C++模板类实现顺序表

C++模板类实现顺序表

#include<iostream>
#include<assert.h>
#include<string>
using namespace std;
#pragma warning(disable:4996)

template<class T>
class Seqlist //定义一个顺序表的类
{
public:
    Seqlist() //构造函数
        :_a(NULL), _size(0), _capacity(0)
    {}
    Seqlist(const Seqlist<T> &s) //拷贝构造函数
    {
        _a = new T[s._size];
//memcpy(_a, s._a, sizeof(T)*s._size);
for (size_t i = 0; i < s._size; ++i)
        {
            _a[i] = s._a[i];
        }
        _size = s._size;
        _capacity = s._size;
    }
void Swap(Seqlist& s) //交换函数
    {
        swap(_a, s._a);
        swap(_size, s._size);
        swap(_capacity, s._capacity);
    }
    Seqlist<T>& operator=(Seqlist<T> s) //赋值运算符的重载
    {
this->Swap(s);
return *this;
    }
    ~Seqlist() //析构函数
    {
if (_a != NULL)
        {
delete[] _a;
//free(_a);
            _size = _capacity = 0;
        }
    }
void PushBack(const T& x) //尾插
    {
        CheekCapacity();
        _a[_size] = x;
        _size++;
    }
void PushFront(const T& x) //头插
    {
        CheekCapacity();
for (size_t i = _size; i > 0; i--)
        {
            _a[i] = _a[i - 1];
        }
        _a[0] = x;
        _size++;
    }
void CheekCapacity() //检查容量及扩容函数
    {
if (_size >= _capacity)
        {
            _capacity = _capacity * 2 + 3;
            T* tmp = new T[_capacity];
if (_a != NULL)
            {
//memcpy(tmp, _a, sizeof(T)*_size); 适用于内置类型
for (size_t i = 0; i < _size; ++i)
                {
                    tmp[i] = _a[i];
                }
delete[] _a;
            }
            _a = tmp;
        }
    }
void Print() //显示函数
    {
for (size_t i = 0; i < _size; ++i)
        {
cout << _a[i] << " ";
        }
cout << endl;
    }
void PopBack() //尾删函数
    {
        assert(_size>0);
        --_size;
    }

void PopFront() //头删
    {
        assert(_size > 0);
for (size_t i = 0; i < _size; i++)
        {
            _a[i] = _a[i + 1];
        }
        --_size;
    }
void Insert(size_t pos, T x) //指定位置前插入函数
    {
        assert(pos > 0 && pos < _size);
for (size_t i = _size; i >= pos; i--)
        {
            _a[i] = _a[i - 1];
        }
        _a[pos - 1] = x;
        _size++;
    }
void Delete(size_t pos) //指定位置前删除函数
    {
        assert(pos>0 && pos < _size);
for (size_t i = pos - 1; i < _size; i++)
        {
            _a[i] = _a[i + 1];
        }
        _size--;
    }
int Find(T x) //查找函数
    {
for (size_t i = 0; i < _size; i++)
        {
if (_a[i] == x)
            {
return i + 1;
            }
else
continue;
        }
    }
private:
    T *_a;
    size_t _size;
    size_t _capacity;
};

void test1() //int类型数据的后插
{
    Seqlist<int> s1;
    s1.PushBack(1);
    s1.PushBack(2);
    s1.PushBack(3);
    s1.PushBack(4);
    s1.Print();
}
void test2() //字符串的后插
{
    Seqlist<string> s2;
    s2.PushBack("123");
    s2.PushBack("456");
    s2.PushBack("789");
    s2.PushBack("qwertyuioplkjhgfdsa");
    s2.Print();
}

void test3() //拷贝构造之int
{
    Seqlist<int> s3;
    s3.PushBack(1);
    s3.PushBack(2);
    s3.PushBack(3);
    s3.PushBack(4);
    Seqlist<int> s4(s3);
    s3.Print();
    s4.Print();
}

void test4() //拷贝构造之string字符串
{
    Seqlist<string> s5;
    s5.PushBack("123");
    s5.PushBack("456");
    s5.PushBack("789");
    s5.PushBack("qwertyuioplkjhgfdsa");
    s5.Print();
    Seqlist<string> s6(s5);
    s6.Print();
}

void test5() //尾删
{
    Seqlist<string> s7;
    s7.PushBack("123");
    s7.PushBack("456");
    s7.PushBack("789");
    s7.PushBack("qwertyuioplkjhgfdsa");
    s7.Print();
    s7.PopBack();
    s7.PopBack();
    s7.PopBack();
    s7.PopBack();
    s7.Print();
}

void test6()//查找和指定位置之前的插入和删除指定位置之前的元素
{
    Seqlist<int> s8;
    s8.PushBack(1);
    s8.PushBack(2);
    s8.PushBack(3);
    s8.PushBack(4);
    s8.Print();
cout << s8.Find(1) << endl;
    s8.Insert(1, 0);
    s8.Print();
    s8.Delete(1);
    s8.Print();
}
void test7() //头插
{
    Seqlist<int> s9;
    s9.PushFront(1);
    s9.PushFront(2);
    s9.PushFront(3);
    s9.PushFront(4);
    s9.Print();
}
void test8() //头删
{
    Seqlist<int> s10;
    s10.PushFront(1);
    s10.PushFront(2);
    s10.PushFront(3);
    s10.PushFront(4);
    s10.Print();
    s10.PopFront();
    s10.PopFront();
    s10.PopFront();
    s10.PopFront();
    s10.Print();
}

int main()
{
//test1();
//test2();
//test3();
//test4();
//test5();
//test6();
//test7();
    test8();
    system("pause");
return 0;
}

拷贝构造和上述图片中也一样，需要采用合适的方法，简单地说这里的memcpy拷贝适用于内置类型，不适合string。