From eaf07e23f93813fa2c2e6b4d67e69fc6f4c48673 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 28 Feb 2012 12:42:00 +0200
Subject: Support for C++11 std::shared_ptr/weak_ptr as object pointers

This includes odb::lazy_shared_ptr and odb::lazy_weak_ptr implementations.
---
 odb/lazy-ptr.txx | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

(limited to 'odb/lazy-ptr.txx')

diff --git a/odb/lazy-ptr.txx b/odb/lazy-ptr.txx
index 4bb511c..2265fec 100644
--- a/odb/lazy-ptr.txx
+++ b/odb/lazy-ptr.txx
@@ -38,4 +38,70 @@ namespace odb
     return i_.database () == r.i_.database () &&
       object_id<object_type1> () == r.object_id<object_type2> ();
   }
+
+#ifdef ODB_CXX11
+
+  //
+  // lazy_shared_ptr
+  //
+
+  template <class T>
+  template <class Y>
+  bool lazy_shared_ptr<T>::
+  equal (const lazy_shared_ptr<Y>& r) const
+  {
+    bool t1 (!p_ == loaded ());
+    bool t2 (!r.p_ == r.loaded ());
+
+    // If both are transient, then compare the underlying pointers.
+    //
+    if (t1 && t2)
+      return p_ == r.p_;
+
+    // If one is transient and the other is persistent, then compare
+    // the underlying pointers but only if they are non NULL. Note
+    // that an unloaded persistent object is always unequal to a
+    // transient object.
+    //
+    if (t1 || t2)
+      return p_ == r.p_ && p_;
+
+    // If both objects are persistent, then we compare databases and
+    // object ids.
+    //
+    typedef typename object_traits<T>::object_type object_type1;
+    typedef typename object_traits<Y>::object_type object_type2;
+
+    return i_.database () == r.i_.database () &&
+      object_id<object_type1> () == r.object_id<object_type2> ();
+  }
+
+  //
+  // lazy_weak_ptr
+  //
+
+  template <class T>
+  lazy_shared_ptr<T> lazy_weak_ptr<T>::
+  lock () const
+  {
+    std::shared_ptr<T> sp (p_.lock ());
+
+    if (sp)
+    {
+      if (database_type* db = i_.database ())
+        return lazy_shared_ptr<T> (*db, sp);
+      else
+        return lazy_shared_ptr<T> (sp);
+    }
+    else
+    {
+      if (i_)
+        return lazy_shared_ptr<T> (*i_.database (), i_.object_id<T> ());
+      else
+        return lazy_shared_ptr<T> ();
+    }
+  }
+
+#endif // ODB_CXX11
+
 }
-- 
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