Умные указатели на структуру с шаблоном

#pragma once
#include <vector>
#include <memory>
 
 
using namespace std;
 
template <class T>
struct Selem
{
    T elem;
    shared_ptr <Selem<T> > next;
    vector <weak_ptr <Selem<T> > > ptr;
};
 
template <class T>
class Clayer_list
{
private:
    Selem<T> elems;
public:
 
 
    Clayer_list(void)
    {
        elems.next = nullptr;
    }
 
    ~Clayer_list(void)
    {
 
    }
    void add(T add_elemT)
    {
        auto new_elem_sp = make_shared <Selem<T>> (1);
        //new_elem_sp->next = elems.next;
        //new_elem_sp->elem = add_elemT;
        //elems.next = new_elem_sp;
 
 
 
    }
};

    void add(T add_elemT)
    {
        shared_ptr<Selem<T>> new_elem_sp(new Selem<T>);
        new_elem_sp->next = elems.next;
        new_elem_sp->elem = add_elemT;
        elems.next = new_elem_sp;
    }

vector <weak_ptr<SRectangle>> rectangles;
for(auto &i : rectangles)
    {
        shared_ptr <SRectangle> ptr = i.lock();

SRectangle * nr = new SRectangle;
                figure_general.ptr = make_shared<SRectangle> (*nr); 
                fin  >>nr->x1 >> nr->y1 >>nr->x2 >> nr->y2 ;
                figure_general.type_figure = Sfigure_general::Erectangle;
                rectangles.push_back(make_shared<SRectangle>(*nr));