/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef LIBMEMUNREACHABLE_LINKED_LIST_H_
#define LIBMEMUNREACHABLE_LINKED_LIST_H_

template<class T>
class LinkedList {
public:
    LinkedList() : next_(this), prev_(this), data_() {}
    explicit LinkedList(T data) : LinkedList() {
        data_ = data;
    }
    ~LinkedList() {}
    void insert(LinkedList<T>& node) {
        assert(node.empty());
        node.next_ = this->next_;
        node.next_->prev_ = &node;
        this->next_ = &node;
        node.prev_ = this;
    }
    void remove() {
        this->next_->prev_ = this->prev_;
        this->prev_->next_ = this->next_;
        this->next_ = this;
        this->prev_ = this;
    }
    T data() { return data_; }
    bool empty() { return next_ == this && prev_ == this; }
    LinkedList<T> *next() { return next_; }
private:
    LinkedList<T> *next_;
    LinkedList<T> *prev_;
    T data_;
};

template<class T>
class LinkedListHead {
public:
    LinkedListHead() : node_() {}
    ~LinkedListHead() {}

private:
    LinkedList<T> node_;
};

#endif