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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef LIBMEMUNREACHABLE_LINKED_LIST_H_
     18 #define LIBMEMUNREACHABLE_LINKED_LIST_H_
     19 
     20 template<class T>
     21 class LinkedList {
     22 public:
     23     LinkedList() : next_(this), prev_(this), data_() {}
     24     LinkedList(T data) : LinkedList() {
     25         data_ = data;
     26     }
     27     ~LinkedList() {}
     28     void insert(LinkedList<T>& node) {
     29         assert(node.empty());
     30         node.next_ = this->next_;
     31         node.next_->prev_ = &node;
     32         this->next_ = &node;
     33         node.prev_ = this;
     34     }
     35     void remove() {
     36         this->next_->prev_ = this->prev_;
     37         this->prev_->next_ = this->next_;
     38         this->next_ = this;
     39         this->prev_ = this;
     40     }
     41     T data() { return data_; }
     42     bool empty() { return next_ == this && prev_ == this; }
     43     LinkedList<T> *next() { return next_; }
     44 private:
     45     LinkedList<T> *next_;
     46     LinkedList<T> *prev_;
     47     T data_;
     48 };
     49 
     50 template<class T>
     51 class LinkedListHead {
     52 public:
     53     LinkedListHead() : node_() {}
     54     ~LinkedListHead() {}
     55 
     56 private:
     57     LinkedList<T> node_;
     58 };
     59 
     60 #endif
     61