C++循环链表的实现

// .hpp文件
#include <stdio.h>
class NodeCList{
public:
    NodeCList();
    static NodeCList* create(int element);

    int element;
    NodeCList* next;
};

class CircleList {
public:
    CircleList();
    static CircleList* create();
    void append(NodeCList* node);
    void insertAtFirst(NodeCList* node);
    void insert(NodeCList* node, int index);
    NodeCList* find(int index);
    int find(NodeCList* node);
    void remove(int index);
    void clear();
    void printContent();

public:
    NodeCList* rear;
    int length;
};

//.cpp文件
NodeCList:: NodeCList():next(nullptr){
}
NodeCList* NodeCList::create(int element){
    auto node = new (std::nothrow) NodeCList();
    node->element = element;
    return node;
}

CircleList::CircleList():rear(nullptr),length(0){

}

CircleList* CircleList::create(){
    return new(std::nothrow) CircleList();
}
void CircleList::append(NodeCList *node){
    if (!node) return;
    if (!this->rear){
        this->rear = node;
        node->next = this->rear;
    } else{
        node->next = this->rear->next;
        this->rear->next = node;
        this->rear = node;
    }

    this->length ++;
}
void CircleList::insertAtFirst(NodeCList *node){
    if (this->length == 0){
        this->rear = node;
        node->next = this->rear;
    } else{
        node->next = this->rear->next;
        this->rear->next = node;
    }
    this->length ++;
}

void CircleList::insert(NodeCList *node, int index){
    if (index < 0 || index > this->length){
        CCLOG("index error.");
        return;
    }
    if (index == 0){
        this->insertAtFirst(node);
    } else if (index == this->length){
        this->append(node);
    } else{
        auto tmp = this->find(index - 1);
        node->next = tmp->next;
        tmp->next = node;
        this->length ++;
    }
}

NodeCList* CircleList::find(int index){
    if (index < 0 || index > this->length - 1){
        CCLOG("index error.");
        return nullptr;
    }
    auto temp = this->rear->next;
    for (int i = 0; i < index; i++){
        temp = temp->next;
    }
    return temp;
}

int CircleList::find(NodeCList *node){
    auto tmp = this->rear->next;
    for (int i = 0; i < this->length; i++){
        if (node->element == tmp->element){
            return i;
        }
        tmp = tmp->next;
    }
    return -1;
}

void CircleList::remove(int index){
    if (index < 0 || index > this->length - 1 || this->length == 0) {
        CCLOG("index error.");
        return;
    }
    if (this->length == 1){
        this->clear();
    }

    if (index == 0){
        this->rear->next = this->find(0)->next;
        this->length --;
    } else{
        this->find(index - 1)->next = this->find(index)->next;
        this->length --;
    }
}

void CircleList::printContent(){
    std::string str = "";
    auto temp = this->rear->next;
    for (int i = 0; i < this->length; i++){
        printf("第%d个为: %d", i, temp->element);
        printf("
");
        temp = temp->next;
    }
}

void CircleList::clear(){
    this->length = 0;
    this->rear = nullptr;
}