#include <map>
#include <utility>
#include <iostream>
#include <algorithm>
 
using namespace std;
 
 
namespace {
 
    auto pair2params = [](auto&& f)
    {
    	return [f](auto&& p) {
    		f(p.first, p.second);
    	};
    };
 
}
 
 
int main()
{
    auto values = map<int, string>{
        {0, "hello"},
        {1, "world!"}
    };
 
    for_each(begin(values), end(values), pair2params([](int i, const string& s) {
        cout << i << ": " << s << endl;
    }));
}

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