useif.h

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#ifndef __utl_meta_useif_h__
#define __utl_meta_useif_h__

#include <utl/core/impl.h>
#include <utl/meta/operations.h>
#include <utl/meta/sfinae.h>

namespace utl {
namespace meta {

   template <typename _T1, typename _T2, typename _Ret =_T1>
   using use_if_same_t = enable_if_t<
      same_<_T1, _T2>::value, _Ret
   >;
   template <typename _T1, typename _T2, typename _Ret =_T1>
   using use_if_not_same_t = enable_if_t<
      !same_<_T1, _T2>::value, _Ret
   >;
   template <typename T1, typename... Ts>
   using use_if_any_t = enable_if_t<
      or_<T1, Ts...>::value, T1
   >;

   template <typename T1, typename... Ts>
   using use_if_all_t = enable_if_t<
      and_<T1, Ts...>::value, T1
   >;

}}


#endif /* __utl_meta_useif_h__ */