扩展的线性表

时间 2019-12-24

原文原文链接

测试函数

/*
 * 测试例，主函数位于这个文件中
 * extendedChain.cpp
*/
#include<iostream>
#include<numeric>
#include"extendedchain.h"

using namespace std;

int main(void)
{
    extendedChain<int> y;
    y.insert(0,2);
    y.insert(1,6);
    y.insert(0,1);
    y.insert(2,4);
    y.insert(3,5);
    y.insert(2,3);
    cout<<"after insert some elements:"<<endl;
    cout<<"size of y = "<<y.size()<<endl;

    y.erase(4);
    y.erase(0);
    y.push_back(6);
    cout << "List y should be 1 2 3 6" << endl;
    cout << "Size of y = " << y.size() << endl;
    cout << y << endl;

    y.insert(3,4);
    y.insert(0,0);
    cout << "List y should be 0 1 2 3 4" << endl;
    cout << "Size of y = " << y.size() << endl;
    cout << y << endl;

    y.clear();
     y.push_back(1);
     y.push_back(2);
     y.push_back(3);
     cout << "Appended 3 integers, list y should be 1 2 3" << endl;
     cout << "Size of y = " << y.size() << endl;
     cout << y << endl;


     //迭代器这部分的测试是有问题的，代码老是提示未定义的错误，还未找到问题点。之后再找。
     /******************************************************************/
     // 测试 iterator
     /*
     cout << "Ouput using forward iterators pre and post ++" << endl;
     for (extendedChain<int>::iterator i = y.begin();
          i != y.end(); i++)
        cout << *i << "  ";
     cout << endl;
     for (extendedChain<int>::iterator i = y.begin();
          i != y.end(); ++i)
     {
        cout << *i << "  ";
        *i += 1;
     }
     cout << endl;
  
     cout << "Incremented by 1 list is " << y << endl;
     
     // try out an STL algorithm
     int sum = accumulate(y.begin(), y.end(), 0);
     cout << "The sum of the elements is " << sum << endl;
     */
    /*******************************************************************************/
    return 0;
}

扩展的线性表的抽象类：

/*
 * 扩展的抽象线性表的类，其中只是在原有线性表抽象类的基础上，添加了几个抽象函数
 * extendedLinearList.h
*/
#ifndef EXTENDEDLINEARLIST_H
#define EXTENDEDLINEARLIST_H

#include<iostream>
#include"linearlist.h"

using namespace std;

template<class T>
class extendedLinearList : linearList<T>
{
public:
    virtual ~extendedLinearList(){}
    virtual void clear() = 0;//删除链表
    virtual void push_back(const T& theELement) = 0;//在链表尾部插入新元素
};

#endif // EXTENDEDLINEARLIST_H

扩展后的链表添加了lastNode指针，是一个指向链表的尾节点的指针。
利用lastNode指针，能够在时间复杂度为O(1)的状况下在链表尾部插入新元素。
数据成员lastNode有时须要更改，由于在删除和插入元素的时候会改变尾节点，这时就要更新指向尾节点的指针lastNode。
如下的extendedChain要完成的工做有：node

声明一个数据成员lastNode
提供改进的erase()和insert()代码
定义在linearList中剩余的纯虚函数，使其调用类chain的相应方法
实现方法clear()和push_back()

类extendedChain的实现：

/*
 * 扩展后的链表的具体类实现
 * extendedChain.h
*/
#ifndef EXTENDEDCHAIN_H
#define EXTENDEDCHAIN_H

#include<iostream>
#include<sstream>
#include<string>
#include"extendedlinearlist.h"
#include"chainwithiterator.h"
#include"myexceptions.h"

using namespace std;

template<class T>
class extendedChain : public extendedLinearList<T>,public chain<T>
{
public:
    extendedChain(int initialCapacity = 10):
        chain<T>(initialCapacity){}
    extendedChain(const extendedChain<T>& c):
        chain<T>(c){}

    /*
     * 各个函数的实现和声明
    */
    bool empty()const{return listSize == 0;}
    int size() const{return listSize;}
    T& get(int theIndex) const
    {
        return chain<T>::get(theIndex);
    }
    int indexOf(const T &theELement) const
    {
        return chain<T>::indexOf(theELement);
    }
    void erase(int theIndex);
    void insert(int theIndex,const T& theElement);

    //子类中新添加的函数，功能是删除链表
    void clear()
    {
        while(firstNode != NULL)
        {
            chainNode<T>* nextNode = firstNode->next;
            delete firstNode;
            firstNode = nextNode;
        }
        listSize = 0;
    }

    //子类中新添加的元素，功能为在链表尾部插入新元素
    void push_back(const T& theElement);

    void output(ostream& out) const
    {
        chain<T>::output(out);
    }

    //清空链表
    void zero()
    {
        firstNode = NULL;
        listSize = 0;
    }

    //迭代器类的定义
    class iterator
    {
    public:
        typedef forward_iterator_tag iterator_category;
        typedef T value_type;
        typedef ptrdiff_t difference_type;
        typedef T* pointer;
        typedef T& reference;

        //构造函数
        iterator(chainNode<T>* theNode = NULL)
        {
            node = theNode;
        }

        T& operator*() const{return node->element;}
        T* operator->() const{return &node->element;}

        //前加
        iterator& operator++()
        {
            node = node->next;
            return *this;
        }

        //后加
        iterator operator++(int)
        {
            iterator old = *this;
            node = node->next;
            return old;
        }

        //不等于
        bool operator!=(const iterator right) const
        {
            return node != right.node;
        }

        //等于
        bool operator == (const iterator right) const
        {
            return node = right.node;
        }

    protected:
        chainNode<T>* node;
    };


    //迭代器
    iterator bebin(){return iterator(firstNode);}
    iterator end(){return iterator(NULL);}

protected:
    chainNode<T>* lastNode = NULL;
    chainNode<T>* firstNode = NULL;
    void checkIndex(int theIndex) const;
    int listSize = 0;
};

template<class T>
void extendedChain<T>::erase(int theIndex)
{
    checkIndex(theIndex);

    chainNode<T>* deleteNode;
    if(theIndex == 0)
    {
        deleteNode = firstNode;
        firstNode = firstNode->next;
    }
    else
    {
        chainNode<T>* p = firstNode;
        for(int i = 0;i < theIndex-1;i++)
        {
            p = p->next;
        }
        deleteNode = p->next;
        p->next = p->next->next;
        if(deleteNode == lastNode)
            lastNode = p;
    }
    listSize--;
    delete deleteNode;
}


template<class T>
void extendedChain<T>::insert(int theIndex, const T &theElement)
{
    if(theIndex < 0 || theIndex > listSize)
    {
        ostringstream s;
        s <<"index = "<<theIndex << " size = "<<listSize;
        throw illegalIndex(s.str());
    }
    if(theIndex == 0)
    {
        firstNode = new chainNode<T>(theElement,firstNode);
        if(listSize == 0)
            lastNode = firstNode;
    }
    else
    {
        chainNode<T>* p = firstNode;
        for(int i = 0;i < theIndex-1;i++)
        {
            p = p->next;
        }
        p->next = new chainNode<T>(theElement,p->next);
        if(listSize == theIndex)
            lastNode = p->next;
    }
    listSize++;
}

template<class T>
void extendedChain<T>::push_back(const T& theElement)
{
    chainNode<T>* newNode = new chainNode<T>(theElement,NULL);
    if(firstNode == NULL)
        firstNode = lastNode = newNode;
    else
    {
        lastNode->next = newNode;
        lastNode = newNode;
    }
    listSize++;
}

template<class T>
void extendedChain<T>::checkIndex(int theIndex) const
{
    if(theIndex < 0 || theIndex >= listSize)
    {
        ostringstream s;
        s <<"index = "<<theIndex<<" size = "<<listSize;
        throw illegalIndex(s.str());
    }
}
#endif // EXTENDEDCHAIN_H

其余类的实现

chainNode.hios

/*
 * 链表节点定义
 * chainNode.h
*/
#ifndef CHAINNODE_H
#define CHAINNODE_H

template<class T>
struct chainNode
{
    //节点元素
    T element;
    chainNode<T> *next;

    //构造函数
    chainNode(){}

    //复制构造函数
    chainNode(const T& element)
    {
        this->element = element;
    }

    chainNode(const T &element,chainNode<T>* next)
    {
        this->element = element;
        this->next = next;
    }
};


#endif // CHAINNODE_H

chainWithIterator.h函数

/*
 * 加入了迭代器的链表
 * chainWithIterator.h
*/
#ifndef CHAINWITHITERATOR_H
#define CHAINWITHITERATOR_H

#include<iostream>
#include<sstream>
#include<string>
#include"linearlist.h"
#include"chainnode.h"
#include"myexceptions.h"

using namespace std;

class linkedDigraph;
template <class T> class linkedWDigraph;


template<class T>
class chain : public linearList<T>
{
    friend linkedDigraph;
    friend linkedWDigraph<int>;
    friend linkedWDigraph<float>;
    friend linkedWDigraph<double>;

public:
    //构造函数
    chain(int initialCapacity = 10);

    //复制构造函数
    chain(const chain<T>&);

    //析构函数
    ~chain();

    //判断链表是否空
    bool empty() const{return listSize == 0;}

    //链表元素个数
    int size() const{return listSize;}

    //获取索引指向的元素
    T& get(int theIndex) const;

    //获取元素指向的索引
    int indexOf(const T& theElement) const;

    //删除索引指向的元素
    void erase(int theIndex);

    //在索引位置插入元素
    void insert(int theIndex,const T& theElement);

    //将链表元素插入输出流
    void output(ostream &out) const;

    //迭代器
    class iterator;
    iterator bebin(){return iterator(firstNode);}
    iterator end(){return iterator(NULL);}

    //迭代器类的定义
    class iterator
    {
    public:
        typedef forward_iterator_tag iterator_category;
        typedef T value_type;
        typedef ptrdiff_t difference_type;
        typedef T* pointer;
        typedef T& reference;

        //构造函数
        iterator(chainNode<T>* theNode = NULL)
        {
            node = theNode;
        }

        T& operator*() const{return node->element;}
        T* operator->() const{return &node->element;}

        //前加
        iterator& operator++()
        {
            node = node->next;
            return *this;
        }

        //后加
        iterator operator++(int)
        {
            iterator old = *this;
            node = node->next;
            return old;
        }

        //不等于
        bool operator!=(const iterator right) const
        {
            return node != right.node;
        }

        //等于
        bool operator == (const iterator right) const
        {
            return node = right.node;
        }

    protected:
        chainNode<T>* node;
    };
protected:
    void checkIndex(int theIndex) const;//检查索引是否合法
    chainNode<T>* firstNode;//指向链表第一个元素
    int listSize;//链表元素个数
};


/*
 * 类中某些函数的具体实现
*/
template<class T>
chain<T>::chain(int initialCapacity)
{
    if(initialCapacity < 1)
    {
        ostringstream s;
        s <<"Initial capacity = "<<initialCapacity<<"Must be > 0";
        throw illegalParameterValue(s.str());
    }
    firstNode = NULL;
    listSize = 0;
}

template<class T>
chain<T>::chain(const chain<T> &theList)
{
    listSize = theList.listSize;
    if(listSize == 0)
    {
        firstNode = NULL;
        return;
    }

    //链表非空
    chainNode<T>* sourceNode = theList.firstNode;
    firstNode = new chainNode<T>(sourceNode->element);
    sourceNode = sourceNode->next;

    chainNode<T>* targetNode = firstNode;
    while(sourceNode != NULL)
    {
        targetNode->next = new chainNode<T>(sourceNode->element);
        targetNode = targetNode->next;
        sourceNode = sourceNode->next;
    }
    targetNode->next = NULL;
}

template<class T>
chain<T>::~chain()
{
    chainNode<T> *nextNode;
    while(firstNode != NULL)
    {
        nextNode = firstNode->next;
        delete firstNode;
        firstNode = nextNode;
    }
}

template<class T>
void chain<T>::checkIndex(int theIndex) const
{
    if(theIndex < 0 || theIndex >= listSize)
    {
        ostringstream s;
        s <<"index = " <<theIndex <<" size = "<<listSize;
        throw illegalIndex(s.str());
    }
}

template<class T>
T& chain<T>::get(int theIndex) const
{
    checkIndex(theIndex);

    chainNode<T>* currentNode = firstNode;
    for(int i = 0;i<theIndex;i++)
    {
        currentNode = currentNode->next;
    }
    return currentNode->element;
}

template<class T>
int chain<T>::indexOf(const T &theElement) const
{
    chainNode<T>* currentNode = firstNode;
    int index = 0;
    while(currentNode != NULL &&
          currentNode->element != theElement)
    {
        currentNode = currentNode->next;
        index++;
    }
    if(currentNode == NULL)
        return -1;
    else
        return index;
}

template<class T>
void chain<T>::erase(int theIndex)
{
    checkIndex(theIndex);
    chainNode<T>* deleteNode;
   if(theIndex == 0)
   {
       deleteNode = firstNode;
       firstNode = firstNode->next;
   }
   else
   {
       chainNode<T>* p = firstNode;
       for(int i = 0;i < theIndex -1;i++)
       {
           p = p->next;
       }
       deleteNode = p->next;
       p->next = p->next->next;
   }
   listSize--;
   delete deleteNode;
}


template<class T>
void chain<T>::insert(int theIndex, const T &theElement)
{
    if(theIndex < 0 || theIndex > listSize)
    {
        ostringstream s;
        s <<"index = "<<theIndex <<" size = "<<listSize;
        throw illegalIndex(s.str());
    }

    if(theIndex == 0)
    {
        firstNode = new chainNode<T>(theElement,firstNode);
    }
    else
    {
        chainNode<T>* p = firstNode;
        for(int i = 0;i < theIndex;i++)
            p = p->next;

        p->next = new chainNode<T>(theElement,p->next);
    }
    listSize++;
}


template<class T>
void chain<T>::output(ostream &out) const
{
    for(chainNode<T>* currentNode = firstNode;
                        currentNode != NULL;
                        currentNode = currentNode->next)
    {
        out<<currentNode->element<< " ";
    }
}
template<class T>
ostream& operator<<(ostream& out,const chain<T>& x)
{
    x.output(out);
    return out;
}


#endif // CHAINWITHITERATOR_H

linearList.hpost

/*
 * 旧的线性表的抽象类
 * linearList.h
*/
#ifndef LINEARLIST_H
#define LINEARLIST_H

#include<iostream>
using namespace std;

template<class T>
class linearList
{
public:
    virtual ~linearList(){}
    virtual bool empty() const = 0;
    virtual int size() const = 0;
    virtual T& get(int theIndex) const = 0;
    virtual int indexOf(const T& theELement) const = 0;
    virtual void erase(int theIndex) = 0;
    virtual void insert(int theIndex,const T& theElement)=0;
    virtual void output(ostream& out) const = 0;
};

#endif // LINEARLIST_H

myExceptions.h测试

/*
 * 异常类的定义和实现
 * myException.h
*/
#ifndef MYEXCEPTIONS_H
#define MYEXCEPTIONS_H

#include<string>
using namespace std;

//非法参数
class illegalParameterValue
{
public:
    illegalParameterValue(string theMessage = "Illegal parameter value")
    {
        message = theMessage;
    }
    void outputMessage()
    {
        cout <<message <<endl;
    }
private:
    string message;
};

//非法输入的数据
class illegalInputData
{
public:
    illegalInputData(string theMessage = "Illegal data input")
    {
        message = theMessage;
    }

    void outputMessage()
    {
        cout<<message<<endl;
    }
private:
    string message;
};

//非法索引
class illegalIndex
{
public:

    illegalIndex(string theMessage = "Illegal Index")
    {
        message = theMessage;
    }

    void outputMessage()
    {
        cout<<message<<endl;
    }
private:
    string message;
};

#endif // MYEXCEPTIONS_H