/usr/include/odb/no-op-cache-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_NO_OP_CACHE_TRAITS_HXX
#define ODB_NO_OP_CACHE_TRAITS_HXX
#include <odb/pre.hxx>
#include <odb/traits.hxx>
#include <odb/forward.hxx>
#include <odb/pointer-traits.hxx>
namespace odb
{
// pointer_cache_type
//
// Used to convert an object pointer to the canonical form (non-const),
// suitable for insertion into the cache.
//
template <typename P,
typename E = typename pointer_traits<P>::element_type,
typename O = typename object_traits<E>::object_type,
pointer_kind pk = pointer_traits<P>::kind>
struct pointer_cache_type
{
typedef typename object_traits<O>::pointer_type pointer_type;
static pointer_type
convert (const P& p)
{
return pointer_traits<P>::const_pointer_cast (p);
}
};
template <typename P, typename T, pointer_kind pk>
struct pointer_cache_type<P, T, T, pk>
{
// If element_type and object_type are the same, then it is already
// the canonical pointer.
//
static const P&
convert (const P& p) {return p;}
};
template <typename P, typename E, typename O>
struct pointer_cache_type<P, E, O, pk_unique>
{
// If the pointer is unique, then casting it can transfer ownership.
// In this case we return NULL void*, which will be ignored down the
// chain.
//
static void*
convert (const P&) {return 0;}
};
template <typename P, typename T>
struct pointer_cache_type<P, T, T, pk_unique>
{
static void*
convert (const P&) {return 0;}
};
// reference_cache_type
//
// Used to convert an object reference to the canonical form (non-const),
// suitable for insertion into the cache.
//
template <typename T,
typename O = typename object_traits<T>::object_type>
struct reference_cache_type
{
static O&
convert (T& r)
{
return const_cast<O&> (r);
}
};
template <typename T>
struct reference_cache_type<T, T>
{
// If the types are the same, then it is already the canonical form.
//
static T&
convert (T& r) {return r;}
};
// pointer_cache_traits
//
// Caching traits for objects passed by pointer. P should be the canonical
// pointer (non-const).
//
template <typename P>
struct no_op_pointer_cache_traits
{
typedef P pointer_type;
typedef typename pointer_traits<pointer_type>::element_type object_type;
typedef typename object_traits<object_type>::id_type id_type;
struct position_type {};
struct insert_guard
{
insert_guard () {}
insert_guard (const position_type&) {}
position_type
position () const {return position_type ();}
void
release () {}
void
reset (const position_type&) {}
};
// Cache management.
//
static position_type
insert (odb::database&, const id_type&, const pointer_type&)
{
return position_type ();
}
static position_type
insert (odb::database&, const pointer_type&) {return position_type ();}
// Special signature for unique pointers.
//
static position_type
insert (odb::database&, void*) {return position_type ();}
static pointer_type
find (odb::database&, const id_type&) {return pointer_type ();}
static void
erase (const position_type&) {}
// Notifications.
//
static void
persist (const position_type&) {}
static void
load (const position_type&) {}
static void
update (odb::database&, const object_type&) {}
static void
erase (odb::database&, const id_type&) {}
};
template <typename P>
struct no_id_pointer_cache_traits
{
typedef P pointer_type;
struct position_type {};
static position_type
insert (odb::database&, const pointer_type&) {return position_type ();}
// Special signature for unique pointers.
//
static position_type
insert (odb::database&, void*) {return position_type ();}
static void
persist (const position_type&) {}
static void
load (const position_type&) {}
};
// reference_cache_traits
//
// Caching traits for objects passed by reference. T should be the
// canonical object type (non-const).
//
template <typename T>
struct no_op_reference_cache_traits
{
typedef T object_type;
typedef typename object_traits<object_type>::id_type id_type;
struct position_type {};
struct insert_guard
{
insert_guard () {}
insert_guard (const position_type&) {}
position_type
position () const {return position_type ();}
void
release () {}
void
reset () {}
};
static position_type
insert (odb::database&, const id_type&, object_type&)
{
return position_type ();
}
static position_type
insert (odb::database&, object_type&) {return position_type ();}
static void
persist (const position_type&) {}
static void
load (const position_type&) {}
};
template <typename T>
struct no_id_reference_cache_traits
{
typedef T object_type;
struct position_type {};
static position_type
insert (odb::database&, object_type&) {return position_type ();}
static void
persist (const position_type&) {}
static void
load (const position_type&) {}
};
}
#include <odb/post.hxx>
#endif // ODB_NO_OP_CACHE_TRAITS_HXX
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