sfinae.h

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#ifndef __utl_meta_sfinae_h__
#define __utl_meta_sfinae_h__

#include <utl/core/impl.h>
#include <type_traits>

namespace utl {
namespace meta {

   namespace detail {
//      template <typename... T>
//      struct dev_null { using type = dev_null; };  //< Same as typelist

      template <bool If>  struct when_ { };
      template <>         struct when_<true> { using type = void; };
   }
   template <bool If>
   using when = eval< detail::when_<If> >;

//   //! Well formed only if all of \p Ifs are \c true
//   template <bool ...Ifs>
//   using when_all = detail::dev_null<
//         when<Ifs>...
//   >;



   template <bool If, typename _Tp = void>   using enable_if = std::enable_if<If, _Tp>;

   template<bool If, typename _Tp = void>    using enable_if_t = eval< enable_if<If, _Tp> >;


}}


#endif /* __utl_meta_sfinae_h__ */