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+// file      : boost/employee.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef EMPLOYEE_HXX
+#define EMPLOYEE_HXX
+
+#include <vector>
+#include <string>
+
+#include <boost/shared_ptr.hpp>
+#include <boost/weak_ptr.hpp>
+#include <boost/unordered_set.hpp>
+#include <boost/date_time/gregorian/gregorian.hpp>
+
+#include <odb/core.hxx>
+
+#include <odb/boost/smart-ptr/lazy-ptr.hxx>
+
+using boost::shared_ptr;
+using boost::weak_ptr;
+
+using odb::boost::lazy_shared_ptr;
+using odb::boost::lazy_weak_ptr;
+
+using boost::gregorian::date;
+
+// Forward declarations.
+//
+class employer;
+class employee;
+
+typedef boost::unordered_set<std::string> emails;
+typedef std::vector<lazy_weak_ptr<employee> > employees;
+
+#pragma db object
+class employer
+{
+public:
+  employer (const std::string& name)
+      : name_ (name)
+  {
+  }
+
+  const std::string&
+  name () const
+  {
+    return name_;
+  }
+
+  // Employees of this employer.
+  //
+  typedef ::employees employees_type;
+
+  const employees_type&
+  employees () const
+  {
+    return employees_;
+  }
+
+  employees_type&
+  employees ()
+  {
+    return employees_;
+  }
+
+private:
+  friend class odb::access;
+
+  employer () {}
+
+  #pragma db id
+  std::string name_;
+
+  #pragma db not_null inverse(employer_)
+  employees_type employees_;
+};
+
+#pragma db object
+class employee
+{
+public:
+  typedef ::employer employer_type;
+
+  employee (const std::string& first,
+            const std::string& last,
+            const date& born,
+            shared_ptr<employer_type> employer)
+      : first_ (first), last_ (last), born_ (born), employer_ (employer)
+  {
+  }
+
+  // Name.
+  //
+  const std::string&
+  first () const
+  {
+    return first_;
+  }
+
+  const std::string&
+  last () const
+  {
+    return last_;
+  }
+
+  // Date of birth.
+  //
+  const date&
+  born () const
+  {
+    return born_;
+  }
+
+  // Emails.
+  //
+  typedef ::emails emails_type;
+
+  const emails_type&
+  emails () const
+  {
+    return emails_;
+  }
+
+  emails_type&
+  emails ()
+  {
+    return emails_;
+  }
+
+  // Employer.
+  //
+  shared_ptr<employer_type>
+  employer () const
+  {
+    return employer_;
+  }
+
+  void
+  employer (shared_ptr<employer_type> employer)
+  {
+    employer_ = employer;
+  }
+
+private:
+  friend class odb::access;
+
+  employee () {}
+
+  #pragma db id auto
+  unsigned long id_;
+
+  std::string first_;
+  std::string last_;
+
+  date born_;
+  emails_type emails_;
+
+  #pragma db not_null
+  shared_ptr<employer_type> employer_;
+};
+
+#endif // EMPLOYEE_HXX