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310 lines
7.1 KiB
C++
310 lines
7.1 KiB
C++
// vim: set sts=8 ts=2 sw=2 tw=99 et:
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//
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// Copyright (C) 2013, David Anderson and AlliedModders LLC
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of AlliedModders LLC nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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#ifndef _include_amtl_linkedlist_h_
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#define _include_amtl_linkedlist_h_
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#include <new>
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#include <stdlib.h>
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#include <am-allocator-policies.h>
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#include <am-utility.h>
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#include <am-moveable.h>
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namespace ke {
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// LinkedList, analagous to std::list or SourceHook::List. Since it performs a
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// malloc() and free() on every contained node, it should be avoided unless
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// absolutely necessary, or for when allocation performance is not a factor. It
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// is provided here to safely port old AlliedModders code to AMTL.
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//
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// In order to use a circular chain, LinkedList's allocation size includes
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// exactly one T. If T is very large, LinkedList should be allocated on the
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// heap, to avoid using the stack.
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template <class T, class AllocPolicy = SystemAllocatorPolicy>
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class LinkedList : public AllocPolicy
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{
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public:
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friend class iterator;
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class Node
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{
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public:
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Node(const T &o)
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: obj(o)
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{
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}
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Node(Moveable<T> o)
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: obj(o)
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{
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}
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T obj;
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Node *next;
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Node *prev;
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};
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public:
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LinkedList(AllocPolicy = AllocPolicy())
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: length_(0)
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{
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head()->prev = head();
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head()->next = head();
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}
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~LinkedList() {
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clear();
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}
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bool append(const T &obj) {
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return insertBefore(end(), obj) != end();
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}
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bool append(Moveable<T> obj) {
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return insertBefore(end(), obj) != end();
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}
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bool prepend(const T &obj) {
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return insertBefore(begin(), obj) != begin();
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}
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bool prepend(Moveable<T> obj) {
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return insertBefore(begin(), obj) != begin();
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}
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size_t length() const {
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return length_;
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}
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void clear() {
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Node *node = head()->next;
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Node *temp;
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head()->next = head();
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head()->prev = head();
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// Iterate through the nodes until we find the sentinel again.
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while (node != head()) {
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temp = node->next;
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freeNode(node);
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node = temp;
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}
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length_ = 0;
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}
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bool empty() const {
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return (length_ == 0);
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}
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T &front() {
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assert(!empty());
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return head()->next->obj;
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}
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T &back() {
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assert(!empty());
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return head()->prev->obj;
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}
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private:
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const Node *head() const {
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return sentinel_.address();
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}
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Node *head() {
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return sentinel_.address();
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}
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Node *allocNode(const T &obj) {
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Node *node = (Node *)this->malloc(sizeof(Node));
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if (!node)
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return NULL;
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new (node) Node(obj);
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return node;
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}
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Node *allocNode(Moveable<T> obj) {
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Node *node = (Node *)this->malloc(sizeof(Node));
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if (!node)
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return NULL;
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new (node) Node(obj);
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return node;
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}
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void freeNode(Node *node) {
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node->obj.~T();
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this->free(node);
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}
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private:
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StorageBuffer<Node> sentinel_;
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size_t length_;
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public:
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class iterator
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{
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friend class LinkedList;
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public:
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iterator()
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: this_(NULL)
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{
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}
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iterator(const LinkedList &src)
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: this_(src.head())
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{
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}
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iterator(Node *n)
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: this_(n)
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{
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}
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iterator(const iterator &where)
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: this_(where.this_)
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{
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}
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iterator &operator --() {
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if (this_)
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this_ = this_->prev;
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return *this;
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}
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iterator operator --(int) {
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iterator old(*this);
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if (this_)
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this_ = this_->prev;
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return old;
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}
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iterator &operator ++() {
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if (this_)
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this_ = this_->next;
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return *this;
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}
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iterator operator ++(int) {
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iterator old(*this);
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if (this_)
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this_ = this_->next;
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return old;
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}
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const T &operator * () const {
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return this_->obj;
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}
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T &operator * () {
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return this_->obj;
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}
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T *operator ->() {
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return &this_->obj;
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}
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const T *operator ->() const {
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return &(this_->obj);
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}
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bool operator !=(const iterator &where) const {
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return (this_ != where.this_);
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}
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bool operator ==(const iterator &where) const {
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return (this_ == where.this_);
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}
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operator bool() {
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return !!this_;
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}
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private:
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Node *this_;
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};
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private:
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// Insert obj right before where.
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iterator insert(iterator where, Node *node) {
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if (!node)
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return where;
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Node *pWhereNode = where.this_;
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pWhereNode->prev->next = node;
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node->prev = pWhereNode->prev;
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pWhereNode->prev = node;
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node->next = pWhereNode;
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length_++;
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return iterator(node);
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}
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public:
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iterator begin() {
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return iterator(head()->next);
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}
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iterator end() {
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return iterator(head());
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}
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iterator erase(iterator where) {
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Node *pNode = where.this_;
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iterator iter(where);
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iter++;
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pNode->prev->next = pNode->next;
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pNode->next->prev = pNode->prev;
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freeNode(pNode);
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length_--;
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return iter;
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}
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iterator insertBefore(iterator where, const T &obj) {
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return insert(where, allocNode(obj));
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}
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iterator insertBefore(iterator where, Moveable<T> obj) {
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return insert(where, allocNode(obj));
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}
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public:
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// Removes one instance of |obj| from the list, if found.
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void remove(const T &obj) {
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for (iterator b = begin(); b != end(); b++) {
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if (*b == obj) {
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erase(b);
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break;
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}
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}
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}
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template <typename U>
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iterator find(const U &equ) {
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for (iterator iter = begin(); iter != end(); iter++) {
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if (*iter == equ)
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return iter;
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}
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return end();
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}
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private:
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// These are disallowed because they basically violate the failure handling
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// model for AllocPolicies and are also likely to have abysmal performance.
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LinkedList &operator =(const LinkedList<T> &other) KE_DELETE;
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LinkedList(const LinkedList<T> &other) KE_DELETE;
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};
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} // namespace ke
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#endif //_INCLUDE_CSDM_LIST_H
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