

//  (C) Copyright John Maddock 2005.  

//  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.





#ifndef BOOST_TT_IS_SIGNED_HPP_INCLUDED

#define BOOST_TT_IS_SIGNED_HPP_INCLUDED



#include <boost/type_traits/is_integral.hpp>

#include <boost/type_traits/remove_cv.hpp>

#include <boost/type_traits/is_enum.hpp>

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



// should be the last #include

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



namespace boost {



namespace detail{



#if !(defined(__EDG_VERSION__) && __EDG_VERSION__ <= 238)



template <class T>

struct is_signed_helper

{

   typedef typename remove_cv<T>::type no_cv_t;

   BOOST_STATIC_CONSTANT(bool, value = (static_cast<no_cv_t>(-1) < 0));

};



template <bool integral_type>

struct is_signed_select_helper

{

   template <class T>

   struct rebind

   {

      typedef is_signed_helper<T> type;

   };

};



template <>

struct is_signed_select_helper<false>

{

   template <class T>

   struct rebind

   {

      typedef false_type type;

   };

};



template <class T>

struct is_signed_imp

{

   typedef is_signed_select_helper< 

      ::boost::type_traits::ice_or<

         ::boost::is_integral<T>::value,

         ::boost::is_enum<T>::value>::value 

   > selector;

   typedef typename selector::template rebind<T> binder;

   typedef typename binder::type type;

#if defined(BOOST_MSVC) && (BOOST_MSVC < 1300)

   BOOST_STATIC_CONSTANT(bool, value = is_signed_imp<T>::type::value);

#else

   BOOST_STATIC_CONSTANT(bool, value = type::value);

#endif

};



#else



template <class T> struct is_signed_imp : public false_type{};

template <> struct is_signed_imp<signed char> : public true_type{};

template <> struct is_signed_imp<const signed char> : public true_type{};

template <> struct is_signed_imp<volatile signed char> : public true_type{};

template <> struct is_signed_imp<const volatile signed char> : public true_type{};

template <> struct is_signed_imp<short> : public true_type{};

template <> struct is_signed_imp<const short> : public true_type{};

template <> struct is_signed_imp<volatile short> : public true_type{};

template <> struct is_signed_imp<const volatile short> : public true_type{};

template <> struct is_signed_imp<int> : public true_type{};

template <> struct is_signed_imp<const int> : public true_type{};

template <> struct is_signed_imp<volatile int> : public true_type{};

template <> struct is_signed_imp<const volatile int> : public true_type{};

template <> struct is_signed_imp<long> : public true_type{};

template <> struct is_signed_imp<const long> : public true_type{};

template <> struct is_signed_imp<volatile long> : public true_type{};

template <> struct is_signed_imp<const volatile long> : public true_type{};

#ifdef BOOST_HAS_LONG_LONG

template <> struct is_signed_imp<long long> : public true_type{};

template <> struct is_signed_imp<const long long> : public true_type{};

template <> struct is_signed_imp<volatile long long> : public true_type{};

template <> struct is_signed_imp<const volatile long long> : public true_type{};

#endif

#if defined(CHAR_MIN) && (CHAR_MIN != 0)

template <> struct is_signed_imp<char> : public true_type{};

template <> struct is_signed_imp<const char> : public true_type{};

template <> struct is_signed_imp<volatile char> : public true_type{};

template <> struct is_signed_imp<const volatile char> : public true_type{};

#endif

#if defined(WCHAR_MIN) && (WCHAR_MIN != 0)

template <> struct is_signed_imp<wchar_t> : public true_type{};

template <> struct is_signed_imp<const wchar_t> : public true_type{};

template <> struct is_signed_imp<volatile wchar_t> : public true_type{};

template <> struct is_signed_imp<const volatile wchar_t> : public true_type{};

#endif



#endif



}



BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_signed,T,::boost::detail::is_signed_imp<T>::value)



} // namespace boost



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



#endif // BOOST_TT_IS_MEMBER_FUNCTION_POINTER_HPP_INCLUDED

