This is an example C++ class using C++11 features and ROOT.

test.cpp

#include "iostream"
#include "map"
#include "TString.h"

int main(int argc, char const *argv[])
{
  std::map<int, TString>myMap {
    {2, "Hello"},
    {4, "There"},
    {8, "Stranger"},
  };
  for (auto& kv: myMap) {
    std::cout << kv.first << ": " << kv.second << std::endl;
  }
  return 0;
}

To compile, do

$ clang++ -std=c++11 -Wall `root-config --libs` `root-config --cflags` test.cpp -o test; ./test