aboutsummaryrefslogtreecommitdiff
path: root/odb/lazy-ptr-impl.txx
blob: 9163c336f688bc24001514617fd456a88ff78fe6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
// file      : odb/lazy-ptr-impl.txx
// copyright : Copyright (c) 2009-2015 Code Synthesis Tools CC
// license   : GNU GPL v2; see accompanying LICENSE file

#include <odb/database.hxx>

namespace odb
{
  //
  // lazy_ptr_base
  //

  template <typename T>
  void lazy_ptr_base::
  free (void* p)
  {
    delete static_cast<T*> (p);
  }

  template <typename T>
  void* lazy_ptr_base::
  copy (const void* p)
  {
    return new T (*static_cast<const T*> (p));
  }

  template <typename T, typename DB>
  typename object_traits<T>::pointer_type lazy_ptr_base::
  loader (database_type& db, const typename object_traits<T>::id_type& id)
  {
    return static_cast<DB&> (db).template load<T> (id);
  }

  //
  // lazy_ptr_impl
  //

  template <typename T>
  template <typename O>
  inline typename object_traits<O>::pointer_type lazy_ptr_impl<T>::
  load (bool reset)
  {
    typedef typename object_traits<T>::id_type id_type;
    typedef typename object_traits<T>::pointer_type pointer_type;
    typedef pointer_type (*loader_type) (database_type&, const id_type&);

    loader_type loader (reinterpret_cast<loader_type> (loader_));
    const id_type& id (*static_cast<const id_type*> (id_));
    pointer_type p (loader (*db_, id));

    if (reset)
      reset_id ();

    // If you get a compile error pointing here, then you most likely
    // used a wrong type as a template argument in the load() call.
    //
    return p;
  }
}