Smart pointers and map in C++ - c++

Question

I'm trying to execute this program with smart pointers:
//File user.h
#include <list>
#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include <memory>
#include <map>
using namespace std;
class User {
string name;
int id;
public:
User(const string& name, int id) : name(name), id(id) {}
int getID() const {return id;}
~User(){}
};
//File main.c
#include "user.h"
using namespace std;
typedef std::shared_ptr<User> UserPtr;
typedef map<string, UserPtr> Dict;
int main()
{
Dict dict;
dict = new User("Adams", 666);
auto it = dict.find("Adams");
if (it == dict.end())
cout << "not found!" << endl;
else
cout << "id3: " << it->second->getID() << endl;
return 0;
}
I have tested it before with raw pointers (*) and it works. Nonetheless, when using smart pointers I get the following errors:
main.cpp: In function ‘int main()’:
main.cpp:15:10: error: no match for ‘operator=’ (operand types are ‘Dict {aka std::map<std::basic_string<char>, std::shared_ptr<User> >}’ and ‘User*’)
dict = new User("Adams", 666);
^
main.cpp:15:10: note: candidates are:
In file included from /usr/include/c++/4.8/map:61:0,
from user.h:10,
from main.cpp:3:
/usr/include/c++/4.8/bits/stl_map.h:264:7: note: std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compare, _Alloc>::operator=(const std::map<_Key, _Tp, _Compare, _Alloc>&) [with _Key = std::basic_string<char>; _Tp = std::shared_ptr<User>; _Compare = std::less<std::basic_string<char> >; _Alloc = std::allocator<std::pair<const std::basic_string<char>, std::shared_ptr<User> > >]
operator=(const map& __x)
^
/usr/include/c++/4.8/bits/stl_map.h:264:7: note: no known conversion for argument 1 from ‘User*’ to ‘const std::map<std::basic_string<char>, std::shared_ptr<User> >&’
/usr/include/c++/4.8/bits/stl_map.h:279:7: note: std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compare, _Alloc>::operator=(std::map<_Key, _Tp, _Compare, _Alloc>&&) [with _Key = std::basic_string<char>; _Tp = std::shared_ptr<User>; _Compare = std::less<std::basic_string<char> >; _Alloc = std::allocator<std::pair<const std::basic_string<char>, std::shared_ptr<User> > >]
operator=(map&& __x)
^
/usr/include/c++/4.8/bits/stl_map.h:279:7: note: no known conversion for argument 1 from ‘User*’ to ‘std::map<std::basic_string<char>, std::shared_ptr<User> >&&’
/usr/include/c++/4.8/bits/stl_map.h:300:7: note: std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compare, _Alloc>::operator=(std::initializer_list<std::pair<const _Key, _Tp> >) [with _Key = std::basic_string<char>; _Tp = std::shared_ptr<User>; _Compare = std::less<std::basic_string<char> >; _Alloc = std::allocator<std::pair<const std::basic_string<char>, std::shared_ptr<User> > >]
operator=(initializer_list<value_type> __l)
^
/usr/include/c++/4.8/bits/stl_map.h:300:7: note: no known conversion for argument 1 from ‘User*’ to ‘std::initializer_list<std::pair<const std::basic_string<char>, std::shared_ptr<User> > >’
Is the smart pointer wrongly declared?

Answer 1

Dict is std::map and you are trying to assign a pointer to a User to it which is wrong.
What you need is
dict["Adams"] = std::make_shared<User>("Adams", 666);