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intrusive_set_external_comparator.hh
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intrusive_set_external_comparator.hh
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/*
* Copyright (C) 2016 ScyllaDB
*/
/*
* This file is part of Scylla.
*
* Scylla is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Scylla is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* (C) Copyright Ion Gaztanaga 2013-2014
* 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)
*/
#pragma once
#include <boost/intrusive/set.hpp>
#include <iterator>
namespace bi = boost::intrusive;
typedef bi::rbtree_algorithms<bi::rbtree_node_traits<void*, true>> algo;
class intrusive_set_external_comparator_member_hook : public bi::set_member_hook<bi::optimize_size<true>> {
public:
intrusive_set_external_comparator_member_hook() = default;
intrusive_set_external_comparator_member_hook(intrusive_set_external_comparator_member_hook&& o) noexcept {
algo::replace_node(o.this_ptr(), this_ptr());
algo::init(o.this_ptr());
}
};
template<typename Elem,
intrusive_set_external_comparator_member_hook Elem::* PtrToMember>
class intrusive_set_external_comparator final {
typedef boost::intrusive::mhtraits<Elem, intrusive_set_external_comparator_member_hook, PtrToMember> value_traits;
typedef typename value_traits::node_traits node_traits;
typedef typename node_traits::node_ptr node_ptr;
public:
typedef Elem value_type;
typedef typename bi::tree_iterator<value_traits, false> iterator;
typedef typename bi::tree_iterator<value_traits, true> const_iterator;
typedef typename std::reverse_iterator<iterator> reverse_iterator;
typedef typename std::reverse_iterator<const_iterator> const_reverse_iterator;
private:
intrusive_set_external_comparator_member_hook _header;
static const value_traits _value_traits;
struct key_of_value {
typedef Elem type;
Elem& operator()(Elem& t) { return t; }
};
template <typename Comparator>
struct key_node_comparator {
Comparator _cmp;
const value_traits& _value_traits;
key_node_comparator(Comparator cmp, const value_traits& value_traits) : _cmp(cmp), _value_traits(value_traits) { }
bool operator()(const node_ptr& a, const node_ptr& b) {
return _cmp(*_value_traits.to_value_ptr(a), *_value_traits.to_value_ptr(b));
}
template <typename T1>
bool operator()(const node_ptr& a, const T1& b) {
return _cmp(*_value_traits.to_value_ptr(a), b);
}
template <typename T1>
bool operator()(const T1& a, const node_ptr& b) {
return _cmp(a, *_value_traits.to_value_ptr(b));
}
template <typename T1, typename T2>
bool operator()(const T1& a, const T2& b) {
return _cmp(a, b);
}
};
using const_value_traits_ptr = typename std::pointer_traits<typename value_traits::node_ptr>::template rebind<const value_traits>;
const_value_traits_ptr priv_value_traits_ptr() const {
return bi::pointer_traits<const_value_traits_ptr>::pointer_to(_value_traits);
}
template <typename Comparator>
key_node_comparator<Comparator> key_node_comp(Comparator comp) const {
return key_node_comparator<Comparator>(comp, _value_traits);
}
iterator insert_unique_commit(Elem& value, const algo::insert_commit_data &commit_data) {
node_ptr to_insert(_value_traits.to_node_ptr(value));
algo::insert_unique_commit(_header.this_ptr(), to_insert, commit_data);
return iterator(to_insert, priv_value_traits_ptr());
}
public:
intrusive_set_external_comparator() { algo::init_header(_header.this_ptr()); }
intrusive_set_external_comparator(intrusive_set_external_comparator&& o) {
algo::swap_tree(_header.this_ptr(), node_ptr(o._header.this_ptr()));
}
iterator begin() { return iterator(algo::begin_node(_header.this_ptr()), priv_value_traits_ptr()); }
const_iterator begin() const { return const_iterator(algo::begin_node(_header.this_ptr()), priv_value_traits_ptr()); }
iterator end() { return iterator(algo::end_node(_header.this_ptr()), priv_value_traits_ptr()); }
const_iterator end() const { return const_iterator(algo::end_node(_header.this_ptr()), priv_value_traits_ptr()); }
reverse_iterator rbegin() { return reverse_iterator(end()); }
const_reverse_iterator rbegin() const { return const_reverse_iterator(end()); }
reverse_iterator rend() { return reverse_iterator(begin()); }
const_reverse_iterator rend() const { return const_reverse_iterator(begin()); }
template<class Disposer>
void clear_and_dispose(Disposer disposer) {
algo::clear_and_dispose(_header.this_ptr(),
[&disposer] (const node_ptr& p) {
disposer(_value_traits.to_value_ptr(p));
});
algo::init_header(_header.this_ptr());
}
bool empty() const { return algo::unique(_header.this_ptr()); }
// WARNING: this method has O(N) time complexity, use with care
auto calculate_size() const { return algo::size(_header.this_ptr()); }
iterator erase(const_iterator i) {
const_iterator ret(i);
++ret;
node_ptr to_erase(i.pointed_node());
algo::erase(_header.this_ptr(), to_erase);
algo::init(to_erase);
return ret.unconst();
}
iterator erase(const_iterator b, const_iterator e) {
while (b != e) {
erase(b++);
}
return b.unconst();
}
template<class Disposer>
iterator erase_and_dispose(const_iterator i, Disposer disposer) {
node_ptr to_erase(i.pointed_node());
iterator ret(erase(i));
disposer(_value_traits.to_value_ptr(to_erase));
return ret;
}
template<class Disposer>
iterator erase_and_dispose(const_iterator b, const_iterator e, Disposer disposer) {
while (b != e) {
erase_and_dispose(b++, disposer);
}
return b.unconst();
}
template <class Cloner, class Disposer>
void clone_from(const intrusive_set_external_comparator &src, Cloner cloner, Disposer disposer) {
clear_and_dispose(disposer);
if (!src.empty()) {
auto rollback = defer([this, &disposer] { this->clear_and_dispose(disposer); });
algo::clone(src._header.this_ptr(),
_header.this_ptr(),
[&cloner] (const node_ptr& p) {
return _value_traits.to_node_ptr(*cloner(*_value_traits.to_value_ptr(p)));
},
[&disposer] (const node_ptr& p) {
disposer(_value_traits.to_value_ptr(p));
});
rollback.cancel();
}
}
Elem* unlink_leftmost_without_rebalance() {
node_ptr to_be_disposed(algo::unlink_leftmost_without_rebalance(_header.this_ptr()));
if(!to_be_disposed)
return 0;
algo::init(to_be_disposed);
return _value_traits.to_value_ptr(to_be_disposed);
}
iterator insert_before(const_iterator pos, Elem& value) {
node_ptr to_insert(_value_traits.to_node_ptr(value));
return iterator(algo::insert_before(_header.this_ptr(), pos.pointed_node(), to_insert), priv_value_traits_ptr());
}
template<class KeyType, class KeyTypeKeyCompare>
iterator upper_bound(const KeyType& key, KeyTypeKeyCompare comp) {
return iterator(algo::upper_bound(_header.this_ptr(), key, key_node_comp(comp)), priv_value_traits_ptr());
}
template<class KeyType, class KeyTypeKeyCompare>
const_iterator upper_bound(const KeyType& key, KeyTypeKeyCompare comp) const {
return const_iterator(algo::upper_bound(_header.this_ptr(), key, key_node_comp(comp)), priv_value_traits_ptr());
}
template<class KeyType, class KeyTypeKeyCompare>
iterator lower_bound(const KeyType &key, KeyTypeKeyCompare comp) {
return iterator(algo::lower_bound(_header.this_ptr(), key, key_node_comp(comp)), priv_value_traits_ptr());
}
template<class KeyType, class KeyTypeKeyCompare>
const_iterator lower_bound(const KeyType &key, KeyTypeKeyCompare comp) const {
return const_iterator(algo::lower_bound(_header.this_ptr(), key, key_node_comp(comp)), priv_value_traits_ptr());
}
template<class KeyType, class KeyTypeKeyCompare>
iterator find(const KeyType &key, KeyTypeKeyCompare comp) {
return iterator(algo::find(_header.this_ptr(), key, key_node_comp(comp)), priv_value_traits_ptr());
}
template<class KeyType, class KeyTypeKeyCompare>
const_iterator find(const KeyType &key, KeyTypeKeyCompare comp) const {
return const_iterator(algo::find(_header.this_ptr(), key, key_node_comp(comp)), priv_value_traits_ptr());
}
template<class ElemCompare>
iterator insert(const_iterator hint, Elem& value, ElemCompare cmp) {
algo::insert_commit_data commit_data;
std::pair<node_ptr, bool> ret =
algo::insert_unique_check(_header.this_ptr(),
hint.pointed_node(),
key_of_value()(value),
key_node_comp(cmp),
commit_data);
return ret.second ? insert_unique_commit(value, commit_data)
: iterator(ret.first, priv_value_traits_ptr());
}
};
template<typename Elem,
intrusive_set_external_comparator_member_hook Elem::* PtrToMember>
const typename intrusive_set_external_comparator<Elem, PtrToMember>::value_traits intrusive_set_external_comparator<Elem, PtrToMember>::_value_traits;