From ec355c48c49074bebeb597f6e5dcedfeb9d52fae Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 9 Dec 2010 10:36:15 +0200
Subject: Add lazy pointer support

Built-in support is provided for raw, auto, and tr1 shared/weak pointers.
New test: common/lazy-ptr.
---
 odb/lazy-pointer-traits.hxx | 69 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 odb/lazy-pointer-traits.hxx

(limited to 'odb/lazy-pointer-traits.hxx')

diff --git a/odb/lazy-pointer-traits.hxx b/odb/lazy-pointer-traits.hxx
new file mode 100644
index 0000000..599b051
--- /dev/null
+++ b/odb/lazy-pointer-traits.hxx
@@ -0,0 +1,69 @@
+// file      : odb/lazy-pointer-traits.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_LAZY_POINTER_TRAITS_HXX
+#define ODB_LAZY_POINTER_TRAITS_HXX
+
+#include <odb/pre.hxx>
+
+#include <odb/pointer-traits.hxx>
+#include <odb/lazy-ptr.hxx>
+
+namespace odb
+{
+  template <typename T>
+  class pointer_traits< lazy_ptr<T> >
+  {
+  public:
+    static pointer_kind const kind = pk_naked;
+    static bool const lazy = true;
+
+    typedef T element_type;
+    typedef lazy_ptr<element_type> pointer_type;
+    typedef element_type* eager_pointer_type;
+
+    static bool
+    null_ptr (const pointer_type& p)
+    {
+      return !p;
+    }
+
+    template <class O /* = T */>
+    static typename object_traits<O>::id_type
+    object_id (const pointer_type& p)
+    {
+      return p.object_id<O> ();
+    }
+  };
+
+  template <typename T>
+  class pointer_traits< lazy_auto_ptr<T> >
+  {
+  public:
+    static pointer_kind const kind = pk_unique;
+    static bool const lazy = true;
+
+    typedef T element_type;
+    typedef lazy_auto_ptr<element_type> pointer_type;
+    typedef std::auto_ptr<element_type> eager_pointer_type;
+
+    static bool
+    null_ptr (const pointer_type& p)
+    {
+      return !p;
+    }
+
+    template <class O /* = T */>
+    static typename object_traits<O>::id_type
+    object_id (const pointer_type& p)
+    {
+      return p.object_id<O> ();
+    }
+  };
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_LAZY_POINTER_TRAITS_HXX
-- 
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