/usr/include/odb/wrapper-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_WRAPPER_TRAITS_HXX
#define ODB_WRAPPER_TRAITS_HXX
#include <odb/pre.hxx>
#include <memory> // std::auto_ptr, std::unique_ptr, std::shared_ptr/weak_ptr
#include <odb/nullable.hxx>
#include <odb/details/config.hxx> // ODB_CXX11
#include <odb/details/meta/remove-const.hxx>
namespace odb
{
template <typename T>
class wrapper_traits;
// Sample specialization for raw pointers. It is not enabled by default
// since it makes many assumptions that may not always hold true (such
// as that instances are allocated with new and freed with delete).
// This makes it too dangerous to be enabled unconditionally. If you
// need this functionality, you can copy the below code into your
// application. Also consider changing it to only specialize for
// specific types instead of for any pointer (it will almost always
// do the wrong thing for char*).
//
#if 0
template <typename T>
class wrapper_traits<T*>
{
public:
typedef T wrapped_type;
typedef T* wrapper_type;
// T can be const.
//
typedef
typename details::meta::remove_const<T>::result
unrestricted_wrapped_type;
static const bool null_handler = true;
static const bool null_default = false;
static bool
get_null (const wrapper_type& p)
{
return p == 0;
}
static void
set_null (wrapper_type& p)
{
delete p;
p = 0;
}
static const wrapped_type&
get_ref (const wrapper_type& p)
{
return *p;
}
static unrestricted_wrapped_type&
set_ref (wrapper_type& p)
{
if (p == 0)
p = new unrestricted_wrapped_type;
return const_cast<unrestricted_wrapped_type&> (*p);
}
};
#endif
// Specialization for std::auto_ptr.
//
template <typename T>
class wrapper_traits< std::auto_ptr<T> >
{
public:
// T can be const.
//
typedef T wrapped_type;
typedef std::auto_ptr<T> wrapper_type;
// T can be const.
//
typedef
typename odb::details::meta::remove_const<T>::result
unrestricted_wrapped_type;
static const bool null_handler = true;
static const bool null_default = false;
static bool
get_null (const wrapper_type& p)
{
return p.get () == 0;
}
static void
set_null (wrapper_type& p)
{
p.reset ();
}
static const wrapped_type&
get_ref (const wrapper_type& p)
{
return *p;
}
static unrestricted_wrapped_type&
set_ref (wrapper_type& p)
{
if (p.get () == 0)
p.reset (new unrestricted_wrapped_type ());
return const_cast<unrestricted_wrapped_type&> (*p);
}
};
#ifdef ODB_CXX11
// Specialization for C++11 std::unique_ptr.
//
template <typename T, typename D>
class wrapper_traits<std::unique_ptr<T, D>>
{
public:
// T can be const.
//
typedef T wrapped_type;
typedef std::unique_ptr<T, D> wrapper_type;
// T can be const.
//
typedef
typename odb::details::meta::remove_const<T>::result
unrestricted_wrapped_type;
static const bool null_handler = true;
static const bool null_default = false;
static bool
get_null (const wrapper_type& p)
{
return !p;
}
static void
set_null (wrapper_type& p)
{
p.reset ();
}
static const wrapped_type&
get_ref (const wrapper_type& p)
{
return *p;
}
static unrestricted_wrapped_type&
set_ref (wrapper_type& p)
{
if (!p)
p.reset (new unrestricted_wrapped_type ());
return const_cast<unrestricted_wrapped_type&> (*p);
}
};
// Specialization for C++11 std::shared_ptr.
//
template <typename T>
class wrapper_traits<std::shared_ptr<T>>
{
public:
typedef T wrapped_type;
typedef std::shared_ptr<T> wrapper_type;
// T can be const.
//
typedef
typename odb::details::meta::remove_const<T>::result
unrestricted_wrapped_type;
static const bool null_handler = true;
static const bool null_default = false;
static bool
get_null (const wrapper_type& p)
{
return !p;
}
static void
set_null (wrapper_type& p)
{
p.reset ();
}
static const wrapped_type&
get_ref (const wrapper_type& p)
{
return *p;
}
static unrestricted_wrapped_type&
set_ref (wrapper_type& p)
{
if (!p)
p.reset (new unrestricted_wrapped_type);
return const_cast<unrestricted_wrapped_type&> (*p);
}
};
#endif // ODB_CXX11
// Specialization for odb::nullable.
//
template <typename T>
class wrapper_traits< nullable<T> >
{
public:
// T can be const.
//
typedef T wrapped_type;
typedef nullable<T> wrapper_type;
// T can be const.
//
typedef
typename odb::details::meta::remove_const<T>::result
unrestricted_wrapped_type;
static const bool null_handler = true;
static const bool null_default = true;
static bool
get_null (const wrapper_type& n)
{
return n.null ();
}
static void
set_null (wrapper_type& n)
{
n.reset ();
}
static const wrapped_type&
get_ref (const wrapper_type& n)
{
return *n;
}
static unrestricted_wrapped_type&
set_ref (wrapper_type& n)
{
if (n.null ())
n = unrestricted_wrapped_type ();
return const_cast<unrestricted_wrapped_type&> (*n);
}
};
}
#include <odb/post.hxx>
#endif // ODB_WRAPPER_TRAITS_HXX
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