Как вызвать метод класса?

 User::User(string name):
       name(name),
       price(0),
       amount(0)
   {
        cout <<"User has been create";
   }
 
void User::create_drink()
{
    std::vector <User> drinks;
    drinks.push_back(User("espresso"));}

#include<string>
#include<vector>
using namespace std;
#if !defined(__UMLClassDiagram_1_User_h)
#define __UMLClassDiagram_1_User_h
 
class Drink;
class Coffeemachine;
class User
{
public:
    void delete_element(std::string val, std::vector <Drink> &drinks);
    void create_drink();
   string name;
   float price;
   float amount;
   User(string name);
   ~User();
protected:
    
private:
  
};
 
#endif

#include<string>
#include<iostream>
#include<vector>
#include"Reservoir.h"
#include"Drink.h"
#include"Coffeemachine.h"
#include"Filter.h"
#include"User.h"
#include"Clock.h"
#include"Button.h"
#include"color.h"
#include<Windows.h>
 
using namespace std;
int main()
{
    User user(string name);
    int choise =0;

user.create_drink();