c++ - std::unique_ptr instantiate error trying to place inside std::map? -

so i'm using sfml , boost libraries trying write resourcemanager class. i'm using std::map contain resources. have heard std::unique_ptr because of memory cleanup (or along lines).

this resourcemanager class looks like:

#pragma once  #include <boost/any.hpp> #include <map> #include <memory> #include <sfml/graphics.hpp>  #include "resource.h"   class resourcemanager {     public:         resourcemanager();         void clear();         void dump();         boost::any getresource(std::string s);         sf::texture loadtexture(std::string s, sf::intrect d);         void unloadtexture(std::string s);      private:         std::map<std::string, std::unique_ptr<boost::any>> resource; }; 

here method i'm trying use load objects map

sf::texture resourcemanager::loadtexture(std::string s, sf::intrect d) {     std::unique_ptr<sf::texture> t;      if (!t->loadfromfile(s, d))         std::cout << "error loading resource: " << s << std::endl;      resource[s] = t; } 

however error here @ line:

std::unique_ptr move-only time, meaning cannot copy it.

to fix it, use std::move:

resource[s] = std::move (t); 

if copied did, have 2 unique_ptr's pointing same object (which non-sense since unique), must move it, calling move-assignment-operator.