/usr/include/odb/traits.hxx is in libodb-dev 2.4.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// copyright : Copyright (c) 2009-2015 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
{
// Fallback dummy for non-persistent classes. It is necessary to allow
// the C++ compiler to instantiate persist(), etc., signatures in class
// database when T is a pointer (raw, smart). The overloads that use
// these dummy would never actually be selected by the compiler.
//
template <typename T>
class access::object_traits
{
// If a C++ compiler issues an error pointing to this class and saying
// that it is missing some declaration, then you are most likely trying
// to perform a database operation on a C++ type that is not a persistent
// object. Or you forgot to include the corresponding -odb.hxx file.
//
public:
struct id_type {};
typedef T object_type;
typedef T* pointer_type;
static const bool polymorphic = false;
};
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::view_factory
{
public:
typedef T view_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 value_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_;
};
};
//
// class_traits
//
enum class_kind
{
class_object,
class_view,
class_other
};
template <typename T>
struct class_traits
{
static const class_kind kind = class_other;
};
template <typename T>
struct class_traits<const T>
{
static const class_kind kind = class_traits<T>::kind;
};
//
// object_traits
//
template <typename T>
//
// If a C++ compiler issues an error pointing to this struct and
// saying that it is incomplete, then you are most likely trying to
// perform a database operation on a C++ type that is not a persistent
// object. Or you forgot to include the corresponding -odb.hxx file.
//
struct object_traits:
access::object_traits<T>,
access::object_factory<T, typename access::object_traits<T>::pointer_type>
{
typedef
odb::pointer_traits<typename access::object_traits<T>::pointer_type>
pointer_traits;
typedef typename access::object_traits<T>::object_type object_type;
typedef typename access::object_traits<T>::pointer_type pointer_type;
typedef typename pointer_traits::const_pointer_type const_pointer_type;
};
// Specialization for const objects. It only defines the id, object,
// pointer, and const_pointer types with pointer and const_pointer
// being the same. The idea is to only use this specialization in the
// interfaces, with the implementations detecting this situation and
// using the non-const object_traits version.
//
template <typename T>
struct object_traits<const T>
{
private:
typedef
odb::pointer_traits<typename access::object_traits<T>::pointer_type>
pointer_traits;
public:
typedef typename access::object_traits<T>::id_type id_type;
typedef typename access::object_traits<T>::object_type object_type;
typedef typename pointer_traits::const_pointer_type const_pointer_type;
typedef const_pointer_type pointer_type;
static const bool polymorphic = access::object_traits<T>::polymorphic;
};
// Specialization for section to allow instantiation of all the load()
// signature.
//
template <>
struct object_traits<section> {};
template <typename T, database_id DB>
//
// If a C++ compiler issues an error pointing to this struct and
// saying that it is incomplete, then you are most likely trying to
// perform a database operation on a C++ type that is not a persistent
// object. Or you forgot to include the corresponding -odb.hxx file.
//
struct object_traits_impl:
access::object_traits_impl<T, DB>,
access::object_factory<T, typename access::object_traits<T>::pointer_type>
{
typedef
odb::pointer_traits<typename access::object_traits<T>::pointer_type>
pointer_traits;
typedef typename access::object_traits<T>::object_type object_type;
typedef typename access::object_traits<T>::pointer_type pointer_type;
typedef typename pointer_traits::const_pointer_type const_pointer_type;
};
//
// view_traits
//
template <typename T>
//
// If a C++ compiler issues an error pointing to this struct and
// saying that it is incomplete, then you are most likely trying to
// perform a database operation on a C++ type that is not a view
// Or you forgot to include the corresponding -odb.hxx file.
//
struct view_traits:
access::view_traits<T>,
access::view_factory<T, typename access::view_traits<T>::pointer_type>
{
typedef
odb::pointer_traits<typename access::view_traits<T>::pointer_type>
pointer_traits;
typedef typename access::view_traits<T>::view_type view_type;
typedef typename access::view_traits<T>::pointer_type pointer_type;
};
// Specialization for const views. It only defines the view, pointer,
// and const_pointer types with pointer and const_pointer being the
// same. Similar to objects, the idea is to only use this specialization
// in the interfaces, with the implementations detecting this situation
// and using the non-const view_traits version.
//
template <typename T>
struct view_traits<const T>
{
private:
typedef
odb::pointer_traits<typename access::view_traits<T>::pointer_type>
pointer_traits;
public:
typedef typename access::view_traits<T>::view_type view_type;
typedef typename pointer_traits::const_pointer_type const_pointer_type;
typedef const_pointer_type pointer_type;
};
template <typename T, database_id DB>
//
// If a C++ compiler issues an error pointing to this struct and
// saying that it is incomplete, then you are most likely trying to
// perform a database operation on a C++ type that is not a view
// Or you forgot to include the corresponding -odb.hxx file.
//
struct view_traits_impl:
access::view_traits_impl<T, DB>,
access::view_factory<T, typename access::view_traits<T>::pointer_type>
{
typedef
odb::pointer_traits<typename access::view_traits<T>::pointer_type>
pointer_traits;
typedef typename access::view_traits<T>::view_type view_type;
typedef typename access::view_traits<T>::pointer_type pointer_type;
};
//
// composite_value_traits
//
template <typename T, database_id DB>
struct composite_value_traits: access::composite_value_traits<T, DB>
{
};
//
// Get root image from a polymorphic image chain.
//
template <typename T, std::size_t d>
struct root_image_impl
{
typedef root_image_impl<typename T::base_traits, d - 1> base_type;
typedef typename base_type::image_type image_type;
static image_type&
get (typename T::image_type& i) {return base_type::get (*i.base);}
};
template <typename T>
struct root_image_impl<T, 1>
{
typedef typename T::image_type image_type;
static image_type&
get (image_type& i) {return i;}
};
template <typename T, bool p>
struct root_image
{
typedef root_image_impl<T, T::depth> impl_type;
typedef typename impl_type::image_type image_type;
static image_type&
get (typename T::image_type& i) {return impl_type::get (i);}
};
template <typename T>
struct root_image<T, false>
{
typedef typename T::image_type image_type;
static image_type&
get (image_type& i) {return i;}
};
}
#include <odb/post.hxx>
#endif // ODB_TRAITS_HXX
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