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diff --git a/common/session/custom/test.hxx b/common/session/custom/test.hxx
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+// file      : common/session/custom/test.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef TEST_HXX
+#define TEST_HXX
+
+#include <string>
+#include <memory>
+#include <vector>
+
+#include <odb/core.hxx>
+#include <odb/lazy-ptr.hxx>
+
+class employee;
+
+#pragma db object pointer(std::shared_ptr) session
+class employer
+{
+public:
+  employer (const std::string& name, const std::string& symbol)
+      : name_ (name), symbol_ (symbol) {}
+
+  const std::string&
+  name () const {return name_;}
+
+  const std::string&
+  symbol () const {return symbol_;}
+
+  void
+  symbol (const std::string& symbol) {symbol_ = symbol;}
+
+  // Employees of this employer.
+  //
+  typedef std::vector<odb::lazy_weak_ptr<employee>> employees_type;
+
+  const employees_type&
+  employees () const {return employees_;}
+
+  employees_type&
+  employees () {return employees_;}
+
+  // Change tracking.
+  //
+public:
+  bool
+  changed (const employer& orig) const
+  {
+    // Note that we don't need to track object ids, inverse pointers, nor
+    // readonly/const data members.
+    //
+    return symbol_ != orig.symbol_;
+  }
+
+private:
+  friend class odb::access;
+  employer () {}
+
+  #pragma db id
+  std::string name_;
+
+  std::string symbol_;
+
+  #pragma db value_not_null inverse(employer_)
+  employees_type employees_;
+};
+
+#pragma db object pointer(std::shared_ptr) session
+class employee
+{
+public:
+  typedef ::employer employer_type;
+
+  employee (const std::string& first,
+            const std::string& last,
+            std::shared_ptr<employer_type> employer)
+      : first_ (first), last_ (last), employer_ (employer) {}
+
+  // Name.
+  //
+  const std::string&
+  first () const {return first_;}
+
+  const std::string&
+  last () const {return last_;}
+
+  // Employer.
+  //
+  std::shared_ptr<employer_type>
+  employer () const {return employer_;}
+
+  void
+  employer (std::shared_ptr<employer_type> e) {employer_ = e;}
+
+  // Change tracking.
+  //
+public:
+  bool
+  changed (const employee& orig) const
+  {
+    return first_ != orig.first_ || last_ != orig.last_ ||
+      employer_ != orig.employer_;
+  }
+
+private:
+  friend class odb::access;
+  employee () {}
+
+  #pragma db id auto
+  unsigned long id_;
+
+  std::string first_;
+  std::string last_;
+
+  #pragma db not_null
+  std::shared_ptr<employer_type> employer_;
+};
+
+#endif // TEST_HXX