fix reading to const string

alib2std/src/extensions/istream.cpp

@@ -16,6 +16,11 @@ std::istream & oprr ( std::istream & in, const std::string & str, bool start ) {
 	char c_in  = in.peek ( );
 	in.get ( );
+	if ( c_in == EOF ) {
+		in.clear ( std::ios::failbit );
+		return in;
+	}
+
 	if ( in.good ( ) ) {
 		if ( start && ( ( c_in == ' ' ) || ( c_in == '\n' ) || ( c_in == '\t' ) ) )
 			oprr ( in, str, start );