从预定义的缓冲区构造数组

Question

我有一个C ++赋值，构建我自己的简单数组列表，我应该实现这个构造函数，析构函数和一个add函数：
MyCollection.h

    template<typename T>
    class MyCollection
    {
    private: //the private members are mine
        Node<T> *current; 
        int current_index;
        int count;
        void Empty();
    public:
        MyCollection(char * pBuffer, unsigned nBufferSize);//Constructs the array from a pre-defined buffer.
        ~MyCollection();
        T * Add();  
    }

template <typename T>
struct Node
{
  T value;
  Node *next;
  Node *previous;
};

MyCollection.cpp 我的实施

template<typename T>
MyCollection<T>::MyCollection(char * pBuffer, unsigned nBufferSize)
{
    count=0;
//what to do here ???
}

template<typename T>
MyCollection<T>::~MyCollection()
{
    Empty();
}

template<typename T>
T * MyCollection<T>::Add()
{
    if(items>=capacity)
    {
        throw "Out of capacity";
    }
    Node<T> *dummy;
    dummy = new(Node<T>);

    dummy->value = new T;

    if(current == NULL)
    {
        current=dummy;  
    }
    else
    {
        current->next=dummy;  
        dummy->previous=current;
        current=dummy;
    }
    count++;
    return &(current->value);
}

现在，我不知道在构造函数中做了什么？这些论点是什么？

我也获得了主要部分：

int _tmain(int argc, _TCHAR* argv[]) {
    if (argc < 2) { 
        printf("Usage:\nTest.exe buffersize (in KB)\n");  
        return EXIT_FAILURE; 
    } 
    unsigned nBufferSize = atoi(argv[1]) * 1024; 
    char * pBuffer = new char[nBufferSize]; 
    MyCollection<CTestClass> oArray(pBuffer, nBufferSize);
    //???
    return 0;
}