From cd09ab74e179fd4c42ad226fd5cc609485a8df01 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 22 Nov 2010 12:01:11 +0200
Subject: Add pointer kind and const_pointer to pointer traits

---
 odb/pointer-traits.hxx     | 14 ++++++++++++++
 odb/tr1-pointer-traits.hxx |  7 +++++++
 2 files changed, 21 insertions(+)

diff --git a/odb/pointer-traits.hxx b/odb/pointer-traits.hxx
index 34ec7cd..cd25820 100644
--- a/odb/pointer-traits.hxx
+++ b/odb/pointer-traits.hxx
@@ -14,6 +14,14 @@
 
 namespace odb
 {
+  enum pointer_kind
+  {
+    pk_naked,  // Naked or equivalent (i.e., unmanaged).
+    pk_unique, // Smart pointer that doesn't support sharing.
+    pk_shared, // Smart pointer that support sharing.
+    pk_weak    // Weak counterpart for shared pointer.
+  };
+
   template <typename P>
   class pointer_traits;
 
@@ -67,8 +75,11 @@ namespace odb
   class pointer_traits<T*>
   {
   public:
+    static pointer_kind const kind = pk_naked;
+
     typedef T element_type;
     typedef T* pointer_type;
+    typedef const T* const_pointer_type;
     typedef naked_ptr_guard<pointer_type> guard_type;
 
     // Return naked pointer to the pointed-to element, including NULL.
@@ -124,8 +135,11 @@ namespace odb
   class pointer_traits< std::auto_ptr<T> >
   {
   public:
+    static pointer_kind const kind = pk_unique;
+
     typedef T element_type;
     typedef std::auto_ptr<element_type> pointer_type;
+    typedef std::auto_ptr<const element_type> const_pointer_type;
     typedef smart_ptr_guard<pointer_type> guard_type;
 
     static element_type*
diff --git a/odb/tr1-pointer-traits.hxx b/odb/tr1-pointer-traits.hxx
index edb5ce8..121a564 100644
--- a/odb/tr1-pointer-traits.hxx
+++ b/odb/tr1-pointer-traits.hxx
@@ -21,8 +21,11 @@ namespace odb
   class pointer_traits< std::tr1::shared_ptr<T> >
   {
   public:
+    static pointer_kind const kind = pk_shared;
+
     typedef T element_type;
     typedef std::tr1::shared_ptr<element_type> pointer_type;
+    typedef std::tr1::shared_ptr<const element_type> const_pointer_type;
     typedef smart_ptr_guard<pointer_type> guard_type;
 
     static element_type*
@@ -63,9 +66,13 @@ namespace odb
   class pointer_traits< std::tr1::weak_ptr<T> >
   {
   public:
+    static pointer_kind const kind = pk_weak;
+
     typedef T element_type;
     typedef std::tr1::weak_ptr<element_type> pointer_type;
+    typedef std::tr1::weak_ptr<const element_type> const_pointer_type;
     typedef std::tr1::shared_ptr<element_type> strong_pointer_type;
+    typedef std::tr1::shared_ptr<const element_type> strong_const_pointer_type;
   };
 }
 
-- 
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