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#include <map>
#include <string>
#include <iostream>
 
template<typename T, typename F>
void ForEachOf(T&& map, F&& func) {
    for(auto& pair : map) {
        func(pair.first, pair.second);
    }
}
 
int main(void) {
	std::map<int, std::string> m { {1, "foo"}, {3, "bar"}};
    ForEachOf({ {1, "foo"}, {3, "bar"}}, [](auto key, auto value) {
        ::std::cout << key << value;
    });
}
 

prog.cpp: In function 'int main()':
prog.cpp:16:6: error: no matching function for call to 'ForEachOf(<brace-enclosed initializer list>, main()::<lambda(auto:1, auto:2)>)'
     });
      ^
prog.cpp:6:6: note: candidate: template<class T, class F> void ForEachOf(T&&, F&&)
 void ForEachOf(T&& map, F&& func) {
      ^
prog.cpp:6:6: note:   template argument deduction/substitution failed:
prog.cpp:16:6: note:   couldn't deduce template parameter 'T'
     });
      ^

Standard output is empty