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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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