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#ifndef _H_UTILITY_#define _H_UTILITY_#include <sstream>template <typename T>T string_cast (const std::string& in) {	T out;	std::istringstream s(in);	s >> out;	return out;}template <typename T>std::string string_cast(const T& in) {	std::ostringstream s;	s << in;	return s.str();}#endif