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diff --git a/cpp/demo/book/map_filesystem/Parser.h b/cpp/demo/book/map_filesystem/Parser.h
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+++ b/cpp/demo/book/map_filesystem/Parser.h
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+// **********************************************************************
+//
+// Copyright (c) 2003-2009 ZeroC, Inc. All rights reserved.
+//
+// This copy of Ice is licensed to you under the terms described in the
+// ICE_LICENSE file included in this distribution.
+//
+// **********************************************************************
+
+#ifndef PARSER_H
+#define PARSER_H
+
+#include <Ice/Ice.h>
+#include <Filesystem.h>
+#include <list>
+#include <stdio.h>
+
+//
+// Stuff for flex and bison
+//
+
+#define YYSTYPE std::list<std::string>
+#define YY_DECL int yylex(YYSTYPE* yylvalp)
+YY_DECL;
+int yyparse();
+
+//
+// I must set the initial stack depth to the maximum stack depth to
+// disable bison stack resizing. The bison stack resizing routines use
+// simple malloc/alloc/memcpy calls, which do not work for the
+// YYSTYPE, since YYSTYPE is a C++ type, with constructor, destructor,
+// assignment operator, etc.
+//
+#define YYMAXDEPTH  10000
+#define YYINITDEPTH YYMAXDEPTH // Initial depth is set to max depth, for the reasons described above.
+
+//
+// Newer bison versions allow to disable stack resizing by defining
+// yyoverflow.
+//
+#define yyoverflow(a, b, c, d, e, f) yyerror(a)
+
+class Parser;
+typedef IceUtil::Handle<Parser> ParserPtr;
+
+class Parser : public IceUtil::SimpleShared
+{
+public:
+    Parser(const Filesystem::DirectoryPrx&);
+
+    void usage();
+    void list(bool);
+    void list(const Filesystem::DirectoryPrx&, bool, int);
+    void createFile(const ::std::list< ::std::string>&);
+    void createDir(const ::std::list< ::std::string>&);
+    void pwd();
+    void cd(const ::std::string&);
+    void cat(const ::std::string&);
+    void write(::std::list< ::std::string>&);
+    void destroy(const ::std::list< ::std::string>&);
+
+    void getInput(char*, int&, int);
+    void continueLine();
+    const char* getPrompt();
+
+    void error(const char*);
+    void error(const std::string&);
+
+    void warning(const char*);
+    void warning(const std::string&);
+
+    int parse(bool = false);
+
+private:
+    ::std::list<Filesystem::DirectoryPrx> _dirs;
+
+    bool _continue;
+    int _errors;
+};
+
+extern Parser* parser; // The current parser for bison/flex
+
+#endif