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#ifndef PTR_DWA20020601_HPP
# define PTR_DWA20020601_HPP
# include <boost/python/detail/prefix.hpp>
// Copyright David Abrahams 2002.
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Based on boost/ref.hpp, thus:
// Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
// Copyright (C) 2001 Peter Dimov
# if _MSC_VER+0 >= 1020
# pragma once
# endif
# include <boost/config.hpp>
# include <boost/mpl/bool.hpp>
namespace boost { namespace python {
template<class Ptr> class pointer_wrapper
{
public:
typedef Ptr type;
explicit pointer_wrapper(Ptr x): p_(x) {}
operator Ptr() const { return p_; }
Ptr get() const { return p_; }
private:
Ptr p_;
};
template<class T>
inline pointer_wrapper<T> ptr(T t)
{
return pointer_wrapper<T>(t);
}
# ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template<typename T>
class is_pointer_wrapper
: public mpl::false_
{
};
template<typename T>
class is_pointer_wrapper<pointer_wrapper<T> >
: public mpl::true_
{
};
template<typename T>
class unwrap_pointer
{
public:
typedef T type;
};
template<typename T>
class unwrap_pointer<pointer_wrapper<T> >
{
public:
typedef T type;
};
# else // no partial specialization
}} // namespace boost::python
#include <boost/type.hpp>
namespace boost { namespace python {
namespace detail
{
typedef char (&yes_pointer_wrapper_t)[1];
typedef char (&no_pointer_wrapper_t)[2];
no_pointer_wrapper_t is_pointer_wrapper_test(...);
template<typename T>
yes_pointer_wrapper_t is_pointer_wrapper_test(boost::type< pointer_wrapper<T> >);
template<bool wrapped>
struct pointer_unwrapper
{
template <class T>
struct apply
{
typedef T type;
};
};
template<>
struct pointer_unwrapper<true>
{
template <class T>
struct apply
{
typedef typename T::type type;
};
};
}
template<typename T>
class is_pointer_wrapper
{
public:
BOOST_STATIC_CONSTANT(
bool, value = (
sizeof(detail::is_pointer_wrapper_test(boost::type<T>()))
== sizeof(detail::yes_pointer_wrapper_t)));
typedef mpl::bool_<value> type;
};
template <typename T>
class unwrap_pointer
: public detail::pointer_unwrapper<
is_pointer_wrapper<T>::value
>::template apply<T>
{};
# endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
}} // namespace boost::python
#endif // #ifndef PTR_DWA20020601_HPP
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