

//  (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_VOLATILE_HPP_INCLUDED

#define BOOST_TT_IS_VOLATILE_HPP_INCLUDED



#include <boost/config.hpp>

#include <boost/detail/workaround.hpp>



#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION

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

#   if BOOST_WORKAROUND(BOOST_MSVC, < 1400)

#       include <boost/type_traits/remove_bounds.hpp>

#   endif

#else

#   include <boost/type_traits/is_reference.hpp>

#   include <boost/type_traits/is_array.hpp>

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

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

#endif



// should be the last #include

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



namespace boost {



#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION



//* is a type T declared volatile - is_volatile<T>

#if BOOST_WORKAROUND(BOOST_MSVC, < 1400)

   BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_volatile,T,::boost::detail::cv_traits_imp<typename boost::remove_bounds<T>::type*>::is_volatile)

#else

   BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_volatile,T,::boost::detail::cv_traits_imp<T*>::is_volatile)

#endif

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



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

// these are illegal specialisations; cv-qualifies applied to

// references have no effect according to [8.3.2p1],

// C++ Builder requires them though as it treats cv-qualified

// references as distinct types...

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

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

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

#endif



#else



namespace detail {



using ::boost::type_traits::yes_type;

using ::boost::type_traits::no_type;



yes_type is_volatile_tester(void const volatile*);

no_type is_volatile_tester(void const*);



template <bool is_ref, bool array>

struct is_volatile_helper

    : ::boost::type_traits::false_result

{

};



template <>

struct is_volatile_helper<false,false>

{

    template <typename T> struct result_

    {

        static T* t;

        BOOST_STATIC_CONSTANT(bool, value = (

            sizeof(detail::yes_type) == sizeof(detail::is_volatile_tester(t))

            ));

    };

};



template <>

struct is_volatile_helper<false,true>

{

    template <typename T> struct result_

    {

        static T t;

        BOOST_STATIC_CONSTANT(bool, value = (

            sizeof(detail::yes_type) == sizeof(detail::is_volatile_tester(&t))

            ));

    };

};



template <typename T>

struct is_volatile_impl

    : is_volatile_helper<

          is_reference<T>::value

        , is_array<T>::value

        >::template result_<T>

{

};



BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_volatile,void,false)

#ifndef BOOST_NO_CV_VOID_SPECIALIZATIONS

BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_volatile,void const,false)

BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_volatile,void volatile,true)

BOOST_TT_AUX_BOOL_TRAIT_IMPL_SPEC1(is_volatile,void const volatile,true)

#endif



} // namespace detail



//* is a type T declared volatile - is_volatile<T>

BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_volatile,T,::boost::detail::is_volatile_impl<T>::value)



#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION



} // namespace boost



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



#endif // BOOST_TT_IS_VOLATILE_HPP_INCLUDED

