在C中使用模板

Design a template class named FlexArray which offers flexible array
indexes. The user of the class can set the lower index and upper
index when the object is declared.

Examples of user code:

FlexArray a (1,5); // lower index is 1 and the upper index is
5 FlexArray b(-5,10); // lower index is -5 and the upper
index is 10

Provide the following functions for your class:

1. default constructor
2. parameterized constructor in which the user specified lower index and upper index
3. destructor
4. copy constructor
5. assignment operator
6. overloaded [ ] operator with similar semantics to [ ] already used with built-in arrays.

Errors on PRE conditions may be handled with assert statements or
try/catch blocks. There is no resizing of the array offered.
Subscripts must be in range.

这本书真的没有帮助创建模板.我希望有人能够就这个问题向我提供一些方向,看看我的代码是否在正确的轨道上.我试图通过本书非常有限的范围和在线的不同资源来开始这个问题：

#ifndef H_templates
#define H_templates

#include <iostream>
using namespace std;

template <typename T>           
class FlexArray
{  public:                  
    FlexArray();            // POST: empty FlexArray
    FlexArray(LI,UI);               // POST: Parameterized Constructor
    ~FlexArray();           // POST: destructor
    CopyArr(Array* sourceArray,Array* destinationArray,size);             // POST: Copies array

    //Overloading the assignment operators to add arrays(?) Unsure if
    // this is what is meant by the original question
    FlexArray operator+
      (const FlexArray& otherFlexArray) const;
      //Overload the operator +
    FlexArray operator-
      (const FlexArray& otherFlexArray) const;
      //Overload the operator -
    FlexArray operator[]
      (const FlexArray& otherFlexArray) const;
      //Overload the operator []

private:
    T FlexArray[size];      // Flex array   
    int size;               // number of items Array
    int LI;                 //Lower Index
    int UI;                 //Upper Index
};

template <typename T>  
FlexArray<T>::FlexArray ()  
// POST: empty FlexArray
{    size = 0;  }

template <typename T>  
FlexArray<T>::~FlexArray()  
// POST: destructor
{    }
template <typename T>  
FlexArray<T>::CopyArr( Array* sourceArray,size)   
//Pre: Takes 3 arguments,the original array,the array to copy too,and,the size of array
// POST: Copies the array
{   
    for(int i=0; i<size; i++){
        sourceArray[i] = destinationArray[i]
    }
}

#endif