| #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 |