remains valid for a subsequent "insert_unique_commit" only
//! if no more objects are inserted or erased from the set.
template<class KeyType, class KeyNodePtrCompare, class KeyNodePtrPrioCompare>
static std::pair<node_ptr, bool> insert_unique_check
(const const_node_ptr & header, const KeyType &key
,KeyNodePtrCompare comp, KeyNodePtrPrioCompare pcomp
,insert_commit_data &commit_data)
{
std::pair<node_ptr, bool> ret =
bstree_algo::insert_unique_check(header, key, comp, commit_data);
if(ret.second)
rebalance_after_insertion_check(header, commit_data.node, key, pcomp, commit_data.rotations);
return ret;
}
//! <b>Requires</b>: "header" must be the header node of a tree.
//! KeyNodePtrCompare is a function object that induces a strict weak
//! ordering compatible with the strict weak ordering used to create the
//! the tree. NodePtrCompare compares KeyType with a node_ptr.
//! "hint" is node from the "header"'s tree.
//!
//! <b>Effects</b>: Checks if there is an equivalent node to "key" in the
//! tree according to "comp" using "hint" as a hint to where it should be
//! inserted and obtains the needed information to realize
//! a constant-time node insertion if there is no equivalent node.
//! If "hint" is the upper_bound the function has constant time
//! complexity (two comparisons in the worst case).
//!
//! <b>Returns</b>: If there is an equivalent value
//! returns a pair containing a node_ptr to the already present node
//! and false. If there is not equivalent key can be inserted returns true
//! in the returned pair's boolean and fills "commit_data" that is meant to
//! be used with the "insert_commit" function to achieve a constant-time
//! insertion function.
//!
//! <b>Complexity</b>: Average complexity is at most logarithmic, but it is
//! amortized constant time if new_node should be inserted immediately before "hint".
//!
//! <b>Throws</b>: If "comp" throws.
//!
//! <b>Notes</b>: This function is used to improve performance when constructing
//! a node is expensive and the user does not want to have two equivalent nodes
//! in the tree: if there is an equivalent value
//! the constructed object must be discarded. Many times, the part of the
//! node that is used to impose the order is much cheaper to construct
//! than the node and this function offers the possibility to use that part
//! to check if the insertion will be successful.
//!
//! If the check is successful, the user can construct the node and use
//! "insert_commit" to insert the node in constant-time. This gives a total
//! logarithmic complexity to the insertion: check(O(log(N)) + commit(O(1)).
//!
//! "commit_data" remains valid for a subsequent "insert_unique_commit" only
//! if no more objects are inserted or erased from the set.
template<class KeyType, class KeyNodePtrCompare, class KeyNodePtrPrioCompare>
static std::pair<node_ptr, bool> insert_unique_check
(const const_node_ptr & header, const node_ptr & hint, const KeyType &key
,KeyNodePtrCompare comp, KeyNodePtrPrioCompare pcomp, insert_commit_data &commit_data)
{
std::pair<node_ptr, bool> ret =
bstree_algo::insert_unique_check(header, hint, key, comp, commit_data);
if(ret.second)
rebalance_after_insertion_check(header, commit_data.node, key, pcomp, commit_data.rotations);
return ret;
}
//! <b>Requires</b>: "header" must be the header node of a tree.
//! "commit_data" must have been obtained from a previous call to
//! "insert_unique_check". No objects should have been inserted or erased
//! from the set between the "insert_unique_check" that filled "commit_data"
//! and the call to "insert_commit".
//!
//!
//! <b>Effects</b>: Inserts new_node in the set using the information obtained
//! from the "commit_data" that a previous "insert_check" filled.
//!
//! <b>Complexity</b>: Constant time.
//!
//! <b>Throws</b>: Nothing.
//!
//! <b>Notes</b>: This function has only sense if a "insert_unique_check" has been
//! previously executed to fill "commit_data". No value should be inserted or
//! erased between the "insert_check" and "insert_commit" calls.
static void insert_unique_commit
(const node_ptr & header, const node_ptr & new_node, const insert_commit_data &commit_data)
{
bstree_algo::insert_unique_commit(header, new_node, commit_data);
rotate_up_n(header, new_node, commit_data.rotations);
}
//! @copydoc ::boost::intrusive::bstree_algorithms::transfer_unique
template<class NodePtrCompare, class KeyNodePtrPrioCompare>
static bool transfer_unique
(const node_ptr & header1, NodePtrCompare comp, KeyNodePtrPrioCompare pcomp, const node_ptr &header2, const node_ptr & z)
{
insert_commit_data commit_data;
bool const transferable = insert_unique_check(header1, z, comp, pcomp, commit_data).second;
if(transferable){
erase(header2, z, pcomp);
insert_unique_commit(header1, z, commit_data);
}
return transferable;
}
//! @copydoc ::boost::intrusive::bstree_algorithms::transfer_equal
template<class NodePtrCompare, class KeyNodePtrPrioCompare>
static void transfer_equal
(const node_ptr & header1, NodePtrCompare comp, KeyNodePtrPrioCompare pcomp, const node_ptr &header2, const node_ptr & z)
{
insert_commit_data commit_data;
bstree_algo::insert_equal_upper_bound_check(header1, z, comp, commit_data);
rebalance_after_insertion_check(header1, commit_data.node, z, pcomp, commit_data.rotations);
rebalance_for_erasure(header2, z, pcomp);
bstree_algo::erase(header2, z);
bstree_algo::insert_unique_commit(header1, z, commit_data);
rotate_up_n(header1, z, commit_data.rotations);
}
#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
//! @copydoc ::boost::intrusive::bstree_algorithms::is_header
static bool is_header(const const_node_ptr & p);
#endif //#ifdef BOOST_INTRUSIVE_DOXYGEN_INVOKED
/// @cond
private:
template<class NodePtrPriorityCompare>
static void rebalance_for_erasure(const node_ptr & header, const node_ptr & z, NodePtrPriorityCompare pcomp)
{
std::size_t n = 0;
rerotate_on_destroy rb(header, z, n);
node_ptr z_left = NodeTraits::get_left(z);
node_ptr z_right = NodeTraits::get_right(z);
while(z_left || z_right){
const node_ptr z_parent(NodeTraits::get_parent(z));
if(!z_right || (z_left && pcomp(z_left, z_right))){
bstree_algo::rotate_right(z, z_left, z_parent, header);
}
else{
bstree_algo::rotate_left(z, z_right, z_parent, header);
}
++n;
z_left = NodeTraits::get_left(z);
z_right = NodeTraits::get_right(z);
}
rb.release();
}
template<class NodePtrPriorityCompare>
static void rebalance_check_and_commit
(const node_ptr & h, const node_ptr & new_node, NodePtrPriorityCompare pcomp, insert_commit_data &commit_data)
{
rebalance_after_insertion_check(h, commit_data.node, new_node, pcomp, commit_data.rotations);
//No-throw
bstree_algo::insert_unique_commit(h, new_node, commit_data);
rotate_up_n(h, new_node, commit_data.rotations);
}
template<class Key, class KeyNodePriorityCompare>
static void rebalance_after_insertion_check
(const const_node_ptr &header, const const_node_ptr & up, const Key &k
, KeyNodePriorityCompare pcomp, std::size_t &num_rotations)
{
const_node_ptr upnode(up);
//First check rotations since pcomp can throw
num_rotations = 0;
std::size_t n = 0;
while(upnode != header && pcomp(k, upnode)){
++n;
upnode = NodeTraits::get_parent(upnode);
}
num_rotations = n;
}
template<class NodePtrPriorityCompare>
static bool check_invariant(const const_node_ptr & header, NodePtrPriorityCompare pcomp)
{
node_ptr beg = begin_node(header);
node_ptr end = end_node(header);
while(beg != end){
node_ptr p = NodeTraits::get_parent(beg);
if(p != header){
if(pcomp(beg, p))
return false;
}
beg = next_node(beg);
}
return true;
}
/// @endcond
};
/// @cond
template<class NodeTraits>
struct get_algo<TreapAlgorithms, NodeTraits>
{
typedef treap_algorithms<NodeTraits> type;
};
template <class ValueTraits, class NodePtrCompare, class ExtraChecker>
struct get_node_checker<TreapAlgorithms, ValueTraits, NodePtrCompare, ExtraChecker>
{
typedef detail::bstree_node_checker<ValueTraits, NodePtrCompare, ExtraChecker> type;
};
/// @endcond
} //namespace intrusive
} //namespace boost
#include <boost/intrusive/detail/config_end.hpp>
#endif //BOOST_INTRUSIVE_TREAP_ALGORITHMS_HPP
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