/usr/include/odb/session.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_SESSION_HXX
#define ODB_SESSION_HXX
#include <odb/pre.hxx>
#include <map>
#include <typeinfo>
#include <odb/traits.hxx>
#include <odb/forward.hxx>
#include <odb/details/shared-ptr.hxx>
#include <odb/details/type-info.hxx>
#include <odb/details/export.hxx>
namespace odb
{
class LIBODB_EXPORT session
{
public:
typedef odb::database database_type;
// If the make_current argument is true, then set the current thread's
// session to this session. If another session is already in effect,
// throw the already_in_session exception.
//
session (bool make_current = true);
// Reset the current thread's session if it is this session.
//
~session ();
// Current session.
//
public:
// Return true if there is a session in effect in the current
// thread.
//
static bool
has_current () {return current_pointer () != 0;}
// Get current thread's session. Throw if no session is in effect.
//
static session&
current ();
// Set current thread's session.
//
static void
current (session& s) {current_pointer (&s);}
// Revert to the no session in effect state for the current thread.
//
static void
reset_current () {current_pointer (0);}
// Pointer versions.
//
static session*
current_pointer ();
static void
current_pointer (session*);
// Copying or assignment of sessions is not supported.
//
private:
session (const session&);
session& operator= (const session&);
public:
struct LIBODB_EXPORT object_map_base: details::shared_base
{
virtual
~object_map_base ();
};
template <typename T>
struct object_map: object_map_base,
std::map<typename object_traits<T>::id_type,
typename object_traits<T>::pointer_type>
{
};
// Object cache.
//
public:
// Position in the cache of the inserted element.
//
template <typename T>
struct cache_position;
template <typename T>
cache_position<T>
cache_insert (database_type&,
const typename object_traits<T>::id_type&,
const typename object_traits<T>::pointer_type&);
template <typename T>
typename object_traits<T>::pointer_type
cache_find (database_type&,
const typename object_traits<T>::id_type&) const;
template <typename T>
void
cache_erase (const cache_position<T>&);
template <typename T>
void
cache_erase (database_type&, const typename object_traits<T>::id_type&);
// Low-level object cache access (iteration, etc).
//
public:
typedef std::map<const std::type_info*,
details::shared_ptr<object_map_base>,
details::type_info_comparator> type_map;
typedef std::map<database_type*, type_map> database_map;
database_map&
map () {return db_map_;}
const database_map&
map () const {return db_map_;}
// Static cache API as expected by the rest of ODB.
//
public:
// Position in the cache of the inserted element. The requirements
// for this class template are: default and copy-constructible as
// well as copy-assignable. The default constructor creates an
// empty/NULL position.
//
template <typename T>
struct cache_position
{
typedef object_map<T> map;
typedef typename map::iterator iterator;
cache_position (): map_ (0) {}
cache_position (map& m, const iterator& p): map_ (&m), pos_ (p) {}
cache_position&
operator= (const cache_position& p)
{
// It might not be ok to use an uninitialized iterator on the rhs.
//
if (p.map_ != 0)
pos_ = p.pos_;
map_ = p.map_;
return *this;
}
map* map_;
iterator pos_;
};
// The following cache management functions are all static to
// allow for a custom notion of a current session. The erase()
// function is called to remove the object if the operation
// that caused it to be inserted (e.g., load) failed.
//
template <typename T>
static cache_position<T>
_cache_insert (database_type&,
const typename object_traits<T>::id_type&,
const typename object_traits<T>::pointer_type&);
template <typename T>
static typename object_traits<T>::pointer_type
_cache_find (database_type&, const typename object_traits<T>::id_type&);
template <typename T>
static void
_cache_erase (const cache_position<T>&);
// Notifications. These are called after per-object callbacks for
// post_{persist, load, update, erase} events.
//
template <typename T>
static void
_cache_persist (const cache_position<T>&) {}
template <typename T>
static void
_cache_load (const cache_position<T>&) {}
template <typename T>
static void
_cache_update (database_type&, const T&) {}
template <typename T>
static void
_cache_erase (database_type&, const typename object_traits<T>::id_type&);
protected:
database_map db_map_;
};
}
#include <odb/session.ixx>
#include <odb/session.txx>
#include <odb/post.hxx>
#endif // ODB_SESSION_HXX
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