C++ 自定义动态数组模板

来源:网络时间:2011-04-25

  #include "stdafx.h"

  #include <iostream>

  using namespace std;

  template <class T>

  class MyArray

  {

  int len;

  public:

  T *data;

  MyArray()

  {

  data = NULL;

  len = 0;

  }

  ~MyArray()

  {

  delete[] data;

  }

  T& operator [](int index);

  void push(T d);

  };

  template <class T>

  T& MyArray<T>::operator [](int index)

  {

  if(index<0||index>(len-1))

  {

  cout<<"Bad subscript!"<<endl;

  exit(1);

  }

  return data[index];

  }

  template <class T>

  void MyArray<T>::push(T d)

  {

  T *pdata = data;

  data = new T[len + 1];

  if(pdata != NULL)

  {

  for(int i = 0 ; i < len ; i++)

  {

  data[i] = pdata[i];

  }

  delete[] pdata;

  }

  data[len] = d;

  len++;

  }

  //测试代码

  int main(int argc, char* argv[])

  {

  MyArray<int>  a;

  a.push(11);

  a.push(22);

  a.push(33);

  a.push(55);

  a[0]=44;

  cout<<a[0]<<endl<<a[1]<<endl<<a[2]<<endl<<a[3]<<endl;

  return 0;

  }

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