#include<string>
#include<iostream>
 
namespace notstd {
  namespace adl_helper {
    using std::to_string;
 
    template<class T>
    std::string as_string( T&& t ) {
      return to_string( std::forward<T>(t) );
    }
  }
  template<class T>
  std::string to_string( T&& t ) {
    return adl_helper::as_string(std::forward<T>(t));
  }
}
namespace bob{
class my_class{
public:
  friend std::string to_string(my_class const& self) {
    return "I am " + notstd::to_string(self.i);
  }
  int i;
};
}
int main(){
	bob::my_class x{1};
	std::cout << notstd::to_string(x)<<"\n";
}

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