如何修复C ++中的“未定义引用”错误

Question

我正在尝试编译一个使模板实例化的函数，但我没有运气，并且通过debug显示的错误告诉我： 未定义对`DynamicArray :: DynamicArray（unsigned int）的引用 我已经尝试过在平台上找到的许多解决方案，但仍然无法弄清代码中的问题

-1- Main.cpp文件：

#include <iostream>
#include <vector>
#include <string>
#include <stdexcept>
#include "DynamicArray.h"
using namespace std;
int main()
{
    cout << "**** Testing the Dynamic Array ****" << endl << endl;
    TestOne();
    return 0;
}

-2- DynamicArray.h文件：

template<typename T>
class DynamicArray
{

    public:
        //DynamicArray();
        DynamicArray(unsigned int ssize);
        void initialize(unsigned int );
        void expand();
        void Add(const T& );
        void Resize(int );
        const int& GetCapacity()const { return 18 ; }

        const int& GetSize()const { return this->nOfEl;}
         T& operator[] (const int index);

        virtual ~DynamicArray();

    protected:
    private:
        int cap;
        int nOfEl;
        T **arr;


};

-3- DynamicArray.cpp文件：

#include "DynamicArray.h"
#include <cstddef>


template<typename T>
DynamicArray<T>::DynamicArray(unsigned int ssize)
{
    this->cap = 5;
    this->nOfEl = 0;
    this->arr = new T*[this->cap];
    initialize();

}

template<typename T>
DynamicArray<T>::~DynamicArray()
{
   for(size_t i=0; i < nOfEl ; i++)
   {
    delete this->arr[i];
   }
   delete[]this->arr;

}

template<typename T>
void DynamicArray<T>::initialize(unsigned int from)
{
    for(size_t i = from ; i<cap ; i++)
    {
        this->arr[i] = nullptr;
    }

}

template<typename T>
void DynamicArray<T>::expand()
{
   this.cap *= 2;
   T **tempArr = new  T*[this.cap];

   for(size_t i = 0 ; i < this.nOfEl ; i++)
   {
       tempArr[i] = new T(this->arr[i]);
   }
    for(size_t i=0; i < nOfEl ; i++)
   {
    delete this->arr[i];
   }
   delete[]this->arr;
   this->arr = tempArr;
   initialize();
}

template<typename T>
void DynamicArray<T>::Add(const T& element)
{
    if(this->nOfEl >= this.cap)
    {
        this.expand();
    }
    this->arr[this->nOfEl++] = new T(element);

}


template<typename T>
void DynamicArray<T>::Resize(int newsize)
{

   T **tempArr =  new T*[newsize];

   for(size_t i = 0 ; i < newsize ; i++)
   {
       tempArr[i] = new T(this->arr[i]);
   }
   newsize++;
    for(size_t i=newsize; i < nOfEl ; i++)
   {
    delete this->arr[i];
   }
   delete[]this->arr;
   this->arr = tempArr;
   initialize(newsize);
}