Begin converting URL struct into modern C++ class

dlib/dlib.h

@@ -124,6 +124,13 @@ void dStr_sprintfa (Dstr *ds, const char *format, ...);
 int  dStr_cmp(Dstr *ds1, Dstr *ds2);
 char *dStr_memmem(Dstr *haystack, Dstr *needle);
 const char *dStr_printable(Dstr *in, int maxlen);
+#ifdef __cplusplus
+extern "C++"
+{
+#include <string>
+}
+std::string dStr_printable_std(const std::string &in, int maxlen);
+#endif
 
 /*
  *-- dList --------------------------------------------------------------------