What is the way to push the list elements into map in c++

how to retreive the list values to a map which contains the details that are stored in map.Once after the push back i have the list of maps inside the list.

my List is declared like std::list<std::map<const std::string,std::string>> myList and map is declared as : std::map<const std::string,std::string>mapLine

Now the list contains details of map like below: myList<<mapLine1>,<mapLine2>....etc>

so How do I take out the mapLine1 which is in the myList and fill into another map called mapLine2

mapLine2 is declared as std::map<const std::string,std::string> mapLine2

please dont remove or mark this question as invalid