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-ptr-impl.hxx | 149 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 odb/lazy-ptr-impl.hxx

(limited to 'odb/lazy-ptr-impl.hxx')

diff --git a/odb/lazy-ptr-impl.hxx b/odb/lazy-ptr-impl.hxx
new file mode 100644
index 0000000..b480da5
--- /dev/null
+++ b/odb/lazy-ptr-impl.hxx
@@ -0,0 +1,149 @@
+// file      : odb/lazy-ptr-impl.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_PTR_IMPL_HXX
+#define ODB_LAZY_PTR_IMPL_HXX
+
+#include <odb/pre.hxx>
+
+#include <odb/forward.hxx> // odb::database
+#include <odb/traits.hxx>
+
+#include <odb/details/export.hxx>
+
+namespace odb
+{
+  struct LIBODB_EXPORT lazy_ptr_impl_ref
+  {
+    void* id_;
+    database* db_;
+    void (*free_) (void*);
+    void* (*copy_) (const void*);
+  };
+
+  class LIBODB_EXPORT lazy_ptr_base
+  {
+  public:
+    typedef odb::database database_type;
+
+    ~lazy_ptr_base ();
+    lazy_ptr_base ();
+    lazy_ptr_base (const lazy_ptr_base&);
+    lazy_ptr_base (const lazy_ptr_impl_ref&);
+
+    lazy_ptr_base&
+    operator= (const lazy_ptr_base&);
+
+    lazy_ptr_base&
+    operator= (const lazy_ptr_impl_ref&);
+
+    // Reset both the id and database.
+    //
+    void
+    reset ();
+
+    // Reset the id and set the database to the new value.
+    //
+    void
+    reset (database_type&);
+
+    // Reset the id.
+    //
+    void
+    reset_id ();
+
+    void
+    swap (lazy_ptr_base&);
+
+    database_type*
+    database () const;
+
+    typedef void* lazy_ptr_base::*unspecified_bool_type;
+    operator unspecified_bool_type () const
+    {
+      return id_ != 0 ? &lazy_ptr_base::id_ : 0;
+    }
+
+    operator lazy_ptr_impl_ref ();
+
+  protected:
+    typedef void (*free_func) (void*);
+    typedef void* (*copy_func) (const void*);
+
+    // Makes a copy of id.
+    //
+    void
+    reset_ (database_type*, const void* id, free_func, copy_func);
+
+    template <typename T>
+    static void
+    free (void*);
+
+    template <typename T>
+    static void*
+    copy (const void*);
+
+  protected:
+    void* id_;
+    database_type* db_;
+
+  private:
+    free_func free_;
+    copy_func copy_;
+  };
+
+  template <typename T>
+  class lazy_ptr_impl: public lazy_ptr_base
+  {
+  public:
+    lazy_ptr_impl ();
+
+    template <typename ID>
+    lazy_ptr_impl (database_type&, const ID&);
+
+    lazy_ptr_impl (const lazy_ptr_impl&);
+
+    template <typename Y>
+    lazy_ptr_impl (const lazy_ptr_impl<Y>&);
+
+    lazy_ptr_impl (const lazy_ptr_impl_ref&);
+
+    lazy_ptr_impl&
+    operator= (const lazy_ptr_impl&);
+
+    template <typename Y>
+    lazy_ptr_impl&
+    operator= (const lazy_ptr_impl<Y>&);
+
+    lazy_ptr_impl&
+    operator= (const lazy_ptr_impl_ref&);
+
+    using lazy_ptr_base::reset;
+    using lazy_ptr_base::reset_id;
+
+    template <typename ID>
+    void
+    reset (database_type&, const ID&);
+
+    template <typename ID>
+    void
+    reset_id (const ID&);
+
+    template <typename O /* = T */>
+    typename object_traits<O>::pointer_type
+    load (bool reset_id);
+
+    template <typename O /* = T */>
+    typename object_traits<O>::id_type
+    object_id () const;
+  };
+}
+
+#include <odb/lazy-ptr-impl.ixx>
+#include <odb/lazy-ptr-impl.txx>
+
+#include <odb/post.hxx>
+
+#endif // ODB_LAZY_PTR_IMPL_HXX
-- 
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