Add lazy pointer support

Built-in support is provided for raw, auto, and tr1 shared/weak pointers.
New test: common/lazy-ptr.

1 files changed, 30 insertions, 0 deletions

diff --git a/odb/lazy-ptr.txx b/odb/lazy-ptr.txx
new file mode 100644
index 0000000..c016588
--- /dev/null
+++ b/odb/lazy-ptr.txx
@@ -0,0 +1,30 @@
+// file      : odb/lazy-ptr.txx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+namespace odb
+{
+  //
+  // lazy_ptr
+  //
+
+  template <class T>
+  template <class Y>
+  bool lazy_ptr<T>::
+  equal (const lazy_ptr<Y>& r) const
+  {
+    if (loaded () && r.loaded ())
+      return p_ == r.p_;
+
+    // If one of the object is not loaded, then we compare databases and
+    // object ids. Note that NULL pointers cannot have non-NULL databases
+    // and if both of them are NULL, we wouldn't have gotten here.
+    //
+    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> ();
+  }
+}