Makeclass cleaned up

luprex/core/cpp/util.hpp

@@ -18,6 +18,9 @@ using stringset = std::set<std::string>;
 std::string tolower(std::string input);
 std::string toupper(std::string input);
 
+// Return true if the string can be parsed as an integer.
+bool validinteger(const std::string &value);
+
 // String to integer.  Returns errval if the number is not parseable.
 int64_t strtoint(const std::string &value, int64_t errval);