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#include <map>
#include <string>
#include <iostream>
 
struct MockMapItem {
    std::string property;
 
	MockMapItem(const std::string& value) : property(value) {
  		std::cout << "We constructed a new MockMapItem with a string!" << std::endl;
 
	}
};
 
typedef typename std::map<std::string, const MockMapItem&& > ItemMap;
 
int main()
{
    MockMapItem map_item("some string value");
 
	ItemMap themap;
	themap.emplace("something", std::move(map_item));
 
}

prog.cpp:14:60: error: template argument 2 is invalid
 typedef typename std::map<std::string, const MockMapItem&& > ItemMap;
                                                            ^
prog.cpp:14:60: error: template argument 4 is invalid
prog.cpp:14:62: error: 'ItemMap' in namespace 'std' does not name a type
 typedef typename std::map<std::string, const MockMapItem&& > ItemMap;
                                                              ^
prog.cpp:14:62: warning: 'typedef' was ignored in this declaration
prog.cpp: In function 'int main()':
prog.cpp:20:2: error: 'ItemMap' was not declared in this scope
  ItemMap themap;
  ^
prog.cpp:21:2: error: 'themap' was not declared in this scope
  themap.emplace("something", std::move(map_item));
  ^
prog.cpp:21:30: error: 'move' is not a member of 'std'
  themap.emplace("something", std::move(map_item));
                              ^

Standard output is empty