C++单链表基本算法实现

C++单链表基本算法实现

#ifndef LinkList_h
#define LinkList_h
#include <iostream>
using namespace std;
template <class T>
struct Node{
    T data;
    struct Node<T> * next;
};
template <class T>
class LinkList
{
public:
    LinkList(){front = new Node<T>; front->next = NULL;}
    LinkList(T a[],int n);
    ~LinkList();
    void PrintList();
    int GetLength();
    Node<T> * Get(int i);
    int Locate(T x);
    void Insert(int i, T x);
    T Delete(int i);
    
private:
    Node<T> * front;
};
template <class T>
LinkList<T>::LinkList(T a[], int n){
//    front = new Node<T>;    //头插法
//    front->next = NULL;
//    for(int i = n-1; i>=0; i--){
//        Node<T> *s = new Node<T>;
//        s->data = a[i];
//        s->next = front->next;
//        front->next = s;
//    }
    front = new Node<T>;  //尾插法
    Node <T> * r = front;
    for(int i = 0;i<n;i++){
        Node <T> *s = new Node<T>;
        s->data = a[i];
        r->next = s;
        r = s;
    }
    r->next = NULL;
}
template <class T>
LinkList<T>::~LinkList(){
    Node <T> *p = front;
    while(p){
        front = p;
        p = p->next;
        delete front;
    }
}
template <class T>
Node<T> *LinkList<T>::Get(int n){
    Node<T>* p = front->next;
    int j = 1;
    while (p && (j != n)){
        p = p->next;
        j++;
    }
    if(!p) throw "查找位置非法";
    else return p;
}
template <class T>
int LinkList<T>::Locate(T x){
    Node<T> * p = front->next;
    int j = 1;
    while(p){
    
        if(p->data == x){
            return j;
        }else{
            p = p->next;
            j++;
        }
    }
    return -1;
}
template <class T>
void LinkList<T>::Insert(int i, T x){
    Node<T>* p = front;
    p = Get(i);
    if(p){
        Node <T>*s = new Node <T>;
        s->data = p->data;
        s->next = p->next;
        p->next = s;
        p->data = x;
    }
    else{ throw "位置插入错误";}
}
template <class T>
T LinkList<T>::Delete(int i){
    Node <T> *p = front;
    if(i!=1) p = Get(i-1);
    Node<T>*q = p->next;
    p->next = q->next;
    T x = q->data;
    delete q;
    return x;
    
}
template <class T>
int LinkList<T>::GetLength(){
    if(!front->next) return 0;
    Node <T> *p = front->next;
    int j = 0;
    while(p){
        p = p->next;
        j++;
    }
    return j;
}
template <class T>
void  LinkList<T>::PrintList(){
    Node <T> *p = front->next;
    if(!p) {cout<< "链表为空列表！"<<endl; return; }
    cout<<"按顺序单链表的各个数据元素是："<<endl;
    while(p){
        cout<<p->data<<" ";
        p= p->next;
    }
    cout << endl;
}
#endif /* LinkList_h */