c++使用模板类实现vector

#pragma once

#include 


template  class CVector
{

private:
    //global pointer address
    T* arr;
    //vector capacity size
    int capacity;
    // used size in current vector value list;(!!! length)
    int current;

public:

    CVector()
    {
        arr = new T[1];
        capacity = 1;
        current = 0;
    }

    ~CVector()
    {
        delete[] arr;
        capacity = 0;
        current = 0;
    }

    // Function to add an element at the last
    void Push(T data)
    {
        // if current == capacity; double the vector capacity
        if (IsFull()) Reserve();
        // Inserting data
        arr[current] = data;
        current++;
    }

    // function to add element at any index
    void Push(T data, int index)
    {
        if (index >= capacity)
        {
            printf(" index out of vector range n");
            return ;
        }   
        else