Cause a link error if we try to stream the wrong kind of string.

MouseDll/utils.hpp

@@ -16,6 +16,16 @@ inline std::string toUtf8( const std::wstring& str ) { return toUtf8(str.c_str()
 extern std::wstring fromUtf8( const char* pStr , int len=-1 ) ;
 inline std::wstring fromUtf8( const std::string& str ) { return fromUtf8(str.c_str(),str.length()) ; }
 
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
+// NOTE: These are not implemented and will generate a link error if we accidentally
+//  try to write a string to the wrong kind of stream.
+
+extern std::ostream& operator<<( std::ostream& , const wchar_t* ) ;
+extern std::ostream& operator<<( std::ostream& , const std::wstring& ) ;
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+
 #define MAKE_STRING( msg ) ( ((std::ostringstream&)((std::ostream&)std::ostringstream() << msg)).str() )
 
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