Store maps in template class by reference - c++

Question

So lately I learnt how to copy a map's reference and the next step is that I want to store map references in a template class.
So in my main method my goal is to create map_storage where I store my maps and do different calculations on them.
Template class:
#include <map>
#include <compare>
#include <utility>
#ifndef MAPALIGN_H
#define MAPALIGN_H
template<class Key, class T, class Compare = std::less<Key> >
class map_storage
{
public:
map_storage() : size_(0), data_(new std::map<Key, T, Compare>[100]){}
void add(std::map<Key, T, Compare> &temp_map)
{
data_[size_] = temp_map;
size_ += 1;
}
void action(){
std::cout << std::endl;
std::cout << "Size on action " << size_ << std::endl;
for(int i=0; i<size_; i++){
print_map(data_[i]);
}
}
void print_map(std::map<Key, T, Compare> &temp_map){
std::cout << "Size of given map is : " << temp_map.size() << std::endl;
}
void modifyMaps(..){
....
}
private:
int size_;
std::map<Key, T, Compare>* data_;
};
#endif
When I modify the maps in data_ (add new key,values etc.) I want to see the changes in main too and the same thing for the other way around.
My question is that How can I store the references of the maps in a template class?
Example of the main method:
#include <iostream>
#include "mapalign.h"
#include <string>
#include <map>
int main()
{
std::map<std::string, int> map1;
maps_storage<std::stringm int> maps_storage;
maps_storage.add(map1);
map1["asd"] = 1;
map1["dsa"] = 2;
// This should print 1 and 2 but prints 1 and 0 because the map is not in the map_storage by reference.
map_storage.action();
return 0;
}
Output:
1
0
Expected Output:
1
2