+int str2x(const std::string & str, int32_t & x);
+int str2x(const std::string & str, uint32_t & x);
+#ifndef WIN32
+int str2x(const std::string & str, int64_t & x);
+int str2x(const std::string & str, uint64_t & x);
+#endif
+//-----------------------------------------------------------------------------
+const std::string & x2str(uint32_t x, std::string & s);
+const std::string & x2str(uint64_t x, std::string & s);
+//-----------------------------------------------------------------------------
+const std::string & x2str(double x, std::string & s);
+//-----------------------------------------------------------------------------
+
+template <typename varT>
+int str2x(const std::string & str, varT & x);
+template <typename varT>
+const std::string & x2str(varT x, std::string & s);
+template <typename varT>
+const std::string & x2str(varT x) { std::string s; return x2str(x, s); }
+template <typename varT>
+const std::string & unsigned2str(varT x, std::string & s);