

//  (C) Copyright Dave Abrahams, Steve Cleary, Beman Dawes, 

//      Howard Hinnant and John Maddock 2000. 

//  (C) Copyright Mat Marcus, Jesse Jones and Adobe Systems Inc 2001



//  Use, modification and distribution are subject to 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).

//

//  See http://www.boost.org/libs/type_traits for most recent version including documentation.



//    Fixed is_pointer, is_reference, is_const, is_volatile, is_same, 

//    is_member_pointer based on the Simulated Partial Specialization work 

//    of Mat Marcus and Jesse Jones. See  http://opensource.adobe.com or 

//    http://groups.yahoo.com/group/boost/message/5441 

//    Some workarounds in here use ideas suggested from "Generic<Programming>: 

//    Mappings between Types and Values" 

//    by Andrei Alexandrescu (see http://www.cuj.com/experts/1810/alexandr.html).





#ifndef BOOST_TT_IS_POINTER_HPP_INCLUDED

#define BOOST_TT_IS_POINTER_HPP_INCLUDED



#include <boost/type_traits/is_member_pointer.hpp>

#include <boost/type_traits/detail/ice_and.hpp>

#include <boost/type_traits/detail/ice_not.hpp>

#include <boost/type_traits/config.hpp>

#if !BOOST_WORKAROUND(BOOST_MSVC,<=1300)

#include <boost/type_traits/remove_cv.hpp>

#endif



#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

#   include <boost/type_traits/is_reference.hpp>

#   include <boost/type_traits/is_array.hpp>

#   include <boost/type_traits/detail/is_function_ptr_tester.hpp>

#   include <boost/type_traits/detail/false_result.hpp>

#   include <boost/type_traits/detail/ice_or.hpp>

#endif



// should be the last #include

#include <boost/type_traits/detail/bool_trait_def.hpp>



namespace boost {



#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION



namespace detail {



template< typename T > struct is_pointer_helper

{

    BOOST_STATIC_CONSTANT(bool, value = false);

};



#   define TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(helper,sp,result) \

template< typename T > struct helper<sp> \

{ \

    BOOST_STATIC_CONSTANT(bool, value = result); \

}; \

/**/



TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC(is_pointer_helper,T*,true)



#   undef TT_AUX_BOOL_TRAIT_HELPER_PARTIAL_SPEC



template< typename T >

struct is_pointer_impl

{

#if BOOST_WORKAROUND(BOOST_MSVC,<=1300)

    BOOST_STATIC_CONSTANT(bool, value =

        (::boost::type_traits::ice_and<

              ::boost::detail::is_pointer_helper<T>::value

            , ::boost::type_traits::ice_not<

                ::boost::is_member_pointer<T>::value

                >::value

            >::value)

        );

#else

    BOOST_STATIC_CONSTANT(bool, value =

        (::boost::type_traits::ice_and<

        ::boost::detail::is_pointer_helper<typename remove_cv<T>::type>::value

            , ::boost::type_traits::ice_not<

                ::boost::is_member_pointer<T>::value

                >::value

            >::value)

        );

#endif

};



} // namespace detail



BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,::boost::detail::is_pointer_impl<T>::value)



#if defined(__BORLANDC__) && !defined(__COMO__) && (__BORLANDC__ < 0x600)

BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T&,false)

BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& const,false)

BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& volatile,false)

BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_pointer,T& const volatile,false)

#endif



#else // no partial template specialization



namespace detail {



struct pointer_helper

{

    pointer_helper(const volatile void*);

};



yes_type BOOST_TT_DECL is_pointer_tester(pointer_helper);

no_type BOOST_TT_DECL is_pointer_tester(...);



template <bool>

struct is_pointer_select

    : ::boost::type_traits::false_result

{

};



template <>

struct is_pointer_select<false>

{

    template <typename T> struct result_

    {

        static T& make_t();

        BOOST_STATIC_CONSTANT(bool, value =

                (::boost::type_traits::ice_or<

                    (1 == sizeof(is_pointer_tester(make_t()))),

                    (1 == sizeof(type_traits::is_function_ptr_tester(make_t())))

                >::value));

    };

};



template <typename T>

struct is_pointer_impl

    : is_pointer_select<

          ::boost::type_traits::ice_or<

              ::boost::is_reference<T>::value

            , ::boost::is_array<T>::value

            >::value

        >::template result_<T>

{

};



BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void,false)

#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS

BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void const,false)

BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void volatile,false)

BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_pointer,void const volatile,false)

#endif



} // namespace detail



BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_pointer,T,::boost::detail::is_pointer_impl<T>::value)



#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION



} // namespace boost



#include <boost/type_traits/detail/bool_trait_undef.hpp>



#endif // BOOST_TT_IS_POINTER_HPP_INCLUDED

