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diff --git a/examples/cxx/parser/multiroot/protocol.hxx b/examples/cxx/parser/multiroot/protocol.hxx
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+// file : examples/cxx/parser/multiroot/protocol.hxx
+// author : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef PROTOCOL_HXX
+#define PROTOCOL_HXX
+
+namespace protocol
+{
+ class request
+ {
+ public:
+ virtual
+ ~request ()
+ {
+ }
+
+ unsigned int
+ account () const
+ {
+ return account_;
+ }
+
+ protected:
+ request (unsigned int account)
+ : account_ (account)
+ {
+ }
+
+ private:
+ unsigned int account_;
+ };
+
+ class balance: public request
+ {
+ public:
+ balance (unsigned int account)
+ : request (account)
+ {
+ }
+ };
+
+ class withdraw: public request
+ {
+ public:
+ withdraw (unsigned int account, unsigned int amount)
+ : request (account), amount_ (amount)
+ {
+ }
+
+ unsigned int
+ amount () const
+ {
+ return amount_;
+ }
+
+ private:
+ unsigned int amount_;
+ };
+}
+
+#endif // PROTOCOL_HXX