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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/pre.hxx>
#include <odb/forward.hxx>
#include <odb/pointer-traits.hxx>
namespace odb
{
// template <typename T>
// class access::object_traits;
//
// Specializations should define the following members:
//
// id_type - object id (primary key) type
// id_type id (const T&) - get object id
//
// void persist (database&, T&)
// void update (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, typename P>
class access::object_factory
{
public:
typedef T object_type;
typedef P pointer_type;
static P
create ()
{
// By default use pointer-specific construction.
//
return pointer_factory<T, P>::create ();
}
};
template <typename T, typename P>
class access::pointer_factory
{
public:
typedef T object_type;
typedef P pointer_type;
static P
create ()
{
void* v (pointer_traits<P>::allocate (sizeof (T)));
mem_guard g (v);
P p (new (v) T);
g.release ();
return p;
}
private:
struct mem_guard
{
mem_guard (void* p): p_ (p) {}
~mem_guard () {if (p_) pointer_traits<P>::free (p_);}
void release () {p_ = 0;}
void* p_;
};
};
template <typename T>
struct object_traits: access::object_traits<T>,
access::object_factory<T, typename access::object_traits<T>::pointer_type>
{
typedef typename access::object_traits<T>::object_type object_type;
typedef typename access::object_traits<T>::pointer_type pointer_type;
typedef
odb::pointer_traits<typename access::object_traits<T>::pointer_type>
pointer_traits;
};
template <typename T>
struct composite_value_traits: access::composite_value_traits<T>
{
};
}
#include <odb/post.hxx>
#endif // ODB_TRAITS_HXX
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