Помещение структуры в список

struct TBaseStruct
{
  int a;
}
 
struct TParentStruct : TBaseStruct
{
  int b;
    TParentStruct & operator = (const TParentStruct & ps)
    {
      this->b = ps.b;
      this->a = ps.a;
    }
}
 
class TOper
{
  private:
   TParentStruct ps1;
   TParentStruct ps2;
  public:
   TOper (const TParentStruct &in1, const TParentStruct &in2)
    {
       ps1 = in1; ps2 = in2;
    }
}
 
 
TParentStruct A1, A2;
 
A1.a = 1;
A1.b = 2;
 
A2.a = 3;
A2.b = 4;
 
list <TOper> listOper;
TOper Oper(A1, A2);
listOper.push_back(Oper);

#include <iostream>
#include <list>
using namespace std;
 
struct TBaseStruct
{
    int a;
};
 
struct TParentStruct : TBaseStruct
{
    int b;
    TParentStruct & operator = (const TParentStruct & ps)
    {
        this->b = ps.b;
        this->a = ps.a;
    }
};
 
class TOper
{
    private:
        TParentStruct ps1;
        TParentStruct ps2;
    public:
        TOper (const TParentStruct &in1, const TParentStruct &in2)
        {
           ps1 = in1; ps2 = in2;
        }
        TParentStruct getPs1()
        {
            return this->ps1;
        }
        TParentStruct getPs2()
        {
            return this->ps2;
        }
};
 
int main() {
    TParentStruct A1, A2;
     
    A1.a = 1;
    A1.b = 2;
     
    A2.a = 3;
    A2.b = 4;
     
    list <TOper> listOper;
    TOper Oper(A1, A2);
    listOper.push_back(Oper);
 
    for (auto elem : listOper) {
        cout << elem.getPs1().a << endl;
        cout << elem.getPs1().b << endl;
        cout << elem.getPs2().a << endl;
        cout << elem.getPs2().b;
    }
    return 0;
}