LinkedList

本文介绍了一个通用的模板链表类的实现,包括插入、删除、查找等基本操作,并提供了链表的排序、反转等功能。该链表类使用C++模板实现,支持多种数据类型。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

#ifndef LINKEDLIST_H
#define LINKEDLIST_H

#include <iostream>
#include <cassert>

#ifndef INS_FRONT_OR_REAR
#define INS_FRONT_OR_REAR
enum INS_MOD { INS_FRONT, INS_REAR };
#endif

template<typename T>
struct LinkedNode {
  T data;
  LinkedNode<T> *link;
  LinkedNode(LinkedNode<T> *ptr = nullptr) {
    link = ptr;
  }
  LinkedNode(const T& item, LinkedNode<T> *ptr = nullptr) {
    data = item;
    link = ptr;
  }
};

template<typename T>
class  LinkedList {
public:
  LinkedList() { first = new LinkedNode<T>; }
  LinkedList(const T& x) { first = new LinkedNode<T>(x); }
  LinkedList(LinkedList<T>& l);
  ~LinkedList() {
    clear();
    delete first;
  }

  void clear();
  int length() const;

  LinkedNode<T> *getHead() const { return first; }
  LinkedNode<T> *search(const T& x);
  LinkedNode<T> *locate(int i);

  bool getData(int i ,T& x) const;
  void setData(int i, T& x);

  bool insert(int i, T& x);
  bool remove(int i, T& x);

  bool is_empty() const { return first->link == nullptr; }
  void sort();
  void inverse();

  void input(T endtag, INS_MOD mod = INS_REAR);
  void output();

  LinkedList<T>& operator=(LinkedList<T>& L);

  friend ostream& operator<<(ostream& os, LinkedList<T> &L) {
    LinkedNode<T>& current = L.first->link;
    while (current != nullptr) {
      os << current->data << "\t";
      current = current->link;
    }
    os << endl;
    return os;
  }

  friend istream& operator>>(LinkedList<T>& L) {
    LinkedNode<T> *newNode, *last;
    T value;
    L.clear();
    last = L.last;
    while (!in.eof()) {
      in >> value;
      newNode = new LinkedNode<T>(value);
      assert(newNode != nullptr);
      last->link = newNode;
      last = newNode;
    }
    last->link = nullptr;
    return in;
  }

protected:
  LinkedNode<T> *first;
  void inputFront(T endtag);
  void inputRear(T endtag);
};

templatet<typename T>
LinkedList<T>::LinkedList(LinkedList<T>& L) {
  T value;
  LinkedNode<T> *src = L.first();
  LinkedNode<T> *dest = first = new LinkedNode<T>;

  while (src->link != nullptr) {
    value = src->link->data;
    dest->link = new LinkedNode<T>(value);
    dest = dest->link;
    src = src->link;
  }
  dest->link = nullptr;
}

template<typename T>
void LinkedList<T>::clear() {
  LinkedNode<T> *p;
  while (first->link != nullptr) {
    p = first->link;
    first->link = p->link;
    delete p;
  }
}

template<typename T>
int LinkedList<T>::length() const {
  LinkedNode<T> *p = first->link;
  int count = 0;
  while (p) {
    p = p->link;
    count++;
  }
  return count;
}

template<typename T>
LinkedNode<T> *LinkedList<T>::search(const T& x) {
  LinkedNode<T> *current = first->link;
  while (current != nullptr && current->data != x) {
    current = current->link;
  }
  return current;
}

template<typename T>
LinkedNode<T> *LinkedList<T>::locate(int i) {

}

template<typename T>
bool LinkedList<T>::getData(int i, T& x) const {
  if (i <= 0)
    return nullptr;
  LinkedNode<T> *current = locate(i);
  if (current == nullptr)
    return false;
  else {
    x = current->data;
    return true;
  }
}

template<typename T>
void LinkedList<T>::setData(int i, T& x) {
  if (i <= 0)
    return 0;
  LinkedNode<T> *current = locate(i);
  if (current == nullptr)
    return;
  else
    return current->data = x;
}

template<typename T>
bool LinkedList<T>::insert(int i, T& x) {
  LinkedNode<T> *current = locate(i);
  if (current == nullptr)
    return false;
  LinkedNode<T> *newnode = new LinkedNode<T>(x);
  if (newnode == nullptr) {
    std::cerr << "mem alloc error !" << std::endl;
    exit(1);
  }
  newnode->link = current->link;
  current->link = newnode;
  return true;
}

template<typename T>
bool LinkedList<T>::remove(int i, T& x) {
  LinkedNode<T> *current = locate(i - 1);
  if (current == nullptr || current->link == nullptr)
    return false;
  LinkedNode<T> *delnode = current->link;
  current->link = delnode->link;
  x = delnode->data;
  delete del;
  return true;
}

template<typename T>
void LinkedList<T>::output() {
  LinkedNode<T> *current = first->link;
  while (current != nullptr) {
    std::cout << current->data << endl;
    current = current->link;
  }
}

template<typename T>
LinkedList<T>& LinkedList<T>::operator=(LinkedList<T>& L) {
  T value;
  LinkedNode<T> *src = L.first;
  LinkedNode<T> *dest = first;
  clear();
  while (src->link != nullptr) {
    value = src->link->data;
    dest->link = new LinkedNode<T>(value);
    dest = dest->link;
    src = src->link;
  }
  dest->link = nullptr;
  return *this;
}

template<typename T>
void LinkedList<T>::input(T endtag, INS_MOD mod) {
  if (mod == INS_FRONT)
    input_front(endtag);
  else
    input_rear(endtag);
}

template<typename T>
void LinkedList<T>::input_front(T endtag) {
  LinkedNode<T> *newnode;
  T value;
  while (value != endtag) {
    newnode = new LinkedNode<T>(value);
    if (newnode == nullptr) {
      std::cerr << "mem alloc error !" << std::endl;
      exit(1);
    }
    newnode->link = first->link;
    first->link = newnode;
    std::cin >> value;
  }
}

template<typename T>
void LinkedList<T>::inputrear(T endtag) {
  LinkedNode<T> *newnode;
  LinkedNode<T> *last = first;
  T value;
  while (last->link != nullptr)
    last = last->link;
  std::cin >> value;
  while (value != endtag) {
    newnode = new LinkedNode<T>(value);
    if (newnode == nullptr) {
      std::err << " mem alloc error !" << std::endl;
      exit(1);
    }
    last->link = newnode;
    last = newnode;
    std::cin >> value;
  }
  last->link == nullptr;
}

template<typename T>
void LinkedList<T>::inverse() {
  LinkedNode<T> *t, *p, *q;
  t = nullptr;
  p = first->link;
  while (p != nullptr p->link != nullptr) {
    q = t;
    t = p;
    p = t->link;
    t->link = q;
  }
  first->link = t;
}
#endif // LINKEDLIST_H








评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值