-int str2x(const std::string & str, int & x);
-int str2x(const std::string & str, unsigned & x);
-int str2x(const std::string & str, long & x);
-int str2x(const std::string & str, unsigned long & x);
+int str2x(const std::string & str, int32_t & x);
+int str2x(const std::string & str, uint32_t & x);