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| /* | ||
| Copyright (c) 2019, 2020, MariaDB | ||
| This program is free software; you can redistribute it and/or | ||
| modify it under the terms of the GNU General Public License | ||
| as published by the Free Software Foundation; version 2 of | ||
| the License. | ||
| This program 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 this program; if not, write to the Free Software | ||
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA | ||
| */ | ||
|
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| #pragma once | ||
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| #include <cstddef> | ||
| #include <iterator> | ||
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| namespace intrusive | ||
| { | ||
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| // Derive your class from this struct to insert to a linked list. | ||
| template <class Tag= void> struct list_node | ||
| { | ||
| list_node(list_node *next= NULL, list_node *prev= NULL) | ||
| : next(next), prev(prev) | ||
| { | ||
| } | ||
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| list_node *next; | ||
| list_node *prev; | ||
| }; | ||
|
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| // Modelled after std::list<T> | ||
| template <class T, class Tag= void> class list | ||
| { | ||
| public: | ||
| typedef list_node<Tag> ListNode; | ||
| class Iterator; | ||
|
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| // All containers in C++ should define these types to implement generic | ||
| // container interface. | ||
| typedef T value_type; | ||
| typedef std::size_t size_type; | ||
| typedef std::ptrdiff_t difference_type; | ||
| typedef value_type &reference; | ||
| typedef const value_type &const_reference; | ||
| typedef T *pointer; | ||
| typedef const T *const_pointer; | ||
| typedef Iterator iterator; | ||
| typedef Iterator const_iterator; /* FIXME */ | ||
| typedef std::reverse_iterator<iterator> reverse_iterator; | ||
| typedef std::reverse_iterator<const iterator> const_reverse_iterator; | ||
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| class Iterator | ||
| { | ||
| public: | ||
| // All iterators in C++ should define these types to implement generic | ||
| // iterator interface. | ||
| typedef std::bidirectional_iterator_tag iterator_category; | ||
| typedef T value_type; | ||
| typedef std::ptrdiff_t difference_type; | ||
| typedef T *pointer; | ||
| typedef T &reference; | ||
|
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| Iterator(ListNode *node) : node_(node) {} | ||
|
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| Iterator &operator++() | ||
| { | ||
| node_= node_->next; | ||
| return *this; | ||
| } | ||
| Iterator operator++(int) | ||
| { | ||
| Iterator tmp(*this); | ||
| operator++(); | ||
| return tmp; | ||
| } | ||
|
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| Iterator &operator--() | ||
| { | ||
| node_= node_->prev; | ||
| return *this; | ||
| } | ||
| Iterator operator--(int) | ||
| { | ||
| Iterator tmp(*this); | ||
| operator--(); | ||
| return tmp; | ||
| } | ||
|
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| reference operator*() { return *static_cast<pointer>(node_); } | ||
| pointer operator->() { return static_cast<pointer>(node_); } | ||
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| bool operator==(const Iterator &rhs) { return node_ == rhs.node_; } | ||
| bool operator!=(const Iterator &rhs) { return !(*this == rhs); } | ||
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| private: | ||
| ListNode *node_; | ||
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| friend class list; | ||
| }; | ||
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| list() : sentinel_(&sentinel_, &sentinel_), size_(0) {} | ||
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| reference front() { return *begin(); } | ||
| reference back() { return *--end(); } | ||
| const_reference front() const { return *begin(); } | ||
| const_reference back() const { return *--end(); } | ||
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| iterator begin() { return iterator(sentinel_.next); } | ||
| const_iterator begin() const | ||
| { | ||
| return iterator(const_cast<ListNode *>(sentinel_.next)); | ||
| } | ||
| iterator end() { return iterator(&sentinel_); } | ||
| const_iterator end() const | ||
| { | ||
| return iterator(const_cast<ListNode *>(&sentinel_)); | ||
| } | ||
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| reverse_iterator rbegin() { return reverse_iterator(end()); } | ||
| const_reverse_iterator rbegin() const { return reverse_iterator(end()); } | ||
| reverse_iterator rend() { return reverse_iterator(begin()); } | ||
| const_reverse_iterator rend() const { return reverse_iterator(begin()); } | ||
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| bool empty() const { return size_ == 0; } | ||
| size_type size() const { return size_; } | ||
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| void clear() | ||
| { | ||
| sentinel_.next= &sentinel_; | ||
| sentinel_.prev= &sentinel_; | ||
| size_= 0; | ||
| } | ||
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| iterator insert(iterator pos, reference value) | ||
| { | ||
| ListNode *curr= pos.node_; | ||
| ListNode *prev= pos.node_->prev; | ||
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| prev->next= &value; | ||
| curr->prev= &value; | ||
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| static_cast<ListNode &>(value).prev= prev; | ||
| static_cast<ListNode &>(value).next= curr; | ||
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| ++size_; | ||
| return iterator(&value); | ||
| } | ||
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| iterator erase(iterator pos) | ||
| { | ||
| ListNode *prev= pos.node_->prev; | ||
| ListNode *next= pos.node_->next; | ||
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| prev->next= next; | ||
| next->prev= prev; | ||
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| // This is not required for list functioning. But maybe it'll prevent bugs | ||
| // and ease debugging. | ||
| ListNode *curr= pos.node_; | ||
| curr->prev= NULL; | ||
| curr->next= NULL; | ||
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| --size_; | ||
| return next; | ||
| } | ||
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| void push_back(reference value) { insert(end(), value); } | ||
| void pop_back() { erase(end()); } | ||
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| void push_front(reference value) { insert(begin(), value); } | ||
| void pop_front() { erase(begin()); } | ||
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| // STL version is O(n) but this is O(1) because an element can't be inserted | ||
| // several times in the same intrusive list. | ||
| void remove(reference value) { erase(iterator(&value)); } | ||
|
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| private: | ||
| ListNode sentinel_; | ||
| size_type size_; | ||
| }; | ||
|
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| } // namespace intrusive |
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This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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