我在这方面已经研究了一段时间了，但我似乎还是搞不清楚。我无法编译代码，因为它一直抛出以下错误。基本上，我试图做的是创建一个向量，其中包含使用指针的基类和派生类的对象。

Final Assignment.obj:错误LNK2019:在函数“public:__thiscall SaleProduct::SaleProduct（char，class std::Basic_String，class std::Allocator>，int，double，double）”（？？0SaleProduct@@qae@dv？$Basic_String@du？$CHAR_Traits@d@std@@v？$Allocator@d@2@@std@@hnn@z)中引用了未解析的外部符号“public:__thiscall Product::Product（

#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <iomanip>
#include <vector>
#include <string>
using namespace std;

class Product
{


public:

Product();
Product(char iT,string des,int inv,double p,double dis)
{
invType = iT;
description = des;
inventory = inv;
price = p;
discount = dis;
}

char getInvType(){
return invType;
}

protected:
char invType ;
string description;
int inventory;
double price;
double discount;
};

class SaleProduct:public Product {

public:



//SaleProduct();
SaleProduct(char iT,string des,int inv,double p,double dis){


}


};



int main()
{
int choice = 0;
// SaleProduct* SaleProductOB;
// Product *productPoint = &ProductOB;
 vector<Product*> inventoryVec;

  char invType;
  string description;
  int inventory;
  double price;
  double discount = 0;




ifstream inFile("Inventory.txt");

if (inFile.is_open()){

while (inFile >> invType >> description >> inventory >> price >>discount){

      if (invType == 'S'){

           inventoryVec.push_back(new SaleProduct(invType,description,inventory,price,discount)  );
     }else{
    //inventoryVec.push_back(new Product(invType,description,inventory,price,discount)  );

      }

}
}else{
cout << "File is not ready!";
}



cout << inventoryVec.size() << endl;


while (choice != 3) {
        cout << "Please enter your choice:" << endl;
        cout << "1. Print available items"  << endl;
        cout << "2. Add item to cart"       << endl;
        cout << "3. Print receipt and quit" << endl << endl;

        cin >> choice;
 }








//system("PAUSE");
return 0;
}