模板自定义数组

Posted 2022-03-17 无痕恋雪

制造通用模板，创建自定义的数组

自定义数组.hpp--文件

#pragma once
#include<iostream>
using namespace std;
#include<string>
template<class T>
class Myarry

public:
  Myarry() ;//自己创建有参构造，编译器就不提供无参构造，所以必须自己写一次无参构造，即使是空实现也要写！
  Myarry(int capacity)//有参构造函数
  
    this->capacity = capacity;
    this->size = 0;
    this->marry = new T[this->capacity];//把数组创建在堆区
  
  ~Myarry()//析构函数
  
    if (this->marry !=NULL)
    
      delete []this->marry;//析构数组必须加[]，否则会引发断点
      marry = NULL;
      this->capacity = 0;
      this->size = 0;
    
  
  Myarry(const Myarry& arr)//拷贝构造
  
    this->capacity = arr.capacity;
    this->size = arr.size;
    this->marry = new T[arr.capacity];
    for (int i = 0; i < arr.size; i++)//把数据拷贝过来
    
      this->marry[i] = arr->marry[i];
    
  
  //等号赋值
  Myarry& operator=(const Myarry& arr)
  
    if (this->marry != NULL)//如果有数据先清空，再赋值
    
      delete[]this->marry;
      this->marry  = NULL;
      this->size = 0;
      this->capacity = 0;
    
    this->capacity = arr.capacity;
    this->size = arr.size;
    this->marry = new T[this->capacity];
    for (int i = 0; i < this->size; i++)//将数据进行拷贝
    
      this->marry[i] = arr.marry[i];
    
    return *this;
  
  void pushback(const T&ptr)//尾加法
  
    if (this->capacity == this->size)
    
      cout << "容量已满！" << endl;
      return;
    
    this->marry[this->size] = ptr;
    this->size++;
  
  void deleteback()//尾删法
  
    if (this->size == 0)
    
      cout << "数据为零，没有可删数据！" << endl;
    
    delete this->marry[this->size - 1];
    this->size--;
  
  T & operator[](int index)//通过下标访问数组,并使它作为左值加&
  
    if (index > this->capacity)
    
      cout << "访问越界！" << endl;
      exit(0);
    
    return this->marry[index];
  
  int gercapacity()//获取数组容量
  
    return this->capacity;
  
  int getsize()//获取数组元素个数
  
    return this->size;
  
private:
  T * marry;//数组
  int capacity;//数组容量
  int size;//数组元素个数
;

测试文件

#include "自定义数组.hpp"
class person

public:
  person()
  
    this->age = 0;
  
  int age;
  string name;
;
void text01()

  person p[4];
  p[0].age = 20;
  p[0].name = "张三";
  p[1].age = 0;
  p[1].name = "李四";
  p[2].age = 40;
  p[2].name = "王五";
  p[3].age = 80;
  p[3].name = "赵六";
  Myarry<person>pp(10);
  for (int i = 0; i < 4; i++)
  
    pp.pushback(p[i]);
  
  for (int i = 0; i < pp.getsize(); i++)
  
    cout << pp[i].name<<pp[i].age<< endl;
  

void text02()

  Myarry<int>inta(10);
  for (int i = 0; i < 5; i++)
  
    inta.pushback(i);
  
  for (int i = 0; i < inta.getsize(); i++)
  
    cout << inta[i] << endl;
  

int main()

  /*text02();*/
  text01();
  return 0;