operations.h

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#ifndef __utl_meta_operations_h__
#define __utl_meta_operations_h__

#include <utl/core/impl.h>
#include <utl/meta/selection.h>


namespace utl {
namespace meta{


   template <bool B>
   using not_c = bool_<!B>;

   template<typename _Tp>
   using not_ = not_c<_Tp::type::value>;

   namespace detail {
      template<typename...> struct _or_;

      template<>
      struct _or_<> : false_ { };

      template<typename _T1>
      struct _or_<_T1> : _T1 { };

      template<typename _T1, typename _T2>
      struct _or_ <_T1, _T2>
        : if_<_T1, _T1, _T2> { };

      template<typename _T1, typename _T2, typename _T3, typename... _Tn>
      struct _or_<_T1, _T2, _T3, _Tn...>
         : if_<_T1, _T1, _or_<_T2, _T3, _Tn...>> { };
   }

   template <typename... _Ts>
   using or_ = eval<detail::_or_<_Ts...>>;

   namespace detail {
      template<typename...> struct _and_;

      template<>
      struct _and_<>
         : true_ { };

      template<typename _T1>
      struct _and_ <_T1>
         : _T1 { };

      template<typename _T1, typename _T2>
      struct _and_<_T1, _T2>
         : if_<_T1, _T2, _T1> { };

      template<typename _T1, typename _T2, typename _T3, typename... _Tn>
      struct _and_<_T1, _T2, _T3, _Tn...>
         : if_<_T1, _and_<_T2, _T3, _Tn...>, _T1> { };
   }

   template <typename... _Ts>
   using and_ = eval<detail::_and_<_Ts...>>;

   template<typename _T1, typename _T2>
   struct same_ : false_ { };

   template<typename _Tp>
   struct same_ <_Tp, _Tp> : true_ { };

   template<typename _T1, typename _T2>
   using not_same_ = not_<eval<same_<_T1, _T2>>>;

}}




namespace utl {
namespace meta {


   template <typename _Tp>
   using negate = integral_<decltype(-_Tp()), -_Tp()>;
   template <typename _Tp1, typename _Tp2>
   using add = integral_<
                  decltype(_Tp1() + _Tp2()),
                  _Tp1() + _Tp2()
               >;
   template <typename _Tp1, typename _Tp2>
   using mult = integral_<
                   decltype(_Tp2() * _Tp2()),
                   _Tp1() * _Tp2()
                >;
   template <typename _Tp1, typename _Tp2>
   using divide = integral_<
                     decltype(_Tp2() / _Tp2()),
                     _Tp1() / _Tp2()
                  >;
    template <typename _Tp1, typename _Tp2>
    using modulo = integral_<
                      decltype(_Tp1() % _Tp2()),
                      _Tp1() % _Tp2()
                   >;
   template <typename _Tp1, typename _Tp2>
   using sub = add<_Tp1, negate<_Tp2>>;

   template <typename _Tp>
   using inc = add<_Tp, int_<1>>;

   template <typename _Tp>
   using dec = add<_Tp, int_<-1>>;



   template <typename _Tp1, typename _Tp2>   using comp_eq = bool_<_Tp1() == _Tp2()>;
   template <typename _Tp1, typename _Tp2>   using comp_lt = bool_<(_Tp1() < _Tp2())>;

   template <typename _Tp1, typename _Tp2>   using comp_ne = not_<comp_eq<_Tp1, _Tp2>>;
   template <typename _Tp1, typename _Tp2>   using comp_gt = comp_lt <_Tp2, _Tp1>;
   template <typename _Tp1, typename _Tp2>   using comp_le = not_<comp_lt<_Tp2, _Tp1>>;
   template <typename _Tp1, typename _Tp2>   using comp_ge = not_<comp_lt<_Tp1, _Tp2>>;


   template <typename _T>  using bitnot_ = integral_<typename _T::value_type, (typename _T::value_type)(~_T())>;
   template <typename _Tp1, typename _Tp2>
   using bitand_ = integral_<decltype(_Tp1() & _Tp2()), _Tp1() & _Tp2()>;
   template <typename _Tp1, typename _Tp2>
   using bitor_ = integral_<decltype(_Tp1() | _Tp2()), _Tp1() | _Tp2()>;

   template <typename _Tp1, typename _Tp2>
   using bitxor_ = integral_<decltype(_Tp1() ^ _Tp2()), _Tp1() ^ _Tp2()>;
   template <typename _Tp, typename shift>
   using shift_left = integral_<typename _Tp::value_type, (typename _Tp::value_type)(_Tp() << shift())>;
   template <typename _Tp, typename shift>
   using shift_right = integral_<typename _Tp::value_type, (typename _Tp::value_type)(_Tp() >> shift())>;
}}


#endif /* __utl_meta_operations_h__ */