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// file : odb/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_TRAITS_HXX
#define ODB_TRAITS_HXX
#include <odb/forward.hxx>
#include <odb/buffer.hxx>
#include <odb/shared-ptr.hxx>
#include <odb/pointer-traits.hxx>
namespace odb
{
enum id_source
{
ids_assigned /* Assigned by the application. */
};
// template <typename T>
// class access::object_traits;
//
// Specializations should inherit from object_memory, object_factory
// and define the following members:
//
// id_type - object id (primary key) type
// id_source - object id (primary key) source
// id_type id (const T&) - get object id
//
// void persist (database&, T&)
// void store (database&, T&)
// void erase (database&, const id_type&)
// pointer_type find (database&, const id_type&)
// bool find (database&, const id_type&, T&)
//
//
template <typename T>
class access::object_memory
{
public:
typedef T* pointer_type;
};
template <typename T>
class access::object_factory
{
public:
static typename object_memory<T>::pointer_type
create ()
{
// By default use pointer-specific construction.
//
return
pointer_factory<typename object_memory<T>::pointer_type>::create ();
}
};
template <typename P>
class access::pointer_factory
{
public:
typedef typename pointer_traits<P>::type object_type;
static P
create ()
{
void* v (pointer_traits<P>::allocate (sizeof (object_type)));
guard g (v);
P p (new (v) object_type);
g.release ();
return p;
}
private:
struct guard
{
guard (void* p): p_ (p) {}
~guard () {if (p_) pointer_traits<P>::free (p_);}
void release () {p_ = 0;}
void* p_;
};
};
template <typename T>
struct object_traits: access::object_traits<T>
{
typedef
pointer_traits<typename access::object_traits<T>::pointer_type>
pointer_ops;
};
template <typename V>
class value_traits
{
public:
typedef V value_type;
template <typename I>
static void
set_value (value_type& v, I i, bool is_null)
{
if (!is_null)
v = value_type (i);
else
v = value_type ();
}
template <typename I>
static void
set_image (I& i, bool& is_null, value_type v)
{
is_null = false;
i = I (v);
}
};
}
#endif // ODB_TRAITS_HXX
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