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diff --git a/src/constexp_p.h b/src/constexp_p.h
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+/******************************************************************************
+ *
+ * Copyright (C) 1997-2019 by Dimitri van Heesch.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation under the terms of the GNU General Public License is hereby 
+ * granted. No representations are made about the suitability of this software 
+ * for any purpose. It is provided "as is" without express or implied warranty.
+ * See the GNU General Public License for more details.
+ *
+ * Documents produced by Doxygen are derivative works derived from the
+ * input used in their production; they are not affected by this license.
+ *
+ */
+
+#ifndef _CONSTEXP_P_H
+#define _CONSTEXP_P_H
+
+#include <qcstring.h>
+
+//! @file
+//! @brief Private interface between Parser (constexp.y) and Lexer (constexp.l)
+
+#include "cppvalue.h"
+#define YYSTYPE CPPValue
+
+typedef void* yyscan_t;
+struct constexpYY_state
+{
+  QCString    strToken;
+  CPPValue    resultValue;
+  int         constExpLineNr;
+  QCString    constExpFileName;
+
+  const char *inputString;
+  int         inputPosition;
+};
+constexpYY_state* constexpYYget_extra(yyscan_t yyscanner );
+
+extern int constexpYYlex(YYSTYPE *lvalp, yyscan_t);
+extern int constexpYYparse(yyscan_t);
+
+
+#endif