Chris@16: /*=============================================================================
Chris@16:     Copyright (c) 2006-2007 Tobias Schwinger
Chris@16:   
Chris@16:     Use modification and distribution are subject to the Boost Software 
Chris@16:     License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16:     http://www.boost.org/LICENSE_1_0.txt).
Chris@16: ==============================================================================*/
Chris@16: 
Chris@16: #if !defined(BOOST_FUSION_FUNCTIONAL_INVOCATION_DETAIL_THAT_PTR_HPP_INCLUDED)
Chris@16: #define BOOST_FUSION_FUNCTIONAL_INVOCATION_DETAIL_THAT_PTR_HPP_INCLUDED
Chris@16: 
Chris@101: #include <boost/fusion/support/config.hpp>
Chris@16: #include <boost/get_pointer.hpp>
Chris@16: #include <boost/utility/addressof.hpp>
Chris@16: #include <boost/type_traits/config.hpp>
Chris@16: #include <boost/type_traits/remove_reference.hpp>
Chris@16: 
Chris@16: namespace boost { namespace fusion { namespace detail
Chris@16: {
Chris@16:     template <typename Wanted>
Chris@16:     struct that_ptr
Chris@16:     {
Chris@16:       private:
Chris@16: 
Chris@16:         typedef typename remove_reference<Wanted>::type pointee;
Chris@16: 
Chris@16:         template <typename T> 
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         static inline pointee * do_get_pointer(T &, pointee * x) 
Chris@16:         {
Chris@16:             return x;
Chris@16:         }
Chris@16:         template <typename T> 
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         static inline pointee * do_get_pointer(T & x, void const *) 
Chris@16:         {
Chris@16:             return get_pointer(x); 
Chris@16:         }
Chris@16: 
Chris@16:       public:
Chris@16: 
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         static inline pointee * get(pointee * x)
Chris@16:         {
Chris@16:             return x; 
Chris@16:         }
Chris@16: 
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@16:         static inline pointee * get(pointee & x)
Chris@16:         {
Chris@16:             return boost::addressof(x); 
Chris@16:         }
Chris@16: 
Chris@101:         template <typename T>
Chris@101:         BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
Chris@101:         static inline pointee * get(T & x)
Chris@16:         {
Chris@16:             return do_get_pointer(x, boost::addressof(x)); 
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     template <typename PtrOrSmartPtr> struct non_const_pointee;
Chris@16: 
Chris@16:     namespace adl_barrier
Chris@16:     {
Chris@16:         using boost::get_pointer;
Chris@16:         void const * BOOST_TT_DECL get_pointer(...); // fallback
Chris@16:   
Chris@16:         template< typename T> char const_tester(T *);
Chris@16:         template< typename T> long const_tester(T const *);
Chris@16: 
Chris@16:         template <typename Ptr>
Chris@16:         struct non_const_pointee_impl
Chris@16:         {
Chris@16:             static Ptr & what;
Chris@16: 
Chris@16:             static bool const value =
Chris@16:                 sizeof(const_tester(get_pointer(what))) == 1;
Chris@16:         };
Chris@16:     }
Chris@16: 
Chris@16:     template <typename PtrOrSmartPtr> struct non_const_pointee
Chris@16:         : adl_barrier::non_const_pointee_impl< 
Chris@16:               typename remove_cv<
Chris@16:                   typename remove_reference<PtrOrSmartPtr>::type >::type >
Chris@16:     {
Chris@16:         typedef non_const_pointee type;
Chris@16:         typedef bool value_type;
Chris@16:     };
Chris@16: 
Chris@16: }}}
Chris@16: 
Chris@16: #endif
Chris@16: